The Role of Atg5 Gene in Tumorigenesis Under Autophagy Deficiency Conditions

This study investigates the role of the Atg5 gene in tumorigenesis under conditions of autophagy deficiency. Using mouse embryonic fibroblast (MEF) cells, researchers found that knockout of autophagy-related genes, including Atg5, decreased cell proliferation and motility, highlighting the importance of autophagy in cellular functions. In autophagy-deficient Atg7^-/- MEF cells, overexpression of Atg5 increased cell proliferation, colony formation, and migration, suggesting a pro-tumor role. However, restoring autophagy by overexpressing Atg7 shifted Atg5's role to anti-tumor. In a xenograft mouse model, Atg5-overexpressed Atg7^-/- MEF cells induced temporary tumor formation but did not sustain growth. Biomechanical analysis revealed changes in Wnt5a, p-JNK, and β-catenin expression. Overall, Atg5 acts as a tumor suppressor under normal conditions but promotes tumorigenesis when autophagy is deficient.