Zhang Liguo, Kovalev Grigoriy I, Su Lishan
Department of Microbiology and Immunology, The Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill 27599-7295, USA.
Blood. 2007 Apr 1;109(7):2978-81. doi: 10.1182/blood-2006-07-033159.
The Rag2-gammaC double-knockout (DKO) mouse lacks T, B, and natural killer (NK) cells, and allows development of a functional human immune system with human CD34+ hematopoietic stem/progenitor cells (DKO-hu HSCs). Normal human T, B, and dendritic cells are present in peripheral blood, thymus, spleen, and lymph nodes. We report that both CCR5 and CXCR4 are expressed on human immature and mature T cells. DKO-hu HSC mice allow efficient HIV-1 infection with plasma high viremia. High levels of productive infection occur in the thymus, spleen, and lymph nodes. Human CD4+ T cells are gradually depleted by HIV-1 in a dose-dependent manner. In addition, HIV-1 infection persists in infected DKO-hu HSC mice for at least 19 weeks, with infectious HIV-1 in lymphoid tissues. Thus, the DKO-hu HSC mouse can serve as a relevant in vivo model to investigate mechanisms of HIV-1 infection and immunopathogenesis as well as to develop anti-HIV-1 therapeutics.
Rag2-γC双敲除(DKO)小鼠缺乏T细胞、B细胞和自然杀伤(NK)细胞,可利用人CD34+造血干/祖细胞(DKO-hu HSCs)发育出功能性人类免疫系统。外周血、胸腺、脾脏和淋巴结中存在正常的人类T细胞、B细胞和树突状细胞。我们报告,CCR5和CXCR4在人类未成熟和成熟T细胞上均有表达。DKO-hu HSC小鼠可高效感染HIV-1并出现血浆高病毒血症。在胸腺、脾脏和淋巴结中发生高水平的 productive感染。人类CD4+ T细胞被HIV-1以剂量依赖的方式逐渐消耗。此外,HIV-1感染在受感染的DKO-hu HSC小鼠中持续至少19周,淋巴组织中存在具有传染性的HIV-1。因此,DKO-hu HSC小鼠可作为一种相关的体内模型,用于研究HIV-1感染和免疫发病机制,以及开发抗HIV-1疗法。