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Effects of wild-type (Trp72) and mutant (Arg72) apolipoprotein(a) kringle IV-10 on the proliferation of human arterial smooth muscle cells / 中华医学杂志(英文版)
Chinese Medical Journal ; (24): 721-726, 2003.
Artigo em Inglês | WPRIM | ID: wpr-324424
ABSTRACT
<p><b>OBJECTIVE</b>To assess the atherogenicity of lipoprotein(a), the effect of the heterogeneity of lysine binding of apolipoprotein(a) [apo(a)], a plasminogen-like glycoprotein component on the proliferation of human arterial smooth muscle cells (SMCs).</p><p><b>METHODS</b>Both wild type (wt) Trp72 and mutant (mut) Trp72-->Arg forms of apo(a) kringle IV-10 were expressed by employing a GST-gene fusion system into E. coli. The proliferation of SMCs was determined by flow cytometry and MTT colorimetry. Enzyme-linked immunosorbent assay (ELISA) assay was used to detect the active form of transforming growth factor beta(1) (TGF-beta(1)).</p><p><b>RESULTS</b>Apo(a) wt-kringle IV-10 that has lysine binding properties possessed a growth-stimulating activity to SMCs on a dose-dependence manner by stimulating cells in the G(1)/G(0) phase of cell cycle to S and G(2)/M phase, and reduced significantly the amounts of endogenous active TGF-beta(1) in culture when compared with the control medium and the GST group (2.4 +/- 0.5 vs 8.6 +/- 1.6 and 9.1 +/- 1.7 ng/ml, P < 0.01). The growth-stimulating effect of apo(a) mut-kringle IV-10 deficient in lysine binding was negligible.</p><p><b>CONCLUSIONS</b>Apo(a) induces SMCs growth by inhibiting the activation of latent TGF-beta(1), an activity that may involve the ability of apo(a) kringle IV-10 to bind lysine. The mitogenic effect of apo(a) wt-kringle IV-10 on SMCs might play an active role in the atherogenic function of lipoprotein(a).</p>
Assuntos
Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Apolipoproteínas / Fisiologia / Técnicas In Vitro / Divisão Celular / Fator de Crescimento Transformador beta / Lipoproteína(a) / Kringles / Biologia Celular / Apoproteína(a) / Genética Limite: Humanos Idioma: Inglês Revista: Chinese Medical Journal Ano de publicação: 2003 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Apolipoproteínas / Fisiologia / Técnicas In Vitro / Divisão Celular / Fator de Crescimento Transformador beta / Lipoproteína(a) / Kringles / Biologia Celular / Apoproteína(a) / Genética Limite: Humanos Idioma: Inglês Revista: Chinese Medical Journal Ano de publicação: 2003 Tipo de documento: Artigo