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http://dx.doi.org/10.4062/biomolther.2014.107

ATF3 Mediates Anti-Cancer Activity of Trans-10, cis-12-Conjugated Linoleic Acid in Human Colon Cancer Cells  

Kim, Kui-Jin (Department of Nutrition and Food Science, College of Agriculture and Natural Resources, University of Maryland)
Lee, Jihye (Department of Nutrition and Food Science, College of Agriculture and Natural Resources, University of Maryland)
Park, Yeonhwa (Department of Food Science, University of Massachusetts)
Lee, Seong-Ho (Department of Nutrition and Food Science, College of Agriculture and Natural Resources, University of Maryland)
Publication Information
Biomolecules & Therapeutics / v.23, no.2, 2015 , pp. 134-140 More about this Journal
Abstract
Conjugated linoleic acids (CLA) are a family of isomers of linoleic acid. CLA increases growth arrest and apoptosis of human colorectal cancer cells through an isomer-specific manner. ATF3 belongs to the ATF/CREB family of transcription factors and is associated with apoptosis in colorectal cancer. The present study was performed to investigate the molecular mechanism by which t10, c12-CLA stimulates ATF3 expression and apoptosis in human colorectal cancer cells. t10, c12-CLA increased an apoptosis in human colorectal cancer cells in dose dependent manner. t10, c12-CLA induced ATF3 mRNA and luciferase activity of ATF3 promoter in a dose-dependent manner. The responsible region for ATF3 transcriptional activation by t10, c12-CLA is located between -147 and -1850 of ATF3 promoter. mRNA stability of ATF3 was not affected by t10, c12-CLA treatment. t10, c12-CLA increases $GSK3{\beta}$ expression and suppresses IGF-1-stimulated phosphorylation of Akt. The knockdown of ATF3 suppressed expression of $GSK3{\beta}$ and NAG-1 and PARP cleavage. The results suggest that t10, c12-CLA induces apoptosis through ATF3-mediated pathway in human colorectal cancer cells.
Keywords
Conjugated linoleic acid; Activating transcription factor 3; Colon cancer;
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