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Aging and endothelin-1 induced vascular contractions
G Weinheimer1, D J Dooley, M Cazzonelli
1Dept. of Pharmacology, Goedecke Research Institute, Freiburg, Federal Republic of Germany.
Experientia
|October 15, 1990
Summary
Aging alters blood vessel responses to endothelin-1. Senescent rats showed reduced sensitivity in aorta and renal arteries but enhanced contraction in mesenteric arteries.
Area of Science:
- Cardiovascular Physiology
- Aging Research
- Pharmacology
Background:
- Endothelin-1 is a potent vasoconstrictor.
- Vascular function can change with aging.
Purpose of the Study:
- To investigate age-related changes in endothelin-1-induced contractions in rat arteries.
- To compare vascular responses in young and senescent Sprague-Dawley rats.
Main Methods:
- Vascular contractions were measured in aorta, renal, and mesenteric arteries from 2- and 24-month-old rats.
- Dose-response curves to endothelin-1 were generated.
Main Results:
- Senescent rats exhibited increased EC50 values for endothelin-1 in aorta and renal arteries, indicating reduced sensitivity.
- Mesenteric arteries in senescent rats showed unchanged EC50 but an enhanced maximal contractile response to endothelin-1.
- No significant age-related difference was found in the maximal endothelin-1 response of aorta and renal arteries.
Conclusions:
- Aging leads to differential changes in endothelin-1 responsiveness across different rat arteries.
- Reduced sensitivity in aorta/renal arteries and enhanced response in mesenteric arteries characterize vascular aging in Sprague-Dawley rats.