LDL stimulates collagen mRNA synthesis in mesangial cells through induction of PKC and TGF-β expression.

LDL stimulates collagen mRNA synthesis in mesangial cells through induction of PKC and TGF-β expression.
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LDL 通过诱导 PKC 和 TGF-β 表达来刺激系膜细胞中胶原蛋白 mRNA 的合成。

DOI:
10.1152/ajprenal.1999.277.3.f369
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发表时间:
1999
期刊:
American journal of physiology. Renal physiology
影响因子:
--
通讯作者:
Y. S. Kim
Y. S. Kim
中科院分区:
--
文献类型:
--
作者:
Hyun Soon Lee;B. Kim;H. Hong;Y. S. Kim

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肾小球中异常的脂质积累可能与肾小球硬化的发病机制有关。低密度脂蛋白 (LDL) 刺激培养的人系膜细胞 (HMC) 中胶原蛋白 mRNA 的表达。为了探索 LDL 促进胶原蛋白基因表达的可能分子机制,我们研究了 LDL 对蛋白激酶 C (PKC) 活性和转化生长因子-β (TGF-β) 表达的影响(与 HMC 中胶原蛋白基因调控相关)。 LDL (200 μg/ml) 在 15 分钟内诱导 PKC 活性急剧增加,特别是 PKC-α 和 -δ,并在 2 小时内降至对照值。 LDL 在与 HMC 孵育 30 分钟内刺激 TGF-β1、α1(I) 和 α1(IV) 胶原蛋白 mRNA 表达,并且水平保持升高直至第 4 小时。LDL 诱导 HMC 分泌 TGF-β。 CCL-64 水貂肺细胞测定表明,这种 TGF-β 具有部分生物活性。 LDL 对 HMC 中胶原蛋白基因调节的刺激作用可通过使用 GF-109203X (GFX) 抑制 PKC 或使用佛波醇肉豆蔻酸酯乙酸酯下调 PKC 来阻断。 TGF-β 中和抗体抑制暴露于 LDL 的 HMC 增加的胶原蛋白 mRNA 表达。 PKC的下调或抑制并不影响LDL对TGF-β mRNA或蛋白表达的刺激作用。这些结果表明,在 HMC 中,LDL 通过 PKC-α 和 -δ 的快速激活以及 TGF-β 的转录上调来刺激胶原蛋白 mRNA 的表达。因此,PKC 和 TGF-β 可能在 LDL 上调 HMC 中胶原蛋白基因表达的途径中充当独立的关键信号传导中介。
Abnormal lipid accumulation in glomeruli could be implicated in the pathogenesis of glomerulosclerosis. Low-density lipoprotein (LDL) stimulates collagen mRNA expression in cultured human mesangial cells (HMC). To explore the possible molecular mechanisms by which LDL promotes collagen gene expression, we examined the effects of LDL on protein kinase C (PKC) activity and transforming growth factor-β (TGF-β) expression in relation to collagen gene regulation in HMC. LDL (200 μg/ml) induced an acute increase in PKC activity, particularly PKC-α and -δ, within 15 min, which decreased to control value at 2 h. LDL stimulated TGF-β1, and α1(I) and α1(IV) collagen mRNA expression within 30 min of incubation with HMC, and levels remained elevated until hour 4. LDL induced the secretion of TGF-β by HMC. This TGF-β was shown by CCL-64 mink lung cell assay to be, in part, bioactive. The stimulatory effects of LDL on collagen gene regulation in HMC were blocked by the inhibition of PKC using GF-109203X (GFX) or the downregulation of PKC using phorbol myristate acetate. Neutralizing antibody to TGF-β inhibited the increased collagen mRNA expression by HMC exposed to LDL. The downregulation or inhibition of PKC did not affect the stimulatory effect of LDL on TGF-β mRNA or protein expression. These results suggest that in HMC, LDL stimulates collagen mRNA expression through the rapid activation of PKC-α and -δ and transcriptional upregulation of TGF-β. Thus PKC and TGF-β may function as independent key signaling intermediaries in the pathway by which LDL upregulates collagen gene expression in HMC.
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转化生长因子-β 的产生在抗兔肾小球​​基底膜疾病中的作用。
DOI: --
发表时间: 1991
期刊: The American journal of pathology
影响因子: --
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