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未巯基化vGPCR的胞外氨基端可降低hGRO-α在裸鼠中的致瘤性

, PP. 876-882

Keywords: 卡波氏肉瘤相关疱疹病毒,vGPCR,hGRO-&alpha,巯基化酪氨酸,致瘤性

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Abstract:

卡波氏肉瘤相关疱疹病毒(KSHV)编码的G-蛋白偶联受体(vGPCR)是一种致瘤蛋白,它与KSHV相关恶性肿瘤的发生密切相关.本工作组前期研究发现,vGPCR胞外氨基端(N端)第26位和第28位酪氨酸(Y26和Y28)均具有巯基化修饰,且该巯基化修饰对于vGPCR在裸鼠中的致瘤性至关重要.hGRO-α可结合巯基化的vGPCR,并通过自分泌促进其致瘤性.有趣的是,未巯基化的vGPCR突变体(yydd-vGPCR)削弱由hGRO-α导致的肿瘤的发生.本研究表达和纯化了vGPCR的N端(wt-vGN)和未巯基化的vGPCR突变体的N端(yydd-vGN).放射性标记实验结果表明,wt-vGN而非yydd-vGN可结合[35S]标记的硫酸盐.在裸鼠实验中,稳定表达yydd-vGN的NIH3T3细胞而非稳定表达wt-vGN的NIH3T3细胞可强烈抑制hGRO-α导致的肿瘤发生.本研究证明,未巯基化的vGPCR胞外N端的可降低hGRO-α在裸鼠中的致瘤性.

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