Bruton's tyrosine kinase is required for TLR-induced IL-10 production

Nathan W. Schmidt, Vivian T. Thieu, Brandon A. Mann, Ayele Nati N. Ahyi, Mark H. Kaplan

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


Bruton's tyrosine kinase (Btk) is a critical signaling mediator downstream of the B cell Ag receptor. X-linked agammaglobulinemia is caused by mutations in Btk resulting in multiple defects in B cell development and function, and recurrent bacterial infections. Recent evidence has also supported a role for Btk in TLR signaling. We demonstrate that Btk is activated by TLR4 in primary macrophages and is required for normal TLM-ieduced IL-10 production in multiple macrophage populations. Btk-deficient bone marrow-derived macrophages secrete decreased levels of BL-10 in response to multiple TLR ligands, compared with wild-type (WT) cells. Similarly, Btk-deficient peritoneal and splenic macrophages secrete decreased IL-10 levels compared with WT cultures. This phenotype correlates with Btk-dependent induction of NF-κB and AP-1 DNA binding activity, and altered commensal bacteria populations. Decreased IL-10 production may be responsible for increased IL-6 because blocking IL-10 in WT cultures increased IL-6 production, and supplementation of IL-10 to Btk-deficient cultures decreased IL-6 production. Similarly, injection of IL-10 in vivo with LPS decreases the elevated IL-6 serum levels during endotoxemia in Btk-deficient mice. These data further support a role for Btk in regulating TLR-induced cytokine production from APCs and provide downstream targets for analysis of Btk function.

Original languageEnglish (US)
Pages (from-to)7203-7210
Number of pages8
JournalJournal of Immunology
Issue number10
StatePublished - Nov 15 2006

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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