Oncogenic herpesvirus KSHV Hijacks BMP-Smad1-Id signaling to promote tumorigenesis.

Oncogenic herpesvirus KSHV Hijacks BMP-Smad1-Id signaling to promote tumorigenesis.
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致癌疱疹病毒 KSHV 劫持 BMP-Smad1-Id 信号传导促进肿瘤发生

DOI:
10.1371/journal.ppat.1004253
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发表时间:
2014-07
期刊:
影响因子:
6.7
通讯作者:
Lan K
Lan K
中科院分区:
医学1区
文献类型:
--
作者:
Liang D;Hu H;Li S;Dong J;Wang X;Wang Y;He L;He Z;Gao Y;Gao SJ;Lan K

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卡波西肉瘤相关疱疹病毒(KSHV)是卡波西肉瘤(KS)的病原体,KS是一种常见于艾滋病患者的恶性肿瘤。KS是否是一种真正的肿瘤或增生一直是一个激烈的辩论的主题,直到最近,当KSHV明确显示有效地感染,永生化和转化大鼠原代间充质前体细胞(MM)。此外,KSHV转化的MM细胞(KMM)接种到裸鼠体内时,可有效诱导具有KS标志性特征的肿瘤。在这里,我们显示Smad 1作为一种新的结合蛋白的KSHV潜伏相关核抗原(拉娜)。拉娜与BMP激活的p-Smad 1相互作用并维持其在细胞核中的表达,并增强其在Id启动子上的负载。结果,Ids在KMM细胞中显著上调,并在人KS病变中大量表达。引人注目的是,BMP-Smad 1-Id通路的遗传和化学抑制在体外和体内阻断了KSHV转化细胞的致癌表型。这些发现说明了一种新的机制,通过这种机制,肿瘤病毒劫持并将发育途径转化为肿瘤发生不可或缺的致癌途径。重要的是,我们的研究结果证明了靶向BMP-Smad 1-Id通路抑制KSHV诱导的肿瘤生长的有效性,因此将BMP通路确定为KS有希望的治疗靶点。
Kaposi's sarcoma-associated herpesvirus (KSHV) is the etiological agent of Kaposi's sarcoma (KS), a malignancy commonly found in AIDS patients. Whether KS is a true neoplasm or hyperplasia has been a subject of intensive debate until recently when KSHV is unequivocally shown to efficiently infect, immortalize and transform rat primary mesenchymal precursor cells (MM). Moreover, KSHV-transformed MM cells (KMM) efficiently induce tumors with hallmark features of KS when inoculated into nude mice. Here, we showed Smad1 as a novel binding protein of KSHV latency-associated nuclear antigen (LANA). LANA interacted with and sustained BMP-activated p-Smad1 in the nucleus and enhanced its loading on the Id promoters. As a result, Ids were significantly up-regulated in KMM cells and abundantly expressed in human KS lesions. Strikingly, genetic and chemical inhibition of the BMP-Smad1-Id pathway blocked the oncogenic phenotype of KSHV-transformed cells in vitro and in vivo. These findings illustrate a novel mechanism by which a tumor virus hijacks and converts a developmental pathway into an indispensable oncogenic pathway for tumorigenesis. Importantly, our results demonstrate the efficacy of targeting the BMP-Smad1-Id pathway for inhibiting the growth of KSHV-induced tumors, and therefore identify the BMP pathway as a promising therapeutic target for KS.
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