Tumour-associated mutant p53 drives the Warburg effect

Area of Science:

• Oncology
• Molecular Biology
• Cancer Metabolism

Background:

• Tumor cells exhibit altered metabolism, notably the Warburg effect (aerobic glycolysis).
• Mutations in the p53 tumor suppressor gene (mutp53) are common in cancer, often conferring gain-of-function (GOF) oncogenic properties.
• The precise mechanisms underlying mutp53 GOF and its link to cancer metabolism remain incompletely understood.

Purpose of the Study:

• To investigate whether tumor-associated mutant p53 (mutp53) exhibits gain-of-function (GOF) by influencing the Warburg effect.
• To elucidate the molecular mechanisms by which mutp53 may regulate aerobic glycolysis in cancer cells.
• To explore the therapeutic implications of targeting the identified mutp53-driven metabolic pathway.

Main Methods:

• Utilized cultured cells and mutp53 knockin mouse models.
• Investigated the role of RhoA/ROCK signaling pathway and GLUT1 translocation.
• Assessed the impact of inhibiting RhoA/ROCK/GLUT1 signaling on mutp53 GOF.
• Evaluated the effect of glycolysis inhibition on mutp53 GOF in tumorigenesis.

Main Results:

• Demonstrated that tumor-associated mutp53 stimulates the Warburg effect as a novel GOF.
• Showed that mutp53 promotes GLUT1 translocation to the plasma membrane via activated RhoA and ROCK.
• Confirmed that inhibiting RhoA/ROCK/GLUT1 signaling largely abolishes mutp53's ability to stimulate the Warburg effect.
• Found that inhibiting glycolysis significantly compromises mutp53 GOF in promoting tumor development.

Conclusions:

• Identified a new gain-of-function (GOF) for mutant p53 (mutp53) involving the stimulation of the Warburg effect.
• Elucidated a novel mechanism where mutp53 activates the RhoA/ROCK pathway, leading to GLUT1 translocation and enhanced aerobic glycolysis.
• Established that targeting the RhoA/ROCK/GLUT1 pathway and glycolysis is a potential strategy to counteract mutp53-driven tumorigenesis.