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The Company of Biologists, Biology Open, 2019

DOI: 10.1242/bio.040808

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Microenvironmental stimuli induce different macrophage polarizations in experimental models of emphysema

This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Data provided by SHERPA/RoMEO

Abstract

Background: Macrophages play a pivotal role in the development of emphysema and depending on the microenvironment stimuli can be polarized into M1- or M2-like macrophage phenotypes. Aim: To compare macrophage polarizations in cigarette smoke (CS)- and porcine pancreatic elastase (PPE)-induced emphysema models. C57BL/6 mice were subdivided into four experimental groups. In the PPE group, animals received an intranasal instillation of PPE (0.677 IU); in the Saline group, animals received an intranasal instillation of Saline (0.9%). Animals from both groups were euthanized on the 28th day. In the CS group, animals were exposed to CS for 30 minutes, twice a day, 5 days per week for 12 weeks. In the Control group, animals received filtered air. Results: We observed an increase in total macrophages for both experimental models. For M1-like macrophage markers, we observed an increase in TNF-α+ and IFN-γ+ cells, Cxcl-9 and Cxcl-10 expressions in PPE and CS groups. Only for CS group, we detected an increased expression of IL-12b. For M2-like macrophages markers, we observed a down regulation for IL-10, IL-4, IL-13, Arg1 and Fizz1 and an increase of TGF-β+ cells for PPE group while for CS group there was an increase in TGF-β+ cells and IL-10 expression. All exposure groups were compared to their respective controls. Conclusions: In summary, we demonstrated that CS- and PPE-induced models resulted in different microenvironmental stimuli. CS exposure induced an environmental stimulus related to M1- and M2-like macrophage phenotypes similar to previous results described in COPD patients, whereas the elastase-induced model provided an environmental stimulus related only to the M1 phenotype.