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2016 ; 54
(3
): 436-46
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Characterization of Distinct Macrophage Subpopulations during Nitrogen
Mustard-Induced Lung Injury and Fibrosis
#MMPMID26273949
Venosa A
; Malaviya R
; Choi H
; Gow AJ
; Laskin JD
; Laskin DL
Am J Respir Cell Mol Biol
2016[Mar]; 54
(3
): 436-46
PMID26273949
show ga
Nitrogen mustard (NM) is an alkylating agent known to cause extensive pulmonary
injury progressing to fibrosis. This is accompanied by a persistent macrophage
inflammatory response. In these studies, we characterized the phenotype of
macrophages accumulating in the lung over time following NM exposure. Treatment
of rats with NM (0.125 mg/kg, intratracheally) resulted in an increase in
CD11b(+) macrophages in histologic sections. These cells consisted of inducible
nitric oxide synthase(+) (iNOS) proinflammatory M1 macrophages, and CD68(+),
CD163(+), CD206(+), YM-1(+), and arginase-II(+)antiinflammatory M2 macrophages.
Although M1 macrophages were prominent 1-3 days after NM, M2 macrophages were
most notable at 28 days. At this time, they were enlarged and vacuolated,
consistent with a profibrotic phenotype. Flow cytometric analysis of isolated
lung macrophages identified three phenotypically distinct subpopulations: mature
CD11b(-), CD43(-), and CD68(+) resident macrophages, which decreased in numbers
after NM; and two infiltrating (CD11b(+)) macrophage subsets: immature CD43(+) M1
macrophages and mature CD43(-) M2 macrophages, which increased sequentially.
Time-related increases in M1 (iNOS, IL-12?, COX-2, TNF-?, matrix
metalloproteinase-9, matrix metalloproteinase-10) and M2 (IL-10, pentraxin-2,
connective tissue growth factor, ApoE) genes, as well as chemokines/chemokine
receptors associated with trafficking of M1 (CCR2, CCR5, CCL2, CCL5) and M2
(CX3CR1, fractalkine) macrophages to sites of injury, were also noted in
macrophages isolated from the lung after NM. The appearance of M1 and M2
macrophages in the lung correlated with NM-induced acute injury and the
development of fibrosis, suggesting a potential role of these macrophage
subpopulations in the pathogenic response to NM.