Nuclear Pirin promotes HCC by acting as a key inflammation-facilitating factor

Area of Science:

• Hepatocellular Carcinoma Research
• Inflammation and Oxidative Stress Biology

Background:

• Chronic inflammation and reactive oxygen species are key drivers of hepatocellular carcinoma (HCC) progression.
• The role of oxidative stress sensor proteins in HCC pathogenesis requires further elucidation.

Purpose of the Study:

• Investigate the function of Pirin (PIR) protein as a mediator of inflammation in HCC.
• Determine the redox-dependent mechanisms regulating PIR's activity and its impact on HCC.

Main Methods:

• Utilized RNA interference, genetic knockout, and pharmaceutical inhibition in HCC cell lines and mouse models.
• Employed transcriptomics, qPCR, western blot, immunofluorescence, and immunohistochemistry to analyze molecular details.

Main Results:

• Identified a novel redox-dependent mechanism for PIR nuclear shuttling, promoting liver inflammation and HCC.
• Discovered a positive feedback loop where nuclear PIR amplifies inflammatory responses via RELA transcription, increasing proinflammatory cytokines.
• Demonstrated that inhibiting PIR's nuclear translocation with antioxidants reduces HCC promotion in vivo.

Conclusions:

• Elucidated a novel redox-dependent mechanism controlling PIR nuclear localization and its role in promoting liver inflammation and HCC.
• Highlighted the critical role of cellular redox status in regulating PIR activity.
• Suggested that targeting the PIR pathway with antioxidants offers a potential therapeutic strategy to mitigate HCC progression.