HIV 相关神经认知障碍患者额皮质细胞中核和线粒体 DNA 损伤的积累。
Accumulation of nuclear and mitochondrial DNA damage in the frontal cortex cells of patients with HIV-associated neurocognitive disorders.
机构信息
Department of Medicine, Beijing You An Hospital, Capital Medical University, Beijing 100069, China.
出版信息
Brain Res. 2012 Jun 6;1458:1-11. doi: 10.1016/j.brainres.2012.04.001. Epub 2012 Apr 11.
Oxidative stress has been suggested to play a key role in the neuropathogenesis of HIV infection. HIV proteins (gp120, Tat) and proinflammatory cytokines can trigger the production of reactive oxygen species (ROS), resulting in DNA and RNA lesions. Among all the lesions induced by ROS, one of the most abundant lesions in DNA and RNA is 8-hydroxydeoxyguanosine (8-oxoG). Here, we studied accumulated DNA oxidative damage induced by ROS in the central nervous system (CNS) in tissue from neuro-AIDS patients. The frontal cortex of autopsy tissue from HIV-1 infected patients was adopted for analysis for HIV-1 subtype, nuclear and mitochondrial DNA lesions by immunofluorescence staining, qPCR and sequencing of PCR cloning. This study provides evidence that HIV infection in the CNS leads to nuclear and mitochondrial genomic DNA damage in the brain. High level of nuclear and mtDNA 8-oxoG damage were identified in the cortex autopsy tissue of HAND patients. Increased accumulation of mtDNA mutations and depletion occurs in brain tissue in a subset of HAND cases, and is significantly different from that observed in control cases. These findings suggest that higher level of ROS in the CNS of HAND patients would contribute to the HIV induced neuro-inflammation and apoptosis of neuronal and glial cells.
氧化应激被认为在 HIV 感染的神经发病机制中起关键作用。HIV 蛋白(gp120、Tat)和促炎细胞因子可触发活性氧(ROS)的产生,导致 DNA 和 RNA 损伤。在 ROS 诱导的所有损伤中,DNA 和 RNA 中最丰富的损伤之一是 8-羟基脱氧鸟苷(8-oxoG)。在这里,我们研究了 HIV-1 感染患者脑组织中 ROS 诱导的中枢神经系统(CNS)中累积的 DNA 氧化损伤。采用 HIV-1 感染患者尸检组织的额叶皮层进行分析,通过免疫荧光染色、qPCR 和 PCR 克隆测序分析 HIV-1 亚型、核和线粒体 DNA 损伤。本研究提供的证据表明,HIV 感染 CNS 会导致大脑中核和线粒体基因组 DNA 损伤。在 HAND 患者的大脑皮层尸检组织中发现高水平的核和 mtDNA 8-oxoG 损伤。在 HAND 病例的一部分中,观察到 mtDNA 突变的积累增加和耗竭,与对照组明显不同。这些发现表明,HAND 患者 CNS 中更高水平的 ROS 将导致 HIV 诱导的神经元和神经胶质细胞的神经炎症和细胞凋亡。