RESUMO
Iron metabolism plays an important role in the pathogenesis of lung cancer. This study aimed to investigate the effect of gene silencing of iron regulatory protein-2 (IRP2) on mRNA and protein expression of transferrin (Tf), transferrin receptor (TfR), and ferritin (Fn) in A549 lung cancer cells. A549 cells were cultured and divided into a liposome control group, a liposome + oligonucleotide (SCODN) control group, and a Lipofectamine + antisense oligonucleotide (ASODN) group. RT-PCR and Western blotting were used to detect mRNA and protein expression of Tf, TfR, and Fn. We found no significant change in Tf mRNA expression among the 3 groups (P = 0.078). TfR and Fn mRNA expressions in the ASODN group notably decreased compared to the liposome and SCODN groups (P < 0.01). IRP2 and TfR protein expressions in the ASODN group were significantly lower than in the liposome or SCODN groups (P < 0.05), whereas no significant change in Tf protein expression was observed between the 3 groups (P = 0.088). Fn protein expression in the ASODN group was significantly higher than in the liposome or SCODN group (P < 0.05). IRP2 can regulate the expression of TfR and Fn by changing its own protein expression and thereby regulate iron metabolism.