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    We describe a novel B cell-associated cytokine, encoded by an uncharacterized gene (C17orf99; chromosome 17 open reading frame 99), that is expressed in bone marrow and fetal liver and whose expression is also induced in peripheral B cells upon activation. C17orf99 is only present in mammalian genomes, and it encodes a small (∼27-kDa) secreted protein unrelated to other cytokine families, suggesting a function in mammalian immune responses. Accordingly, C17orf99 expression is induced in the mammary gland upon the onset of lactation, and a C17orf99-/- mouse exhibits reduced levels of IgA in the serum, gut, feces, and lactating mammary gland. C17orf99-/- mice have smaller and fewer Peyer's patches and lower numbers of IgA-secreting cells. The microbiome of C17orf99-/- mice exhibits altered composition, likely a consequence of the reduced levels of IgA in the gut. Although naive B cells can express C17orf99 upon activation, their production increases following culture with various cytokines, including IL-4 and TGF-β1, suggesting that differentiation can result in the expansion of C17orf99-producing B cells during some immune responses. Taken together, these observations indicate that C17orf99 encodes a novel B cell-associated cytokine, which we have called IL-40, that plays an important role in humoral immune responses and may also play a role in B cell development. Importantly, IL-40 is also expressed by human activated B cells and by several human B cell lymphomas. The latter observations suggest that it may play a role in the pathogenesis of certain human diseases. Copyright © 2017 by The American Association of Immunologists, Inc.

    Citation

    Jovani Catalan-Dibene, Monica I Vazquez, Van Phi Luu, Sean-Paul Nuccio, Alborz Karimzadeh, Jenna M Kastenschmidt, S Armando Villalta, Irina Ushach, Egest J Pone, Paolo Casali, Manuela Raffatellu, Amanda M Burkhardt, Marcela Hernandez-Ruiz, Gina Heller, Peter A Hevezi, Albert Zlotnik. Identification of IL-40, a Novel B Cell-Associated Cytokine. Journal of immunology (Baltimore, Md. : 1950). 2017 Nov 01;199(9):3326-3335

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    PMID: 28978694

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