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Endothelin, cerebral ischaemia and infarction
J L Reid1, D Dawson, I M Macrae
1Department of Medicine and Therapeutics, University of Glasgow, Scotland.
Clinical and Experimental Hypertension (New York, N.Y. : 1993)
|January 1, 1995
Summary
Endothelin-1 (ET-1), a vasoconstrictor peptide, causes significant reductions in cerebral blood flow and induces focal cerebral ischemia in rats. This new model aids research into neuroprotection strategies for stroke.
Area of Science:
- Neuroscience
- Cardiovascular Physiology
Background:
- Endothelin-1 (ET-1) is a peptide produced by endothelial cells with potent vasoconstrictor effects.
- ET-1 is found in both peripheral and cerebral blood vessels, and in certain brain neurons, suggesting a role in blood pressure regulation.
Purpose of the Study:
- To investigate the effects of ET-1 on cerebral blood flow and blood pressure in conscious rats.
- To establish a novel animal model for reversible focal cerebral ischemia using ET-1.
Main Methods:
- Intracisternal administration of ET-1 in conscious rats to assess pressor response and cerebral blood flow.
- Local application of ET-1 to the middle cerebral artery (MCA) in rats to induce vasoconstriction and cerebral infarction.
Main Results:
- Intracisternal ET-1 caused a significant pressor response and widespread reduction in cerebral blood flow.
- Direct application of ET-1 to the MCA resulted in dose-dependent, reversible vasoconstriction, leading to reduced local cerebral blood flow and cerebral infarction.
Conclusions:
- Abluminal ET-1 application to the rat MCA provides a simple model of reversible focal cerebral ischemia.
- This ET-1-induced ischemia model can be used to study mechanisms of cerebral ischemia/reperfusion injury and test neuroprotective agents.