A novel mechanism for CCR4 in the regulation of macrophage activation in bleomycin-induced pulmonary fibrosis.

The American Journal of Pathology
Glenda TrujilloCory M Hogaboam

Abstract

Macrophage polarization into M1 or M2 phenotypes dictates the nature, duration, and severity of an inflammatory response. The objective of this study was to examine the role of CC chemokine receptor 4 (CCR4) in macrophage polarization during pulmonary oxidative injury in wild-type [WT (CCR4(+/+))] and CCR4-deficient (CCR4(-/-)) mice. Intrapulmonary administration of bleomycin sulfate provoked lethal inflammatory and fibrotic responses in WT (CCR4(+/+)) mice, but such responses were absent in CCR4(-/-) mice. Transcript and protein analyses of alveolar and bone marrow-derived macrophages showed that cells isolated from CCR4(-/-) mice did not exhibit CCL17-dependent M1 activation in response to bleomycin. Instead, CCR4(-/-) macrophages showed an M2 phenotype characterized by significantly elevated expression of arginase 1 and FIZZ1 (found in inflammatory zone 1), particularly during the peak of pulmonary inflammation. Compared with WT (CCR4(+/+)) mice, CCR4(-/-) mice exhibited a significant increase in the expression of the nonsignaling CC chemokine scavenging receptor D6 in whole lung samples and isolated macrophages. Thus, these results demonstrate that CCL17-dependent activation of CCR4 in macrophages plays a central role in fr...Continue Reading

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