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Journal of Lipid Research, Vol 35, 1918-1924, Copyright © 1994 by Lipid Research, Inc.
ARTICLES |
M Chen, JL Breslow, W Li and T Leff
Department of Biotechnology, Parke-Davis, Ann Arbor, MI 48105.
Insulin-dependent diabetes mellitus (IDDM) is associated with elevated plasma triglyceride levels that normalize after insulin administration. The observation that overexpression of the apoC-III gene in transgenic mice can cause hypertriglyceridemia and other evidence implicating apoC- III in the regulation of triglyceride levels prompted us to examine whether apoC-III might be involved in the hypertriglyceridemia associated with IDDM. To this end, the regulation of apoC-III gene expression was studied in the streptozotocin-treated mouse model of IDDM. In the insulin-deficient diabetic state, these mice have elevated glucose and triglyceride levels and a 1.4- to 1.5-fold increase in hepatic apoC-III mRNA levels, by Northern analysis as well as quantitative solution hybridization RNase protection assay. Insulin treatment normalized the glucose and triglyceride levels and diminished hepatic apoC-III mRNA levels by 59%. Analysis of transcription rates using the nuclear run-on technique demonstrated that the changes in hepatic apoC-III mRNA levels were the results of changes in the transcriptional activity of the gene. To determine the role of insulin in the regulation of apoC-III transcription, HepG2 cells were transfected with an apoC-III reporter construct, and treated with different insulin concentrations. The results demonstrated that insulin treatment induced a dose-dependent down-regulation of apoC-III transcriptional activity. These data suggest that the apoC-III transcriptional changes seen in animals are caused by differences in insulin concentrations. Assuming that apoC-III mRNA levels reflect the synthesis and secretion of the protein, these results present the possibility that overexpression of the apoC-III gene could contribute to the hypertriglyceridemia observed in IDDM.
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