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Abstract
Submicrogram concentrations (0.04-0.29 microM) of the microfilament disrupting agents cytochalasins D, E, and B (CD, CE, CB) were shown to inhibit secretagogue-stimulated 14C-aminopyrine accumulation (AP) in isolated rat gastric mucosal parietal cells. The microtubule disrupting agent colchicine had little influence on AP accumulation. Histamine- and dibutyryl cyclic AMP (DbcAMP)-stimulated AP accumulation was inhibited with an order of potency CD greater than CE approximately equal to CB. CB inhibition of these secretagogue actions was, however, only approximately 65-70% of the maximal stimulated response, whereas CD and CE caused 100% inhibition. On the other hand, carbamylcholine-stimulated AP accumulation was inhibited 100% by all cytochalasins tested with an order of potency CD approximately equal to CE greater than CB. These data are discussed in relation to acid secretagogue-induced morphological changes involving actin filament organization in parietal cells.
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