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首页> 外文期刊>Apoptosis >Triggering of death receptor apoptotic signaling by human papillomavirus 16 E2 protein in cervical cancer cell lines is mediated by interaction with c-FLIP
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Triggering of death receptor apoptotic signaling by human papillomavirus 16 E2 protein in cervical cancer cell lines is mediated by interaction with c-FLIP

机译:宫颈癌细胞系中人乳头瘤病毒16 E2蛋白对死亡受体凋亡信号的触发是通过与c-FLIP相互作用介导的

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Human papillomavirus (HPV) E2 gene disruption is one of the key features of HPV-induced cervical malignant transformation. Though it is thought to prevent progression of carcinogenesis, the pro-apoptotic function of E2 protein remains poorly understood. This study shows that expression of HPV16 E2 induces apoptosis both in HPV-positive and -negative cervical cancer cell lines and leads to hyperactivation of caspase-8 and caspase-3. Activation of these signaling factors is responsible for the observed sensitivity to apoptosis upon treatment with anti-Fas antibody or TNF-α. In addition, immunoprecipitation experiments clearly show an interaction between HPV16 E2 and c-FLIP, a key regulator of apoptotic cell death mediated by death receptor signaling. Moreover, c-FLIP and a caspase-8 inhibitor protect cells from HPV16 E2-mediated apoptosis. Overexpression of c-FLIP rescues cervical cancer cells from apoptosis induced by HPV16 E2 protein expression. The data suggest that HPV16 E2 abrogates the apoptosis-inhibitory function of c-FLIP and renders the cell hypersensitive to the Fas/FasL apoptotic signal even below threshold concentration. This suggests a novel mechanism for deregulation of cervical epithelial cell growth upon HPV-induced transformation, which is of great significance in developing therapeutic strategies for intervention of cervical carcinogenesis.
机译:人乳头瘤病毒(HPV)E2基因破坏是HPV诱导的宫颈恶性转化的关键特征之一。尽管据认为可以防止癌变的进展,但对E2蛋白的促凋亡功能仍然知之甚少。这项研究表明,HPV16 E2的表达在HPV阳性和阴性宫颈癌细胞系中均诱导凋亡,并导致caspase-8和caspase-3过度活化。这些信号因子的激活是观察到的用抗Fas抗体或TNF-α治疗后对细胞凋亡的敏感性的原因。此外,免疫沉淀实验清楚地表明,HPV16 E2与c-FLIP之间存在相互作用,c-FLIP是由死亡受体信号传导介导的凋亡细胞死亡的关键调节剂。此外,c-FLIP和caspase-8抑制剂可保护细胞免受HPV16 E2介导的细胞凋亡。 c-FLIP的过表达使宫颈癌细胞免于HPV16 E2蛋白表达诱导的凋亡。数据表明,HPV16 E2消除了c-FLIP的凋亡抑制功能,甚至低于阈值浓度,也使细胞对Fas / FasL细胞凋亡信号高度敏感。这表明在HPV诱导的转化后宫颈上皮细胞生长失调的新机制,这在制定干预宫颈癌发生的治疗策略中具有重要意义。

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