Expression and regulation of antiviral protein APOBEC3G in human neuronal cells.

Expression and regulation of antiviral protein APOBEC3G in human neuronal cells.
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DOI:
10.1016/j.jneuroim.2008.10.003
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发表时间:
2009-01-03
影响因子:
3.3
通讯作者:
Ho WZ
Ho WZ
中科院分区:
医学4区
文献类型:
--
作者:
Wang YJ;Wang X;Zhang H;Zhou L;Liu S;Kolson DL;Song L;Ye L;Ho WZ

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载脂蛋白B mRNA编辑酶催化多肽样3G(APOBEC 3G)是近年来发现的一种有效的抗病毒蛋白。本研究旨在探讨APOBEC 3G在人脑组织和中枢神经系统(CNS)细胞中的表达和调控。与免疫细胞类似,人脑组织和CNS细胞在mRNA和蛋白质水平上表达APOBEC 3G。干扰素(IFN-α、IFN-β和IFN-γ)、白细胞介素-1(IL-1)和肿瘤坏死因子(TNF)可上调人神经元细胞(NT 2-N)和星形胶质细胞(U87-MG)中APOBEC 3G的表达。然而,其他细胞因子(IL-4,IL-6和转化生长因子β 1)和CC-趋化因子(CCL 3,4和5)对APOBEC 3G的表达几乎没有影响。此外,假型HIV-1感染和来自脂多糖刺激的巨噬细胞培养物的细胞因子/趋化因子富集的上清液诱导NT 2-N细胞中的APOBEC 3G表达。在神经元细胞和星形胶质细胞中表达的APOBEC 3G具有生物学功能,因为特异性siRNA抑制APOBEC 3G表达导致这些细胞中假型HIV-1复制增加。这些结果提供了直接和令人信服的证据,在神经元细胞中存在功能性APOBEC 3G的细胞内表达和调节,这可能是参与CNS神经元保护的先天防御机制之一。
Apolipoprotein B mRNA-editing enzyme, catalytic polypeptide-like 3G (APOBEC3G) has recently been identified as a potent antiviral protein. Here, we examined the expression and regulation of APOBEC3G in human brain tissues and the cells of central nervous system (CNS). Similar to the immune cells, human brain tissue and the CNS cells expressed APOBEC3G at both mRNA and protein levels. The expression of APOBEC3G could be up-regulated in human neuronal cells (NT2-N) and astrocytes (U87-MG) by interferons (IFN-α, β and γ), interleukin-1 (IL-1), and tumor necrosis factor. Other cytokines (IL-4, IL-6 and transforming growth factor beta1) and CC-chemokines (CCL3, 4 and 5), however, had little impact on the expression of APOBEC3G. In addition, pseudotyped HIV-1 infection and cytokine/chemokine-enriched supernatants from lipopolysaccharide- stimulated macrophage cultures induced APOBEC3G expression in NT2-N cells. APOBEC3G expressed in the neuronal cells and astrocytes was biologically functional, as the suppression of APOBEC3G expression by the specific siRNA led to increase of pseudotyped HIV-1 replication in these cells. These findings provide direct and compelling evidence that there is intracellular expression and regulation of functional APOBEC3G in the neuronal cells, which may be one of innate defense mechanisms involved in the neuronal protection in the CNS.
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