Pancreatic B-cells secrete a range of novel peptides besides insulin |
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| Authors: | AM Sopwith CN Hales JC Hutton |
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| Institution: | Department of Clinical Biochemistry, University of Cambridge, Addenbrooke''s Hospital, Hills Road, Cambridge, CB2 2QR U.K. |
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| Abstract: | Insulin secretion by a transplantable rat islet B-cell tumour is accompanied by the release of two putative proinsulin cleavage intermediates, four peptides of Mr 9000–12 000 (excluding proinsulin) and peptides of Mr 21 000, 34 000 and 60 000. Granule-enriched subcellular preparations contain major peptides of identical Mr values. Of these peptides seven at least coincide in molecular weight with peptides secreted by isolated rat islets and thus may be constituents of the normal insulin secretory granule. |
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| Keywords: | Peptide secretion Insulin Pancreatic B-cell Hepes 4-(2-hydroxyethyl)-1-piperazinepropanesulphonic acid |
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