OBJECTIVE:This study investigated the impact on virological outcome of the gag cleavage sites and the protease-coding region mutations in protease inhibitor-naive and protease inhibitor-experienced patients infected with HIV-2 receiving lopinavir (LPV) containing regimen. METHODS:Baseline gag and protease-coding region were sequenced in 46 HIV-2 group A-infected patients receiving lopinavir. Virological response was defined as plasma viral load less than 100 copies/ml at month 3. Associations between virological response and frequencies of mutations in gag [matrix/capsid (CA), CA/p2, p2/nucleocapsid (NC), NC/p1, p1/p6] and gag-pol (NC/p6) cleavage site and protease-coding region, with respect to the HIV-2ROD strain, were tested using Fisher's exact test. RESULTS:Virological response occurred in 14 of 17 (82%) protease inhibitor-naive and 17 of 29 (59%) protease inhibitor-experienced patients. Virological failure was associated with higher baseline viral load (median: 6765 versus 1098 copies/ml, P = 0.02). More protease-coding region mutations were observed in protease inhibitor-experienced compared with protease inhibitor-naive patients (median: 8 versus 5, P = 0.003). In protease inhibitor-naive patients, T435A (NC/p6), V447M (p1/p6), and Y14H (protease-coding region) were associated with virological failure (P = 0.011, P = 0.033, P = 0.022, respectively). T435A and V447M were associated with Y14H (P = 0.018, P = 0.039, respectively). In protease inhibitor-experienced patients, D427E (NC/p1) was associated with virological response (P = 0.014). A430V (NC/p1) and I82F (protease-coding region) were associated with virological failure (P = 0.046, P = 0.050, respectively). Mutations at position 430 were associated with a higher number of mutations in protease-coding region (median: 10 versus 7, P = 0.008). CONCLUSION:We have demonstrated, for the first time, an association between gag, gag-pol cleavage site and protease-coding region mutations, with distinct profiles between protease inhibitor-naive and protease inhibitor-experienced patients. These mutations might impact the virological outcome of HIV-2-infected patients receiving LPV-containing regimen.

译文

目的:本研究调查了接受含洛匹那韦(LPV)治疗的HIV-2感染蛋白酶-2的未受蛋白酶抑制剂和经验丰富的蛋白酶抑制剂的患者对gag裂解位点的病毒学结果和蛋白酶编码区突变的影响。
方法:对46名接受洛匹那韦的HIV-2 A组感染患者的基线gag和蛋白酶编码区进行测序。病毒学应答定义为在第3个月血浆病毒载量小于100拷贝/ ml。病毒学应答与gag突变频率之间的关联[基质/衣壳(CA),CA / p2,p2 /核衣壳(NC),NC / p1 ,p1 / p6]和gag-pol(NC / p6)切割位点和蛋白酶编码区,针对HIV-2ROD菌株,使用Fisher精确检验进行了测试。
结果:病毒学应答发生在17例(82%)未使用蛋白酶抑制剂的患者中,有14例发生在29例(59%)使用蛋白酶抑制剂的患者中。病毒学衰竭与较高的基线病毒载量有关(中位数:6765对1098拷贝/ ml,P = 0.02)。与未使用蛋白酶抑制剂的患者相比,在有蛋白酶抑制剂经验的患者中观察到更多的蛋白酶编码区域突变(中位数:8对5,P = 0.003)。在未使用蛋白酶抑制剂的患者中,T435A(NC / p6),V447M(p1 / p6)和Y14H(蛋白酶编码区)与病毒学失败有关(分别为P = 0.011,P = 0.033,P = 0.022)。 T435A和V447M与Y14H相关(分别为P = 0.018,P = 0.039)。在有蛋白酶抑制剂经验的患者中,D427E(NC / p1)与病毒学应答有关(P = 0.014)。 A430V(NC / p1)和I82F(蛋白酶编码区)与病毒学失败有关(分别为P = 0.046,P = 0.050)。位置430的突变与蛋白酶编码区中更高数量的突变相关(中位数:10对7,P = 0.008)。
结论:我们首次证明了gag,gag-pol切割位点和蛋白酶编码区突变之间的相关性,其中未使用蛋白酶抑制剂的患者和有蛋白酶抑制剂经验的患者之间存在明显的差异。这些突变可能会影响接受含LPV方案的HIV-2感染患者的病毒学结果。

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