The Notch signal path is involved in the protection of radiation-induced apoptosis of C17.2 neural stem cells by exogenous basic fibroblast growth factor

Abstract

Objective To observe the effects of exogenous basic fibroblast growth factor (bFGF) on radiation-induced apoptosis of C17.2 neural stem cells(NSCs) with γ-secretase inhibitor(DAPT) condition and explore the relationship between bFGF and Notch signal pathway. Methods The cell viability was detected by using the MTT method.After the cells attached to the flasks, different concentrations of DAPT was added in accordance with the experimental design and cultured cells for 24 h. C17.2 NSCs were subjected to irradiation exposure by linear accelerator and treated with bFGF (40 ng/ml) 5 min after the exposure. After 48 hours, the apoptosis of cells was detected by using Flow Cytometry. Results After adding in DAPT , the cells growth was inhibited and depended on the concentrations of DAPT.Compared with the control group, all groups had statistically significant differences(P<0.05). Flow cytometry showed compared with the control group all groups had significant differences (P<0.05). The apoptosis rate was (11.53±0.81)% in radiation group, (7.18±0.0.94)% in radiation+ bFGF group, (9.82±0.77)% in DAPT group, (21.45±0.98)% in Radiation+ DAPT group and (10.26±1.03)% in Radiation+ DAPT + bFGF group.Between Radiation + bFGF group and Radiation group, it had statistically significant difference(P<0.05). The pairwise comparisons of DAPT group and Radiation + DAPT group which had the same DAPT concentration had statistically significant differences(P<0.05). The pairwise comparisons of Radiation + DAPT+ bFGF group and Radiation + DAPT group which had the same DAPT concentration had statistically significant difference(P<0.05). Conclusion Exogenous bFGF can inhibit apoptosis of C17.2 NSCs. Notch signaling pathway inhibitor DAPT can promote apoptosis of C17.2 NSCs which are subjected to irradiation exposure by linear accelerator and bFGF can weak apoptosis.bFGF protective effect on radiation-induced neural stem cells may be related to the Notch signaling pathway. Key words: Notch signal pathway; Basic fibroblast growth factor; Neural stem cells; Radiation injury