IL-1β-Mediated Up-Regulation of WT1D via miR-144-3p and Their Synergistic Effect with NF-κB/COX-2/HIF-1α Pathway on Cell Proliferation in LUAD.

BACKGROUND/AIMS: IL-1β is an important mediator of "inflammation-cancer" transformation through IL-1β/NF-κB/COX-2/HIF-1α signaling pathway, whereas certain portion of patients with lung adenocarcinoma (LUAD) still suffer from rapid tumor progression in clinical practice, indicating the occurrence of potential bypass.
METHODS: Real-time polymerase chain reaction was applied to examine the expressions of mir-144-3p, WT1, NF-κB, COX2 and HIF-1α at the mRNA level in 127 LUAD samples and corresponding adjacent tissues. miR-144-3p mimic and antagormiR were used to trigger activation and suppression of miR-144-3p in A549 cells, respectively. MTT assay and Western blotting analysis were carried out to evaluate the cell proliferation. Stable clones with over-expression or knockdown of WT1 were generated with plasmid or shRNA by lentiviral vector technology in H1568 and H1650 NSCLC cell lines, respectively. Dual luciferase reporter assay was performed to validate the effect of miR-144-3p on WT1D. Xenograft model was established for in vivo experiment, and TCGA data were extracted for validation.
RESULTS: miR-144-3p could suppress the WT1D expression at the post-transcriptional level, hence regulating cell proliferation in LUAD. WT1 and COX-2 were independent prognostic factors of LUAD patients. In addition, inhibition of IL-1β/miR-144-3p/WT1D and IL-1β/NF-κB/COX-2/HIF-1α pathways using miR-144-3p mimic and Celecoxib, respectively, displayed synergistic suppressive effect on cell proliferation in LUAD.
CONCLUSION: A de novo IL-1β/miR-144-3p/WT1D axis was involved in proliferative regulation of LUAD. Moreover, simultaneous blockade of both IL-1β/miR-144-3p/WT1D and IL-1β/NF-κB/COX-2/ HIF-1α pathways might have synergistic suppressive effect on cell proliferation in LUAD.