Parkinsonism Tremor –resting Slowness –bradykinesia Stiffness –rigidity Loss of balance.
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Transcript of Parkinsonism Tremor –resting Slowness –bradykinesia Stiffness –rigidity Loss of balance.
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Parkinsonism
• Tremor– resting
• Slowness– bradykinesia
• Stiffness– rigidity
• Loss of balance
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Olanow. Neurology 2009
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Dopa
Dopa Dopamine
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Cause
Dopamine deficit
Dopamine replacement
Tremor, rigidity, bradykinesia, postural impairment
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Golbe 1990
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Parkinson’s – divergent causes, convergent mechanisms (Science
21 May 04)
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Braak 2005
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Cause
Dopamine deficit
Dopamine replacement
Tremor, rigidity, bradykinesia, postural impairment
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Cause Cause Cause Cause Cause
Mechanism
Dopamine deficit Cortical Lewy bodies Other neurotransmitters
Parkinsonism Dementia
DepressionFalls
Autonomic dysfunction
Pain
Levodopa complications
Sleep disturbance
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Dopaminergic
5 years 10 years
Parkinsonism Motor fluctuations and dyskinesia
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Non-Dopaminergic
5 years 10 years
anosmiaRBD
anxiety depression
pain Fallsautonomic failuredementia
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Dopaminergic
Non-Dopaminergic
Diagnosis and early treatment Motor complications General neurodegeneration
5 years 10 years
Parkinsonism Motor fluctuations and dyskinesia
anosmiaRBD
anxiety depression
pain Fallsautonomic failuredementia
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Schwarz 2004
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Hely 2008
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Kempster Brain 2010
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Kempster Brain 2010
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Schenck et al 1986
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REM Sleep behaviour disorder
• 5 patients (4 men)• 6 years of injuring themselves or spouses during
sleep• REM pathology with loss of chin atonia, increased
limb activity• Reaching and searching hand gestures, punches and
kicks• OPCA, GBS, SAH, atypical dementia• Excellent response to clonazepam• Replicates findings from cats with pontine
tegmental lesions
Schenck et al 1986
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RBD clinical features
• Male gender predilection• Mean onset 50–65 years (childhood—80 years)• Vocalizations, swearing, screaming• Simple limb jerks to complex motor behaviour, with
injuries to patient or bedpartner• Dreams often involve chases or attacks by animals or
humans; exhibited behaviours mirror dream content• Behaviors tend to occur in latter half of the sleep period• When associated with neurodegenerative disease, RBD
often precedes dementia and/or parkinsonism by years or decades
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Antonio Carnicero 1779
“…in his right hand he held his unsheathed sword, with which he was slashing about on all sides, uttering exclamations as if he were actually fighting some giant: and the best of it was his eyes were not open, for he was fast asleep, and dreaming that he was doing battle with the giant”.
Cervantes; Don Quixote 1605
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RBD and PD
Schenck et al: • 29 patients with Idopathic-RBD
– 38% developed PD 12.7 yrs post RBD onset– 65% by 7 yrs later
• “Idiopathic” RBD– Olfactory deficits– Loss of striatal DA– impaired attention, executive function, and verbal
memory
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RBD and prognosis of PD
• RBD more common in non-tremulous PD• Seldom occurs when PD develops <50 years• RBD is associated with visual hallucinations
– ?PD psychosis may represent a narcolepsy-like REM sleep disorder
• RBD is associated with worse and more rapidly developing PD– Vendette M, Gagnon J-F, Decary A, et al. REM sleep behavior
disorder predicts cognitive impairment in Parkinson disease without dementia. Neurology 2007; 69:1843-1849.
• RBD tends to wane with PD progression
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The “wait and watch” option
modified from Grosset, D et al. J Neurol Neurosurg Psychiatry 2007;78:465-469
Self-reported health status deteriorated significantly over 18 months in untreated patients but not treated patients
n = 114
n = 61
n = 74n = 127
9/12
9/12
treated
untreated
*
*
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The “wait and watch” option
modified from Asimakopoulos, P et al. J Neurol Neurosurg Psychiatry 2008;79:716-718
n = 16
n = 26
No significant deterioration over 2 years in health status score in either group even though motor status significantly worsened in the untreated group.
“……we believe a ‘‘wait and watch’’ strategy for the treatment of newly diagnosed PD remains a credible approach……..”
Change in Median UPDRS Motor Score
0
10
20
30
treated untreatedUP
DR
S (
Mo
tor)
Sco
re
baseline
year 2
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In summary, it makes sense to treat patients early to improve early quality of life
However, the impact of early treatment on late quality of life has not been assessed
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Does early treatment lead to better later PD status?
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0
10
20
30
40
50
60
Levodopa Ropinirole
<70>70%
dys
kine
sia
Adapted from Rascol 054 Study
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Initial treatment
• Young patients: dyskinesia– Dopamine agonists (ropinirole 3 mg tds)
• Old patients: dementia– Levodopa (100 mg tds)
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RopiniroleAdverse Events (compared to levodopa)
Ropinirole Levodopa
Nausea 48.6% 36.7%
Somnolence 27.4 17.3
Hallucination 17.3 3.3
Edema 14.0 4.0
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Agonists and disinhibition
• Gambling
• Impulsive sexual behaviour
• Shopping
• Eating
• Punding
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Levodopa
Levodopa Dopamine
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Miller. J Neurochem 1999;72:1516
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Dopamine D1 receptor binding in dyskinetic rats
Aubert et al 2005
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Nyholm. Clinical Neuropharmacology 2002;25:89
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Levodopa Enzyme Inhibition
modified from Olanow et al. Neurology 2001;56(11 Suppl 5) S1-88)
carbidopa
selegiline
tolcapone
entacapone
rasagilinerasagiline
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COMT inhibition: Entacapone
• 200mg with each dose of levodopa
• Easy to use
• Minimal diarrhoea 2.5%
• Not as powerful as tolcapone
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COMT inhibition: Tolcapone
• 100-200 mg tds – do not adjust the dose
• Powerful
• More levodopa side effects
• More diarrhoea - 12%
• Need to monitor liver function
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Who needs COMT inhibition?
• the patient with predictable fluctuations who has not responded to increases in dose or frequency of levodopa or slow-release levodopa
• the patient with unpredictable fluctuations. – But keep expectations low - difficult patients
with unpredictable fluctuations will stay difficult to treat
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Apomorphine
• Morphine decomposition product by boiling with concentrated acid
• Occasionally used to enhance erectile function
• Non-selective dopamine agonist
• Suitable for parenteral use
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Apomorphine
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Nyholm. Clinical Neuropharmacology 2002;25:89
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DUODOPA
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Patient 03 Sinemetplasma levodopa
8 9 10 11 12 13 14 15 16 17
0
1
2
3
4
5
6
7
8
BaselineTest day 4Test day 5Test day 6
D D DM M
Time
g/m
l
Patient 03 Duodopaplasma levodopa
8 9 10 11 12 13 14 15 16 17
0
1
2
3
4
5
6
7
8
Test day 1Test day 2Test day 3
M M
Time g
/ml
Plasma Levodopa Concentrations
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Olanow CW et al. (2006) Drug Insight: continuous dopaminergic stimulation in the treatment of Parkinson's disease Nat Clin Pract Neurol 2: 382–392 10.1038/ncpneuro0222
Figure 3 Effect of intraintestinal levodopa infusion on motor complications in Parkinson's disease
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6 Months Follow Up: PDQ-39
PDQ-39(N=12)
0
5
10
15
20
25
30
35
40
Conventional TherapyBaseline
Duodopa Baseline Duodopa 6 months
*
*p<0.01
DIREQT
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Deep Brain Stimulation
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3387S-4X Electrodes 1.5mm apart; over 10.5mm3389S-4X Electrodes 0.5mm apart; over 7.5mmBody of Leads are 1.27mm diam.
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Deuschl NEJM 2006
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Selection of patients for DBS
•Diagnosis of Idiopathic Parkinson’s Disease Certain•On optimum drug treatment•Good L-Dopa “on” response (L-Dopa Challenge~50%)•Major fluctuations and/or dyskinesia•No significant dementia•No important psychiatric disorder or mood disorder•Age is relative contraindication; <70yrs•Hypertension well controlled•Not requiring long-term anticoagulation•No surgical contraindication found on MRI scan•Capable of tolerating the proceedure (takes a number of hours)•Patient well appraised of realistic expected outcome of the proceedure•[ No significant postural instability during best “on” period ]
•L-Dopa resistant symptoms not generally improved
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Microarray Analysis of Choroid Plexus Neurotrophic Genes Expression
Name Expression Index Rank/24000TGFbeta 1 (HIGHEST) 12.6 240
IGF-2 11.8 528
VEGF (confirmed by ELISA) 10.29 2097
EGF 9.04 4947
IGF-1 7.92 8596
FGF-2 6.93 11758
Growth hormone 6.39 13317
BMPs 5.24 16628
Nerve growth factor 4.79 18152
BDNF (confirmed by ELISA) 4.31 19716
FGF-2 6.93 11758
TGFbeta 3 6.76 12272
FGF 5.267 16726
Nerve growth factor 4.79 18152
NT-3 (LOWEST) 3.98 20869
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High Expression Genes
Detoxification Proteins Anti-Oxidant Enzymes Proteinase Inhibitors
TRANSTHYRETIN SOD-1 CYSTATIN B & C(confirmed - proteonomics)
Lipocalin-PGDS SOD-2 (Mn type) Neuroserpin(confirmed - proteonomics)
Retinol Binding Proteins Glutathione peroxidase(intracellular)
Glutathione peroxidase 4
Catalase
Glutathione reductase
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Skinner 2009
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Skinner 2009(calcein)
Rat brain at 6 Months
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porcine endogenous retrovirus (PERV)
• highly prone to recombination events• capable of intracellularly moving within the pig genome as retrotransposons • remote possibility of recombination with human retroviruses, including human endogenous
retroviruses
• Cytomegalovirus• lymphotrophic herpes virus• encephalomyocarditis virus• hepatitis E • circo-viruses
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Released 1807 by Captain Abraham Bristow of the Sarah
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High Health Status Pigs: • US FDA Guidelines 2003• Low copy numbers for PERV• No gene marker for locus required for recombination PERV-C with
PERV-A• No demonstrated transmission of PERV
Molecular Diagnostic Laboratory• International Accreditation New Zealand certified
Manufacturing Plant: • GMP certification annual recertification and audit• Cell Processing• Encapsulation Technology• Toxicity data• Quality Certified Encapsulated Product
Preclinical Data• Safety and efficacy studies in animals:
Monitoring• Safety monitoring for donors and recipients
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Human diabetes - NZ• John Baker, MMH• 14 brittle type I DM• Met US criteria for allograft. Intensive ministerial oversight• Dose escalation and de-escalation
– 10 ilets/kg…20…5• Peritoneal insertion, 20 min procedure• Most patients abdo pain and inflammation• One patient anaphylactoid response 6 days• First 4 patients, now 4 years• No long term AEs• Mild improvement
– 25% less insulin– Fewer hypos– 2 patients regained hypo awareness
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Animal neurological studies
• Rat stroke
• Rat QA HD
• Monkey QA HD
• Rat 6OHD PD
• Monkey MPTP PD
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1.Sheng L, Wang W, Yu XP, Mao J, Rong PF. Establishment of hemi-Parkinsonism model of rhesus induced by MPTP. Chin J Med Imaging Technology 2006; 3: 353-356.
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0 2 4 6 8 10 12 14 16 18 20 22 240
20
40
60
80
100
120CP cell capsulesEmpty capsulesSham*
********* ***
***
Weeks post implant
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Hai Lin*, Wei Wang+, Xian-Ming Luo+, Marilyn S Geaney*, Shaun Wynyard*, Jian Guanx, Robert B Elliott*, Stephen JM Skinner*, Paul L-J Tan. Manuscript in preparation. 2012
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Hai Lin*, Wei Wang+, Xian-Ming Luo+, Marilyn S Geaney*, Shaun Wynyard*, Jian Guanx, Robert B Elliott*, Stephen JM Skinner*, Paul L-J Tan. Manuscript in preparation. 2012
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Pig cells for PDNot much new:• Many transplant studies (well developed assessment protocols)
– Adrenal– Foetal
• Previous Growth factor studies– GDNF
• Patients already accept burr holes and brain probes for DBS
• Sham surgery for PD established• Pig cells used before in PD• LCT encapsulated cells well tolerated in diabetes
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Deep Brain Stimulation
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Auckland Phase I safety Study with efficacy observations
Patients screened and selected for DBS
Offered recruitment to transplant study (n=4)
Unilateral putaminal transplant NT encapsulated cells
Observe 6 months
Excellent response Partial response No response
Keep observing Contralateral transplant DBS
Clinical assessmentVancouver PET
Clinical assessmentVancouver PET