The cell cycle regulator 14-3-3σ opposes and reverses cancer metabolic reprogramming

Extensive reprogramming of cellular energy metabolism is a hallmark of cancer. Despite its importance, the molecular mechanism controlling this tumour metabolic shift remains not fully understood. Here we show that 14-3-3 sigma regulates cancer metabolic reprogramming and protects cells from tumorigenic transformation. 14-3-3 sigma opposes tumour-promoting metabolic programmes by enhancing c-Myc poly-ubiquitination and subsequent degradation. 14-3-3 sigma demonstrates the suppressive impact on cancer glycolysis, glutaminolysis, mitochondrial biogenesis and other major metabolic processes of tumours. Importantly, 14-3-3 sigma expression levels predict overall and recurrence-free survival rates, tumour glucose uptake and metabolic gene expression in breast cancer patients. Thus, these results highlight that 14-3-3 sigma is an important regulator of tumour metabolism, and loss of 14-3-3 sigma expression is critical for cancer metabolic reprogramming. We anticipate that pharmacologically elevating the function of 14-3-3 sigma in tumours could be a promising direction for targeted anticancer metabolism therapy development in future.