Roles of Interferon Regulatory Factor 1 in Tumor Progression and Regression: Two Sides of a Coin

Area of Science:

• Oncology
• Immunology
• Molecular Biology

Background:

• Interferon regulatory factor 1 (IRF1) is a transcription factor primarily known for its role in interferon (IFN) signaling.
• Initially implicated in inflammatory processes, IRF1's function in carcinogenesis is increasingly recognized.
• IRF1 influences key antitumor mechanisms, including apoptosis, cell cycle arrest, and immune microenvironment modulation.

Purpose of the Study:

• To review the dual roles of IRF1 in cancer, encompassing both tumor-suppressive and tumor-promoting functions.
• To explore the molecular mechanisms underlying IRF1 regulation in various cancer types.
• To highlight IRF1's potential as a therapeutic target and its association with treatment response.

Main Methods:

• Literature review of studies investigating IRF1 in cancer.
• Analysis of genetic, epigenetic, transcriptional, post-transcriptional, and post-translational regulation of IRF1.
• Examination of IRF1's impact on tumor growth, immune evasion (e.g., PD-L1 regulation), and response to therapies.

Main Results:

• IRF1 exhibits context-dependent functions, promoting tumor suppression through mechanisms like apoptosis induction and angiogenesis inhibition.
• Conversely, IRF1 can promote tumor growth, notably by regulating the immune checkpoint ligand PD-L1.
• Multiple regulatory mechanisms of IRF1 exist in cancer, though their precise impact on tumor progression requires further elucidation.

Conclusions:

• IRF1 plays a complex and often opposing role in cancer development and progression.
• Its regulation of critical pathways, including immune evasion, makes it a significant factor in tumor biology.
• Further research into IRF1's multifaceted functions and regulatory networks is crucial for developing novel cancer therapies.