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Macrophage polarization to a unique phenotype driven by B cells
Author(s) -
Wong SiewCheng,
Puaux AnneLaure,
Chittezhath Manesh,
Shalova Irina,
Kajiji Tasneem S.,
Wang Xiaojie,
Abastado JeanPierre,
Lam KongPeng,
Biswas Subhra K.
Publication year - 2010
Publication title -
european journal of immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.272
H-Index - 201
eISSN - 1521-4141
pISSN - 0014-2980
DOI - 10.1002/eji.200940288
Subject(s) - biology , innate immune system , trif , macrophage polarization , microbiology and biotechnology , immune system , adoptive cell transfer , acquired immune system , phenotype , tumor necrosis factor alpha , interleukin 12 , t cell , cancer research , immunology , in vitro , macrophage , cytotoxic t cell , genetics , toll like receptor , gene
Abstract Regulation of adaptive immunity by innate immune cells is widely accepted. Conversely, adaptive immune cells can also regulate cells of the innate immune system. Here, we report for the first time the essential role of B cells in regulating macrophage (Mϕ) phenotype. In vitro B cell/Mϕ co‐culture experiments together with experiments in transgenic mice models for B‐cell deficiency or overexpression showed B1 cells to polarize Mϕ to a distinct phenotype. This was characterized by downregulated TNF‐α, IL‐1β and CCL3, but upregulated IL‐10 upon LPS stimulation; constitutive expression of M2 Mϕ markers ( e.g. Ym1 , Fizz1 ) and overexpression of TRIF‐dependent cytokines (IFN‐β, CCL5). Mechanistically, this phenotype was linked to a defective NF‐κB activation, but a functional TRIF/STAT1 pathway. B1‐cell‐derived IL‐10 was found to be instrumental in the polarization of these Mϕ. Finally, in vivo relevance of B1‐cell‐induced Mϕ polarization was confirmed using the B16 melanoma tumor model where adoptive transfer of B1 cells induced an M2 polarization of tumor‐associated Mϕ. Collectively, our results define a new mechanism of Mϕ polarization wherein B1 cells play a key role in driving Mϕ to a unique, but M2‐biased phenotype. Future studies along these lines may lead to targeting of B1 cells to regulate Mϕ response in inflammation and cancer.