Title : Adenovirus-mediated overexpression of liver carnitine palmitoyltransferase I in INS1E cells: effects on cell metabolism and insulin secretion.

Pub. Date : 2002 May 15

PMID : 11988095






7 Functional Relationships(s)
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1 Pancreatic beta-cells chronically exposed to fatty acids show higher carnitine palmitoyltransferase I (CPT I) protein levels, higher palmitate oxidation rates and an altered insulin response to glucose. Fatty Acids carnitine palmitoyltransferase 1B Rattus norvegicus
2 Pancreatic beta-cells chronically exposed to fatty acids show higher carnitine palmitoyltransferase I (CPT I) protein levels, higher palmitate oxidation rates and an altered insulin response to glucose. Fatty Acids carnitine palmitoyltransferase 1B Rattus norvegicus
3 The overexpression of CPT I in INS1E cells caused a more than a 5-fold increase in the levels of CPT I protein (detected by Western blotting), a 6-fold increase in the CPT activity, and an increase in fatty acid oxidation at 2.5 mM glucose (1.7-fold) and 15 mM glucose (3.1-fold). Fatty Acids carnitine palmitoyltransferase 1B Rattus norvegicus
4 This decrease depended on CPT I activity, since the presence of etomoxir, a specific inhibitor of CPT I, in the preincubation medium normalized the CPT I activity, the fatty-acid oxidation rate and the insulin secretion in response to glucose. Fatty Acids carnitine palmitoyltransferase 1B Rattus norvegicus
5 This decrease depended on CPT I activity, since the presence of etomoxir, a specific inhibitor of CPT I, in the preincubation medium normalized the CPT I activity, the fatty-acid oxidation rate and the insulin secretion in response to glucose. Fatty Acids carnitine palmitoyltransferase 1B Rattus norvegicus
6 This decrease depended on CPT I activity, since the presence of etomoxir, a specific inhibitor of CPT I, in the preincubation medium normalized the CPT I activity, the fatty-acid oxidation rate and the insulin secretion in response to glucose. Fatty Acids carnitine palmitoyltransferase 1B Rattus norvegicus
7 They also indicate that up-regulation of CPT I contributes to the loss of response to high glucose in beta-cells exposed to fatty acids. Fatty Acids carnitine palmitoyltransferase 1B Rattus norvegicus