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首页> 外文期刊>Journal of Cellular Physiology >Effects of the overexpression of the small heat shock protein, HSP27, on the sensitivity of human fibroblast cells exposed to oxidative stress.
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Effects of the overexpression of the small heat shock protein, HSP27, on the sensitivity of human fibroblast cells exposed to oxidative stress.

机译:小热的超表达的影响休克蛋白、HSP27在人类的敏感性成纤维细胞暴露于氧化应激。

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摘要

The role of the human small heat shock protein (HSP27) in oxidative stress was examined using stable transformants of an immortalized human fibroblast cell line (KMST-6) isolated by transfection of HSP27 expression vectors. Several stable transformants that expressed high or low levels of HSP27 protein were obtained. Clones expressing high levels of HSP27 were more sensitive to growth inhibition by a low dose of hydrogen peroxide (0.1 mM) than those expressing low levels. Clones expressing high levels of HSP27 did not acquire obvious resistance to hyperthermy and cytotoxic agents, except for one (#13), in which resistance to cytotoxic agents was increased. The level of phosphorylated HSP27 in clones expressing high levels of this protein increased at 30 min and was sustained even 4 hours after exposing the cells to 0.1 mM of hydrogen peroxide. On the other hand, the levels in clones expressing low levels of HSP27 were reduced within 4 hours after exposure to hydrogen peroxide. Furthermore, overexpression of nonphosphorylatable mutant HSP27 did not affect sensitivity to oxidative stress. These results suggested that constitutively high expression of HSP27 in KMST-6 cells make them susceptible to oxidative stress resulting in growth arrest, and this mechanism could involve the phosphorylation of HSP27.
机译:人类小热休克蛋白的作用(HSP27)在氧化应激是检查使用稳定的转化株的永生的人类纤维母细胞细胞系(KMST-6)隔离转染HSP27表达向量。稳定的转化株,高或低表达HSP27蛋白水平。表达高水平的HSP27更敏感的低剂量抑制增长过氧化氢比表达(0.1毫米)低的水平。HSP27并未获得明显的阻力高热疗法和细胞毒性药物,除了一个(# 13),抵抗细胞毒性药物是增加了。在克隆表达高水平的蛋白质增加30分钟,甚至是持续4小时后暴露的细胞0.1毫米过氧化氢。在克隆HSP27的表达水平较低减少接触后4小时内氢过氧化。nonphosphorylatable HSP27基因突变没有影响对氧化应激的敏感性。建议持续高表达HSP27在KMST-6细胞使其容易氧化应激导致增长逮捕,这种机制可能涉及的磷酸化HSP27。

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