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Int. J. Mol. Sci. 2017, 18(9), 1940;

Time Course of the Phenotype of Blood and Bone Marrow Monocytes and Macrophages in the Lung after Cigarette Smoke Exposure In Vivo

Laboratório e Histocompatibilidade e Criopreservação, HLA/Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ 20950-000, Brazil
Laboratório de Reparo Tecidual, DHE/IBRAG/Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ 20950-003, Brazil
Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ 20551-030, Brazil
Laboratório de Biologia Redox, ICB/Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil
Nutrition, Métabolismes et Cancer, NUMECAN Unité, Institut national de la santé et de la recherche médicale, INSERM 1241/Institut national de la recherche agronomique, INRA 1341/Université de Rennes 1, 35000 Rennes, France
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Received: 25 July 2017 / Revised: 30 August 2017 / Accepted: 4 September 2017 / Published: 9 September 2017
(This article belongs to the Special Issue Macrophages in Inflammation)
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Alveolar macrophages play a central role in the pathogenesis of chronic obstructive pulmonary disease (COPD). Monocytes are recruited from blood during inflammation and then mature into alveolar macrophages. The aim of this study was to investigate the effect of cigarette smoke (CS) at different times in lung macrophages and monocytes from blood and bone marrow in mice. Male mice (C57BL/6, n = 45) were divided into groups: control, CS 5 days, CS 14 days and CS 30 days. Five days’ CS exposure induced a pronounced influx of neutrophils and macrophages in the lung associated with increased levels of keratinocyte chemoattractant (KC), tumor necrosis factor-α (TNF-α), nitric oxide (NO) and matrix metalloproteinase (MMP)-12. After 14 days of CS exposure, neutrophil recruitment and cytokine production were greatly reduced. Moreover, chronic CS exposure led to increased recruitment of macrophages (with high expression of CD206), transforming growth factor-β (TGF-β) production as well as no detection of TNF-α, interleukin (IL)-6 and KC. CS can also change the monocyte phenotype in the blood and bone marrow, with an increase in Ly6Clow cells. These results show for the first time that CS can change not only macrophage polarization but also monocyte. These results suggest that continued recruitment of Ly6Clow monocytes may help the distinct renewing macrophage M2 population required for COPD progression. View Full-Text
Keywords: COPD; macrophages; cigarette smoke; monocytes COPD; macrophages; cigarette smoke; monocytes

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Oliveira da Silva, C.; Monte-Alto-Costa, A.; Renovato-Martins, M.; Viana Nascimento, F.J.; dos Santos Valença, S.; Lagente, V.; Pôrto, L.C.; Victoni, T. Time Course of the Phenotype of Blood and Bone Marrow Monocytes and Macrophages in the Lung after Cigarette Smoke Exposure In Vivo. Int. J. Mol. Sci. 2017, 18, 1940.

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