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- Title
LPS Response Is Impaired by Urban Fine Particulate Matter.
- Authors
de Souza Xavier Costa, Natália; Ribeiro Júnior, Gabriel; dos Santos Alemany, Adair Aparecida; Belotti, Luciano; Frota Cavalcante, Marcela; Ribeiro, Susan; Matera Veras, Mariana; Kallás, Esper Georges; Saldiva, Paulo Hilário Nascimento; Dolhnikoff, Marisa; Ferraz da Silva, Luiz Fernando
- Abstract
Fine particulate matter (PM2.5) is a complex mixture of components with diverse chemical and physical characteristics associated with increased respiratory and cardiovascular diseases mortality. Our study aimed to investigate the effects of exposure to concentrated PM2.5 on LPS-induced lung injury onset. BALB/c male mice were exposed to either filtered air or ambient fine PM2.5 in an ambient particle concentrator for 5 weeks. Then, an acute lung injury was induced with nebulized LPS. The animals were euthanized 24 h after the nebulization to either LPS or saline. Inflammatory cells and cytokines (IL-1β, IL-4, IL-5, IL-6, IL-10, IL-17, TNF) were assessed in the blood, bronchoalveolar lavage fluid (BALF), and lung tissue. In addition, lung morphology was assessed by stereological methods. Our results showed that the PM+LPS group showed histological evidence of injury, leukocytosis with increased neutrophils and macrophages, and a mixed inflammatory response profile, with increased KC, IL-6, IL-1β, IL-4, and IL-17. Our analysis shows that there is an interaction between the LPS nebulization and PM2.5 exposure, differently modulating the inflammatory response, with a distinct response pattern as compared to LPS or PM2.5 exposure alone. Further studies are required to explain the mechanism of immune modulation caused by PM2.5 exposure.
- Subjects
PARTICULATE matter; IMMUNOREGULATION; CARDIOVASCULAR disease related mortality; LUNGS; LUNG injuries; INTERLEUKIN-17
- Publication
International Journal of Molecular Sciences, 2022, Vol 23, Issue 7, p3913
- ISSN
1661-6596
- Publication type
Article
- DOI
10.3390/ijms23073913