MHC CLASS I ANTIHIV SPECIFIC CD8 T LYMPHOCYTE RESPONSE IN CNS OF HIV PATIENTS

申请人实验室的最新研究结果表明，CSF HIV-1 RNA浓度的降低与神经心理学测试表现的改善密切相关。这些结果为HIV-1病毒载量在艾滋病痴呆综合征（ADC）发病机制中的作用提供了进一步的证据。提出的合作研究的总体目标是确定MHC I类限制性抗HIV-1特异性CD 8+细胞毒性T淋巴细胞（CTL）应答在CNS内控制HIV-1复制中的作用。提出研究来检验工作假设，即HIV相关的认知障碍是由于CNS内HIV-1复制失控，这种失控是病毒逃避CTL应答的结果，并且病毒逃避免疫控制导致ADC患者CNS内选择独特的HIV-1株。该项目将作为夏威夷大学和华盛顿大学的调查人员之间的综合和协调合作进行。 该项目的申请人部分将专注于表征HIV-1感染受试者CNS中的HIV-1特异性CTL应答，并确定CNS衍生的HIV-1毒株表位序列的变化是否影响此类表位的识别、认知功能障碍和CSF HIV-1病毒载量。在这两个组成部分中待检验的假设与实验设计密切相关，并将允许以最有效和互利的方式应用调查的互补专门知识。这项合作还将为夏威夷大学的学生和研究员提供充分的机会，使他们能够接受在进行这项研究工作中将要采用的基本神经科学技术方面的培训。拟议的研究结果将有助于了解MHC 1类限制性抗HIV特异性CD 8 + CTL在控制CNS内HIV-1 RNA病毒载量中的作用，并将有助于了解CSF HIV-1病毒载量与AIDS痴呆综合征发病机制之间的关系。

Recent findings from the applicant's laboratories have demonstrated that decreases in CSF HIV-1 RNA concentration are strongly associated with improvement in neuropsychological test performance. These results provide further evidence for the role of HIV-1 viral load in the pathogenesis of AIDS dementia complex (ADC). The general goal of the collaborative research proposed is to define the role of MHC class I- restricted, anti-HIV-1 specific CD8+ cytotoxic T lymphocyte (CTL) responses in the control of HIV-1 replication within the CNS. Studies are proposed to test the working hypothesis that HIV-associated cognitive impairment is due to loss of control of HIV-1 replication within the CNS, that this loss of control is a consequence of viral escape from CTL responses, and that viral escape from immune control results in selection for unique strains of HIV-1 within the CNS of patients with ADC. The project will be conducted as an integrated and coordinated collaboration between investigators at the University of Hawaii and the University of Washington. The applicant component of the project will focus on characterizing HIV-1-specific CTL responses in the CNS of HIV-1 infected subjects, and determining whether changes in epitotic sequences of CNS-derived HIV-1 strains affect recognition of such epitopes, cognitive dysfunction, and CSF HIV-1 viral load. The hypotheses to be tested in both components are closely interrelated as are the experimental designs, and will allow for the complementary expertise of the investigations to be applied in a maximally productive and mutually beneficial way. The collaboration will also provide ample opportunities for students and fellows at the University of Hawaii to obtain training in the basic neuroscience techniques to be implemented in the conduct of this research efforts. The results of the proposed research will be relevant to understand the role of MHC class 1-restricted, anti-HIV-specific CD8+ CTL in controlling HIV-1 RNA viral load within the CNS, and will contribute to understanding the relationship between CSF HIV-1 viral load and the pathogenesis of AIDS dementia complex.