Abstract:
:The signal transducer and activator of transcription 3 (STAT3) is constitutively activated in cancer cells. Therefore, blocking the aberrant activity of STAT3 in tumor cells is a validated therapeutic strategy. To discover novel inhibitors of STAT3 activity, we screened against microbial natural products using a dual-luciferase assay. Using the microbial metabolome library, we identified cosmomycin C (CosC), which was isolated from the mycelium extract of Streptomyces sp. KCTC19769, as a STAT3 pathway inhibitor. CosC inhibited STAT3 (Tyr705) phosphorylation and subsequent nuclear translocation in MDA-MB-468 breast cancer cells. CosC-mediated inhibition of STAT3 signaling pathway was confirmed by suppressed expression of STAT3 downstream target proteins including cyclin D1, Bcl-xL, survivin, Mcl-1, and VEGF in CosC-treated MDA-MB-468 cells. Flow cytometry showed that CosC caused accumulation in the G(0)-G(1) phase of the cell cycle and induced apoptosis via PARP cleavage and caspase-3 activation. Based on these findings, CosC may be a potential candidate for modulation of STAT3 pathway.
journal_name
Bioorg Med Chemjournal_title
Bioorganic & medicinal chemistryauthors
Kim J,Lee YJ,Shin DS,Jeon SH,Son KH,Han DC,Jung SN,Oh TK,Kwon BMdoi
10.1016/j.bmc.2011.10.025subject
Has Abstractpub_date
2011-12-15 00:00:00pages
7582-9issue
24eissn
0968-0896issn
1464-3391pii
S0968-0896(11)00833-9journal_volume
19pub_type
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