Inhibition of geranylgeranyl transferase-I decreases cell viability of HTLV-1-transformed cells.

Inhibition of geranylgeranyl transferase-I decreases cell viability of HTLV-1-transformed cells.
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DOI:
10.3390/v3101815
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发表时间:
2011-10
期刊:
Viruses
影响因子:
--
通讯作者:
Pise-Masison CA
Pise-Masison CA
中科院分区:
其他
文献类型:
--
作者:
Edwards DC;McKinnon KM;Fenizia C;Jung KJ;Brady JN;Pise-Masison CA

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人类T细胞白血病病毒1型(HTLV-1)是成人T细胞白血病(ATL)的病原体,ATL是一种侵袭性和高度耐药的恶性肿瘤。Rho家族GTP酶调节肿瘤发生中的多种信号传导途径:细胞骨架组织、转录、细胞周期进程和细胞增殖。Rho家族GTP酶的香叶基香叶基化对于这些蛋白质的细胞膜定位和活化是必不可少的。目前尚不清楚HTLV-1转化的细胞是否优先对香叶基香叶基化抑制剂如GGTI-298敏感。在这份报告中,我们证明,GGTI-298降低细胞活力和诱导HTLV-1转化细胞的G2/M期积累,独立于p53再激活。用GGTI-298处理后,HTLV-1-LTR转录活性被抑制,Tax蛋白水平降低。此外,GGTI-298降低了NF-κB(Rho家族GTP酶的下游靶标)的活化。这些研究表明,蛋白质牛儿基牛儿基化有助于在HTLV-1转化细胞中细胞存活途径的失调。
Human T-cell leukemia virus type-1 (HTLV-1) is the etiological agent of adult T-cell leukemia (ATL), an aggressive and highly chemoresistant malignancy. Rho family GTPases regulate multiple signaling pathways in tumorigenesis: cytoskeletal organization, transcription, cell cycle progression, and cell proliferation. Geranylgeranylation of Rho family GTPases is essential for cell membrane localization and activation of these proteins. It is currently unknown whether HTLV-1-transformed cells are preferentially sensitive to geranylgeranylation inhibitors, such as GGTI-298. In this report, we demonstrate that GGTI-298 decreased cell viability and induced G2/M phase accumulation of HTLV-1-transformed cells, independent of p53 reactivation. HTLV-1-LTR transcriptional activity was inhibited and Tax protein levels decreased following treatment with GGTI-298. Furthermore, GGTI-298 decreased activation of NF-κB, a downstream target of Rho family GTPases. These studies suggest that protein geranylgeranylation contributes to dysregulation of cell survival pathways in HTLV-1-transformed cells.
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