Long non‑coding RNA ferritin heavy polypeptide 1 pseudogene 3 controls glioma cell proliferation and apoptosis via regulation of the microRNA‑224‑5p/tumor protein D52 axis.

The aim of the present study was to investigate the potential role and regulatory mechanism of long non‑coding RNA ferritin heavy polypeptide 1 pseudogene 3 (FTH1P3) in glioma development. The expression of FTH1P3 in low‑ and high‑grade glioma tissues was investigated using reverse transcription‑quantitative polymerase chain reaction. FTH1P3 expression was overexpressed or suppressed in U251 glioma cells to examine the involvement of FTH1P3 in glioma cell proliferation and apoptosis using MTT assay and flow cytometry respectively. In addition, the regulatory association between FTH1P3, microRNA (miR)‑224‑5p and tumor protein (TP) D52 was investigated to elucidate the potential underlying mechanisms of FTH1P3 in glioma by luciferase reporter assay. The results revealed that FTH1P3 was up‑regulated in glioma tissues, and FTH1P3 expression in high‑grade glioma tissues was significantly higher compared with that in low‑grade glioma tissues. Upregulation of FTH1P3 promoted glioma cell proliferation and inhibited apoptosis. Furthermore, FTH1P3 inhibited miR‑224‑5p expression, which in turn negatively regulated TPD52 expression. Overexpression of miR‑224‑5p significantly inhibited U251 cell proliferation and induced cellular apoptosis; this effect was clearly reversed following co‑transfection of miR‑224‑5p and TPD52. These data revealed that upregulation of FTH1P3 may have promoted glioma cell proliferation and inhibited apoptosis. Thus, the miR‑224‑5p/TPD52 axis may be a downstream mechanism of FTH1P3 in glioma progression. The findings of the present study may provide a theoretical basis for the study of the treatment of glioma in the future.