Abstract

Yohimbine and some stereoisomeric alkaloids inhibited the binding of 3H-clonidine and 3H-WB-4101 to rat cerebral cortex membranes. Rauwolscine and yohimbine had much higher affinity to the 3H-clonidine than to the 3H-WB-4101 site, whereas the reverse was true for corynanthine. The results indicate that the 3H-clonidine site is an α 2-adrenoceptor and not an agonist-selective site whereas the 3H-WB-4101 site is an α 1-adrenoceptor and not an antagonist-selective site.

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