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BACKGROUND The aim of this study was to evaluate the effects of 3-tetrazolyl methyl-3-hydroxy-oxindole hybrid (THOH) on cell proliferation, apoptosis, and the cell cycle in human lung cancer cell lines SK-LU-1, A549, and A-427, and the normal lung fibroblast cell line, MRC-5, in vitro. MATERIAL AND METHODS Human lung adenocarcinoma cells SK-LU-1, A549, and A-427, and the normal lung fibroblast cells, MRC-5 were cultured and treated with increasing concentrations of 10 mM of a stock solution of THOH in dimethyl sulfoxide (DMSO). An MTT cell proliferation assay was used. Cell apoptosis and the cell cycle were studied using fluorescence-activated cell sorting (FACs) with fluorescein isothiocyanate (FITC), Annexin-V, propidium iodide (PI), and nuclear staining with 4',6-diamidino-2-phenylindole (DAPI). DNA damage was measured using the comet (single-cell gel electrophoresis) assay. Cell migration was evaluated using a wound healing assay, and Western blotting was used to measure protein expression levels. RESULTS Treatment of SK-LU-1 cells with THOH inhibited cell migration. Treatment of lung cancer cells, SK-LU-1, A549, and A-427, with THOH inhibited cell proliferation, with the most marked inhibition found in the SK-LU-1 lung cancer cells (IC50, 12 µM). Treatment of lung cancer cells, SK-LU-1, A549, and A-427, with THOH increased cell apoptosis, resulted in G2/M cell cycle arrest, and inhibited both the platelet-derived growth factor D (PDGF-D) and MEK/ERK signaling pathways. CONCLUSIONS Treatment of adenocarcinoma cells, SK-LU-1, A549, and A-427, with THOH inhibited cell proliferation, apoptosis, and resulted in G2/M cell cycle arrest by targeting PDGF-D and the MEK/ERK signaling pathway.

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Effects of 3-Tetrazolyl Methyl-3-Hydroxy-Oxindole Hybrid (THOH) on Cell Proliferation, Apoptosis, and G2/M Cell Cycle Arrest Occurs by Targeting Platelet-Derived Growth Factor D (PDGF-D) and the MEK/ERK Signaling Pathway in Human Lung Cell Lines SK-LU-1, A549, and A-427