parkinson’s disease. parkinson's disease belongs to a group of conditions called movement...
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Parkinson’s Disease
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Parkinson's disease belongs to a group of conditions called movement disorders.
Commons symptoms of Parkinson’s disease include:
Tremors, starting in the hands.
Slowed motion (bradykinesia).
Rigid muscles.
Impaired (stooped) posture and balance.
Loss of automatic movements.
Speech changes.
Dementia.
What is Parkinson’s Disease?
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Statistical Analysis
“Emerging Trends.” Menopausal Health. American Nurses Association. 2001. Web. 27 Oct. 2010.
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Statistical Analysis
Van Den Eeden, Stephen K., and Tanner, Caroline M. “Incidence of Parkinson’s Disease: Variation by Age, Gender, and Race/Ethnicity.” American Journal of Epidemiology. Volume157, Issue11, Pp. 1015-1022. (2003). Web. 27 Oct. 2010.
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Dopamine: Happy Juice
Dopamine = catecholamine neurotransmitter
Dopamine is also a neurohormone released by the hypothalamus.
Dopamine is available as an intravenous medication acting on the sympathetic nervous system, producing effects such as increased heart rate and blood pressure.
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Production of Dopamine
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Connections between low norepinephrine levels and dopamine levels
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Connections between low norepinephrine levels and dopamine levels1. Dopamine is a precursor to both Catecholamines,
Norepinephrine and Epinephrine.
2. Dopamine + Dopamine Beta Hydroxylase & Vitamin C -> Norepinephrine
3. Norepinephrine + Phenylethanolamine N-Methyltransferase & S-Adenosyl Methionine with Cortisol -> Epinephrine
DBH
PNMT
Vit. C
Dopamine
Norepinephrine Cortisol SAMe
Epinephrine
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Connections between low norepinephrine levels and dopamine levels
Dopamine + Dopamine Beta Hydroxylase (DBH) & Vitamin C -> Norepinephrine
DBHDopamine
Vitamin C
Norepinephrine
Vitamin C is a required cofactor to assist DBH.
DBH is one of a few membrane bound enzymes. Norepinephrine and epinephrine are synthesized in a vesicle.
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Connections between low norepinephrine levels and dopamine levels
Norepinephrine + Phenylethanolamine N Methyltransferase (PNMT) & S-Adenosyl Methionine (SAMe) with Cortisol -> Epinephrine
PNMT
SAMe
Cortisol
Norepinephrine Epinephrine
Phenylethanolamine N Methyltransferase converts Norepinephrine (NE) to Epinephrine (Epi) SAMe is a required cofactor in the reaction and
Cortisol positively assists PNMT in this conversion
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Dopamine-Motor Control
-Lack of Dopamine => Loss of motor activity
Norepinephrine/Epinephrine-Excitatory Neurotransmitters / Hormones
-Increase heart rate-Increase fight or flight response-Increase awareness and alertness
Connections between low norepinephrine levels and dopamine levels
Why do we care about low levels of norepinephrine?
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Norepinephrine (NE)
Released in the body as a Hormone and Neurotransmitter
Hormone functions:
Released by the adrenal medulla along with epinephrine
Released by the brain during a time of stress (i.e. “fight-or-flight”
Levels increase during exercise to cause increase in many different bodily functions
Transported along the same pathway as dopamine
Vasoconstriction
Neurotransmitter functions:
Released by the Autonomic Nervous System (ANS)
Released by most sympathetic postganglionic axons
Adrenergic receptors (α and β) bind to NE that target organs respond to
Can have excitatory or inhibitory effects
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Relation to Parkinson’s Disease
Disease effects nerve endings, which produce NE as a neurotransmitter
One study found degeneration of nerve endings in brain that released NE which caused a decrease in BP when patient goes to stand up (NINDS, 2010)
It also found that out of the 29 patients tested, ALL showed a decreased number of NE releasing nerve endings in the heart (NINDS, 2010)
Loss of NE causes a loss of sympathetic nerve terminals in the heart
These NE neurons modulate the dopamine release substantia nigra neurons (Michael J Fox Foundation)
Without NE, the dopaminergic cells produce dopamine but can’t release it causing the symptoms of Parkinson’s (Michael J Fox Foundation)
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Lewy Body
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History and Research
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Alpha-Synuclein
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Lewy Body Formation
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Effect of PD on motor activity
Motor circuitBasal ganglia
Primary motor cortex
Deterioration of dopamine producing neurons
Decreased amount of dopamine
Increased activity of basal ganglia
Image: Obeso et al
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Effect of PD on motor activity
Images: WM Commons, Mikael Häggström
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Effect of PD on motor activity
Overactivity of basal ganglia leads to the motor symptoms of the disease
Persistent tremor at rest
Forward-bent walking posture
Shuffling gait
Stiff facial expression
Dyskinesia
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Treatment Methods for Parkinson’s Disease
Alter Dopamine LevelsDopamine levels can be increased by using L-Dopa (levodopa in drug terms)(Medications).
The levodopa is combined with carbidopa or benzerazide to allow transport to the brain (Medications).
The L-Dopa will then be converted to dopamine
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Treatment Methods
Problems with L-Dopa TreatmentL-Dopa can still be converted to Dopamine outside the brain.
Due to COMT (Catechol-o-methyltransferase) enzyme.
There are two forms, one is in the brain and the other is in the liver, kidneys, and blood (COMT).
COMT inhibitors are used to increase levodopa that gets to the brain.
Side effects include involuntary movements, nightmares, hallucinations, and changes in blood pressure (David)
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Dopamine AgonistsMolecules that stimulate dopamine receptors (Medications).
Pramipexole dihydrochloride
Ropinirole Hydrochloride
Bromocriptine
Pergolide
Treatment Methods
Dopamine
Figure Source: www.chemexper.com
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Treatment Methods
Deep Brain ShockingTiny electrodes (aka neurostimulator) placed in the basal ganglia
This area is stimulated to block involuntary movements and tremors (NINDS).
Not a cure, but suppresses symptoms
http://www.youtube.com/watch?v=KDjWdtDyz5I
Source: biomed.brown.edu
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Treatment Methods
Lewy BodiesTreatment typically includes using a neuroleptic to reduce the symptoms of hallucinations and depression (Jocelyn).
Neuroleptics are tranquilizers
Tranquilizers suppress the CNS.
Counteracts Parkinsons medications
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Treatment Methods
Non-Medicinal TechniquesRelieving stress helps healing process (David)
Make daily tasks more simple
Physical therapy
Occupational therapy
Adding handicap features in the house
Small clothing changes
Support Groups
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Treatment Methods
Further ResearchNeed to find a way to eliminate lewy bodies without suppressing CNS.
Perhaps ways to reconstruct damaged brain cells using stem cells (Current Research).
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Citations
Online Medical Library. Aug 2007. Web. 27 Oct 2010. Dopamine and Agonists Figures. ChemExperChemical Directory. www.chemexper.com. ChemExper Inc. 2010. Web. 27 Oct. 2010. Garrett Reginald and Charles Grisham. Biochemistry. Canada: Brooks/Cole, 2010. Print. Jocelyn, Robert, and Jeanne Segal. Lewy Body Dementia. www.helpguide.org. Helpguide. June 2010. Web. 27 Oct. 2010 Medications Used to Treat Parkinson’s Disease. www.ehealthmd.com. Health Information Publications. 2004. Web. 27 Oct. 2010.NINDS Deep Brain Stimulation for Parkinson’s Disease Information Page. www.ninds.nih.gov. National Institutes of Health. 14 Jun 2010. Web. 27 Oct. 2010.
Neurotransmitter Bios.” Neurorelief. Neuroscience, Inc. n.d. Web. 27 Oct. 2010.Powers, Scott; Howley, Edward. Exercise Physiology: Theory and Application to fitness and performance.
McGraw Hill, 2009. Print.Mosely, A. D. and Romaine, D. S. 2010. The Encyclopedia of Parkinson’s Disease. USA: Hermitage Publishing. Polymeropoulos, M. H. et al. 1997. Mutation in the α-synuclein gene indentified in families with Parkinson’s disease. Science 276: 2045-2047. Baba, M. et al. 1998. Aggregation of α-synuclein in Lewy Bodies of sporadic Parkinson’s disease and dementia with Lewy Bodies. Amer. J. Path. 152: 879-884.Lippa, C. F. et al. 1998. Lewy Bodies contain altered α-synuclein in brains of many familial Alzheimer’s disease patients with mutations in presenilin and amyloid precursor protein genes. Amer. J. Path. 153: 1365-1370.
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Citations Continued
“Emerging Trends.” Menopausal Health. American Nurses Association. 2001. Web. 27 Oct. 2010.
Polymeropoulos Mihael H., and Lavedan Christian. “Mutation in the -Synuclein Gene Identified in Families with Parkinson's Disease.” Science. 27 June 1997: Vol. 276. no. 5321, pp. 2045 - 20471 May 2009.
DOI: 10.1126/science.276.5321.2045. 27 Oct. 2010
Medications Used to Treat Parkinson’s Disease. www.ehealthmd.com. Health Information Publications. 2004. Web. 27 Oct. 2010.
COMT. http://ghr.nlm.nih.gov. Genetics Home Reference. Sept 2007. Web. 27 Oct. 2010.
Oboeso, J.A. et al. "Functional Organization of the Basal Ganglia: Therapeutic Implications for Parkinson’s Disease." Movement Disorders. 23. S3 (2008): S548-S559.
Marieb, Elaine N, and Katja Hoenh. Human Anatomy & Physiology. San Francisco, CA: Pearson Education, 2007.
Deep Brain Stimulation Figure. biomed.brown.edu. Brown University. Web. 27 Oct 2010. COMT. http://ghr.nlm.nih.gov. Genetics Home Reference. Sept 2007. Web. 27 Oct. 2010. David Eidelberg M.D. and Michael Pourfar M.D. Parkinson’s Disease. www.merck.com. Merck Manuals.
Ebadi, M. S. 2005. Parkinson’s Disease. USA: CRC Press.
Olanow, C. W., Perl, D. P., DeMartino, G. N., and McNaught, K. P. 2004. Lewy-body formation is an aggresome-related process: a hypothesis. Lan. Neur. 3: 496-503.