E2F1-induced ferritin heavy chain 1 pseudogene 3 (FTH1P3) accelerates non-small cell lung cancer gefitinib resistance.

Long noncoding RNAs (lncRNAs) have been identified to be critical regulator for various human diseases and emerging evidence illustrate the essential function of lncRNAs in the non-small cell lung cancer (NSCLC). Here, our research team tried to identify the roles of lncRNA ferritin heavy chain 1 pseudogene 3 (FTH1P3) in the NSCLC, as well as its molecular mechanism. LncRNA microarray analysis revealed that ferritin heavy chain 1 pseudogene 3 (FTH1P3) was up-regulated in the gefitinib-resistant cells (PC9/GR). Clinically, lncRNA FTH1P3 high-expression was closely correlated with NSCLC patients' unfavorable prognosis. Gain and loss of functional experiments revealed that FTH1P3 promoted the proliferation and invasion of NSCLC cells in vitro, and FTH1P3 knockdown repressed the tumor growth in vivo. Mechanistically, transcription factor E2F1 accelerated the transcription of FTH1P3. RNA immunoprecipitation and chromatin immunoprecipitation experiments showed that FTH1P3 can recruit lysine-specific demethylase 1 (LSD1) and epigenetically repress the TIMP3, thereby accelerating the tumorigenesis of NSCLC. In summary, these findings suggest that FTH1P3 plays a critical role in the gefitinib resistance and progression of NSCLC, providing a potential novel prognostic marker for NSCLC.

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