A macrophage subpopulation recruited by CC chemokine ligand-2 clears apoptotic cells in noninfectious lung injury.

Journal Article (Journal Article)

CC chemokine ligand-2 (CCL2)/monocyte chemoattractant protein (MCP)-1 expression is upregulated during pulmonary inflammation, and the CCL2-CCR2 axis plays a critical role in leukocyte recruitment and promotion of host defense against infection. The role of CCL2 in mediating macrophage subpopulations in the pathobiology of noninfectious lung injury is unknown. The goal of this study was to examine the role of CCL2 in noninfectious acute lung injury. Our results show that lung-specific overexpression of CCL2 protected mice from bleomycin-induced lung injury, characterized by significantly reduced mortality, reduced neutrophil accumulation, and decreased accumulation of the inflammatory mediators IL-6, CXCL2 (macrophage inflammatory protein-2), and CXCL1 (keratinocyte-derived chemokine). There were dramatic increases in the recruitment of myosin heavy chain (MHC) II IA/IE(int)CD11c(int) cells, exudative macrophages, and dendritic cells in Ccl2 transgenic mouse lungs both at baseline and after bleomycin treatment compared with levels in wild-type mice. We further demonstrated that MHCII IA/IE(int)CD11c(int) cells engulfed apoptotic cells during acute lung injury. Our data suggested a previously undiscovered role for MHCII IA/IE(int)CD11c(int) cells in apoptotic cell clearance and inflammation resolution.

Full Text

Duke Authors

Cited Authors

  • Liang, J; Jung, Y; Tighe, RM; Xie, T; Liu, N; Leonard, M; Gunn, MD; Jiang, D; Noble, PW

Published Date

  • May 1, 2012

Published In

Volume / Issue

  • 302 / 9

Start / End Page

  • L933 - L940

PubMed ID

  • 22287613

Pubmed Central ID

  • PMC3362164

Electronic International Standard Serial Number (EISSN)

  • 1522-1504

Digital Object Identifier (DOI)

  • 10.1152/ajplung.00256.2011


  • eng

Conference Location

  • United States