A non-canonical type 2 immune response coordinates tuberculous granuloma formation and epithelialization.

A non-canonical type 2 immune response coordinates tuberculous granuloma formation and epithelialization.
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DOI:
10.1016/j.cell.2021.02.046
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发表时间:
2021-04-01
期刊:
影响因子:
64.5
通讯作者:
Tobin DM
Tobin DM
中科院分区:
生物学1区
文献类型:
--
作者:
Cronan MR;Hughes EJ;Brewer WJ;Viswanathan G;Hunt EG;Singh B;Mehra S;Oehlers SH;Gregory SG;Kaushal D;Tobin DM

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The central pathogen-immune interface in tuberculosis is the granuloma, a complex host immune structure that dictates infection trajectory and physiology. Granuloma macrophages undergo a dramatic transition in which entire epithelial modules are induced and define granuloma architecture. In tuberculosis, relatively little is known about the host signals that trigger this transition. Using the zebrafish-Mycobacterium marinum model, we identify the basis of granuloma macrophage transformation. Single-cell RNA-seq analysis of zebrafish granulomas as well as analysis of Mycobacterium tuberculosis-infected macaques reveal that, even in the presence of robust type 1 immune responses, countervailing type 2 signals associate with macrophage epithelialization. We find that type 2 immune signaling, mediated via stat6, is absolutely required for epithelialization and granuloma formation. In mixed chimeras, stat6 acts cell-autonomously within macrophages, where it is required for epithelioid transformation and incorporation into necrotic granulomas. These findings establish the signaling pathway that produces the hallmark structure of mycobacterial infection. During mycobacterial infections, a non-canonical type 2 immune response underlies the formation and epithelial architecture of the granuloma, the hallmark structure of tuberculosis.
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