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Science:注射強力抗體抑制血液中HIV病毒
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12月23日,來自美國NIH的科學家們在國際學術(shù)期刊上發(fā)表了一項最新研究進展,他們報告稱注射一種叫做VRC01的強效抗體就能夠抑制未接受抗逆轉(zhuǎn)錄病毒治療的HIV攜帶者血液中的HIV病毒水平。研究人員還發(fā)現(xiàn)通過靜脈注射或皮下注射方式將VRC01抗體注入病毒攜帶者體內(nèi)具有非常好的安全性和耐受性,并且注入的抗體能夠在病人血液中保持較長時間。 Virologic effects of broadly neutralizing antibody VRC01 administration during chronic HIV-1 infection http://stm.sciencemag.org/content/7/319/319ra206 Passive aggression for HIV Antibodies that neutralize HIV could add to the therapeutic arsenal to prevent and treat disease. Lynch et al. have now tested one such antibody—VRC01—in HIV-infected individuals. Although little difference was observed in viral reservoir in individuals on antiretroviral therapy, plasma viremia was reduced in untreated subjects with a single infusion of VRC01, preferentially suppressing neutralization-sensitive strains. Passive immunization with neutralizing antibodies could therefore aid in viral suppression in HIV-infected individuals. Abstract Passive immunization with HIV-1–neutralizing monoclonal antibodies (mAbs) is being considered for prevention and treatment of HIV-1 infection. As therapeutic agents, mAbs could be used to suppress active virus replication, maintain suppression induced by antiretroviral therapy (ART), and/or decrease the size of the persistent virus reservoir. We assessed the impact of VRC01, a potent human mAb targeting the HIV-1 CD4 binding site, on ART-treated and untreated HIV-1–infected subjects. Among six ART-treated individuals with undetectable plasma viremia, two infusions of VRC01 did not reduce the peripheral blood cell–associated virus reservoir measured 4 weeks after the second infusion. In contrast, six of eight ART-untreated, viremic subjects infused with a single dose of VRC01 experienced a 1.1 to 1.8 log10 reduction in plasma viremia. The two subjects with minimal responses to VRC01 were found to have predominantly VRC01-resistant virus before treatment. Notably, two subjects with plasma virus load <1000 copies/ml demonstrated virus suppression to undetectable levels for over 20 days until VRC01 levels declined. Among the remaining four subjects with baseline virus loads between 3000 and 30,000 copies, viremia was only partially suppressed by mAb infusion, and we observed strong selection pressure for the outgrowth of less neutralization-sensitive viruses. In summary, a single infusion of mAb VRC01 significantly decreased plasma viremia and preferentially suppressed neutralization-sensitive virus strains. These data demonstrate the virological effect of this neutralizing antibody and highlight the need for combination strategies to maintain virus suppression. |
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