[Expression of Notch signal molecules in human lymphoma cells and its significance]

The study was aimed to investigate the expression of Notch signal molecules in human lymphoma cells and its significance. Raji, Maver, Z138 and Jurkat cell lines were used in the study. RT-PCR was used to determine the expression of Notch signaling molecules in these lymphoma cells. Flow cytometry was used to detect the apoptosis and cell-cycle of the lymphoma cells induced by different concentrations of gamma secretase inhibitor DAPT. CCK-8 was used to detect the proliferation of the lymphoma cells treated by DAPT. The results showed that the expression of Notch molecules in the four cell lines was different. Notch1 and Notch2 were found to be expressed in the four lymphoma cell lines, Notch3 predominantly expressed in Jurkat cells, Notch4 only expressed in Raji cells weakly and Hes1 only expressed in Raji and Jurkat cells. Treatment with DAPT could increase the apoptosis ratio of Raji and Jurkat cells. Besides, DAPT could significantly inhibit the proliferation of Raji and Jurkat cells by inducing the cell cycle arrest in G(1) phase, but the effect of DAPT on Maver and Z138 cells was not obvious. The activity of Notch pathway could be inhibited by DAPT treatment through down-regulating the expression of Notch target gene Hes1. It is concluded that the abnormal expression and activation of Notch signal pathway play an important role in the proliferation of lymphoma cells. Notch may be likely a new target for the therapy of lymphoma.