Inflammatory Monocytes Recruited to Allergic Skin Acquire an Anti-inflammatory M2 Phenotype via Basophil-Derived Interleukin-4

Mayumi Egawa, Kaori Mukai, Soichiro Yoshikawa, Misako Iki, Naofumi Mukaida, Yohei Kawano, Yoshiyuki Minegishi, Hajime Karasuyama

Research output: Contribution to journalArticle

153 Citations (Scopus)


Monocytes and macrophages are important effectors and regulators of inflammation, and both can be divided into distinct subsets based on their phenotypes. The developmental and functional relationship between individual subsets of monocytes and those of macrophages has not been fully elucidated, although Ly6C+CCR2+ inflammatory and Ly6C-CCR2- resident monocytes are generally thought to differentiate into M1 (classically activated) and M2 (alternatively activated) macrophages, respectively. Here we show that inflammatory monocytes recruited to allergic skin acquired an M2-like phenotype in response to basophil-derived interleukin-4 (IL-4) and exerted an anti-inflammatory function. CCR2-deficient mice unexpectedly displayed an exacerbation rather than alleviation of allergic inflammation, in spite of impaired recruitment of inflammatory monocytes to skin lesions. Adoptive transfer of inflammatory monocytes from wild-type but not IL-4 receptor-deficient mice dampened the exacerbated inflammation in CCR2-deficient mice. Thus, inflammatory monocytes can be converted from being proinflammatory to anti-inflammatory under the influence of basophils in allergic reactions.

Original languageEnglish
Pages (from-to)570-580
Number of pages11
Issue number3
Publication statusPublished - Mar 21 2013
Externally publishedYes


ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Infectious Diseases

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