Pirin Inhibits FAS-Mediated Apoptosis to Support Colorectal Cancer Survival

Area of Science:

• Oncology
• Molecular Biology
• Immunology

Background:

• Colorectal cancer (CRC) resistance to immunotherapy is linked to impaired FAS-dependent apoptosis.
• Pirin (PIR) protein is upregulated in colon cancers and contributes to tumorigenesis.

Purpose of the Study:

• To investigate the role of pirin (PIR) in colorectal cancer (CRC) survival and its impact on FAS-dependent apoptosis.
• To elucidate the molecular mechanisms by which PIR influences the FAS pathway.

Main Methods:

• Utilized knockout and inhibition models of PIR in mice and cell lines.
• Investigated the interaction between PIR, NIK, NFκB2, and FAS using molecular biology techniques.
• Assessed the sensitivity of cancer cells to apoptosis induction via FAS mAb and CD8+ T cells.

Main Results:

• PIR upregulation promotes CRC tumorigenesis by suppressing FAS expression and FAS-dependent apoptosis.
• PIR inhibits NFκB2 activation and its binding to the FAS promoter, and prevents FAS translocation to the cell membrane.
• Knockdown or knockout of PIR significantly sensitizes CRC cells to apoptosis, reducing tumor formation in mice.

Conclusions:

• A novel PIR-NIK-NFκB2-FAS survival pathway is identified in colorectal cancer.
• Targeting PIR represents a potential strategy to overcome immunotherapy resistance and enhance CRC treatment efficacy.