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SC06, a novel small molecule compound, displays preclinical activity against multiple myeloma by disrupting the mTOR signaling pathway #MMPMID26329846
Han K; Xu X; Xu Z; Chen G; Zeng Y; Zhang Z; Cao B; Kong Y; Tang X; Mao X
Sci Rep 2015[]; 5 (ä): ä PMID26329846show ga
The mammalian target of rapamycin (mTOR) is extensively involved in multiple myeloma (MM) pathophysiology. In the present study, we reported a novel small molecule SC06 that induced MM cell apoptosis and delayed MM xenograft growth in vivo. Oral administration of SC06 to mice bearing human MM xenografts resulted in significant inhibition of tumor growth at doses that were well tolerated. Mechanistic studies revealed that SC06 selectively inhibited the mTOR signaling pathway but had no effects on other associated kinases, such as AKT, ERK, p38, c-Src and JNK. Further studies showed that SC06-decreased mTOR activation was associated with the downregulation of Raptor, a key component of the mTORC1 complex. SC06 also suppressed the phosphorylation of 4E-BP1 and P70S6K, two typical substrates in the mTORC1 signaling pathway. Notably, expression of Raptor, phosphorylation of mTOR and phosphorylated 4E-BP1 was also decreased in the tumor tissues from SC06-treated mice, which was consistent with the cellular studies. Therefore, given the potency and low toxicity, SC06 could be developed as a potential anti-MM drug candidate by disrupting the mTOR signaling.