PI3Kγ mediates kaposi's sarcoma-associated herpesvirus vGPCR-induced sarcomagenesis.

PI3Kγ mediates kaposi's sarcoma-associated herpesvirus vGPCR-induced sarcomagenesis.
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PI3Kγ介导了Kaposi与肉瘤相关的疱疹病毒VGPCR诱导的肌瘤作用。

DOI:
10.1016/j.ccr.2011.05.005
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发表时间:
2011-06-14
期刊:
影响因子:
50.3
通讯作者:
Gutkind JS
Gutkind JS
中科院分区:
医学1区
文献类型:
--
作者:
Martin D;Galisteo R;Molinolo AA;Wetzker R;Hirsch E;Gutkind JS

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由卡波西肉瘤相关疱疹病毒(KSHV)诱导的血管增生性肿瘤已经成功地用雷帕霉素治疗,这提供了mTOR抑制剂在人类恶性肿瘤中的临床活性的直接证据。然而,长期的mTOR抑制可能会引起免疫功能低下患者的担忧,包括AIDS-KS。在这里,我们探讨了KSHV癌基因是否部署了激活mTOR的细胞类型特异性信号通路,这可以用来阻止KS的发展,同时最大限度地减少免疫抑制作用。我们发现,PI 3 K γ,一种表现出有限组织分布的PI 3 K亚型,是从KSHV编码的vGPCR癌基因到Akt/mTOR的信号传导所严格需要的。事实上,通过使用内皮特异性基因递送系统模拟KS发展,我们提供了遗传学和药理学证据,表明PI 3 K γ可能代表KS治疗干预的合适分子靶点。
Angioproliferative tumors induced by the Kaposi’s Sarcoma associated herpesvirus (KSHV) have been successfully treated with rapamycin, which provided direct evidence of the clinical activity of mTOR inhibitors in human malignancies. However, prolonged mTOR inhibition may raise concerns in immunocompromised patients, including AIDS-KS. Here, we explored whether KSHV-oncogenes deploy cell-type specific signaling pathways activating mTOR, which could be exploited to halt KS development while minimizing immune suppressive effects. We found that PI3Kγ, a PI3K isoform exhibiting restricted tissue distribution, is strictly required for signaling from the KSHV-encoded vGPCR oncogene to Akt/mTOR. Indeed, by using an endothelial-specific gene delivery system modeling KS development, we provide genetic and pharmacological evidence that PI3Kγ may represent a suitable molecular target for therapeutic intervention in KS.
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