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HTLV-1 bZIP 因子通过抑制 C/EBPα 信号通路促进成人 T 细胞白血病细胞的增殖。

HTLV-1 bZIP factor supports proliferation of adult T cell leukemia cells through suppression of C/EBPα signaling.

机构信息

College of Chemistry and Life Sciences, Zhejiang Normal University, 688 Yingbin Road, Jinhua, Zhejiang 321004, China.

出版信息

Retrovirology. 2013 Dec 21;10:159. doi: 10.1186/1742-4690-10-159.

DOI:10.1186/1742-4690-10-159
PMID:24359396
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3880043/
Abstract

BACKGROUND

Human T-cell leukemia virus type 1 (HTLV-1) is an oncogenic retrovirus etiologically associated with adult T-cell leukemia (ATL). The HTLV-1 bZIP factor (HBZ), which is encoded by minus strand of provirus, is expressed in all ATL cases and supports the proliferation of ATL cells. However, the precise mechanism of growth promoting activity of HBZ is poorly understood.

RESULTS

In this study, we showed that HBZ suppressed C/EBPα signaling activation induced by either Tax or C/EBPα. As mechanisms of HBZ-mediated C/EBPα inhibition, we found that HBZ physically interacted with C/EBPα and diminished its DNA binding capacity. Luciferase and immunoprecipitation assays revealed that HBZ repressed C/EBPα activation in a Smad3-dependent manner. In addition, C/EBPα was overexpressed in HTLV-1 infected cell lines and fresh ATL cases. HBZ was able to induce C/EBPα transcription by enhancing its promoter activity. Finally, HBZ selectively modulated the expression of C/EBPα target genes, leading to the impairment of C/EBPα-mediated cell growth suppression.

CONCLUSION

HBZ, by suppressing C/EBPα signaling, supports the proliferation of HTLV-1 infected cells, which is thought to be critical for oncogenesis.

摘要

背景

人类 T 细胞白血病病毒 1 型(HTLV-1)是一种致癌逆转录病毒,与成人 T 细胞白血病(ATL)在病因上有关。由前病毒的负链编码的 HTLV-1 bZIP 因子(HBZ)在所有 ATL 病例中均有表达,并支持 ATL 细胞的增殖。然而,HBZ 促进生长的精确机制仍知之甚少。

结果

在这项研究中,我们表明 HBZ 抑制了 Tax 或 C/EBPα 诱导的 C/EBPα 信号激活。作为 HBZ 介导的 C/EBPα 抑制的机制,我们发现 HBZ 与 C/EBPα 相互作用,并降低其 DNA 结合能力。荧光素酶和免疫沉淀测定表明,HBZ 以 Smad3 依赖的方式抑制 C/EBPα 的激活。此外,在 HTLV-1 感染的细胞系和新鲜的 ATL 病例中,C/EBPα 过表达。HBZ 通过增强其启动子活性来诱导 C/EBPα 的转录。最后,HBZ 选择性地调节 C/EBPα 靶基因的表达,导致 C/EBPα 介导的细胞生长抑制受损。

结论

HBZ 通过抑制 C/EBPα 信号,支持 HTLV-1 感染细胞的增殖,这被认为对肿瘤发生至关重要。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cfc3/3880043/d557d742d1ef/1742-4690-10-159-7.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cfc3/3880043/d557d742d1ef/1742-4690-10-159-7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cfc3/3880043/9cb6a446ad99/1742-4690-10-159-1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cfc3/3880043/fd70d9c8b45b/1742-4690-10-159-2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cfc3/3880043/3dd0f58b711a/1742-4690-10-159-3.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cfc3/3880043/227d51c6ae88/1742-4690-10-159-5.jpg
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