Background: Considering the poorly understood mechanism of lysine demethylase 1A (KDM1A) in osteosarcoma (OS), we here commence our investigation to fill the blank.

Material and methods:
Methods: Following the transfection as appropriate, 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide (MTT) and flow cytometry assays were used to determine the viability and apoptosis of OS cells MG-63, in which the generation of reactive oxygen species (ROS) and the binding between KDM1A and Bcl-2/ cellular Myc (c-Myc) were separately confirmed via DCF-DA method and chromatin immunoprecipitation-PCR. Reverse-transcription quantitative PCR and western blot were finally introduced to quantify the levels of KDM1A/Bcl-2/c-Myc and endoplasmic reticulum (ER) stress-related factors.

Results: Overexpressed KDM1A enhanced the viability (48 hours) yet repressed the apoptosis and ROS generation, with the downregulation on ER stress-related factors (C/EBP homologous protein [CHOP]; proline-rich extensin-like receptor kinase (PERK) and activating transcription factor 4 [ATF4]) yet the elevation of Bcl-2/c-Myc, while its depletion exerted contrary effects. More importantly, KDM1A could act as the demethylase of Bcl-2/c-Myc, as reflected by the results that the depletion of KDM1A decreased the enrichment of Bcl-2/c-Myc promoter using the antibody against KDM1A yet increased the enrichment by the antibody targeting H3K9me2. Bcl-2/c-Myc silencing, conversely, promoted the ROS generation and apoptosis, elevated the levels of ER stress-related factors and abolished the effects of KDM1A on OS cells.

Conclusion: KDM1A exerts a repressive effect on the apoptosis of OS cells MG-63 by inhibiting the ROS generation and ER stress via demethylation of Bcl-2 and c-Myc.

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