Anti- and pro-tumor functions of autophagy

Area of Science:

• Cellular Biology
• Molecular Biology
• Oncology

Background:

• Autophagy is a fundamental cellular process crucial for stress response in eukaryotes.
• Dysregulation of autophagy is linked to various diseases, including cancer, neurodegeneration, and inflammatory conditions.
• The intricate signaling networks governing autophagy are increasingly recognized for their role in pathological processes.

Purpose of the Study:

• To review the complex and often contradictory role of autophagy in cancer development and progression.
• To elucidate how molecular players, including oncoproteins and tumor suppressors, modulate autophagic activity.
• To explore the therapeutic potential of targeting autophagy for cancer treatment, particularly in enhancing chemotherapy efficacy.

Main Methods:

• Literature review of existing research on autophagy and its involvement in oncogenesis and tumor survival.
• Analysis of signaling pathways and molecular mechanisms by which autophagy is regulated.
• Synthesis of evidence regarding the dual role of autophagy as both an anti-tumor and pro-tumorigenic mechanism.

Main Results:

• Autophagy acts as a double-edged sword in cancer: basal levels inhibit tumor initiation, whereas induced autophagy supports established tumor survival and chemoresistance.
• Oncoproteins like PI3K and Akt suppress autophagy, while tumor suppressors such as beclin 1 and PTEN promote it.
• The tumor suppressor p53 exhibits context-dependent regulation of autophagy, influencing its role in cancer.

Conclusions:

• Autophagy's role in cancer is complex, acting as both a suppressor and promoter of tumor development.
• Targeting autophagy, particularly its pro-tumorigenic functions, presents a promising strategy for overcoming therapeutic resistance and enhancing cancer treatment outcomes.
• Further research into the precise mechanisms of autophagy regulation in different cancer contexts is warranted for effective therapeutic intervention.