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Tumor suppressor p53 is a master regulator of apoptosis and plays key roles in cell cycle checkpoints. p53 responds to metabolic changes and alters metabolism through several mechanisms in cancer. Lactate dehydrogenase A ( LDHA ), a key enzyme in glycolysis, is highly expressed in a variety of tumors and catalyzes pyruvate to lactate. In the present study, we first analyzed the association and clinical significance of p53 and  LDHA  in breast cancer expressing wild‐type p53 (wt‐p53) and found that  LDHA mRNA  levels are negatively correlated with wt‐p53 but not with mutation p53  mRNA  levels, and low p53 and high  LDHA  expression are significantly associated with poor overall survival rates. Furthermore, p53 negatively regulates  LDHA  expression by directly binding its promoter region. Moreover, a series of  LDHA  gain‐of‐function and rescore experiments were carried out in breast cancer  MCF 7 cells expressing endogenous wt‐p53, showing that ectopic expression of p53 decreases aerobic glycolysis, cell proliferation, migration, invasion and tumor formation of breast cancer cells and that restoration of the expression of  LDHA  in p53‐overexpressing cells could abolish the suppressive effect of p53 on aerobic glycolysis and other malignant phenotypes. In conclusion, our findings showed that repression of  LDHA  induced by wt‐p53 blocks tumor growth and invasion through downregulation of aerobic glycolysis in breast cancer, providing new insights into the mechanism by which p53 contributes to the development and progression of breast cancer.

p53/Lactate dehydrogenase A axis negatively regulates aerobic glycolysis and tumor progression in breast cancer expressing wild‐type p53