Background/Aim: One of the major problems in breast cancer treatment is pharmacoresistance. Therefore, exploration of treatment alternatives is of clinical relevance. The present work focused on tumor cell-inhibiting effects of a combination of tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) and all trans retinoic acid (ATRA) in breast cancer cells. Materials and Methods: Breast cancer cell lines (BT-20, BT-474, MDA-MB-231, MDA-MB-436, MDA-MB-453, MCF-7, SKBR3, T47D, ZR-75-1) and the mammary epithelial cell line MCF-10A were treated with TRAIL and ATRA alone and in combination. Cell viability was assessed via 3-(4,5)-dimethylthiahiazo(-z-yl)-3,5-di-phenytetrazoliumromide (MTT) assay, the potential of cell colony formation via clonogenic assay, cell death induction via cell-cycle analysis by fluorescence-activated cell sorting (FACS), terminal deoxynucleotidyltransferase-mediated UTP nick end labeling (TUNEL) assay and Cell death detection ELISAPLUS, expression of apoptosis and TRAIL pathway proteins via western blot and cell surface expression of TRAIL receptor 1 (DR4) via FACS analysis. Results: TRAIL and ATRA evoked synergistic inhibition of breast cancer cell viability based on cytostatic and cytotoxic mechanisms. This correlated with augmented fragmentation of nuclear DNA, up-regulation of TRAIL receptor, down-regulation of cyclin D1 and enhancement of caspase activity. MCF-10A cells were merely slightly susceptible to TRAIL and ATRA. Conclusion: The cytostatic and cytotoxic effects of the combination of TRAIL and ATRA are tumor cell-selective.
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