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dc.contributor.authorLan, Lan
dc.contributor.authorAppelman, Carl
dc.contributor.authorSmith, Amber Rae
dc.contributor.authorYu, Jia
dc.contributor.authorLarsen, Sarah
dc.contributor.authorMarquez, Rebecca T.
dc.contributor.authorLiu, Hao
dc.contributor.authorWu, Xiaoqing
dc.contributor.authorGao, Philip
dc.contributor.authorRoy, Anuradha
dc.contributor.authorAnbanandam, Asokan
dc.contributor.authorGowthaman, Ragul
dc.contributor.authorKaranicolas, John
dc.contributor.authorDe Guzman, Roberto N.
dc.contributor.authorRogers, Steven A.
dc.contributor.authorAubé, Jeffrey
dc.contributor.authorJi, Min
dc.contributor.authorCohen, Robert S.
dc.contributor.authorNeufeld, Kristi L.
dc.contributor.authorXu, Liang
dc.identifier.citationLan Lan, Appelman Carl, Smith Amber R., Yu Jia, Larsen Sarah, Marquez Rebecca T., Liu Hao, Wu Xiaoqing, Gao Philip, Roy Anuradha, Anbanandam Asokan, Gowthaman Ragul, Karanicolas John, De Guzman Roberto N., Rogers Steven, Aubé Jeffrey, Ji Min, Cohen Robert S., Neufeld Kristi L., Xu Liang, (2015), Natural product (−)-gossypol inhibits colon cancer cell growth by targeting RNA-binding protein Musashi-1, Molecular Oncology, 9, doi: 10.1016/j.molonc.2015.03.014.en_US
dc.description.abstractMusashi-1 (MSI1) is an RNA-binding protein that acts as a translation activator or repressor of target mRNAs. The best-characterized MSI1 target is Numb mRNA, whose encoded protein negatively regulates Notch signaling. Additional MSI1 targets include the mRNAs for the tumor suppressor protein APC that regulates Wnt signaling and the cyclin-dependent kinase inhibitor P21WAF−1. We hypothesized that increased expression of NUMB, P21 and APC, through inhibition of MSI1 RNA-binding activity might be an effective way to simultaneously downregulate Wnt and Notch signaling, thus blocking the growth of a broad range of cancer cells. We used a fluorescence polarization assay to screen for small molecules that disrupt the binding of MSI1 to its consensus RNA binding site. One of the top hits was (−)-gossypol (Ki = 476 ± 273 nM), a natural product from cottonseed, known to have potent anti-tumor activity and which has recently completed Phase IIb clinical trials for prostate cancer. Surface plasmon resonance and nuclear magnetic resonance studies demonstrate a direct interaction of (−)-gossypol with the RNA binding pocket of MSI1. We further showed that (−)-gossypol reduces Notch/Wnt signaling in several colon cancer cell lines having high levels of MSI1, with reduced SURVIVIN expression and increased apoptosis/autophagy. Finally, we showed that orally administered (−)-gossypol inhibits colon cancer growth in a mouse xenograft model. Our study identifies (−)-gossypol as a potential small molecule inhibitor of MSI1-RNA interaction, and suggests that inhibition of MSI1's RNA binding activity may be an effective anti-cancer strategy.en_US
dc.publisherWiley Open Accessen_US
dc.rights© 2015. This published version is made available under the CC BY-NC 3.0 license
dc.titleNatural product (L)-gossypol inhibits colon cancer cell growth by targeting RNA-binding protein Musashi-1en_US
kusw.kuauthorXu, Liang
kusw.kudepartmentMolecular Biosciencesen_US
kusw.oaversionScholarly/refereed, publisher versionen_US
kusw.oapolicyThis item meets KU Open Access policy criteria.en_US

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© 2015. This published version is made available under the CC BY-NC 3.0 license
Except where otherwise noted, this item's license is described as: © 2015. This published version is made available under the CC BY-NC 3.0 license