PMID: 8593936Mar 1, 1996Paper

Hypertriglyceridemia and hyperinsulinemia are potent inducers of endothelin-1 release in humans

Diabetes
P M PiattiG Pozza

Abstract

The purpose of the study was to evaluate fasting endothelin-1 levels in subjects with syndrome X, in subjects with insulinoma, and in normal subjects. The single and synergistic contributions of insulin and triglyceride levels to endothelin-1 release were studied in normal subjects. This was achieved by the evaluation of endothelin-1 levels in response to an insulin bolus combined with a euglycemic clamp (protocol A) and during intralipid (test 1) or saline (test 2) infusions lasting 360 min (protocol B). In protocol B, a euglycemic two-step hyperinsulinemic (25 and 125 mU x kg-1 x h-1) clamp was started at 120 min. Subjects with syndrome X showed significantly higher endothelin-1 levels than normal subjects and subjects with insulinoma (7.22 +/- 0.89 vs. 2.61 +/- 0.38 and 2.49 +/- 0.24 pg/ml, P < 0.01). After an insulin bolus, endothelin-1 levels peaked at 10 min (3.71 +/- 0.96 pg/ml). The incremental area of endothelin-1 was significantly higher after insulin than after a saline bolus. In test 1, an acute increase in triglyceride levels significantly enhanced endothelin-1 levels, with were further increased by the synergistic contribution of high insulin and triglyceride levels. In test 2, endothelin-1 release was achieved at...Continue Reading

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