[CAS NO. 1144068-46-1]  WYE-125132 (WYE-132)

WYE-125132 potently and ATP-competitively inhibits recombinant mTOR kinase with IC50 of 0.19 nM and also shows the high selectivity over various PI3Ks and a panel of 230 protein kinases. In vitro, WYE-125132 exhibits a significant anti-proliferative activity against a panel of tumor cell lines with IC50 ranging from 2 nM (LNCap) to 380 nM (HTC116). Besides, WYE-125132 also causes cell cycle progression, induction of apoptosis, and inhibition of protein synthesis and cell size. WYE-125132 results in a significant reduction in the synthesis of pre-tRNA by 72%, 80%, and 53% in actively proliferating cells of MG63, MDA361, and HEK293, respectively by inhibiting mTORC1. Moreover, WYE-125132 is also found to induce the dephosphorylation of Maf1 (negative regulator of Pol III transcription) and its accumulation in the nucleus.