Abstract
The 5HT-mediated contraction of rat thoracic aorta is competitively blocked by the specific receptor antagonist 5HT 2 ketanserin. In this tissue the addition of 5HT activated the turnover of 3H-phosphatidylinositol in a ketanserin-reversible fashion. These 5HT 2 recognition sites appear to be coupled to a phospholipase C mediated cleavage of phosphatidylinositol.
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