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Wang J, Gan L, Li F, Li Q, Wu T, Wu Z, Chen P, Scicluna BP, Feng X, Gu J, Han W, Li N, Lei L. Tracheal epithelial cell-exosome-derived MiR-21-5p inhibits alveolar macrophage pyroptosis to resist pulmonary bacterial infection through PIK3CD-autophagy pathway. Life Sci 2024; 336:122340. [PMID: 38092143 DOI: 10.1016/j.lfs.2023.122340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 06/06/2023] [Accepted: 12/06/2023] [Indexed: 12/24/2023]
Abstract
AIMS Structural cells play an important role in regulating immune cells during infection. Our aim was to determine whether structural porcine tracheal epithelial cells (PTECs) can regulate alveolar macrophages (AMs) to prevent bacterial pneumonia, explore the underlying mechanism(s) and therapeutic target. MATERIALS AND METHODS Actinobacillus pleuropneumoniae (APP) was used as the model strain for infection studies. Small RNA sequencing was used to identify differentially abundant exosome-derived miRNAs. The role of PTECs exosome-derived miR-21-5p in regulating AMs autophagy, pyroptosis, reactive oxygen species (ROS) was determined using RT-qPCR, western-blotting, flow cytometry, immunohistochemistry. Luciferase reporter assays were conducted to identify potential binding targets of miR-21-5p. The universality of miR-21-5p action on resistance to bacterial pulmonary infection was demonstrated using Klebsiella pneumoniae or Staphylococcus aureus in vitro and in vivo infection models. KEY FINDINGS MiR-21-5p was enriched in PETCs-derived exosomes, which protected AMs against pulmonary bacterial infection. Mechanistically, miR-21-5p targeted PIK3CD, to promote autophagy of AMs, which reduced the pyroptosis induced by APP infection via inhibiting the over-production of ROS, which in turn suppressed the over-expression of pro-inflammatory cytokines, and increased bacterial clearance. Importantly, the protective effect and mechanism of miR-21-5p were universal as they also occurred upon challenge with Klebsiella pneumoniae and Staphylococcus aureus. SIGNIFICANCE Our data reveals miR-21-5p can promote pulmonary resistance to bacterial infection by inhibiting pyroptosis of alveolar macrophages through the PIK3CD-autophagy-ROS pathway, suggesting PIK3CD may be a potential therapeutic target for bacterial pneumonia.
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Affiliation(s)
- Jun Wang
- State Key Laboratory for Zoonotic Diseases, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Lin Gan
- State Key Laboratory for Zoonotic Diseases, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Fengyang Li
- State Key Laboratory for Zoonotic Diseases, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Qin Li
- State Key Laboratory for Zoonotic Diseases, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Tong Wu
- State Key Laboratory for Zoonotic Diseases, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Zengshuai Wu
- State Key Laboratory for Zoonotic Diseases, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Peiru Chen
- State Key Laboratory for Zoonotic Diseases, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Brendon P Scicluna
- Department of Applied Biomedical Science, Faculty of Health Sciences, Mater Dei Hospital, University of Malta, Msida, Malta; Centre for Molecular Medicine and Biobanking, University of Malta, Msida, Malta
| | - Xin Feng
- State Key Laboratory for Zoonotic Diseases, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Jingmin Gu
- State Key Laboratory for Zoonotic Diseases, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Wenyu Han
- State Key Laboratory for Zoonotic Diseases, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Na Li
- State Key Laboratory for Zoonotic Diseases, College of Veterinary Medicine, Jilin University, Changchun, China.
| | - Liancheng Lei
- State Key Laboratory for Zoonotic Diseases, College of Veterinary Medicine, Jilin University, Changchun, China.
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Soto Perezchica MM, Guerrero Barrera AL, Avelar Gonzalez FJ, Quezada Tristan T, Macias Marin O. Actinobacillus pleuropneumoniae, surface proteins and virulence: a review. Front Vet Sci 2023; 10:1276712. [PMID: 38098987 PMCID: PMC10720984 DOI: 10.3389/fvets.2023.1276712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2023] [Accepted: 10/17/2023] [Indexed: 12/17/2023] Open
Abstract
Actinobacillus pleuropneumoniae (App) is a globally distributed Gram-negative bacterium that produces porcine pleuropneumonia. This highly contagious disease produces high morbidity and mortality in the swine industry. However, no effective vaccine exists to prevent it. The infection caused by App provokes characteristic lesions, such as edema, inflammation, hemorrhage, and necrosis, that involve different virulence factors. The colonization and invasion of host surfaces involved structures and proteins such as outer membrane vesicles (OMVs), pili, flagella, adhesins, outer membrane proteins (OMPs), also participates proteases, autotransporters, and lipoproteins. The recent findings on surface structures and proteins described in this review highlight them as potential immunogens for vaccine development.
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Affiliation(s)
- María M. Soto Perezchica
- Laboratorio de Biología Celular y Tisular, Departamento de Morfología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
| | - Alma L. Guerrero Barrera
- Laboratorio de Biología Celular y Tisular, Departamento de Morfología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
| | - Francisco J. Avelar Gonzalez
- Laboratorio de Estudios Ambientales, Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
| | - Teodulo Quezada Tristan
- Departamento de Ciencias Veterinaria, Centro de Ciencias Agropecuarias, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
| | - Osvaldo Macias Marin
- Laboratorio de Biología Celular y Tisular, Departamento de Morfología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
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