The effects of chronic elevations of growth hormone levels on hepatic insulin binding and action were studied in rats with subcutaneously implanted growth hormone-producing tumours. These animals were significantly heavier (p less than 0.001; 388 +/- 29 versus 239 +/- 4 g), had elevated insulin leve
Insulin binding and action in isolated rat hepatocytes: Evidence for spare receptors
โ Scribed by H.J.L. Frank; M.B. Davidson; P.A. Serbin
- Book ID
- 118948276
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 704 KB
- Volume
- 30
- Category
- Article
- ISSN
- 1532-8600
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We investigated the effect of phorbol 12-myristate 13-acetate (PMA), a protein kinase C (PKC) activator on insulin receptors and insulin action in freshly isolated and primary cultures of rat hepatocytes. PMA (1 x 10(-7) M) did not alter insulin receptor numbers or affinity either acutely or chronic
Fasting leads to an increase in insulin binding to isolated rat hepatocytes from 12 to 17%. This increase was accounted for by changes in the affinity of insulin receptors without alteration in their number. In contrast, the responsiveness of hepatocytes to insulin was markedly diminished in fasted