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DR.Rudrashis Samal
            JUNIOR RESIDENT
P. G. Department of Medicine
DEFINITION


    Motor neuron disease (MND) refers to a heterogeneous
    group of conditions characterized by degeneration of lower
    motor neurons (those that have cell bodies in the cranial
    nerve nuclei or in the anterior horn of the spinal cord and
    synapse directly on muscle) and/or upper motor neurons
    (those that have cell bodies in the brain and synapse on
    lower motor neurons). [1]




1. ROWLAND LP , SCHNEIDER N : Amyotrophic lateral sclerosis . New. Engl J. Med. ( 2002) 344 ( 22 ) : 1691 - 1700
SPECTRUM OF MOTOR NEURON DISEASE

Amyotrophic lateral sclerosis (ALS) is one of multiple
degenerative motor neuron diseases that are clinically defined,
based on the involvement of upper and/or lower motor neurons

 ALS is the most common form and includes upper motor neuron
(UMN) and lower motor neuron (LMN) pathology
 Primary   Lateral sclerosis

 Hereditary   spastic paraplegia

 HTLV-1   associated myelopathy

 Adrenomyeloneuropathy


 Lathyrism
 Poliomyelitis
 MultifocalMotor Neuropathy
 Benign Focal Amyotrophy
 Hopkins’ syndrome: Acute post-asthmatic
  amyotrophy
 Spinal Muscular Atrophy
 Bulbo-Spinal Muscular Atrophy (BSMA;
  Kennedy's Syndrome; X-linked)
 Primary Muscular Atrophy (PMA)
ALS PLUS syndrome

ALS is considered a degenerative disorder of the upper and lower
motor neurons.

However, some patients have all of the clinical features of ALS along
with features of other disorders such as

• Frontotemporal dementia

• Autonomic insufficiency

• Parkinsonism, supranuclear gaze paresis and/or sensory loss.

Such patients are considered to have ALS plus syndrome
Also known as LOU GEHRIG’S DISEASE



Degeneration of UMN and LMN
1869 - First described in publication by Dr. Jean-Martin Charcot, in Paris

1881 - Lectures translated into English
A-myo-trophic Lateral Sclerosis

                  Amyotrophic: no muscle
                  nourishment

                  Lateral: refers to the the
                  areas in a person's spinal
                  cord where portions of the
                  nerve cells that signal and
                  control the muscles are
                  located

                  Sclerosis: scarring of the
                  affected nerves
INCIDENCE AND PREVALENCE
•Incidence rates for ALS in Europe and North America range
between 1.5 and 2.7 per 100,000/year.[2]

•Prevalence rates range between 2.7 and 7.4 per 100,000 [2] .

•Incidence of ALS may be lower among African, Asian, and
Hispanic ethnic groups than among Caucasians [3].

•The male to female ratio is about 1.3 to 1.5 for sporadic ALS,
although the ratio becomes closer to unity in the age group
over 70 years.

• ALS is most commonly sporadic. Genetic or familial ALS
represents only 10 percent of all ALS

• In the United States, about 7000 new cases of ALS are
diagnosed each year motor neuron disorder;a review of recent studies.j neuro sci 2001;191.
2. Worms, pm .the epidemiology of
3. Cronin s, hardiman o,traynor BJ ethnic variation in the incidence of als ; a systemic review.neurology 2007;68;1002.
GEOGRAPHIC CLUSTERS
High prevalence clusters of ALS are found in three regions of
the western Pacific including Guam, West New Guinea, and
the Kii Peninsula in Japan. The first cluster described was
found in the indigenous people of Guam [5] .

 The frequent association of ALS with parkinsonism and
Alzheimer disease in this population has led to the designation
of this entity as the amyotrophic lateral sclerosis-parkinsonism
dementia complex (ALS-PDC)

 Neurotoxicity was mediated by the local dietary consumption
of Cycad (Cycas circinalis) . Cycad is rich in beta-N-
methylamino-L-alanine (BMAA), an excitatory amino acid .


5-Kurland, LT, Mulder, DW. Epidemiologic investigations of amyotrophic lateral sclerosis. I. Preliminary report on geographic
distribution, with special reference to the Mariana Islands, including clinical and pathologic observations. Neurology 1954; 4:355
RISK FACTORS
  •The only established risk factors for ALS are age and family
  history.

  •Increased risk for developing ALS has been suggested for
  cigarette smokers, labourers engaged in agricultural work,
  factory work, heavy manual labour, exposure to welding or
  soldering, and work in the plastics industry .

  •Repetitive muscle use, athleticism, playing professional
  soccer, trauma, and electrical shock have also been
  proposed as risk factors.

  •A large case-control study found no association between
  physical activity and the risk of developing ALS, but did find
  that increased leisure time physical activity was associated
  with a younger age of onset in patients with ALS [4].

4- Physical activity and the association with sporadic ALS. AU - Veldink JH; Kalmijn S; Groeneveld GJ; Titulaer MJ; Wokke JH; van
den Berg LH SO - Neurology 2005 Jan 25;64(2):241-5.
GENERAL: HEREDITARY VS SPORADIC ALS

                                       Sporadic
                      Hereditary ALS
Feature                                ALS

Males:Females         1:1              1.7:1

Onset

 Age distribution     More younger     More older


 Mean age             46 years         56 to 63 years


 Juvenile             ALS 2, 4, 5      Rare

 Bulbar features      20% to 30%       Unusual

Involvement of Legs   Common           Occasional
INDIAN SCENARIO
The classical motor neuron disease seen in India is similar to
that in the west in the clinical picture and frequency of
occurrence. However, the onset of the illness is about a
decade earlier and the proportion of patients below the age of
30 is considerably high.

In addition to these forms of motor neuron disease in the
young, two specific types have been identified. Single limb
involvement variously described as

•Juvenile muscular atrophy of upper extremity

•Monomelic amyotrophy

•Wasted leg syndrome

•Benign focal amyotrophy.
The second type, the Madras pattern of motor neuron
disease was first described by Meenakshisundaram et al
from South India in 1970.

Essential features-
• sensorineural deafness
• Involvement of lower cranial nerve nuclei.
• Persistent asymmetry in the distribution of weakness.

There was no positive family history, all being sporadic in
occurrence

A characteristic biochemical finding of persistently low
citrate and elevated pyruvate level has been described in
patients with MMND.
PATHOLOGY
•ALS is characterized by motor neuron degeneration and death
with gliosis replacing lost neurons.

•Cortical motor cells (pyramidal and Betz cells) disappear
leading to retrograde axonal loss and gliosis in the
corticospinal tract.

• This gliosis results in the bilateral white matter changes
sometimes seen in the brain magnetic resonance imaging (MRI)
of patients with ALS.

• The spinal cord becomes atrophic. The ventral roots become
thin, and there is a loss of large myelinated fibers in motor
nerves.

• The affected muscles show denervation atrophy.
•Intracellular inclusions — Intracellular inclusions in
Degenerating neurons and glia are frequent neuropathological
findings of ALS.

Bunina bodies are unique to ALS and consist of eosinophilic
aggregates that are positive for cystatin C, a cysteine protease
inhibitor.

• Ubiquinated inclusions are seen in ALS .

TDP-43 protein — The TAR DNA binding protein 43 (TDP-43) has
been identified as a major component of ubiquinated inclusions
in sporadic ALS.
PATHOGENESIS
GENETICS OF ALS
TOXIC MECHANISMS IN ALS
SOD1-MEDIATED TOXICITY
• Superoxide dismutase type 1 (SOD1) is a metalloenzyme that
catalyzes the conversion of toxic superoxide radicals to
oxygen (O2) and hydrogen peroxide (H2O2).

• Mutations in the SOD1 gene are associated with some cases
of familial ALS suggested that free radical toxicity may play a
role in the process of neuronal cell death or apoptosis [6] .

• SOD1 mutations have been found in 0.7 to 4% patients with
"sporadic" ALS [6] .


• SOD1 has pro-oxidant as well as anti-oxidant activity, and
mutated SOD1 could lead to oxidative injury by an increase
in pro-oxidant pathways, including generation of hydroxyl
radicals and nitration of tyrosine.

6-ANDERSEN PM : Amyotrophic lateral sclerosis associated with mutations in the CuZn superoxide dismutase gene.
Curr. Neurol. Neurosci. Rep. ( 2006 ) 6 ( 1 ) : 37 - 46 .
THE MITOCHONDRION AS A TARGET OF MUTANT SOD1




Mitochondrial
Permeability
  Transition
                                  Translocator Outer
                                      Membrane
                                       Complex
Protein misfolding — Another hypothesis is that mutant
SOD1 induces protein aggregates that are potentially toxic to
motor neurons [7].

Microglial activation                           — Microglia are immune-modulating
cells of the CNS.
Their presence was observed in ALS tissue .

•Once activated, microglia elaborate a host of factors, including
nitric oxide, oxygen radicals, glutamate, and others that may
play roles in part of the cascade leading to motor neuron cell
death .

•Mutant SOD1 appears to increase the production of damaging
reactive oxygen species by activated microglia , thereby
accelerating motor neuron injury [8] .
7-WANG J , XU G , SLUNT HH : Coincident thresholds of mutant protein for paralytic disease and protein aggregation
caused by restrictively expressed superoxide dismutase cDNA. Neurobiol. Dis. ( 2005 ) 20 :943 - 952
8-MOISSE K , STRONG M : Innate immunity in amyotrophic lateral sclerosis. Biochimica et Biophysica Acta ( 2006 )
1762: 1083 - 1093
Excitotoxicity — The excitotoxicity hypothesis postulates
 that excessive levels of the excitatory neurotransmitter
 glutamate may initiate a cascade resulting in cellular death
 of motor neurons in ALS.[9].

  Excessive activation of glutamate receptors may lead to
 increased entry of calcium into cells. In turn, intracellular
 calcium may trigger a cascade of events that causes
 neuronal cell death via

 • Lipid peroxidation

 • Nucleic acid damage

 • and mitochondrial disruption.



9-VAN DEN BOSCH L , VAN DAMME P , BOGAERT E , ROBBERECHT W : The role of excitotoxicity in the pathogenesis
of amyotrophic lateral sclerosis. biochimica et Biophysica Acta ( 2006 ) 1762: 1068 - 1082
Cytoskeletal and axonal transport defect

•Deranged neurofilaments could disrupt axonal transport and
Cause axonal strangulation .

•Mutations in the neurofilament gene peripherin have been
found in sporadic and familial forms of ALS.

•Inhibition of axonal transport may be a cause of motor neuron
degeneration.

•Defects in the dynein-dynactin complex, a molecular motor
responsible for axonal transport along microtubules, have been
linked with motor degeneration.[10]

10-BOILLEE S , VANDE VELDE C , CLEVELAND D : ALS: a disease of motor neurons and their nonneuronal neighbors .
Neuron ( 2006 ) 52 :39 - 59 .
Mitochondrial dysfunction
The cause of the mitochondrial dysfunction is accumulation of
aggregated proteins (such as mSOD1) within the mitochondria
where
• they may clog protein translocation machinery.

• tie up antiapoptotic proteins such as Bcl-2 [11] .


Dysfunctional mitochondria may result in
.
•Impaired calcium buffering within neurons.
•Impaired energy production
•Spillage of reactive oxygen species into the cytoplasm.
•Release of cytohome C into the cytoplasm, which may
activate the apoptosis cascade
11-MANFREDI G , BEAL M : Mitochondrial dysfunction and energy metabolism in amyotrophic lateral sclerosis.In:
Amyotrophic Lateral Sclerosis.Brown RH, Swash M, Pasinelli P (Eds) ,Informa Healthcare, London, UK( 2006 ); 323-
331
Apoptosis

Apoptosis or programmed cell death cascades have been
implicated in several studies .
These reports have shown a number of the hallmarks of
apoptosis including

•DNA fragmentation

•caspase activation

•altered expression of the antiapoptotic protein Bcl-2 [16]




16-LI M , ONA VO , GUEGAN C et al. : Functional role of caspase 1 and 3 in ALS. Science ( 2000 ) 288 :335 - 339
CLINICAL FEATURES:
LOWER MOTOR SYMPTOMS

 Loss of muscle strength
 Atrophy
 Fasciculations
 Muscle cramps
 Difficulty in chewing, swallowing & movement of
  face and tongue
CLINICAL FEATURES:
UPPER MOTOR SYMPTOMS
 Loss of dexterity
 Slowed movements
 Loss of muscle strength
 Stiffness
 Emotional lability
DIAGNOSIS OF ALS
• No biological marker has been identified yet.

• Series of clinical and neurological exams.

• MRI

• Myelogram of cervical spine (an x-ray analysis that allows
the detection of lesions in selected area of the spinal cord)

• Muscle and/or nerve biopsy

• Electromyography (EMG) and nerve conduction velocity
(NCV) to measure muscle response to nervous stimulation.
EL ESCORIAL DIAGNOSTIC CRITERIA
   Other Motor Neuron Diseases                      Neurodegenerative Diseases
       Primary lateral sclerosis (UMN only)             Parkinson’s, Progressive Supranuclear
                                                          Palsy, Multiple sclerosis.
       Progressive muscular atrophy (LMN only)
       Progressive bulbar palsy
                                                     Malignancy
                                                         Primary/metastasis to CNS
   Structural lesions                                   Motor neuron syndromes with MM,
       cervical spondylosis                              Lymphoma, lung, breast.

       parasaggital/foramen magnum tumor
       spinal cord AV malformation                  Toxic Exposure
                                                         alcohol, heavy metals.
   Neuropathies
        CIDP
    
                                                     Endocrine
                                                         hyperthyroidism
   Myopathies                                           hyperparathyroidism.
       PM, inclusion body myositis
                                                     Infectious
                                                         HIV, CMV
   NM Junction
       Myasthenia gravis
Riluzole
Riluzole — Three separate mechanisms of riluzole are thought
to reduce glutamate-induced excitotoxicity:

• inhibition of glutamic acid release

• noncompetitive block of NMDA receptor mediated responses

• direct action on the voltage-dependent sodium channel

Dose and side effects — The recommended dose of Riluzole is
100 mg per day.
Recommendations
The American Academy of Neurology has issued a practice
advisory on the treatment of ALS with Riluzole.

Patients most likely to benefit from treatment include those
who have:

• Definite or probable ALS by El-Escorial criteria , in whom other
causes of progressive muscle atrophy have been ruled out

• Symptoms present for less than five years

• Vital capacity (VC) greater than 60 percent of predicted

• No tracheostomy
SIDE EFFECTS
Very Common
Asthenia.
Nausea.

Common

Alterations in liver function tests.
Headache.
Abdominal pain.
Pain.
Vomiting.
Dizziness.
Tachycardia.
Somnolence.
Oral Paraesthesia.

Uncommon

Anaemia.
Anaphylactoid reaction.
Neutropenia.
Angioedema.
Pancreatitis
CONTRAINDICATIONS
•Hepatic disease or baseline transaminases greater than 3 times the
upper limit of normal or raised bilirubin.

•Pregnancy and breastfeeding
MONITORING
•Regular hepatic function blood tests (baseline then every month for 3
months, then every 3 months for a further 9 months and annually thereafter)
are recommended to monitor tolerability.

• ALT levels should be measured more frequently in patients who develop
elevated ALT levels >2x upper limit of normal.

• If patient presents with febrile illness then monitoring white blood cell
count for neutropenia is strongly recommended.

STOP TREATMENT IF
• Liver function tests – ALT greater than 5 times the upper limit of normal .

• Blood disorders - absolute neutrophil count less than 500/mm3 .
Ceftriaxone

  •A cephalosporin antibiotic.

  •It increases expression of EAAT2/GLT1 and prolongs
  survival in MND patients.

  •Has good brain penetration and has a good short-
  term safety record.

  •However, intravenous administration is required.



13-ROTHSTEIN JD, PATEL S, REGAN MR et al. : β-lactam antibiotics offer neuroprotection by
increasing glutamate transporter expression. Nature ( 2005 ) 433: 73 - 77 .
•IV ceftriaxone, 4 gm/day, four sequential days weekly in early 2004.

•Patient improvement was rapidly evident.


•Objective muscle strength was significantly improved and muscle
atrophy was visibly diminishing.

•After 12 weeks of assistance was no longer required for mobility, and
squats became possible for the first time since presentation.




•Ceftriaxone cessation after 12 weeks resulted in partial return of
signs and symptoms typical of als but with improvement on re-
infusion.
Edavarone

Has multiple ALS-relevant                             mechanisms              of      action,
including
• free radical scavenging.

• blocking the mitochondrial                               transition          pore        and
upregulating bcl-2 expression.

• there was a suggestion of slowed disease progression as
measured by the ALS Functional Rating Scale .[14]




14-YOSHINO H , KIMURA A :Investigation of the therapeutic effects of edaravone, a free radical
scavenger, on amyotrophic lateral sclerosis. Amyotroph. Lateral Scler. ( 2006 ) 7 :241 - 245
• 20 subjects with ALS received either 30 mg (5 ) or 60 mg (15) of
edaravone via intravenous drip once per day.



•Two weeks of administration was followed by a two-week
observation period. This four-week cycle was repeated six times.




•There was the change in the revised ALS functional rating scale
(ALSFRS-R) score.[14]
Tamoxifen

• Used to treat breast cancer.

• Acts as an anti-inflammatory through inhibition of PKC. In a
Phase II study of patients with ALS, it was safe and well
tolerated; furthermore, there was a suggestion of efficacy
with increased survival at certain dosages [18] .

•Tamoxifen has been extensively used in humans and has a
good safety profile.




18-TRAYNOR BJ , BRUIJN L , CONWIT F et al. : Neuroprotective agents for clinical trials in ALS: a systematic
assessment. Neurology ( 2006 ) 67 :20 - 27 .
•Two-year study of 60 people with (ALS)who took varying dosages of
tamoxifen.




•Participants who took more than 20 milligrams a day had a better
survival rate than those who took fewer than 10 milligrams a day.




•After two years, 27 out of 37 (73 percent) of the participants in the
high-dose tamoxifen group had survived, while only 11 of 23 (48
percent) of those in the low-dose groups were still living.
Arimoclomol
  •Heat shock proteins are involved in protein repair, and
  thus are cytoprotective.

  •Motor neurons appear to have a high threshold for
  activation of the heat shock protein pathway, and
  mutant SOD1 may contribute to reduced anti-apoptotic
  capability.


  •Treatment with Arimoclomol, a co-inducer of heat
  shock proteins, delayed disease progression and
  improved survival.[19]


19. CUDKOWICZ M , SHEFNER M , SIMPSON E et al. : A multicenter, dose ranking safety and
pharmacokinetic study of arimoclomol in ALS. Amyotrophic Lateral Sclerosis ( 2006 ) 7 ( S1 ) : 113
Lithium
•An antiapoptotic agent that promotes autophagy , and
may therefore have neuroprotective effects.

• An open-label ALS clinical trial compared 16 patients
treated with Riluzole plus Lithium to 28 patients treated
with Riluzole alone [20] .

• At the end of the 15 month follow-up period, all
patients in the Lithium group were alive, while mortality
in the Riluzole monotherapy group was 29 percent.

• In addition, disease progression, as measured by
Functional Rating Scales and pulmonary function was
slower in patients, treated with lithium.
20-Lithium induces autophagy by inhibiting inositol monophosphatase. AU - Sarkar S; Floto RA; Berger Z; Imarisio S;
Cordenier A; Pasco M; Cook LJ; Rubinsztein DCSO - J Cell Biol. 2005 Sep 26;170(7):1101-11
Stem cells
There are a number of ways in which stem cells could be
beneficial in ALS. These include
•Replacement of dying motor neurons.

•Replacement of defective glial cells.

•Sources of growth factor production.

•‘sinks’ for excitotoxins such as glutamate.
Even more recently, eight patients with ALS were given
intrathecal injections of autologous mesenchymal stem cells,
along with intravenous erythropoietin.

Transient benefits on strength, and a trend toward a reduced
slope of decline in ALS Functional Rating Scale was reported.
15. BRUIJN L , CUDKOWICZ M :Therapeutic targets for amyotrophic lateral sclerosis: current treatments
and prospects for more effective therapies expert rev.neorotherapeutics(2006) 6(3): 417-428.
17. KIM S , KIM H , KOH S et al. :Effectiveness of recombinant human erythropoietin therapy in
amyotrophic lateral sclerosis. Amyotroph. Lateral Scler. ( 2006 ) 7 ( S1 ) : 9.
ANTISENSE OLIGONUCLEOTIDE
•Another approach to gene therapy employs antisense
oligonucleotides

•To downregulate or silence mutant genes.

•The antisense strategy targets specific RNA sequences by
constructing complementary oligonucleotides that bind to the
native mRNA sequences and reduce their translation and
subsequent protein expression.

•In a preliminary study, continuous intraventricular infusion of
antisense oligonucleotides to SOD1 reduced both SOD1 protein
and mRNA levels.

•This treatment significantly slowed disease progression when
initiated near disease onset.
12. SMITH RA , MILLER TM ,YAMANAKA K et al. : Antisense oligonucleotide therapy for
neurodegenerative disease. J. Clin.Invest. ( 2006 ) 116 ( 8 ) : 290 - 2297 .
COMPOUNDS            ALS Research Stage MECHANISM


Co-enzyme q10        Phase II          Antioxidant.
                                       Facilitates
                                       mitochondrial
                                       respiration.

Creatinine.          Phase II          Antioxidant.
                                       Facilitates
                                       mitochondrial
                                       respiration.

Glatirmer acetate.   Phase II          Evokes
                                       neuroprotective
                                       T.cell response.

Minocycline.         Phase III         Prevents microglial
                                       activation.
                                       Prevents caspase
                                       activation.
Dex-pramipexole      Phase II          Antioxidant.
 Spasticity
  Baclofen 5 to 10 mg twice daily to three
   times daily.
  Tizanidine 2 to 4 mg by mouth twice
   daily up to a total dose of 24 mg daily.
  Memantine starting at 5 mg daily,
   increasing by 5 mg a week to a
   maximum of 20 mg twice a day.
  Tetrazepam 50 mg at bedtime,
   increasing by 25 mg a day to a maximum
   dose of 150 mg taken two to three times
   a day.
 Non-pharmacologic     management
    Suction machine (not usually helpful for thick
     mucus, but helpful with sialorrhea)
    Mechanical insufflation-exsufflation (In-
     Exsufflator cough machine)
    Manually assisted coughing techniques
 Also  known as: pseudobulbar palsy,
  emotional incontinence, pathologic
  crying/laughing
 The emotional lability is NOT a mood
  disorder, but is an uncontrolled outburst
  and is a very troubling symptom for
  patients.
 It is an abnormal affective display that
  can be seen in about 50% of ALS patients.
 Amitriptyline 100-150mg QHS
 Fluvoxamine 100-200mg QD
 Alternatively may try Lithium or L-Dopa
 Speech  therapy often helpful early
 Computer technology offer many options to
  assist with patient communication
 Urinary   frequency/urgency
    In the absence of UTI, often due to spasticity that
     responds well to Oxybutinin
 Peripheral   edema
    Often dependent: elevation, massage, compression
     hose (r/o DVOT)
 Laryngospasm
    Sudden reflex closure of vocal cords due to variety of
     stimuli, usually resolves spontaneously
    H1 and H2 blocking agents may be helpful
 Steven Hawking
 Proved Einstein's Theory
  of Relativity
 He currently uses an
  electric wheelchair to
  get around
 A computerized voice
  synthesizer operated by
  facial muscles in order
  to speak
1. ROWLAND LP , SCHNEIDER N : Amyotrophic lateral sclerosis . New. Engl J. Med. ( 2002) 344 ( 22 ) : 1691 – 1700

2. Worms, pm .the epidemiology of motor neuron disorder;a review of recent studies.j neuro sci 2001;191.

3. Cronin s, hardiman o,traynor BJ ethnic variation in the incidence of als ; a systemic review.neurology
   2007;68;1002.
4- Physical activity and the association with sporadic ALS. AU - Veldink JH; Kalmijn S; Groeneveld GJ; Titulaer MJ;
Wokke JH; van den Berg LH SO - Neurology 2005 Jan 25;64(2):241-5.

5-Kurland, LT, Mulder, DW. Epidemiologic investigations of amyotrophic lateral sclerosis. I. Preliminary report
on geographic distribution, with special reference to the Mariana Islands, including clinical and pathologic
observations. Neurology 1954; 4:355

6-ANDERSEN PM : Amyotrophic lateral sclerosis associated with mutations in the CuZn superoxide dismutase gene.
Curr. Neurol. Neurosci. Rep. ( 2006 ) 6 ( 1 ) : 37 - 46 .

7-WANG J , XU G , SLUNT HH : Coincident thresholds of mutant protein for paralytic disease and protein aggregation
caused by restrictively expressed superoxide dismutase cDNA. Neurobiol. Dis. ( 2005 ) 20 :943 - 952


8-MOISSE K , STRONG M : Innate immunity in amyotrophic lateral sclerosis. Biochimica et Biophysica Acta ( 2006 )
1762: 1083 - 1093


9-VAN DEN BOSCH L , VAN DAMME P , BOGAERT E , ROBBERECHT W : The role of excitotoxicity in the pathogenesis
of amyotrophic lateral sclerosis. biochimica et Biophysica Acta ( 2006 ) 1762: 1068 - 1082


10-BOILLEE S , VANDE VELDE C , CLEVELAND D : ALS: a disease of motor neurons and their nonneuronal neighbors .
Neuron ( 2006 ) 52 :39 - 59 .

11-MANFREDI G , BEAL M : Mitochondrial dysfunction and energy metabolism in amyotrophic lateral sclerosis.In:
Amyotrophic Lateral Sclerosis.Brown RH, Swash M, Pasinelli P (Eds) ,Informa Healthcare, London, UK( 2006 ); 323-
331
12. SMITH RA , MILLER TM ,YAMANAKA K et al. : Antisense oligonucleotide therapy for
neurodegenerative disease. J. Clin.Invest. ( 2006 ) 116 ( 8 ) : 290 - 2297 .

13-ROTHSTEIN JD, PATEL S, REGAN MR et al. : β-lactam antibiotics offer neuroprotection by
increasing glutamate transporter expression. Nature ( 2005 ) 433: 73 - 77 .

14-YOSHINO H , KIMURA A :Investigation of the therapeutic effects of edaravone, a free radical
scavenger, on amyotrophic lateral sclerosis. Amyotroph. Lateral Scler. ( 2006 ) 7 :241 - 245

15. BRUIJN L , CUDKOWICZ M :Therapeutic targets for amyotrophic lateral sclerosis: current treatments
and prospects for more effective therapies expert rev.neorotherapeutics(2006) 6(3): 417-428.
16-LI M , ONA VO , GUEGAN C et al. : Functional role of caspase 1 and 3 in ALS. Science ( 2000 ) 288 :335 - 339

17. KIM S , KIM H , KOH S et al. :Effectiveness of recombinant human erythropoietin therapy in
amyotrophic lateral sclerosis. Amyotroph. Lateral Scler. ( 2006 ) 7 ( S1 ) : 9.

18-TRAYNOR BJ , BRUIJN L , CONWIT F et al. : Neuroprotective agents for clinical trials in ALS: a systematic
assessment. Neurology ( 2006 ) 67 :20 - 27 .


19. CUDKOWICZ M , SHEFNER M , SIMPSON E et al. : A multicenter, dose ranking safety and
pharmacokinetic study of arimoclomol in ALS. Amyotrophic Lateral Sclerosis ( 2006 ) 7 ( S1 ) : 113
20-Lithium induces autophagy by inhibiting inositol monophosphatase. AU - Sarkar S; Floto RA; Berger Z; Imarisio S;
Cordenier A; Pasco M; Cook LJ; Rubinsztein DCSO - J Cell Biol. 2005 Sep 26;170(7):1101-11

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Motor neuron disease

  • 1. DR.Rudrashis Samal JUNIOR RESIDENT P. G. Department of Medicine
  • 2. DEFINITION  Motor neuron disease (MND) refers to a heterogeneous group of conditions characterized by degeneration of lower motor neurons (those that have cell bodies in the cranial nerve nuclei or in the anterior horn of the spinal cord and synapse directly on muscle) and/or upper motor neurons (those that have cell bodies in the brain and synapse on lower motor neurons). [1] 1. ROWLAND LP , SCHNEIDER N : Amyotrophic lateral sclerosis . New. Engl J. Med. ( 2002) 344 ( 22 ) : 1691 - 1700
  • 3. SPECTRUM OF MOTOR NEURON DISEASE Amyotrophic lateral sclerosis (ALS) is one of multiple degenerative motor neuron diseases that are clinically defined, based on the involvement of upper and/or lower motor neurons ALS is the most common form and includes upper motor neuron (UMN) and lower motor neuron (LMN) pathology
  • 4.  Primary Lateral sclerosis  Hereditary spastic paraplegia  HTLV-1 associated myelopathy  Adrenomyeloneuropathy  Lathyrism
  • 5.  Poliomyelitis  MultifocalMotor Neuropathy  Benign Focal Amyotrophy  Hopkins’ syndrome: Acute post-asthmatic amyotrophy  Spinal Muscular Atrophy  Bulbo-Spinal Muscular Atrophy (BSMA; Kennedy's Syndrome; X-linked)  Primary Muscular Atrophy (PMA)
  • 6. ALS PLUS syndrome ALS is considered a degenerative disorder of the upper and lower motor neurons. However, some patients have all of the clinical features of ALS along with features of other disorders such as • Frontotemporal dementia • Autonomic insufficiency • Parkinsonism, supranuclear gaze paresis and/or sensory loss. Such patients are considered to have ALS plus syndrome
  • 7. Also known as LOU GEHRIG’S DISEASE Degeneration of UMN and LMN
  • 8. 1869 - First described in publication by Dr. Jean-Martin Charcot, in Paris 1881 - Lectures translated into English
  • 9. A-myo-trophic Lateral Sclerosis Amyotrophic: no muscle nourishment Lateral: refers to the the areas in a person's spinal cord where portions of the nerve cells that signal and control the muscles are located Sclerosis: scarring of the affected nerves
  • 10. INCIDENCE AND PREVALENCE •Incidence rates for ALS in Europe and North America range between 1.5 and 2.7 per 100,000/year.[2] •Prevalence rates range between 2.7 and 7.4 per 100,000 [2] . •Incidence of ALS may be lower among African, Asian, and Hispanic ethnic groups than among Caucasians [3]. •The male to female ratio is about 1.3 to 1.5 for sporadic ALS, although the ratio becomes closer to unity in the age group over 70 years. • ALS is most commonly sporadic. Genetic or familial ALS represents only 10 percent of all ALS • In the United States, about 7000 new cases of ALS are diagnosed each year motor neuron disorder;a review of recent studies.j neuro sci 2001;191. 2. Worms, pm .the epidemiology of 3. Cronin s, hardiman o,traynor BJ ethnic variation in the incidence of als ; a systemic review.neurology 2007;68;1002.
  • 11. GEOGRAPHIC CLUSTERS High prevalence clusters of ALS are found in three regions of the western Pacific including Guam, West New Guinea, and the Kii Peninsula in Japan. The first cluster described was found in the indigenous people of Guam [5] . The frequent association of ALS with parkinsonism and Alzheimer disease in this population has led to the designation of this entity as the amyotrophic lateral sclerosis-parkinsonism dementia complex (ALS-PDC) Neurotoxicity was mediated by the local dietary consumption of Cycad (Cycas circinalis) . Cycad is rich in beta-N- methylamino-L-alanine (BMAA), an excitatory amino acid . 5-Kurland, LT, Mulder, DW. Epidemiologic investigations of amyotrophic lateral sclerosis. I. Preliminary report on geographic distribution, with special reference to the Mariana Islands, including clinical and pathologic observations. Neurology 1954; 4:355
  • 12. RISK FACTORS •The only established risk factors for ALS are age and family history. •Increased risk for developing ALS has been suggested for cigarette smokers, labourers engaged in agricultural work, factory work, heavy manual labour, exposure to welding or soldering, and work in the plastics industry . •Repetitive muscle use, athleticism, playing professional soccer, trauma, and electrical shock have also been proposed as risk factors. •A large case-control study found no association between physical activity and the risk of developing ALS, but did find that increased leisure time physical activity was associated with a younger age of onset in patients with ALS [4]. 4- Physical activity and the association with sporadic ALS. AU - Veldink JH; Kalmijn S; Groeneveld GJ; Titulaer MJ; Wokke JH; van den Berg LH SO - Neurology 2005 Jan 25;64(2):241-5.
  • 13. GENERAL: HEREDITARY VS SPORADIC ALS Sporadic Hereditary ALS Feature ALS Males:Females 1:1 1.7:1 Onset Age distribution More younger More older Mean age 46 years 56 to 63 years Juvenile ALS 2, 4, 5 Rare Bulbar features 20% to 30% Unusual Involvement of Legs Common Occasional
  • 14. INDIAN SCENARIO The classical motor neuron disease seen in India is similar to that in the west in the clinical picture and frequency of occurrence. However, the onset of the illness is about a decade earlier and the proportion of patients below the age of 30 is considerably high. In addition to these forms of motor neuron disease in the young, two specific types have been identified. Single limb involvement variously described as •Juvenile muscular atrophy of upper extremity •Monomelic amyotrophy •Wasted leg syndrome •Benign focal amyotrophy.
  • 15. The second type, the Madras pattern of motor neuron disease was first described by Meenakshisundaram et al from South India in 1970. Essential features- • sensorineural deafness • Involvement of lower cranial nerve nuclei. • Persistent asymmetry in the distribution of weakness. There was no positive family history, all being sporadic in occurrence A characteristic biochemical finding of persistently low citrate and elevated pyruvate level has been described in patients with MMND.
  • 16. PATHOLOGY •ALS is characterized by motor neuron degeneration and death with gliosis replacing lost neurons. •Cortical motor cells (pyramidal and Betz cells) disappear leading to retrograde axonal loss and gliosis in the corticospinal tract. • This gliosis results in the bilateral white matter changes sometimes seen in the brain magnetic resonance imaging (MRI) of patients with ALS. • The spinal cord becomes atrophic. The ventral roots become thin, and there is a loss of large myelinated fibers in motor nerves. • The affected muscles show denervation atrophy.
  • 17. •Intracellular inclusions — Intracellular inclusions in Degenerating neurons and glia are frequent neuropathological findings of ALS. Bunina bodies are unique to ALS and consist of eosinophilic aggregates that are positive for cystatin C, a cysteine protease inhibitor. • Ubiquinated inclusions are seen in ALS . TDP-43 protein — The TAR DNA binding protein 43 (TDP-43) has been identified as a major component of ubiquinated inclusions in sporadic ALS.
  • 21. SOD1-MEDIATED TOXICITY • Superoxide dismutase type 1 (SOD1) is a metalloenzyme that catalyzes the conversion of toxic superoxide radicals to oxygen (O2) and hydrogen peroxide (H2O2). • Mutations in the SOD1 gene are associated with some cases of familial ALS suggested that free radical toxicity may play a role in the process of neuronal cell death or apoptosis [6] . • SOD1 mutations have been found in 0.7 to 4% patients with "sporadic" ALS [6] . • SOD1 has pro-oxidant as well as anti-oxidant activity, and mutated SOD1 could lead to oxidative injury by an increase in pro-oxidant pathways, including generation of hydroxyl radicals and nitration of tyrosine. 6-ANDERSEN PM : Amyotrophic lateral sclerosis associated with mutations in the CuZn superoxide dismutase gene. Curr. Neurol. Neurosci. Rep. ( 2006 ) 6 ( 1 ) : 37 - 46 .
  • 22. THE MITOCHONDRION AS A TARGET OF MUTANT SOD1 Mitochondrial Permeability Transition Translocator Outer Membrane Complex
  • 23. Protein misfolding — Another hypothesis is that mutant SOD1 induces protein aggregates that are potentially toxic to motor neurons [7]. Microglial activation — Microglia are immune-modulating cells of the CNS. Their presence was observed in ALS tissue . •Once activated, microglia elaborate a host of factors, including nitric oxide, oxygen radicals, glutamate, and others that may play roles in part of the cascade leading to motor neuron cell death . •Mutant SOD1 appears to increase the production of damaging reactive oxygen species by activated microglia , thereby accelerating motor neuron injury [8] . 7-WANG J , XU G , SLUNT HH : Coincident thresholds of mutant protein for paralytic disease and protein aggregation caused by restrictively expressed superoxide dismutase cDNA. Neurobiol. Dis. ( 2005 ) 20 :943 - 952 8-MOISSE K , STRONG M : Innate immunity in amyotrophic lateral sclerosis. Biochimica et Biophysica Acta ( 2006 ) 1762: 1083 - 1093
  • 24. Excitotoxicity — The excitotoxicity hypothesis postulates that excessive levels of the excitatory neurotransmitter glutamate may initiate a cascade resulting in cellular death of motor neurons in ALS.[9]. Excessive activation of glutamate receptors may lead to increased entry of calcium into cells. In turn, intracellular calcium may trigger a cascade of events that causes neuronal cell death via • Lipid peroxidation • Nucleic acid damage • and mitochondrial disruption. 9-VAN DEN BOSCH L , VAN DAMME P , BOGAERT E , ROBBERECHT W : The role of excitotoxicity in the pathogenesis of amyotrophic lateral sclerosis. biochimica et Biophysica Acta ( 2006 ) 1762: 1068 - 1082
  • 25. Cytoskeletal and axonal transport defect •Deranged neurofilaments could disrupt axonal transport and Cause axonal strangulation . •Mutations in the neurofilament gene peripherin have been found in sporadic and familial forms of ALS. •Inhibition of axonal transport may be a cause of motor neuron degeneration. •Defects in the dynein-dynactin complex, a molecular motor responsible for axonal transport along microtubules, have been linked with motor degeneration.[10] 10-BOILLEE S , VANDE VELDE C , CLEVELAND D : ALS: a disease of motor neurons and their nonneuronal neighbors . Neuron ( 2006 ) 52 :39 - 59 .
  • 26. Mitochondrial dysfunction The cause of the mitochondrial dysfunction is accumulation of aggregated proteins (such as mSOD1) within the mitochondria where • they may clog protein translocation machinery. • tie up antiapoptotic proteins such as Bcl-2 [11] . Dysfunctional mitochondria may result in . •Impaired calcium buffering within neurons. •Impaired energy production •Spillage of reactive oxygen species into the cytoplasm. •Release of cytohome C into the cytoplasm, which may activate the apoptosis cascade 11-MANFREDI G , BEAL M : Mitochondrial dysfunction and energy metabolism in amyotrophic lateral sclerosis.In: Amyotrophic Lateral Sclerosis.Brown RH, Swash M, Pasinelli P (Eds) ,Informa Healthcare, London, UK( 2006 ); 323- 331
  • 27. Apoptosis Apoptosis or programmed cell death cascades have been implicated in several studies . These reports have shown a number of the hallmarks of apoptosis including •DNA fragmentation •caspase activation •altered expression of the antiapoptotic protein Bcl-2 [16] 16-LI M , ONA VO , GUEGAN C et al. : Functional role of caspase 1 and 3 in ALS. Science ( 2000 ) 288 :335 - 339
  • 28. CLINICAL FEATURES: LOWER MOTOR SYMPTOMS  Loss of muscle strength  Atrophy  Fasciculations  Muscle cramps  Difficulty in chewing, swallowing & movement of face and tongue
  • 29. CLINICAL FEATURES: UPPER MOTOR SYMPTOMS  Loss of dexterity  Slowed movements  Loss of muscle strength  Stiffness  Emotional lability
  • 30.
  • 31. DIAGNOSIS OF ALS • No biological marker has been identified yet. • Series of clinical and neurological exams. • MRI • Myelogram of cervical spine (an x-ray analysis that allows the detection of lesions in selected area of the spinal cord) • Muscle and/or nerve biopsy • Electromyography (EMG) and nerve conduction velocity (NCV) to measure muscle response to nervous stimulation.
  • 33. Other Motor Neuron Diseases  Neurodegenerative Diseases  Primary lateral sclerosis (UMN only)  Parkinson’s, Progressive Supranuclear Palsy, Multiple sclerosis.  Progressive muscular atrophy (LMN only)  Progressive bulbar palsy  Malignancy  Primary/metastasis to CNS  Structural lesions  Motor neuron syndromes with MM,  cervical spondylosis Lymphoma, lung, breast.  parasaggital/foramen magnum tumor  spinal cord AV malformation  Toxic Exposure  alcohol, heavy metals.  Neuropathies CIDP   Endocrine  hyperthyroidism  Myopathies  hyperparathyroidism.  PM, inclusion body myositis  Infectious  HIV, CMV  NM Junction  Myasthenia gravis
  • 34.
  • 35. Riluzole Riluzole — Three separate mechanisms of riluzole are thought to reduce glutamate-induced excitotoxicity: • inhibition of glutamic acid release • noncompetitive block of NMDA receptor mediated responses • direct action on the voltage-dependent sodium channel Dose and side effects — The recommended dose of Riluzole is 100 mg per day.
  • 36. Recommendations The American Academy of Neurology has issued a practice advisory on the treatment of ALS with Riluzole. Patients most likely to benefit from treatment include those who have: • Definite or probable ALS by El-Escorial criteria , in whom other causes of progressive muscle atrophy have been ruled out • Symptoms present for less than five years • Vital capacity (VC) greater than 60 percent of predicted • No tracheostomy
  • 37. SIDE EFFECTS Very Common Asthenia. Nausea. Common Alterations in liver function tests. Headache. Abdominal pain. Pain. Vomiting. Dizziness. Tachycardia. Somnolence. Oral Paraesthesia. Uncommon Anaemia. Anaphylactoid reaction. Neutropenia. Angioedema. Pancreatitis
  • 38. CONTRAINDICATIONS •Hepatic disease or baseline transaminases greater than 3 times the upper limit of normal or raised bilirubin. •Pregnancy and breastfeeding MONITORING •Regular hepatic function blood tests (baseline then every month for 3 months, then every 3 months for a further 9 months and annually thereafter) are recommended to monitor tolerability. • ALT levels should be measured more frequently in patients who develop elevated ALT levels >2x upper limit of normal. • If patient presents with febrile illness then monitoring white blood cell count for neutropenia is strongly recommended. STOP TREATMENT IF • Liver function tests – ALT greater than 5 times the upper limit of normal . • Blood disorders - absolute neutrophil count less than 500/mm3 .
  • 39. Ceftriaxone •A cephalosporin antibiotic. •It increases expression of EAAT2/GLT1 and prolongs survival in MND patients. •Has good brain penetration and has a good short- term safety record. •However, intravenous administration is required. 13-ROTHSTEIN JD, PATEL S, REGAN MR et al. : β-lactam antibiotics offer neuroprotection by increasing glutamate transporter expression. Nature ( 2005 ) 433: 73 - 77 .
  • 40. •IV ceftriaxone, 4 gm/day, four sequential days weekly in early 2004. •Patient improvement was rapidly evident. •Objective muscle strength was significantly improved and muscle atrophy was visibly diminishing. •After 12 weeks of assistance was no longer required for mobility, and squats became possible for the first time since presentation. •Ceftriaxone cessation after 12 weeks resulted in partial return of signs and symptoms typical of als but with improvement on re- infusion.
  • 41. Edavarone Has multiple ALS-relevant mechanisms of action, including • free radical scavenging. • blocking the mitochondrial transition pore and upregulating bcl-2 expression. • there was a suggestion of slowed disease progression as measured by the ALS Functional Rating Scale .[14] 14-YOSHINO H , KIMURA A :Investigation of the therapeutic effects of edaravone, a free radical scavenger, on amyotrophic lateral sclerosis. Amyotroph. Lateral Scler. ( 2006 ) 7 :241 - 245
  • 42. • 20 subjects with ALS received either 30 mg (5 ) or 60 mg (15) of edaravone via intravenous drip once per day. •Two weeks of administration was followed by a two-week observation period. This four-week cycle was repeated six times. •There was the change in the revised ALS functional rating scale (ALSFRS-R) score.[14]
  • 43. Tamoxifen • Used to treat breast cancer. • Acts as an anti-inflammatory through inhibition of PKC. In a Phase II study of patients with ALS, it was safe and well tolerated; furthermore, there was a suggestion of efficacy with increased survival at certain dosages [18] . •Tamoxifen has been extensively used in humans and has a good safety profile. 18-TRAYNOR BJ , BRUIJN L , CONWIT F et al. : Neuroprotective agents for clinical trials in ALS: a systematic assessment. Neurology ( 2006 ) 67 :20 - 27 .
  • 44. •Two-year study of 60 people with (ALS)who took varying dosages of tamoxifen. •Participants who took more than 20 milligrams a day had a better survival rate than those who took fewer than 10 milligrams a day. •After two years, 27 out of 37 (73 percent) of the participants in the high-dose tamoxifen group had survived, while only 11 of 23 (48 percent) of those in the low-dose groups were still living.
  • 45. Arimoclomol •Heat shock proteins are involved in protein repair, and thus are cytoprotective. •Motor neurons appear to have a high threshold for activation of the heat shock protein pathway, and mutant SOD1 may contribute to reduced anti-apoptotic capability. •Treatment with Arimoclomol, a co-inducer of heat shock proteins, delayed disease progression and improved survival.[19] 19. CUDKOWICZ M , SHEFNER M , SIMPSON E et al. : A multicenter, dose ranking safety and pharmacokinetic study of arimoclomol in ALS. Amyotrophic Lateral Sclerosis ( 2006 ) 7 ( S1 ) : 113
  • 46. Lithium •An antiapoptotic agent that promotes autophagy , and may therefore have neuroprotective effects. • An open-label ALS clinical trial compared 16 patients treated with Riluzole plus Lithium to 28 patients treated with Riluzole alone [20] . • At the end of the 15 month follow-up period, all patients in the Lithium group were alive, while mortality in the Riluzole monotherapy group was 29 percent. • In addition, disease progression, as measured by Functional Rating Scales and pulmonary function was slower in patients, treated with lithium. 20-Lithium induces autophagy by inhibiting inositol monophosphatase. AU - Sarkar S; Floto RA; Berger Z; Imarisio S; Cordenier A; Pasco M; Cook LJ; Rubinsztein DCSO - J Cell Biol. 2005 Sep 26;170(7):1101-11
  • 47. Stem cells There are a number of ways in which stem cells could be beneficial in ALS. These include •Replacement of dying motor neurons. •Replacement of defective glial cells. •Sources of growth factor production. •‘sinks’ for excitotoxins such as glutamate. Even more recently, eight patients with ALS were given intrathecal injections of autologous mesenchymal stem cells, along with intravenous erythropoietin. Transient benefits on strength, and a trend toward a reduced slope of decline in ALS Functional Rating Scale was reported. 15. BRUIJN L , CUDKOWICZ M :Therapeutic targets for amyotrophic lateral sclerosis: current treatments and prospects for more effective therapies expert rev.neorotherapeutics(2006) 6(3): 417-428. 17. KIM S , KIM H , KOH S et al. :Effectiveness of recombinant human erythropoietin therapy in amyotrophic lateral sclerosis. Amyotroph. Lateral Scler. ( 2006 ) 7 ( S1 ) : 9.
  • 48. ANTISENSE OLIGONUCLEOTIDE •Another approach to gene therapy employs antisense oligonucleotides •To downregulate or silence mutant genes. •The antisense strategy targets specific RNA sequences by constructing complementary oligonucleotides that bind to the native mRNA sequences and reduce their translation and subsequent protein expression. •In a preliminary study, continuous intraventricular infusion of antisense oligonucleotides to SOD1 reduced both SOD1 protein and mRNA levels. •This treatment significantly slowed disease progression when initiated near disease onset. 12. SMITH RA , MILLER TM ,YAMANAKA K et al. : Antisense oligonucleotide therapy for neurodegenerative disease. J. Clin.Invest. ( 2006 ) 116 ( 8 ) : 290 - 2297 .
  • 49. COMPOUNDS ALS Research Stage MECHANISM Co-enzyme q10 Phase II Antioxidant. Facilitates mitochondrial respiration. Creatinine. Phase II Antioxidant. Facilitates mitochondrial respiration. Glatirmer acetate. Phase II Evokes neuroprotective T.cell response. Minocycline. Phase III Prevents microglial activation. Prevents caspase activation. Dex-pramipexole Phase II Antioxidant.
  • 50.
  • 51.  Spasticity  Baclofen 5 to 10 mg twice daily to three times daily.  Tizanidine 2 to 4 mg by mouth twice daily up to a total dose of 24 mg daily.  Memantine starting at 5 mg daily, increasing by 5 mg a week to a maximum of 20 mg twice a day.  Tetrazepam 50 mg at bedtime, increasing by 25 mg a day to a maximum dose of 150 mg taken two to three times a day.
  • 52.
  • 53.  Non-pharmacologic management  Suction machine (not usually helpful for thick mucus, but helpful with sialorrhea)  Mechanical insufflation-exsufflation (In- Exsufflator cough machine)  Manually assisted coughing techniques
  • 54.
  • 55.
  • 56.  Also known as: pseudobulbar palsy, emotional incontinence, pathologic crying/laughing  The emotional lability is NOT a mood disorder, but is an uncontrolled outburst and is a very troubling symptom for patients.  It is an abnormal affective display that can be seen in about 50% of ALS patients.
  • 57.  Amitriptyline 100-150mg QHS  Fluvoxamine 100-200mg QD  Alternatively may try Lithium or L-Dopa
  • 58.  Speech therapy often helpful early  Computer technology offer many options to assist with patient communication
  • 59.  Urinary frequency/urgency  In the absence of UTI, often due to spasticity that responds well to Oxybutinin  Peripheral edema  Often dependent: elevation, massage, compression hose (r/o DVOT)  Laryngospasm  Sudden reflex closure of vocal cords due to variety of stimuli, usually resolves spontaneously  H1 and H2 blocking agents may be helpful
  • 60.  Steven Hawking  Proved Einstein's Theory of Relativity  He currently uses an electric wheelchair to get around  A computerized voice synthesizer operated by facial muscles in order to speak
  • 61. 1. ROWLAND LP , SCHNEIDER N : Amyotrophic lateral sclerosis . New. Engl J. Med. ( 2002) 344 ( 22 ) : 1691 – 1700 2. Worms, pm .the epidemiology of motor neuron disorder;a review of recent studies.j neuro sci 2001;191. 3. Cronin s, hardiman o,traynor BJ ethnic variation in the incidence of als ; a systemic review.neurology 2007;68;1002. 4- Physical activity and the association with sporadic ALS. AU - Veldink JH; Kalmijn S; Groeneveld GJ; Titulaer MJ; Wokke JH; van den Berg LH SO - Neurology 2005 Jan 25;64(2):241-5. 5-Kurland, LT, Mulder, DW. Epidemiologic investigations of amyotrophic lateral sclerosis. I. Preliminary report on geographic distribution, with special reference to the Mariana Islands, including clinical and pathologic observations. Neurology 1954; 4:355 6-ANDERSEN PM : Amyotrophic lateral sclerosis associated with mutations in the CuZn superoxide dismutase gene. Curr. Neurol. Neurosci. Rep. ( 2006 ) 6 ( 1 ) : 37 - 46 . 7-WANG J , XU G , SLUNT HH : Coincident thresholds of mutant protein for paralytic disease and protein aggregation caused by restrictively expressed superoxide dismutase cDNA. Neurobiol. Dis. ( 2005 ) 20 :943 - 952 8-MOISSE K , STRONG M : Innate immunity in amyotrophic lateral sclerosis. Biochimica et Biophysica Acta ( 2006 ) 1762: 1083 - 1093 9-VAN DEN BOSCH L , VAN DAMME P , BOGAERT E , ROBBERECHT W : The role of excitotoxicity in the pathogenesis of amyotrophic lateral sclerosis. biochimica et Biophysica Acta ( 2006 ) 1762: 1068 - 1082 10-BOILLEE S , VANDE VELDE C , CLEVELAND D : ALS: a disease of motor neurons and their nonneuronal neighbors . Neuron ( 2006 ) 52 :39 - 59 . 11-MANFREDI G , BEAL M : Mitochondrial dysfunction and energy metabolism in amyotrophic lateral sclerosis.In: Amyotrophic Lateral Sclerosis.Brown RH, Swash M, Pasinelli P (Eds) ,Informa Healthcare, London, UK( 2006 ); 323- 331
  • 62. 12. SMITH RA , MILLER TM ,YAMANAKA K et al. : Antisense oligonucleotide therapy for neurodegenerative disease. J. Clin.Invest. ( 2006 ) 116 ( 8 ) : 290 - 2297 . 13-ROTHSTEIN JD, PATEL S, REGAN MR et al. : β-lactam antibiotics offer neuroprotection by increasing glutamate transporter expression. Nature ( 2005 ) 433: 73 - 77 . 14-YOSHINO H , KIMURA A :Investigation of the therapeutic effects of edaravone, a free radical scavenger, on amyotrophic lateral sclerosis. Amyotroph. Lateral Scler. ( 2006 ) 7 :241 - 245 15. BRUIJN L , CUDKOWICZ M :Therapeutic targets for amyotrophic lateral sclerosis: current treatments and prospects for more effective therapies expert rev.neorotherapeutics(2006) 6(3): 417-428. 16-LI M , ONA VO , GUEGAN C et al. : Functional role of caspase 1 and 3 in ALS. Science ( 2000 ) 288 :335 - 339 17. KIM S , KIM H , KOH S et al. :Effectiveness of recombinant human erythropoietin therapy in amyotrophic lateral sclerosis. Amyotroph. Lateral Scler. ( 2006 ) 7 ( S1 ) : 9. 18-TRAYNOR BJ , BRUIJN L , CONWIT F et al. : Neuroprotective agents for clinical trials in ALS: a systematic assessment. Neurology ( 2006 ) 67 :20 - 27 . 19. CUDKOWICZ M , SHEFNER M , SIMPSON E et al. : A multicenter, dose ranking safety and pharmacokinetic study of arimoclomol in ALS. Amyotrophic Lateral Sclerosis ( 2006 ) 7 ( S1 ) : 113 20-Lithium induces autophagy by inhibiting inositol monophosphatase. AU - Sarkar S; Floto RA; Berger Z; Imarisio S; Cordenier A; Pasco M; Cook LJ; Rubinsztein DCSO - J Cell Biol. 2005 Sep 26;170(7):1101-11