Carcinoembryonic Antigen Expression and Resistance to Radiation and 5-Fluorouracil-Induced Apoptosis and Autophagy

Understanding the mechanism of tumor resistance is critical for cancer therapy. In this study, we investigated the
effect of carcinoembryonic antigen (CEA) overexpression on UV-and 5-fluorouracil (5-FU)-induced apoptosis
and autophagy in colorectal cancer cells. We used histone deacetylase (HDAC) inhibitor, NaB and DNA
demethylating agent, 5-azacytidine (5-AZA) to induce CEA expression in HT29/219 and SW742 colorectal
cancer cell lines. MTT assay was used to measure IC50 value of the cells exposed to graded concentrations of 5- FU with either 0.1 mM NaB or 1 µM 5-AZA for 72 h . Using CHO- and SW742-CEA transfectants, we also
investigated the effect of CEA expression on UV- and 5-FU-induced apoptosis and autophagy. Treatment of
HT29/219 cell line with NaB and 5-AZA increased CEA expression by 29% and 31%, respectively. Compared
with control cells, the IC50 value for 5-FU of NaB and 5-AZA-treated cells increased by 40% and 57%, respectively. Treatment of SW742 cells with NaB or 5-AZA increased neither CEA expression nor the IC50 value for 5-FU. In comparison to parental cells, CEA expression also significantly protected transfected cells
against UV-induced apoptosis. Decreased proportions of autophagy and apoptosis were also observed in 5-FU
treated SW742- and CHO-CEA transfectants. We conclude that CEA expression can effectively protect
colorectal cancer cells against radiation and drug-induced apoptosis and autophagy.