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- W2063873922 abstract "We previously demonstrated that the feeding of guanidinated casein, whose lysine residues are converted to homoarginine, stimulates pancreatic secretion much higher than that of intact casein in chronic bile-pancreatic juice (BPJ)-diverted rats, which suggests that the guanidino group is involved in BPJ-independent enhancement of pancreatic secretion. However, the role of the guanidino group in the protein for the enhancement of pancreatic secretion has not been clarified. In this study, we examined the stimulation of pancreatic secretion by a arginine rich dietary protein, protamine (25, 50 mg/ml), and then determined whether the guanidino group in protamine was responsible for the secretory responses in normal and BPJ-diverted rat by comparison with pancreatic secretion between intact and deguanidinated protamine. The deguanidinated protamine was prepared by converting arginine residues of salmon protamine to ornithine using heated hydrazine (conversion rate of arginine residue was 87%). In normal rats, pancreatic protein and chymotrypsin secretion were stimulated in dose-response fashion after a duodenal instillation of native protamine solution (25, 50 mg in 1 ml). In chronic BPJ-diverted rats, native protamine (25 mg) maximally stimulated pancreatic protein and protease secretion. In contrast, deguanidinated protamine (50 mg in 1 ml) did not stimulate pancreatic secretion in both normal and BPJ-diverted rats. In addition, the duodenal administration of arginine, which is equal to the amount contained in 50 mg of native protamine, had no effect on pancreatic secretion in both rats. These results suggest that a naturally occurring protein, protamine, stimulates pancreatic secretion by a luminal BPJ-independent mechanism and that the guanidino group in this protein is responsible for stimulating pancreatic secretion in BPJ-diverted rats." @default.
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- W2063873922 date "1999-03-01" @default.
- W2063873922 modified "2023-09-23" @default.
- W2063873922 title "Guanidino Group Is Involved in the Stimulation of Exocrine Pancreatic Secretion by Protamine in Normal and Chronic Bile-Pancreatic Juice-Diverted Rats" @default.
- W2063873922 doi "https://doi.org/10.1097/00006676-199903000-00008" @default.
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