Carambolaside W Inhibited H1N1 Influenza Virus-Induced Oxidative Stress through STAT-3/BCL-XL Signaling Pathway

Area of Science:

• Virology
• Natural Product Chemistry
• Pharmacology

Background:

• H1N1 influenza virus causes seasonal outbreaks with severe respiratory symptoms and potential complications like pneumonia.
• Developing effective antiviral agents against H1N1 is crucial for public health.
• Oxidative stress and apoptosis are implicated in H1N1 pathogenesis.

Purpose of the Study:

• To isolate and characterize a novel compound from carambola with potential anti-H1N1 activity.
• To evaluate the efficacy and safety of the isolated compound against H1N1 influenza virus in vitro.
• To investigate the underlying mechanisms of action, including effects on oxidative stress and apoptosis.

Main Methods:

• Extraction and HR-ESI-MS characterization of a flavonoid glycoside from carambola, named carambolaside W.
• In vitro assessment of carambolaside W's antiviral activity against H1N1 influenza virus replication.
• Evaluation of carambolaside W's effects on H1N1-induced oxidative stress and apoptosis-related protein expression via Western blot assays.

Main Results:

• Carambolaside W was identified as a flavonoid glycoside (C47H58O2) with significant anti-H1N1 influenza virus effects.
• The compound demonstrated low toxicity and effectively inhibited H1N1 replication in vitro.
• Carambolaside W mitigated H1N1-induced oxidative stress and modulated apoptosis-related protein expression.

Conclusions:

• Carambolaside W is a promising low-toxicity natural flavonoid with potent in vitro activity against the H1N1 influenza virus.
• It acts by inhibiting viral replication, reducing oxidative stress, and altering apoptosis pathways.
• Carambolaside W represents a potential therapeutic candidate for treating H1N1 influenza infections.