β-Defensin-1 Regulates Influenza Virus Infection in Human Bronchial Epithelial Cells through the STAT3 Signaling...

Area of Science:

• Immunology
• Virology
• Molecular Biology

Background:

• Respiratory tract epithelial cells and antimicrobial proteins are key defenses against respiratory pathogens.
• Beta-defensin-1 (DEFB1), an antimicrobial peptide, exhibits antiviral properties.
• Influenza A virus (IAV) infection leads to decreased DEFB1 expression in human bronchial epithelial cells (HBEpCs).

Purpose of the Study:

• To investigate the role of DEFB1 in the host response to IAV infection.
• To explore the mechanisms by which DEFB1 influences IAV replication in HBEpCs.
• To identify potential therapeutic targets for IAV intervention.

Main Methods:

• Overexpression and siRNA silencing of DEFB1 in HBEpCs.
• IAV infection followed by quantification using IAV matrix gene analysis, plaque assays, and confocal microscopy.
• MicroRNA analysis (hsa-miR-186-5p, hsa-miR-340-5p) for DEFB1 regulation.
• Analysis of NF-κB and STAT3 expression via PCR array and Ingenuity Pathway Analysis (IPA).

Main Results:

• Overexpression of DEFB1 significantly reduced IAV replication in HBEpCs.
• DEFB1 expression is modulated by hsa-miR-186-5p and hsa-miR-340-5p, with higher binding efficiency for hsa-miR-186-5p.
• DEFB1 overexpression increased NF-κB expression and modulated STAT3 expression, indicating JAK1/STAT3 pathway involvement.

Conclusions:

• Beta-defensin-1 plays a crucial role in controlling IAV replication in the respiratory tract.
• The antiviral activity of DEFB1 is mediated, in part, through the STAT3 signaling pathway.
• DEFB1 represents a promising therapeutic target for developing novel antiviral strategies against IAV.