Targeting Cancer Translational Plasticity: IRES-Driven Metabolism and Survival Within the Tumor Microenvironment

Area of Science:

• Molecular Biology
• Cancer Research
• Biochemistry

Background:

• Tumor microenvironments impose stress (hypoxia, nutrient depletion), inhibiting cap-dependent translation.
• Cancer cells utilize cap-independent translation via internal ribosome entry sites (IRES) for survival.

Purpose of the Study:

• To elucidate the role of IRES-mediated translation in cancer cell survival and therapy resistance.
• To explore the regulation of IRES activity by IRES trans-acting factors (ITAFs).
• To identify novel therapeutic strategies targeting IRES pathways.

Main Methods:

• Analysis of mRNA translation mechanisms under stress conditions.
• Investigating the function of specific IRES elements and ITAFs (YB-1, PTB, hnRNPA1).
• Review of emerging therapeutic approaches targeting IRES and ITAFs.

Main Results:

• IRES elements enable selective translation of proteins promoting cell survival (anti-apoptotic, metabolic reprogramming, EMT).
• Stress-induced ITAFs enhance IRES activity, supporting tumor progression and therapy resistance.
• IRES-mediated translation is a key adaptive mechanism in cancer.

Conclusions:

• Understanding IRES-mediated translational reprogramming is crucial for overcoming cancer therapy resistance.
• Targeting IRES elements and ITAFs presents a promising therapeutic avenue for eliminating persistent tumor cells.
• Further research into IRES structural diversity and ITAF function is warranted for developing effective interventions.