Virus-Induced Cellular Senescence Causes Pulmonary Sequelae Post-Influenza Infection.

Area of Science:

• Pulmonary Medicine
• Virology
• Cellular Biology

Background:

• Influenza A virus (IAV) infection can lead to acute and chronic lung damage.
• Cellular senescence, a state of irreversible cell cycle arrest, has been implicated in various aging-related diseases.

Purpose of the Study:

• To investigate whether IAV-induced cellular senescence contributes to prolonged lung alterations.
• To explore the therapeutic potential of targeting senescent cells in influenza-induced lung injury.

Main Methods:

• Mice were infected with H1N1p2009 IAV and analyzed for markers of cellular senescence (p16, p21, β-galactosidase, gamma-H2A.X).
• Genetic depletion of senescent cells (p16-ATTAC mice treated with AP20187) and pharmacological treatment with a senolytic drug (ABT-263) were employed.
• Lung tissue remodeling, epithelial integrity, emphysema, and fibrosis were assessed at various time points post-infection.

Main Results:

• IAV infection induced cellular senescence in the bronchial epithelium and lung parenchyma, persisting long after viral clearance.
• Persistent senescent cells were associated with airway epithelial abrasion, lung remodeling, emphysema, and fibrosis.
• Depletion of senescent cells or treatment with a senolytic drug accelerated airway epithelial repair and improved lung structure, independent of viral clearance.

Conclusions:

• Virus-induced senescent cells play a critical role in the long-term pulmonary sequelae of influenza.
• Targeting senescent cells represents a promising therapeutic strategy for mitigating influenza-related lung damage and promoting repair.