C-Type Lectin Receptor DCAR Recognizes Mycobacterial Phosphatidyl-Inositol Mannosides to Promote a Th1 Response during Infection

Kenji Toyonaga, Shota Torigoe, Yoshitomo Motomura, Takane Kamichi, Jennifer M. Hayashi, Yasu S. Morita, Naoto Noguchi, Yasushi Chuma, Hideyasu Kiyohara, Kazuhiro Matsuo, Hiroshi Tanaka, Yoshiko Nakagawa, Tetsushi Sakuma, Masaki Ohmuraya, Takashi Yamamoto, Masayuki Umemura, Goro Matsuzaki, Yasunobu Yoshikai, Ikuya Yano, Tomofumi MiyamotoSho Yamasaki

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Phosphatidyl-inositol mannosides (PIM) are glycolipids unique to mycobacteria and other related bacteria that stimulate host immune responses and are implicated in mycobacteria pathogenicity. Here, we found that the FcRγ-coupled C-type lectin receptor DCAR (dendritic cell immunoactivating receptor; gene symbol Clec4b1) is a direct receptor for PIM. Mycobacteria activated reporter cells expressing DCAR, and delipidation of mycobacteria abolished this activity. Acylated PIMs purified from mycobacteria were identified as ligands for DCAR. DCAR was predominantly expressed in small peritoneal macrophages and monocyte-derived inflammatory cells in lungs and spleen. These cells produced monocyte chemoattractant protein-1 (MCP-1) upon PIM treatment, and absence of DCAR or FcRγ abrogated MCP-1 production. Upon mycobacterial infection, Clec4b1-deficient mice showed reduced numbers of monocyte-derived inflammatory cells at the infection site, impaired IFNγ production by T cells, and an increased bacterial load. Thus, DCAR is a critical receptor for PIM that functions to promote T cell responses against mycobacteria.

Original languageEnglish
Pages (from-to)1245-1257
Number of pages13
JournalImmunity
Volume45
Issue number6
DOIs
Publication statusPublished - Dec 20 2016

All Science Journal Classification (ASJC) codes

  • Immunology and Allergy
  • Immunology
  • Infectious Diseases

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    Toyonaga, K., Torigoe, S., Motomura, Y., Kamichi, T., Hayashi, J. M., Morita, Y. S., Noguchi, N., Chuma, Y., Kiyohara, H., Matsuo, K., Tanaka, H., Nakagawa, Y., Sakuma, T., Ohmuraya, M., Yamamoto, T., Umemura, M., Matsuzaki, G., Yoshikai, Y., Yano, I., ... Yamasaki, S. (2016). C-Type Lectin Receptor DCAR Recognizes Mycobacterial Phosphatidyl-Inositol Mannosides to Promote a Th1 Response during Infection. Immunity, 45(6), 1245-1257. https://doi.org/10.1016/j.immuni.2016.10.012