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The FASEB Journal, Vol 3, 121-126, Copyright © 1989 by The Federation of American Societies for Experimental Biology

REVIEWS

Two hypotheses on the feedback regulation of pancreatic enzyme secretion

T Fushiki and K Iwai
Department of Food Science and Technology, Faculty of Agriculture, Kyoto University, Japan.

We review the mechanisms underlying the feedback regulation of pancreatic enzyme secretion in response to a meal. Pancreatic enzyme secretion in the rat and pig is known to be regulated by a negative feedback mechanism mediated by intestinal trypsin and chymotrypsin. Such a mechanism has recently been noted in humans. The presence of these enzymes in the small intestine suppresses pancreatic enzyme secretion, whereas their removal increases it. Two novel peptides have been proposed to account for the stimulation of pancreatic enzyme secretion in response to feeding trypsin inhibitor. One was assumed to be present in rat pancreatic juice and the other to be spontaneously secreted from the rat small intestine. In either case, trypsin and trypsin inhibitors do not directly interact with the luminal surface of the small intestine, but their actions are mediated by a trypsin- sensitive, cholecystokinin-releasing peptide. This is a novel explanation of the well-recognized stimulation of pancreatic enzyme secretion in response to dietary protein intake.


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Copyright © 1989 by The Federation of American Societies for Experimental Biology.