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Both loss of PSAT1 and elimination of serine through the diet had been required to suppress colorectal disease xenograft growth and enhance the antitumor activity of 5-fluorouracil (5-FU). Restricting endogenous and exogenous serine in vitro augmented 5-FU-induced cell demise, DNA damage, and metabolic perturbations, most likely bookkeeping for the observed antitumor impact. Collectively, our outcomes suggest that both endogenous and exogenous types of serine contribute to colo