The Regulatory Expression of Procollagen COOH-Terminal Proteinase Enhancer in the Proliferation of Vascular Smooth Muscle Cells

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• 作者：Kanaki ; Tatsuro ; Morisaki ; Nobuhiro ; Bujo ; Hideaki ; Takahashi ; Kazuo ; Ishii ; Itsuko ; Saito ; Yasushi
• 刊名：Biochemical and Biophysical Research Communications
• 出版年：2000
• 出版时间：April 21, 2000
• 年：2000
• 卷：270
• 期：3
• 页码：1049-1054
• 全文大小：208 K

文摘

Intimal hyperplasia following arterial endothelial denudation results in large part from the proliferation of vascular smooth muscle cells (SMCs) and matrix accumulation. Procollagen COOH-terminal proteinase enhancer (PCPE) binds procollagen COOH-propeptides and potentiates procollagen COOH-proteinase activity to cleave COOH-propeptides of procollagens I–III. Here we report the enhanced expression of PCPE in cultured SMCs and in intimal thickening induced by arterial injury. The levels of PCPE mRNA in parallel with the level of p21^Cip1 mRNA, as a negative regulator of cellular proliferation, increased under serum deprivation or reduced cellular proliferation in cultured SMCs. In contrast, rapidly proliferating cells show the decreased levels of PCPE mRNA. In vivo, the marked induction of PCPE in injured rat arteries occurred at 14 days after endothelial denudation. The induced expression levels of PCPE as well as p21^Cip1 were maintained until 42 days, although cyclin E expression declined. Furthermore, transforming growth factor β1 (TGF-β1), an important regulator of cellular proliferation in atheroma, increased the levels of the PCPE mRNA in cultured SMCs. Thus, the regulatory expression of PCPE dependent on cellular proliferation, and particularly contact inhibition, may play a key role in the proliferation of SMCs and matrix production during the process of atheroma formation.