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Induction of Cyclin D1 Proteasomal Degradation by Branch Extracts from Abeliophyllum distichum Nakai in Human Colorectal Cancer Cells
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  • Journal title : Korean Journal of Plant Resources
  • Volume 28, Issue 6,  2015, pp.682-689
  • Publisher : The Plant Resources Society of Korea
  • DOI : 10.7732/kjpr.2015.28.6.682
 Title & Authors
Induction of Cyclin D1 Proteasomal Degradation by Branch Extracts from Abeliophyllum distichum Nakai in Human Colorectal Cancer Cells
Park, Gwang Hun; Park, Jae Ho; Jeong, Jin Boo;
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Abeliophyllum distichum Nakai (A. distichum) has been reported to exert the inhibitory effect on angiotensin converting enzyme and aldose reductase. Recently, our group found that branch extracts of A. distichum (EAFAD-B) induce apoptosis through ATF3 activation in human colon cancer cells. However, anti-cancer reagents exert their activity through the regulation of various molecular targets. Therefore, the elucidation of potential mechanisms of EAFAD-B for anti-cancer activity may be necessary. To elucidate the potential mechanism of EAFAD-B for anti-cancer activity, we evaluated the regulation of cyclin D1 in human colon cancer cells. EAFAD-B decreased cellular accumulation of cyclin D1 protein. However, cyclin D1 mRNA was not changed by EAFAD-B. Inhibition of proteasomal degradation by MG132 attenuated EAFAD-B-mediated cyclin D1 downregulation and the half-life of cyclin D1 was decreased in the cells treated with EAFAD-B. In addition, EAFAD-B induced cyclin D1 phosphorylation at threonine-286 and the point mutation of threonine-286 to alanine attenuated EAFAD-B-mediated cyclin D1 proteasomal degradation. Inhibitions of both ERK1/2 by PD98059 and NF-κB by a selective inhibitor, BAY 11-7082 suppressed cyclin D1 downregulation by EAFAD-B. From these results, we suggest that EAFAD-B-mediated cyclin D1 downregulation may result from proteasomal degradation through its threonine-286 phosphorylation via ERK1/2-dependent NF-κB activation. The current study provides new mechanistic link between EAFAD-B and anti-cancer activity in human colon cancer cells.
Abeliophyllum distichum Nakai;Cyclin D1;Proteasomal degradation;Cancer prevention;Colon cancer;
 Cited by
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