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Disruption of an antimycobacterial circuit between dendritic and helper T cells in human SPPL2a deficiency

Lookup NU author(s): Professor Sophie HambletonORCiD

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Abstract

© 2018, The Author(s). Human inborn errors of IFN-γ immunity underlie mycobacterial diseases. We describe patients with Mycobacterium bovis (BCG) disease who are homozygous for loss-of-function mutations of SPPL2A. This gene encodes a transmembrane protease that degrades the N-terminal fragment (NTF) of CD74 (HLA invariant chain) in antigen-presenting cells. The CD74 NTF therefore accumulates in the HLA class II+ myeloid and lymphoid cells of SPPL2a-deficient patients. This toxic fragment selectively depletes IL-12- and IL-23-producing CD1c+ conventional dendritic cells (cDC2s) and their circulating progenitors. Moreover, SPPL2a-deficient memory TH1* cells selectively fail to produce IFN-γ when stimulated with mycobacterial antigens in vitro. Finally, Sppl2a–/– mice lack cDC2s, have CD4+ T cells that produce small amounts of IFN-γ after BCG infection, and are highly susceptible to infection with BCG or Mycobacterium tuberculosis. These findings suggest that inherited SPPL2a deficiency in humans underlies mycobacterial disease by decreasing the numbers of cDC2s and impairing IFN-γ production by mycobacterium-specific memory TH1* cells.

Publication metadata

Author(s): Kong X-F, Martinez-Barricarte R, Kennedy J, Mele F, Lazarov T, Deenick EK, Ma CS, Breton G, Lucero KB, Langlais D, Bousfiha A, Aytekin C, Markle J, Trouillet C, Jabot-Hanin F, Arlehamn CSL, Rao G, Picard C, Lasseau T, Latorre D, Hambleton S, Deswarte C, Itan Y, Abarca K, Moraes-Vasconcelos D, Ailal F, Ikinciogullari A, Dogu F, Benhsaien I, Sette A, Abel L, Boisson-Dupuis S, Schroder B, Nussenzweig MC, Liu K, Geissmann F, Tangye SG, Gros P, Sallusto F, Bustamante J, Casanova J-L

Publication type: Article

Publication status: Published

Journal: Nature Immunology

Year: 2018

Volume: 19

Issue: 9

Pages: 973-985

Print publication date: 01/09/2018

Online publication date: 20/08/2018

Acceptance date: 02/07/2018

ISSN (print): 1529-2908

ISSN (electronic): 1529-2916

Publisher: Nature Publishing Group

URL: https://doi.org/10.1038/s41590-018-0178-z

DOI: 10.1038/s41590-018-0178-z

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