The present study is to investigate the effect and mechanism of action of
interleukin (IL)-17A and its receptor IL-17RA on
non-small cell lung cancer (NSCLC). A total of 139 NSCLC patients were included in the study. NSCLC tissues and
tumor-adjacent tissues were collected from the patients. Human NSCLC cell lines H157, H1975, and A549 were used for in vitro studies. MTT assay was performed to determine cell proliferation. Wound healing assay was used to determine cell motility. Transwell assay was carried out to detect migration and invasion. Quantitative real-time polymerase chain reaction was conducted to measure
mRNA expression, while Western blotting was used for determine
protein expression. Immunohistochemistry was employed to evaluate IL-17RA expression in 139 primary human NSCLC tissues. Levels of IL-17RA in NSCLC tissues were higher than
tumor-adjacent normal tissues, and associated with clinical outcomes. Kaplan-Meier survival analysis indicated that NSCLC patients with positive IL-17RA expression had a poor survival. In addition, IL-17A/IL-17RA affected NSCLC cell migration and invasion in vitro. Treatment with IL-17A/IL-17RA increased the expression of MMP-2 and MMP-9 in NSCLC cells. Furthermore, phosphorylation of p38 was enhanced in IL-17RA-overexpressing NSCLC cells.
P38 MAPK-specific inhibitor
SB203580 suppressed the migration and invasion of NSCLC cells. MMP-2 and MMP-9 were downstream effectors of IL-17RA and p38 signaling pathways. The present study demonstrates that
P38 MAPK activity is crucial for IL-17A/IL-17RA to promote NSCLC
metastasis. In addition, IL-17A/IL-17RA signaling may be a novel and promising
cancer therapeutic target for the treatment of NSCLC.