We observed the effects of angiotensin II (AII) on the contractile response and the Ca2+ transient induced by high K+ solution in the rabbit mesenteric artery. In the control condition, the repented application of high K+ solution with 90 min interval induced a gradually increasing contraction, which was accompanied with a significant elevation of the intracellular calcium concentration ([Ca2+](i)). Treatment of the tissue with AII for one to two hours abolished the incremental response of the contraction. The change in [Ca2+](i) induced by high K+ solution, however, was not significantly different with and without treatment with AII. Pretreatment of the tissue with actinomycin D abolished the inhibitory action of AII on the incremental contraction, indicating the involvement of a transcriptional process. These results indicate that AII impairs vascular contractility through the modulation of Ca2+-sensitivity of the contractile machinery.
|Number of pages||7|
|Journal||Biochemical and Biophysical Research Communications|
|Publication status||Published - May 15 1996|
All Science Journal Classification (ASJC) codes
- Molecular Biology
- Cell Biology