[Chlorpromazine hydrochloride plays a tumor suppressive role in diffuse large B lymphoma by promoting the expression...

Objective: To investigate the effect of chlorpromazine hydrochloride on proliferation, apoptosis and cell cycle arrest of human diffuse large B lymphoma cells and its possible mechanism. Methods: In January 2019, OCI-LY3 and TMD8 cells were treated with different concentrations of chlorpromazine hydrochloride for 72 h, the proliferations were detected by Alamar Blue assay. The apoptosis and cell cycle arrest of OCI-LY3 and TMD8 cells were detected by flow cytometry with FITC annexin V/PI (propidium iodide) double staining and PI, respectively. The mRNA levels of cyclin-dependent kinase inhibitor P21, P27, CyclinD1 and S1PR2 were detected by RTqPCR. The protein levels of P21, P27 and S1PR2 were detected by Western blot. Results: With the increase of chlorpromazine hydrochloride concentration, the proliferation inhibition rates of OCI-LY3 and TMD8 cells increased at 72 hours, apoptosis and G1 cell cycle arrest increased at 24 hours. Compared with the control group, the expression levels of P21, P27 and SIPR2 mRNA in OCI-LY3 and TMD8 cells were increased at 10 μmol/L chlorpromazine after 12 hours treatment (P<0.05) . And there was no significant difference in the expression of CyclinD1 mRNA (P>0.05) . There was a similar increase in protein levels of P21, P27 and SIPR2 in OCI-LY3 and TMD8 cells after 24 hours of treatment (P<0.05) . Conclusion: Chlorpromazine hydrochloride at a specific concentration may inhibit the proliferation of ABC diffuse large B lymphoma cells by promoting the expression of S1PR2, and promote cell apoptosis and G1 phase cell cycle arrest.