The impact of HIV infection on the frequencies, function, spatial localization and heterogeneity of T follicular regulatory cells (TFRs) within human lymph nodes.

The impact of HIV infection on the frequencies, function, spatial localization and heterogeneity of T follicular regulatory cells (TFRs) within human lymph nodes.
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HIV感染对人淋巴结内T滤泡调节细胞(TFRs)的频率、功能、空间定位和异质性的影响

DOI:
10.1186/s12865-022-00508-1
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发表时间:
2022-07-01
期刊:
影响因子:
3
通讯作者:
Ndhlovu, Zaza M.
Ndhlovu, Zaza M.
中科院分区:
医学4区
文献类型:
--
作者:
Mahlobo, Bongiwe;Laher, Faatima;Smidt, Werner;Ogunshola, Funsho;Khaba, Trevor;Nkosi, Thandeka;Mbatha, Anele;Ngubane, Thandekile;Dong, Krista;Jajbhay, Ismail;Pansegrouw, Johan;Ndhlovu, Zaza M.

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根除艾滋病毒的努力一直不成功,部分原因是病毒在免疫庇护所(如淋巴结组织内的生发中心)中持续存在。最近的证据表明,卵泡调节性T细胞(滤泡调节性T细胞,TFRs)是一种新的调节性T细胞亚群,但它们在HIV发病机制中的作用尚未完全阐明。研究人员对20名未感染HIV的患者和31名接受治疗的HIV感染患者以及7名慢性未接受治疗的患者的LN和外周血样本进行配对切除,以确定HIV感染是否以及如何调节LN组织中tfr的频率、功能和空间定位。影像学研究显示,大多数tfr局限于滤泡外区域。共培养实验表明,TFRs抑制TFH对B细胞有帮助。重要的是,表观遗传学和转录研究发现,DPP4和FCRL3是一种新的表型标记,可以定义人类LNs中四个功能不同的TFR亚群,而不管HIV状态如何。影像学研究证实了DPP4+ tfr的调节性表型。这些研究共同描述了HIV感染期间TFR的动态变化,并揭示了以前未被重视的人类LNs中TFR的异质性。在线版本包含补充材料,可在10.1186/s12865-022-00508-1获得。
HIV eradication efforts have been unsuccessful partly due to virus persistence in immune sanctuary sites such as germinal centres within lymph node (LN) tissues. Recent evidence suggests that LNs harbour a novel subset of regulatory T cells, termed follicular regulatory T cells (TFRs), but their role in HIV pathogenesis is not fully elucidated. Paired excisional LN and peripheral blood samples obtained from 20 HIV-uninfected and 31 HIV-infected treated and 7 chronic untreated, were used to determine if and how HIV infection modulate frequencies, function and spatial localization of TFRs within LN tissues. Imaging studies showed that most TFRs are localized in extra-follicular regions. Co-culture assays showed TFRs suppression of TFH help to B cells. Importantly, epigenetic and transcriptional studies identified DPP4 and FCRL3 as novel phenotypic markers that define four functionally distinct TFR subpopulations in human LNs regardless of HIV status. Imaging studies confirmed the regulatory phenotype of DPP4+TFRs. Together these studies describe TFRs dynamic changes during HIV infection and reveal previously underappreciated TFR heterogeneity within human LNs. The online version contains supplementary material available at 10.1186/s12865-022-00508-1.
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