Gumbi Pamela P, Nkwanyana Nonhlanhla N, Bere Alfred, Burgers Wendy A, Gray Clive M, Williamson Anna-Lise, Hoffman Margaret, Coetzee David, Denny Lynette, Passmore Jo-Ann S
Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Observatory, Cape Town, South Africa.
J Virol. 2008 Sep;82(17):8529-36. doi: 10.1128/JVI.00183-08. Epub 2008 Jun 18.
The female genital tract is the major route of heterosexual human immunodeficiency virus (HIV) acquisition and transmission. Here, we investigated whether HIV-specific CD8 T-cell-mediated immune responses could be detected in the genital mucosa of chronically HIV-infected women and whether these were associated with either local mucosal HIV shedding or local immune factors. We found that CD8(+) T-cell gamma interferon responses to Gag were detectable at the cervix of HIV-infected women but that the magnitude of genital responses did not correlate with those similarly detected in blood. This indicates that ex vivo HIV responses in one compartment may not be predictive of those in the other. We found that increased genital tumor necrosis factor alpha (TNF-alpha) and interleukin-10 (IL-10) levels correlated significantly with levels of Gag-specific CD8(+) T cells at the cervix. Women who were detectably shedding virus in the genital tract had significantly increased cervical levels of TNF-alpha, IL-1beta, IL-6, and IL-8 compared to women who were not detectably shedding virus. We were, however, unable to detect any association between the magnitude of cervical HIV-specific responses and mucosal HIV shedding. Our results support the hypothesis that proinflammatory cytokines in the female genital tract may promote HIV replication and shedding. In addition, we further show that inflammatory cytokines are associated with increased levels of HIV-specific CD8 effector cells at the genital mucosa but that these were not able to control genital HIV shedding.
女性生殖道是异性传播人类免疫缺陷病毒(HIV)感染和传播的主要途径。在此,我们研究了在慢性HIV感染女性的生殖黏膜中是否能检测到HIV特异性CD8 T细胞介导的免疫反应,以及这些反应是否与局部黏膜HIV脱落或局部免疫因子相关。我们发现,在HIV感染女性的宫颈处可检测到对Gag的CD8(+) T细胞γ干扰素反应,但生殖部位反应的强度与在血液中类似检测到的反应强度不相关。这表明一个部位的离体HIV反应可能无法预测另一个部位的反应。我们发现,生殖部位肿瘤坏死因子α(TNF-α)和白细胞介素-10(IL-10)水平的升高与宫颈处Gag特异性CD8(+) T细胞的水平显著相关。与未检测到病毒脱落的女性相比,在生殖道可检测到病毒脱落的女性宫颈处TNF-α、IL-1β、IL-6和IL-8的水平显著升高。然而,我们未能检测到宫颈HIV特异性反应的强度与黏膜HIV脱落之间存在任何关联。我们的结果支持这样一种假说,即女性生殖道中的促炎细胞因子可能促进HIV复制和脱落。此外,我们进一步表明,炎症细胞因子与生殖黏膜处HIV特异性CD8效应细胞水平的升高相关,但这些细胞无法控制生殖部位的HIV脱落。