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Altered synthesis o...
Altered synthesis of some secretory proteins in pancreatic lobules isolated from streptozotocin-induced diabetic rats
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- Duan, Rui-Dong (author)
- Lund University,Lunds universitet,Medicin, Lund,Sektion II,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Gastro,Forskargrupper vid Lunds universitet,Medicine, Lund,Section II,Department of Clinical Sciences, Lund,Faculty of Medicine,Lund University Research Groups
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- Erlanson-Albertsson, Charlotte (author)
- Lund University,Lunds universitet,Aptitkontroll,Forskargrupper vid Lunds universitet,Appetite Regulation,Lund University Research Groups
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(creator_code:org_t)
- Ovid Technologies (Wolters Kluwer Health), 1990
- 1990
- English 8 s.
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In: Pancreas. - : Ovid Technologies (Wolters Kluwer Health). - 0885-3177. ; 5:2, s. 136-143
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Abstract
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- The in vitro incorporation of [35S]cysteine into lipase, colipase, amylase, procarboxypeptidase A and B, and the serine proteases and total proteins was studied in pancreatic lobules isolated from normal and diabetic rats with or without insulin treatment. The incorporation of [35S]cysteine into total proteins was 65% greater in pancreatic lobules from diabetic animals than from normal rats. The increased incorporation was partly reversed by insulin treatment (2 U/100 g/day for 5 days) of diabetic rats. The relative rates of biosynthesis for amylase and the procarboxypeptidases in diabetic pancreatic lobules were decreased by 75 and 25%, respectively, after 1 h of incubation, while those for lipase, colipase, and the serine proteases were increased by 90, 85, and 35%, respectively. The absolute rates of synthesis for these enzymes changed in the same direction as the relative rates in diabetic lobules, except that for the procarboxypeptidases, which did not change. The changed rates of biosynthesis for the pancreatic enzymes were reversed by insulin treatment of the diabetic rats. Kinetic studies showed that the incorporation of [35S]cysteine into amylase, lipase, and colipase was linear until up to 2 h of incubation in normal pancreatic lobules, while in the diabetic lobules the incorporation into lipase and colipase was accelerated, reaching a plateau level already after 1 h of incubation. It is concluded that the biosynthesis of pancreatic secretory proteins in diabetic rats is greatly changed both in terms of quantity and kinetics.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Endokrinologi och diabetes (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Endocrinology and Diabetes (hsv//eng)
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- art (subject category)
- ref (subject category)
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