The Latest Research in Parkinson s Disease. Lawrence Elmer, MD, PhD Professor, Dept. of Neurology University of Toledo
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1 The Latest Research in Parkinson s Disease Lawrence Elmer, MD, PhD Professor, Dept. of Neurology University of Toledo
2 OR.. Rethinking Parkinson s Disease Lawrence Elmer, MD, PhD Professor, Dept. of Neurology University of Toledo
3 Earliest areas of Lewy body appearance Olfactory mucosa in contact with air, aerosols, fumes, etc. Not your father s Parkinson s Disease!! Gastrointestinal tract in contact with liquids, solids, medications, toxins, etc. - inhabited by bacteria, fungi, etc.
4 Genetic Discoveries Paved the Way Ghandi and Wood, Human Molecular Genetics, 14:2749 (2005)
5 Radical Hypothesis of Braak and Colleagues Revolutionary PD Pathology H. Braak, et al., Cell Tissue Res (2004) 318:
6 Lewy Body Pathology in the Olfactory Bulb and The Dorsal Motor Nucleus of the Vagus Nerve Nervous system pathology in sporadic Parkinson disease. Braak H, Del Tredici K. Neurology May 13;70(20):
7 Lewy Body Pathology in the Enteric Nervous System Nervous system pathology in sporadic Parkinson disease. Braak H, Del Tredici K. Neurology May 13;70(20):
8 Incidence of NMS in PD Olfactory dysfunction* 90% Dementia 78%. Depression* 40-50% Autonomic nervous system dysfunction 80% Orthostatic hypotension 50% Gastrointestinal symptoms* 50-95% Urogenital dysfunction 57-83% Pain 40-50% Sleep disorders* 66% Impulse control disorders 7-14% Fatigue 50% *Identified as possible premotor symptoms Reichmann H, Ziemssen T. Expert Opin Pharmacother. 2009;10(5): Chaudhuri KR, et al. Lancet Neurol. 2006;5(3):
9 A Timeline for Parkinson's Disease Clinical Manifestations 20-year Prodrome Onset Disease Progression Hyposmia Constipation Bladder dysfunction Sleep disorder Obesity Depression Enteric plexus Olfactory bulb CN X Coeruleus Caudal raphe Magnocellular cf. Unilateral Tremor Rigidity Akinesia Bilateral Poor balance Falls Dependency Bedbound Dementia Cognitive decline Pathological Changes Substantia nigra Amygdala Meynert s nucleus PPN Temporal lobe TEC Ca-2 plexus Intralaminar thalamic nuclei Prefrontal cortex Tertiary sensoryassociated areas CN X, cranial nerve X; PPN, peripeduncular nucleus; TEC, transentorhinal cortex Hawkes CH, et al. Abstract presented at: 61st Annual Meeting of the American Academy of Neurology; April 28, 2009; Seattle, WA. Abstract P
10 Premotor Parkinson s Disease Clinical Manifestations Strongest Evidence (as reviewed by Lang et al. 2011): Olfactory deficits (Hyposmia) Constipation Sleep disorders (RBD, Excessive Daytime Sleepiness) Depression Suggested Links/Investigative: Other autonomic disturbances: Heart rate variability Other mood and behavioral: Anxiety, apathy, personality characteristics Cognitive changes Visual disturbances Restless legs syndrome Fatigue Lang AE. Mov Disord. 2011;26(5):
11 Premotor Parkinson s Disease Clinical Manifestations: Olfaction Olfactory bulb may be earliest site of brain pathology in PD, based on Braak Hypothesis A recent multi-center study of 400 patients with PD found that 74.5% had an olfactory deficit, as measured by the University of Pennsylvania Smell Identification Test (UPSIT) and corrected for age Longitudinal Honolulu-Asia Aging Study showed odds ratio of 5.2 of developing PD among those in the lowest quartile of smell identification, compared to those in the upper quartile Easy and relatively inexpensive to test, but low specificity: Smell deficits also occur with normal aging, smoking, head injury, and other neurodegenerative disease (Alzheimer s disease and PSP) Lang AE. Mov Disord. 2011;26(5):
12 Autonomic Dysfunction Constipation Can predate motor symptoms by 18 years Men with less than one bowel movement per day show a 2.7-fold greater risk of developing PD Lewy bodies have been found postmortem in 12.5% of patients with constipation who were not diagnosed with PD or dementia Altered cardiac sympathetic input Results in loss of heart rate variability Tolosa E, et al. Neurology. 2009;72(7 suppl):s12-s20. Ueki A, Otsuka M. J Neurol. 2004;251(suppl 7):vii18-vii23.
13 Autonomic Dysfunction: Loss of Heart Rate Variability Patients with PD or RBD had lower amounts of sympathetic cardiac terminals as measured by MIBG scintigraphy compared to controls Correlates with changes in cardiac variability Miyamoto T, et al. Neurology. 2006;67(12):
14 Sleep Disorders: REM Behavior Disorder (RBD) and Excessive Daytime Sleepiness (EDS) 20% of PD patients with RBD report that RBD predated diagnosis by several years RBD patients have about a 40% chance of later PD development One report suggests that RBD is predictive of PD only when patients develop PD after the age of 50 RBD is less common in patients with tremor and may predict the development of cognitive decline EDS patients also show a 3-fold greater risk for the development of PD Stephenson R, et al. Mov Disord. 2009;24(suppl 2):S665-S670. Tolosa E, et al. Neurology. 2009;72(suppl 7):S12-S20. Kumru H, et al. Sleep Med. 2007;8(7-8): Iranzo A, et al. Neurology. 2005;65(2): Abbott RD, et al. Neurology. 2005;65(9):
15
16 REM Behavioral Disorder Predicts PD/Dementia Quantifying the risk of neurodegenerative disease in idiopathic REM sleep behavior disorder R.B. Postuma,J.F. Gagnon,M. Vendette,M.L. Fantini,J. Massicotte-Marquez,J.Montplaisir Neurology Apr 14;72(15):
17 Premotor PD and RBD Patients with RBD and no motor abnormality have nonmotor PD features Impaired olfaction Cardiac sympathetic denervation Abnormal dopamine imaging Postuma RB, et al. Brain. 2009;132(Pt 12):
18 PD Incidence PD Incidence/10,000 Person-Years by Number of Symptoms Present For: p=0.007 trend 1/298* * Cases of PD / Subjects at risk -Excessive daytime sleepiness -Poor olfaction -Slow reaction time 10/1151 5/ Number of symptoms 2/27 Courtesy of GW Ross
19 Imaging Evidence of Premotor PD The concept of biomarkers for the premotor phase have been studied using: 18 F-Dopa PET DAT SPECT (esp. 123 I-β-CIT) Cardiac Sympathetic SPECT Imaging (MIBG) [norepinephrine] Transcranial Sonography Magnetic resonance Imaging Other radioligands representing serotonergic and cholinergic function as well as microglial activation (peripheral benzodiazepine receptor targets) and synuclein tracers
20 Imaging Evidence of Premotor PD DAT SPECT Imaging 123 I-β-CIT (Carbomethoxy Iodophenol Tropane) SPECT imaging of the dopamine transport (DAT) system has demonstrated bilateral abnormalities in uptake in patients with hemi-parkinsonism (unilateral motor symptoms) 1 Prospectively followed at-risk individuals have been shown to have abnormally decreased DAT uptake prior to the onset of overt motor symptoms (up to 5 years) 2 1 Marek KL, et al. Neurology. 1996;46(1): Ponsen MM, et al. Ann Neurol. 2004;56(2):
21 What s the Benefit if PD is Diagnosed Early? Exercise is emerging as potentially diseasemodifying Growth factors i.e. gene therapy are available Numerous new molecules potentially modify disease progression
22 Moving from Symptomatic to Disease-Modifying levodopa Parcopa Substantia Nigra Stalevo (carbidopa/levodopa/entacapone) Amantadine selegiline zydis selegiline rasagiline MAO-B Dopamine agonists apomorphine bromocriptine pergolide pramipexole pramipexole ER ropinirole ropinirole XL rotigotine DA BBB carbidopa benserazide tolcapone entacapone GABA ACh Striatum baclofen Anti-cholinergics (Deep Brain Stimulation)
23 Role of Forced Exercise on PD Progression
24 Chronic MPTP Model and Exercise
25 Chronic MPTP Model and Exercise
26 Disease Modification in PD Nature Reviews 10: (2011)
27 Sites of Action of PD Drugs: Emerging Substantia Nigra Serotonergic Antagonists Multifunctional MAO-B Inhibitors MAO-B Dopamine agonists Controlled-release Novel DA s Nasal sprays Other transdermal DA GABA Extended levodopa delivery systems Striatum Adenosine Antagonists AMPA Antagonists Adrenergic Antagonists
28 Multi-functional effects of rasagiline in neurons
29 Improvement Worsening Mean UPDRS change from baseline ADAGIO: Post-Hoc Analysis, Rasagiline 2 mg/day Patients with Baseline UPDRS Scores >25.5 Slope(rasagiline) - slope(placebo) = -0.20, p<0.001; 95% CI: -0.30, Upper quartile curves are divergent Week 72(early-start) - Week 72(delayed-start) = , p=0.04; 95% CI: -7.04, Upper quartile changes are different II III I Slope(early-start) - slope(delayed-start) = -0.03, Week p<0.001; 90% CI: -0.13, 0.06 Delayed-start (placebo rasagiline) Early-start (rasagiline rasagiline) Olanow CW, et al. N Engl J Med. 2009;361: Upper quartile curves are non-convergent
30 Growth Factors in Parkinson s Disease Lancet Neurol 2011; 10:
31 Growth Factors in Parkinson s Disease Lancet Neurol 2011; 10:
32 Growth Factors in Parkinson s Disease Lancet Neurol 2011; 10:
33 A Timeline for Parkinson's Disease Clinical Manifestations 20-year Prodrome Onset Disease Progression Hyposmia Constipation Bladder dysfunction Sleep disorder Obesity Depression Enteric plexus Olfactory bulb CN X Coeruleus Caudal raphe Magnocellular cf. Unilateral Tremor Rigidity Akinesia Bilateral Poor balance Falls Dependency Bedbound Dementia Cognitive decline Pathological Changes Substantia nigra Amygdala Meynert s nucleus PPN Temporal lobe TEC Ca-2 plexus Intralaminar thalamic nuclei Prefrontal cortex Tertiary sensoryassociated areas CN X, cranial nerve X; PPN, peripeduncular nucleus; TEC, transentorhinal cortex Hawkes CH, et al. Abstract presented at: 61st Annual Meeting of the American Academy of Neurology; April 28, 2009; Seattle, WA. Abstract P
34 Summary We are redefining the diagnosis of Parkinson s Disease Overwhelming evidence of a Pre-PD state Multifaceted approaches to therapy are obviously needed With hard work, extreme research and a lot of luck, we may see PD cured in our lifetime
35 Thank you!
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