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MAPKK-Dependent Growth Factor-Induced Upregulation of P2Y2Receptors in Vascular Smooth Muscle Cells

https://doi.org/10.1006/bbrc.1999.0676Get rights and content

Abstract

The ATP- and UTP-sensitive P2Y2receptor which mediates both contractile and mitogenic effects has recently been shown to be upregulated in the synthetic phenotype of the vascular smooth muscle cell (VSMC). Using a competitive RT-PCR we demonstrate that the P2Y2receptor mRNA is increased by fetal calf serum and other growth factors in a MAPKK-dependent way. This was confirmed at the functional level by examining UTP-stimulated release of intracellular Ca2+. Furthermore, the P2Y2receptor mRNA is positively autoregulated by ATP and the mRNA is rapidly degraded with only 26% remaining after 1 h in the presence of actinomycin D. Our results indicate growth factor regulation and rapid turnover of the P2Y2receptor mRNA, which may be of importance in atherosclerosis and neointima formation after balloon angioplasty.

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To whom correspondence should be addressed at Department of Biological Cell Research 1, EB-blocket, Lund University Hospital, S-221 85 Lund, Sweden. Fax: +46 46 328242. E-mail:[email protected].

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