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Reduced serum dipeptidyl peptidase-IV after metformin and pioglitazone treatments. | LitMetric

Reduced serum dipeptidyl peptidase-IV after metformin and pioglitazone treatments.

Biochem Biophys Res Commun

Department of Metabolic Diseases, GlaxoSmithKline Inc., Research Triangle Park, NC 27709, USA.

Published: November 2004

AI Article Synopsis

Article Abstract

Dipeptidyl peptidase-IV (DPP-IV) regulates metabolism by degrading incretins involved in nutritional regulation. Metformin and pioglitazone improve insulin sensitivity whereas glyburide promotes insulin secretion. Zucker diabetic rats were treated with these antidiabetic agents for 2 weeks and DPP-IV activity and expression were determined. Serum DPP-IV activity increased whereas tissue activity decreased as the rats aged. Treatment of rats with metformin, pioglitazone, and glyburide did not alter DPP-IV mRNA expression in liver or kidney. Metformin and pioglitazone significantly (P<0.05) reduced serum DPP-IV activity and glycosylated hemoglobin. Glyburide did not lower DPP-IV activity or glycosylated hemoglobin. Regression analysis showed serum DPP-IV activity correlated with glycosylated hemoglobin (r=0.92) and glucagon-like peptide-1 levels (r=-0.49). Metformin, pioglitazone, and glyburide had no effect on serum DPP-IV activity in vitro, indicating these are not competitive DPP-IV inhibitors. We propose the in vivo inhibitory effects observed with metformin and pioglitazone on serum DPP-IV activity results from reduced DPP-IV secretion.

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Source
http://dx.doi.org/10.1016/j.bbrc.2004.09.021DOI Listing

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