Sepsis induces incomplete M2 phenotype polarization in peritoneal exudate cells in mice

作者：Nobuo Watanabe, Yusuke Suzuki, Sadaki Inokuchi, Shigeaki Inoue · 发表于：Journal of Intensive Care · 年份：2016 · DOI：10.1186/s40560-015-0124-1 · 被引用次数：35 · 研究领域：Immune cells in cancer、Sepsis Diagnosis and Treatment、Immune Response and Inflammation

BACKGROUND: Macrophages can differentiate into pro-inflammatory (M1) or anti-inflammatory (M2) phenotypes upon exposure to a pathogen or a cytokine microenvironment. However, M1/M2 macrophage polarization in polymicrobial sepsis has not been fully characterized. METHODS: The polarity of peritoneal exudate (PE) cells from mice that had undergone cecal ligation and puncture (CLP) and the response of those cells to lipopolysaccharide (LPS) in terms of cytokine and chemokine expression were examined. RESULTS: PE cells from CLP mice demonstrated a shift toward the M2 phenotype in terms of marker enzyme expression. In addition, the CLP-derived PE cells showed apparent unresponsiveness to LPS stimulation with regard to expression of pro-inflammatory cytokines such as TNF-α, while the expression of anti-inflammatory cytokines such as IL-10 was induced. Nevertheless, the CLP-PE cells failed to express M2 chemokines including chemokine (C-C motif) ligand 17 (CCL17), CCL22, and CCL24, all of which are important for T cell recruitment. CONCLUSIONS: The results suggested that a shift of naïve monocytes/macrophages to the M2 phenotype, along with the lack of M2 chemokine expression in septic monocytes/macrophages, might be responsible for immunosuppression after sepsis.