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Single Cell Measurement of Dopamine Release with Simultaneous Voltage-clamp and Amperometry
Published on: November 21, 2012
Methamphetamine-induced vascular changes lead to striatal hypoxia and dopamine reduction
Sharanya M Kousik1, Steven M Graves, T Celeste Napier
1Department of Pharmacology and the Center for Compulsive Behaviors and Addiction, Rush University, Robert H. and Terri Cohn Research Building, 1735 West Harrison Street, Chicago, IL 60612, USA. sharanya_m_kousik@rush.edu
Neuroreport
|October 8, 2011
Summary
Methamphetamine abuse may increase Parkinson's disease risk by damaging the blood-brain barrier and reducing blood flow to the brain, causing dopamine neuron loss. This neurotoxic mechanism involves hypoxia and striatal vasoconstriction.
Area of Science:
- Neuroscience
- Toxicology
- Neurology
Background:
- Methamphetamine (meth) is a psychostimulant linked to neurotoxicity.
- Clinical observations suggest a correlation between meth abuse and an increased risk of Parkinson's disease.
Purpose of the Study:
- To investigate the potential mechanisms by which methamphetamine abuse may increase the risk of Parkinson's disease.
- To examine changes in the blood-brain barrier and cerebral vasculature following methamphetamine exposure in a rat model.
Main Methods:
- Rats were administered methamphetamine acutely and trained to self-administer the drug.
- Blood-brain barrier integrity was assessed.
- Cerebral blood flow in the striatum was measured using imaging techniques.
- Hypoxia and dopamine-related markers (tyrosine hydroxylase) in the striatum were evaluated.
Main Results:
- Acute methamphetamine treatment led to observable blood-brain barrier leakage.
- Both acute and chronic methamphetamine exposure resulted in hypoperfusion (reduced blood flow) in the striatum.
- Striatal hypoperfusion was associated with hypoxia (oxygen deficiency).
- Methamphetamine self-administration correlated with reduced levels of striatal tyrosine hydroxylase, a marker for dopamine neurons.
Conclusions:
- Methamphetamine-induced neurotoxicity may involve damage to the blood-brain barrier and reduced cerebral blood flow.
- Striatal vasoconstriction leading to hypoxia and subsequent dopamine neuron damage is a potential mechanism linking meth abuse to Parkinson's disease risk.
- These findings highlight a novel pathway for methamphetamine's neurotoxic effects relevant to neurodegenerative disorders.
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