Abstract:
:The abnormal PI3K/AKT/mTOR pathway is one of the most common genomic abnormalities in breast cancers including triple-negative breast cancer (TNBC), and pharmacologic inhibition of these aberrations has shown activity in TNBC patients. Here, we designed and identified a small-molecule Comp34 that suppresses both AKT and mTOR protein expression and exhibits robust cytotoxicity towards TNBC cells but not nontumorigenic normal breast epithelial cells. Mechanically, long noncoding RNA (lncRNA) AL354740.1-204 (also named as NUDT3-AS4) acts as a microRNA sponge to compete with AKT1/mTOR mRNAs for binding to miR-99s, leading to decrease in degradation of AKT1/mTOR mRNAs and subsequent increase in AKT1/mTOR protein expression. Inhibition of lncRNA-NUDT3-AS4 and suppression of the NUDT3-AS4/miR-99s association contribute to Comp34-affected biologic pathways. In addition, Comp34 alone is effective in cells with secondary resistance to rapamycin, the best-known inhibitor of mTOR, and displays a greater in vivo antitumor efficacy and lower toxicity than rapamycin in TNBC xenografted models. In conclusion, NUDT3-AS4 may play a proproliferative role in TNBC and be considered a relevant therapeutic target, and Comp34 presents promising activity as a single agent to inhibit TNBC through regulation of NUDT3-AS4 and miR-99s.
journal_name
Cell Death Disjournal_title
Cell death & diseaseauthors
Hao Q,Wang P,Dutta P,Chung S,Li Q,Wang K,Li J,Cao W,Deng W,Geng Q,Schrode K,Shaheen M,Wu K,Zhu D,Chen QH,Chen G,Elshimali Y,Vadgama J,Wu Ydoi
10.1038/s41419-020-03235-wsubject
Has Abstractpub_date
2020-12-11 00:00:00pages
1052issue
12issn
2041-4889pii
10.1038/s41419-020-03235-wjournal_volume
11pub_type
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