Abstract
Tetrodotoxin (TTX, 10 microM) did not inhibit prostaglandin E2 (PGE2)-stimulated increases in electrical activity in intact or stripped sheets of rat small intestine, although it reduced basal electrical activity in the intact preparation. Basal and PGE2-stimulated cAMP production by enterocytes isolated from the small intestine was unaffected by TTX. Thus its reported ability to inhibit prostaglandin-induced fluid secretion in-vivo does not appear to represent a direct interaction of the neurotoxin with the mechanism of prostaglandin action at the enterocyte.
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