Thymic plasmacytoid dendritic cells are susceptible to productive HIV-1 infection and efficiently transfer R5 HIV-1 to thymocytes in vitro.

Thymic plasmacytoid dendritic cells are susceptible to productive HIV-1 infection and efficiently transfer R5 HIV-1 to thymocytes in vitro.
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DOI:
10.1186/1742-4690-8-43
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发表时间:
2011-06-03
期刊:
影响因子:
3.3
通讯作者:
Cameron PU
Cameron PU
中科院分区:
医学2区
文献类型:
--
作者:
Evans VA;Lal L;Akkina R;Solomon A;Wright E;Lewin SR;Cameron PU

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胸腺的 HIV-1 感染会导致 HIV-1 感染者的 CD4+ T 细胞再生缺陷和损失。由于胸腺树突状细胞 (DC) 允许 HIV-1 感染,因此我们检查了胸腺 DC 增强胸腺细胞感染的能力,这可能有助于 CD4+ T 细胞的总体消耗。我们使用增强型绿色荧光蛋白 (EGFP) CCR5 (R5)-tropic NL(AD8) 和 CXCR4 (X4)-tropic NL4-3 HIV-1 报告病毒比较了分离的人胸腺和血液 CD11c+ 髓样 DC (mDC) 和 CD123+ 浆细胞样 DC (pDC) 的生产性感染。通过单独培养这些 DC 子集或与分选的胸腺细胞一起培养,确定胸腺 mDC 和 pDC 中生产性 HIV-1 感染的转移。暴露于 R5 HIV-1 和 X4 HIV-1 后,在胸腺 pDC 和 mDC 中均观察到生产性感染。胸腺 pDC 比胸腺 mDC 更容易被 R5 和 X4 HIV-1 有效感染(p = 0.03;n = 6)。胸腺 pDC 有效地将生产性 R5 HIV-1 感染转移至 CD3hi(p = 0.01;平均倍数增加 6.5;n = 6)和 CD3lo 胸腺细胞(平均倍数增加 1.6;n = 2)。相比之下,X4 或 R5 HIV-1 均未观察到胸腺 mDC 的生产性感染转移。胸腺 pDC 将 R5 HIV-1 有效转移至成熟和未成熟胸腺细胞的能力可能代表了 HIV-1 感染个体早期感染和胸腺细胞和 CD4+ T 细胞产生受损的途径。
HIV-1 infection of the thymus contributes to the defective regeneration and loss of CD4+ T cells in HIV-1-infected individuals. As thymic dendritic cells (DC) are permissive to infection by HIV-1, we examined the ability of thymic DC to enhance infection of thymocytes which may contribute to the overall depletion of CD4+ T cells. We compared productive infection in isolated human thymic and blood CD11c+ myeloid DC (mDC) and CD123+ plasmacytoid DC (pDC) using enhanced green fluorescent protein (EGFP) CCR5 (R5)-tropic NL(AD8) and CXCR4 (X4)-tropic NL4-3 HIV-1 reporter viruses. Transfer of productive HIV-1 infection from thymic mDC and pDC was determined by culturing these DC subsets either alone or with sorted thymocytes. Productive infection was observed in both thymic pDC and mDC following exposure to R5 HIV-1 and X4 HIV-1. Thymic pDC were more frequently productively infected by both R5 and X4 HIV-1 than thymic mDC (p = 0.03; n = 6). Thymic pDC efficiently transferred productive R5 HIV-1 infection to both CD3hi (p = 0.01; mean fold increase of 6.5; n = 6) and CD3lo thymocytes (mean fold increase of 1.6; n = 2). In comparison, transfer of productive infection by thymic mDC was not observed for either X4 or R5 HIV-1. The capacity of thymic pDC to efficiently transfer R5 HIV-1 to both mature and immature thymocytes that are otherwise refractory to R5 virus may represent a pathway to early infection and impaired production of thymocytes and CD4+ T cells in HIV-1-infected individuals.
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