Knockdown of galectin-1 facilitated cisplatin sensitivity by inhibiting autophagy in neuroblastoma cells.

Neuroblastoma (NB) is a type of solid extracranial tumor that usually occurs in babies and children. Chemotherapy is a common method for NB treatment, however, the drug resistance exerts during the chemotherapy of NB. Galectin-1 is a member of galectin family and plays a potent role in the development of chemotherapy and radiotherapy resistance. However, the effect of galectin-1 on cisplatin resistance in NB remains unknown. The present study aimed to investigate the role of galectin-1 in cisplatin resisitance and the potential mechanism. Human neuroblastoma SH-SY5Y and SK-N-SH cells were treated with cisplatin and/or galectin-1/siRNA targeting galectin-1 (si-Gal-1). The cell viability was measured by MTT assay. The IC50 values for cisplatin of neuroblastoma cells were calculated. The expression levels of autophagy markers including microtubule-associated protein light chain 3 (LC3B), Beclin-1, and p62 were detected by western blot. We found that cisplatin inhibited cell viability of SH-SY5Y and SK-N-SH in a dose-dependent manner. Cisplatin induced the ratio of LC3B-II/LC3B-I and Beclin-1 expression, and inhibited the p62 expression. Knockdown of galectin-1 decreased the IC50 for cisplatin of SH-SY5Y and SK-N-SH cells and inhibited cisplatin-induced autophagy. Moreover, inhibition of autophagy suppressed galectin-1-induced increase in IC50 for cisplatin. In conclusion, galectin-1 knockdown enhanced cisplatin sensitivity of neuroblastoma cells by inhibiting autophagy. The findings might provid a novel therapeutic target to overcome cisplatin resistance in chemotherapy of NB.