不同感染时间与感染途径的HIV-1感染者全基因组CTL免疫反应比较研究

目的 分析研究不同感染时间和不同途径感染HIV/AIDS感染者覆盖全基因组的CTL应答特征.方法 将75例HIV/AIDS感染者分为3组,血液感染1～2年组(10例)、血液感染＞10年组(43例)和性接触感染1～2年组(22例);以HIV-1 B亚型构建全基因组17个肽库作为抗原,采用ELISpot检测各组HIV特异性CTL应答;采用流式细胞术检测各组CD4计数;采用实时定量RT-PCR检测各组HIV病毒载量.结果 血液感染1～2年组、血液感染＞10年组和性接触感染1～2年组感染者对HIV-B亚型17个肽库的平均应答频率分别为40%、65%、23%,经单向方差分析,3组感染者对HIV-1 B亚型17个肽库的应答频率差异有统计学意义(F=19.96,P＜0.01);3组感染者对HIV-B亚型17个肽库总应答强度范围分别为0～5 835 SFCs/106 PBMC、0～7 225 SFCs/106PBMC、0～9 740 SFCs/106PBMC,且3组感染者对HIV-B亚型17个肽库的应答强度差异亦有统计学意义(H=101.90,P＜0.01);此外,3组感染者对HIV-1 B亚型17个肽库的应答广度分别为7(2～11)个、11(9～14)个、4(2～6)个,3组感染者应答广度的差异也有统计学意义(H=34.75,P＜0.01).3组感染者应答频率、应答强度和应答广度从高到低依次为血液感染＞10年组、血液感染1～2年组、性接触感染1～2年组.不同感染时间和不同感染途径的感染者对Nef肽库和Gag肽库的应答百分比和应答强度均高于其他肽库.CD4计数＜200/μl、CD4计数为200～500/μl和≥500/μl3组感染者对17个肽库的总应答强度范围分别为0～18 475 SFCs/106 PBMC、350～34 095 SFCs/106PBMC、490～21 550 SFCs/106 PBMC,但差异无统计学意义(H=2.93,P=0.23);3组感染者CTL应答广度分别为3(0～8)个、10(2～17)个、10(1～17)个,3组间差异有统计学意义(H=14.72,P＜0.01),CD4计数＜200/μl的感染者CTL应答广度低于CD4计数为200～500/μl和≥500/μl组.不同病毒载量3组(＜LDL、LDL-1×104拷贝/ml和≥1×104拷贝/ml)标本对17个肽库的总应答强度范围分别为490～18 475 SFCs/106PBMC、0～24 115 SFCs/106PBMC、770～34 095 SFCs/106 PBMC,但3组间差异无统计学意义(H=0.79,P=0.67);应答广度分别为8(1～17)个、11(0～17)个、8(1～16)个,3组间差异也无统计学意义(H=5.27,P=0.07).结论 中国HIV/AIDS感染者中CTL应答多集中在Nef和Gag,这两个抗原为HIV/AIDS感染的优势抗原;感染时间和感染途径对CTL应答可产生显著影响;随感染时间的延长,免疫反应的强度与应答比例均增加.这些信息对设计针对中国人群的AIDS疫苗有较重要意义.

Abstract：

Objective To investigate and compare the features of the HIV-1-specific CTL responses among three HIV-infected groups with varied infection history. Methods Three HIV-infeeted groups were enrolled in this study, including two groups infected by blood transmission (one group has been infected for more than 10 years and the other for 1-2 years) and one group of the man who have sex with man. The HIV-1-specific CTL responses were quantified by an IFN-γ based ELISPot assay with a peptide matrix system containing overlapping peptides spanning the entire HIV-1 Clade B genomic consensus sequences. Results The responding rate of CTL responses against all 17 peptide pools among the group that infected 1-2 years,the group infected more than 10 years and the group of MSM were 40% ,65% ,23%. One way ANOVO analysis showed that the responding rate of CTL responses against all 17 peptide pools were statistical significant among the three groups (F=19.96, P＜0.01);the magnitude of CTL responses of the three groups were 0-5 835 SFCs/106 PBMC, 0-7 225 SFCs/106PBMC, 0-9 740SFCs/106pBMC, Kruskal-Wallis test showed that the magnitude of CTL responses were statistical significant among the three groups( H = 101.90 , P ＜0.01);the breadth of CTL were 7 ( 2-11 ), 11(9-14) and 4 (2-6) respectively and Kruskal- Wallis test showed that the breadth of CTL had no statistical significant among the three groups( H = 34. 75 ,P ＜0. 01 ). The sequence of responding rate, magnitude and breadth of CTL from high to low was the group that had been infected for more than 10 years, the group infected 1-2 years and the sex transmission group. The common characteristics of the CTL response among the three groups were that the responding rate and the magnitude of the peptide Nef and Gag was higher than other peptide's. The magnitude of CTL responses among three different CD4count groups (CD4 ＜ 200/μl, CD4 200-500/μl, CD4 ≥500/μl,) was 0-18 475 SFCs/106pBMC, 350-34 095 SFCs/106pBMC, 490-21 550 SFCs/106 PBMC and had no statistic difference among the three different CD4 groups(H=2.93, P=0.23) while the breadth of CTL was 3(0-8), 10(2-17), 10 (1-17)respoctively and the breadth of CTL was lower in the group of CD4 count less than 200/μl than the other two groups( H = 14. 72, P ＜ 0. 01 ). The magnitude of CTL responses among three different viral load (VL)groups (VL＜ LDL, LDL ＜ VL ＜ 1 × 104 copys/ml, VL≥1 ×104 copys/ml) was 490-18 475 SFCs/106pBMC, 0-24 115 SFCs/106pBMC, 770-34 095 SFCs/106 pBMC and had no statistic difference among the three different viral load groups ( H = 0.79, P=0.67) and the breadth of the three different viral load groups CTL was 8( 1-17), 11 (0-17), 8 (1-16) and Kruskal-Wallis test showed that there was no statistic difference among the three different viral load groups (H =5.27, P =0. 07). Conclusions All groups predominantly develope T cell immune responses against Nef and Gag proteins. With the elapse of HIV infection, the CTL responses are increased in both magnitude and responding rate. This information is important for vaccine development.

Cross-genome HIV-specific cytotoxic T-lymphocyte responses among HIV-1 infected individuals with varied infection time and routes

Objective To investigate and compare the features of the HIV-1-specific CTL responses among three HIV-infected groups with varied infection history. Methods Three HIV-infeeted groups were enrolled in this study, including two groups infected by blood transmission (one group has been infected for more than 10 years and the other for 1-2 years) and one group of the man who have sex with man. The HIV-1-specific CTL responses were quantified by an IFN-γ based ELISPot assay with a peptide matrix system containing overlapping peptides spanning the entire HIV-1 Clade B genomic consensus sequences. Results The responding rate of CTL responses against all 17 peptide pools among the group that infected 1-2 years,the group infected more than 10 years and the group of MSM were 40% ,65% ,23%. One way ANOVO analysis showed that the responding rate of CTL responses against all 17 peptide pools were statistical significant among the three groups (F=19.96, P＜0.01);the magnitude of CTL responses of the three groups were 0-5 835 SFCs/106 PBMC, 0-7 225 SFCs/106PBMC, 0-9 740SFCs/106pBMC, Kruskal-Wallis test showed that the magnitude of CTL responses were statistical significant among the three groups( H = 101.90 , P ＜0.01);the breadth of CTL were 7 ( 2-11 ), 11(9-14) and 4 (2-6) respectively and Kruskal- Wallis test showed that the breadth of CTL had no statistical significant among the three groups( H = 34. 75 ,P ＜0. 01 ). The sequence of responding rate, magnitude and breadth of CTL from high to low was the group that had been infected for more than 10 years, the group infected 1-2 years and the sex transmission group. The common characteristics of the CTL response among the three groups were that the responding rate and the magnitude of the peptide Nef and Gag was higher than other peptide's. The magnitude of CTL responses among three different CD4count groups (CD4 ＜ 200/μl, CD4 200-500/μl, CD4 ≥500/μl,) was 0-18 475 SFCs/106pBMC, 350-34 095 SFCs/106pBMC, 490-21 550 SFCs/106 PBMC and had no statistic difference among the three different CD4 groups(H=2.93, P=0.23) while the breadth of CTL was 3(0-8), 10(2-17), 10 (1-17)respoctively and the breadth of CTL was lower in the group of CD4 count less than 200/μl than the other two groups( H = 14. 72, P ＜ 0. 01 ). The magnitude of CTL responses among three different viral load (VL)groups (VL＜ LDL, LDL ＜ VL ＜ 1 × 104 copys/ml, VL≥1 ×104 copys/ml) was 490-18 475 SFCs/106pBMC, 0-24 115 SFCs/106pBMC, 770-34 095 SFCs/106 pBMC and had no statistic difference among the three different viral load groups ( H = 0.79, P=0.67) and the breadth of the three different viral load groups CTL was 8( 1-17), 11 (0-17), 8 (1-16) and Kruskal-Wallis test showed that there was no statistic difference among the three different viral load groups (H =5.27, P =0. 07). Conclusions All groups predominantly develope T cell immune responses against Nef and Gag proteins. With the elapse of HIV infection, the CTL responses are increased in both magnitude and responding rate. This information is important for vaccine development.