HIV-1gp120蛋白对人血-视网膜屏障细胞的毒性作用  被引量:1

Cytotoxity of HIV-1 gpl20 protein on human blood-retinal barrier cells

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作  者:林浩添[1] 张振平[1] 余秋蓉[1] 晏丕松[1] 汪琪磷[1] 柏凌[1] 

机构地区:[1]中山大学中山眼科中心眼科学周家重点实验室,广州510060

出  处:《中华生物医学工程杂志》2009年第1期20-26,共7页Chinese Journal of Biomedical Engineering

基  金:国家自然科学基金(30471851);广东省科技计划项目(20088060600026)

摘  要:目的探索HIV-1gp120蛋白侵犯人血-视网膜屏障的机制。方法原代培养人血-视网膜屏障细胞(HBRBC),包括人视网膜微血管内皮细胞(HRCEC)、人视网膜微血管周细胞(HRCPC)、人视网膜色素上皮细胞(HRPE),以培养基作为对照。用MTT法观察7种不同浓度(0.01~0.15mg/L)的HIV-1gp120蛋白作用24h和0.08mg/LHIV-1gp120蛋白作用不同时间(4~72h)对3种细胞的生长抑制作用。0.08、0.1、0.12、0.15mg/L的HIV-1lgp120蛋白作用24h后,用流式细胞仪检测其对3种细胞凋亡率和线粒体膜电位(△ψm)的影响;用Western免疫印迹检测Cleavedcaspase-9蛋白的活化情况。用透射电镜观察经0.08mg/LHIV-1gp120蛋白处理24h前后3种细胞超微结构的变化。结果HIV-1gp120蛋白作用24h,低浓度(〈0.08mg/L)对3种细胞的活性均没有明显影响,而当浓度超过0.08mg/L时,对细胞的增殖活性有明显的抑制作用,呈浓度依赖性(HRCEC:r=-0.763,P〈0.01;HRCPC:r=-0.804,P〈0.01;HRPE:r=-0.698,P〈0.01)。HIV-1gp120蛋白(0.08mg/L)作用12h即可显著抑制细胞的增殖活性,24、48和72h抑制效应更明显,相对增殖率分别为HRCEC:84%、70%、41%、22%,HRCPC:80%、69%、38%、18%,HRPE:86%、73%、45%、26%,抑制效应呈时间依赖性(HRCEC:r=-0.833,P〈0.01;HRCPC:r=-0.784,P〈0.01;HRPE:r=-0.701,P〈0.01)。HIV-1gp120蛋白作用24h后与对照组相比,各浓度组3种细胞凋亡率增加、△ψm明显降低以及Cleavedeaspase-9蛋白表达增强,均呈浓度依赖性。透射电镜示0.08mg/LHIV-1gp120蛋白处理24h后,3种细胞均出现了线粒体肿胀、溶酶体增多等早期凋亡的微观改变。结论HIV-1gp120蛋白能够抑制人血-视网膜屏障细胞的增殖并具有诱导凋亡的作用,破坏线粒体的结构和功能是其可能的机制。Objective To study the mechanism of human blood-retina barrier (BRB) destroyed by HIV-1 gpl20 protein. Methods Human blood-retina barrier cells (HBRBCs) including human retina capillary endothelial cells (HRCECs) , human retina capillary perieytes ( HRCPCs), human retinal pigment epithelium (HRPE) were primarily cultured. Culture media were regarded as control. MTT method was used to observe the inhibition effect of HIV-1 gpl20 protein on cell viability at 7 different concentrations (0.01 to 0.15 rag/L) for 24 h, and at a fixed concentration(0.08 mg/L) for different times (4-72 h). After 0.08, 0.1, 0.12 and 0.15 mg/L HIV-1 gpl20 protein were applied in those cells for 24 h, cell apoptotie rates and membrane potential of mitoehondria ( △ψ m) were measured by flow cytometry. Activation of Cleaved caspase-9 was detected by Western blot. Change of cell microstructure with 0.08mg/L HIV-1 gpl20 protein before and after 24 h was detected by transmission electron microscopy (TEM). Results Concentration of HIV-1 gpl20 protein less than 0.08 mg/L did not influence cell viability at 24 h. But at the concentration of more than 0.08 mg/L, HIV-1 gpl20 protein could obviously inhibit HBRBCs proliferation with a concentration- dependent manner(HRCECs: r=-0.763, P〈0.01; HRCPCs: r=-0.804, P〈0.01 ; HRPE: r=-0.698, P〈0.01). HIV-1 gpl20 protein(0.08 mg/L) significantly inhibited cells proliferation at 12 h, and this inhibition effect was more stronger at 24,48,72 h with a time-dependent increase(HRCECs: r=-0.833, P〈0.01 ; HRCPCs: r=-0.784, P〈0.01 ; HRPE: r=-0.701, P〈0.01 ). The relative growth rates were HRCECs: 84%, 70%, 41%, 22%; HRCPCs: 80%, 69%, 38%, 18%; HRPE: 86%, 73%, 45%, 26% respectively. Compared with control group, the ratio of apoptotic cells of HBRBCs and expression level of Cleaved caspase-9 protein increased but △ψm decreased at different concentrations with HIV-1 gpl20 protein treatment for 24 h. The changes of these indexes were a

关 键 词:HIV包膜蛋白质gpl20 血视网膜屏障 细胞毒性实验 细胞凋亡 获得性免 疫缺陷综合征 

分 类 号:R774[医药卫生—眼科] R512.91[医药卫生—临床医学]

 

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