國家衛生研究院 NHRI:Item 3990099045/8543

NHRI > Institute of Biotechnology and Pharmaceutical Research > Shiow-Ju Lee > Periodical Articles > Item 3990099045/8543

Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/8543

Title:	Targeting a ribonucleoprotein complex containing the caprin-1 protein and the c-Myc mRNA suppresses tumor growth in mice: An identification of a novel oncotarget
Authors:	Qiu, YQ;Yang, CW;Lee, YZ;Yang, RB;Lee, CH;Hsu, HY;Chang, CC;Lee, SJ
Contributors:	Institute of Biotechnology and Pharmaceutical Research
Abstract:	Tylophorine compounds have been the focus of drug development for decades. Tylophorine derivatives exhibit anti-cancer activities but their cellular targets remain unknown. We used a biotinylated tylophorine derivative to probe for the interacting cellular target(s) of tylophorine. Tylophorine directly binds to caprin-1 and consequently enhances the recruitment of G3BP1, c-Myc mRNA, and cyclin D2 mRNA to form a ribonucleoprotein complex. Subsequently, this tylophorine targeted ribonucleoprotein complex is sequestered to the polysomal fractions and the protein expressions of the associated mRNA-transcripts are repressed. Caprin-1 depleted carcinoma cells become more resistant to tylophorine, associated with decreased formation of the ribonucleoprotein complex targeted by tylophorine. Consequently, tylophorine downregulates c-Myc and cyclins D1/D2, causing hypophosphorylation of Rb and suppression of both processing-body formation and the Warburg effect. Gene expression profiling and gain-of-c-Myc-function experiments also revealed that the downregulated c-Myc contributes to the anti-oncogenic effects of tylophorine compounds. Furthermore, the potent tylophorine derivative dibenzoquinoline-33b elicited a similar effect, as c-Myc protein levels were also decreased in xenograft tumors treated with dibenzoquinoline-33b. Thus, tylophorine compounds exert anti-cancer activity predominantly by targeting and sequestering the caprin-1 protein and c-Myc mRNA associated ribonucleoprotein complex.
Date:	2015-02
Relation:	Oncotarget. 2015 Feb;6(4):2148-2163.
Link to:	http://dx.doi.org/10.18632/oncotarget.3236
Cited Times(WOS):	https://www.webofscience.com/wos/woscc/full-record/WOS:000352691800019
Cited Times(Scopus):	http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84922998508
Appears in Collections:	[Shiow-Ju Lee] Periodical Articles

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