Selective Induction of Heparin-binding Epidermal Growth Factor-like Growth Factor by Methylglyoxal and 3-Deoxyglucosone in Rat Aortic Smooth Muscle Cells

W. Che,M. Asahi,Motoko Takahashi,H. Kaneto,A. Okado,S. Higashiyama,N. Taniguchi

Published 1997 in Journal of Biological Chemistry

ABSTRACT

Methylglyoxal (MG) and 3-deoxyglucosone (3-DG), reactive dicarbonyl metabolites in the glyoxalase system and glycation reaction, respectively, selectively induced heparin-binding epidermal growth factor (HB-EGF)-like growth factor mRNA in a dose- and time-dependent manner in rat aortic smooth muscle cells (RASMC). A nuclear run-on assay revealed that the dicarbonyl may regulate expression of HB-EGF at the transcription level. The dicarbonyl also increased the secretion of HB-EGF from RASMC. However, platelet-derived growth factor, another known growth factor of smooth muscle cells (SMC), was not induced by both dicarbonyls. The dicarbonyl augmented intracellular peroxides prior to the induction of HB-EGF mRNA as judged by flow cytometric analysis using 2′,7′-dichlorofluorescin diacetate.N-Acetyl-l-cysteine and aminoguanidine suppressed both dicarbonyl-increased HB-EGF mRNA and intracellular peroxide levels in RASMC.dl-Buthionine-(S,R)-sulfoximine increased the levels of 3-DG-induced HB-EGF mRNA. Furthermore, hydrogen peroxide alone also induced HB-EGF mRNA in RASMC. These results indicate that MG and 3-DG induce HB-EGF by increasing the intracellular peroxide levels. In addition, the pretreatment with 12-O-tetra-decanoylphorbol-13-acetate failed to alter dicarbonyl-induced HB-EGF mRNA expression in RASMC, suggesting that the signal transducing mechanism is not mediated by protein kinase C. Since HB-EGF is known as a potent mitogen for smooth muscle cells and is abundant in atherosclerotic plaques, the induction of HB-EGF by MG and 3-DG, as well as the concomitant increment of intracellular peroxides, may trigger atherogenesis during diabetes.

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