Nonprogressing HIV-infected children share fundamental immunological features of nonpathogenic SIV infection.

Nonprogressing HIV-infected children share fundamental immunological features of nonpathogenic SIV infection.
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DOI:
10.1126/scitranslmed.aag1048
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发表时间:
2016-09-28
影响因子:
17.1
通讯作者:
Goulder P
Goulder P
中科院分区:
医学1区
文献类型:
--
作者:
Muenchhoff M;Adland E;Karimanzira O;Crowther C;Pace M;Csala A;Leitman E;Moonsamy A;McGregor C;Hurst J;Groll A;Mori M;Sinmyee S;Thobakgale C;Tudor-Williams G;Prendergast AJ;Kloverpris H;Roider J;Leslie A;Shingadia D;Brits T;Daniels S;Frater J;Willberg CB;Walker BD;Ndung'u T;Jooste P;Moore PL;Morris L;Goulder P

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HIV感染成人的无病感染与HLA介导的病毒血症抑制有关,而在SIV的正常白眉猴和其他健康自然宿主中,病毒复制持续不减。为了更好地了解预防HIV疾病的因素,我们在这里调查了儿科感染,其中AIDS通常比成人发展得更快。在170名年龄> 5岁的未接受过抗逆转录病毒治疗的儿童中,CD 4 T细胞计数保持正常,尽管病毒血症较高(中位数为26,000拷贝/ml),但免疫激活水平较低。在大多数受试者中存在有效的广泛中和抗体应答和强病毒特异性T细胞活性,但不会导致儿科非进展。然而,在儿科非进展者中观察到长寿命中央记忆CD 4 T细胞中CCR 5表达降低和HIV感染低。因此,这些儿童表达了非致病性SIV感染的两个主要免疫学特征,即尽管存在高病毒血症,但免疫激活较低,以及长寿命的中央记忆CD 4 T细胞上的CCR 5表达较低,这表明与自然SIV宿主中数千年来进化的非致病机制相比,与HIV感染成人中的非致病机制更相似。
Disease-free infection in HIV-infected adults is associated with HLA-mediated suppression of viremia, whereas in the sooty mangabey and other healthy natural hosts of SIV, viral replication continues unabated. To better understand factors preventing HIV disease, we here investigated pediatric infection, where AIDS typically develops more rapidly than in adults. Among 170 non-progressing anti-retroviral therapy-naïve children aged >5yrs maintaining normal-for-age CD4 T-cell counts, immune activation levels were low despite high viremia (median 26,000 copies/ml). Potent, broadly neutralizing antibody responses in the majority of subjects and strong virus-specific T-cell activity were present but did not drive pediatric non-progression. However, reduced CCR5 expression and low HIV infection in long-lived central memory CD4 T-cells were observed in pediatric non-progressors. These children therefore express two cardinal immunological features of non-pathogenic SIV infection in sooty mangabeys - low immune activation despite high viremia and low CCR5 expression on long-lived central memory CD4 T-cells – suggesting closer similarities with non-pathogenetic mechanisms evolved over thousands of years in natural SIV hosts than those operating in HIV-infected adults.
记忆中的CD4下调CD4+ T细胞体内使非洲绿色猴子具有对进行性Sivagm感染的抗性。
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