Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 1 de 1
Filter
Add more filters











Database
Language
Publication year range
1.
Pharmacol Res ; 163: 105292, 2021 01.
Article in English | MEDLINE | ID: mdl-33171305

ABSTRACT

Resolution failure of exacerbated inflammation triggered by Influenza A virus (IAV) prevents return of pulmonary homeostasis and survival, especially when associated with secondary pneumococcal infection. Therapeutic strategies based on pro-resolving molecules have great potential against acute inflammatory diseases. Angiotensin-(1-7) [Ang-(1-7)] is a pro-resolving mediator that acts on its Mas receptor (MasR) to promote resolution of inflammation. We investigated the effects of Ang-(1-7) and the role of MasR in the context of primary IAV infection and secondary pneumococcal infection and evaluated pulmonary inflammation, virus titers and bacteria counts, and pulmonary damage. Therapeutic treatment with Ang-(1-7) decreased neutrophil recruitment, lung injury, viral load and morbidity after a primary IAV infection. Ang-(1-7) induced apoptosis of neutrophils and efferocytosis of these cells by alveolar macrophages, but had no direct effect on IAV replication in vitro. MasR-deficient (MasR-/-) mice were highly susceptible to IAV infection, displaying uncontrolled inflammation, increased viral load and greater lethality rate, as compared to WT animals. Ang-(1-7) was not protective in MasR-/- mice. Interestingly, Ang-(1-7) given during a sublethal dose of IAV infection greatly reduced morbidity associated with a subsequent S. pneumoniae infection, as seen by decrease in the magnitude of neutrophil influx, number of bacteria in the blood leading to a lower lethality. Altogether, these results show that Ang-(1-7) is highly protective against severe primary IAV infection and protects against secondary bacterial infection of the lung. These effects are MasR-dependent. Mediators of resolution of inflammation, such as Ang-(1-7), should be considered for the treatment of pulmonary viral infections.


Subject(s)
Angiotensin I/therapeutic use , Anti-Inflammatory Agents/therapeutic use , Peptide Fragments/therapeutic use , Pneumococcal Infections/drug therapy , Pneumonia, Viral/drug therapy , Proto-Oncogene Proteins/immunology , Receptors, G-Protein-Coupled/immunology , A549 Cells , Angiotensin I/pharmacology , Animals , Anti-Inflammatory Agents/pharmacology , Bronchoalveolar Lavage Fluid/cytology , Bronchoalveolar Lavage Fluid/immunology , Cytokines/immunology , Dogs , Humans , Influenza A virus , Lung/drug effects , Lung/immunology , Lung/pathology , Madin Darby Canine Kidney Cells , Male , Mice, Inbred C57BL , Mice, Knockout , Neutrophils/drug effects , Neutrophils/immunology , Peptide Fragments/pharmacology , Peroxidase/immunology , Phagocytosis/drug effects , Pneumococcal Infections/immunology , Pneumococcal Infections/pathology , Pneumonia, Viral/immunology , Pneumonia, Viral/pathology , Proto-Oncogene Mas , Proto-Oncogene Proteins/genetics , Receptors, G-Protein-Coupled/genetics , Streptococcus pneumoniae
SELECTION OF CITATIONS
SEARCH DETAIL