HDL Inhibited Atherosclerosis Induced by Radiation Injury

Abstract

Background- HDL inhibits atherosclerosis development from radiation damage, nonetheless, the underlying mechanism is yet to be defined.Methods-This study used radiation patients along with cultured mouse aortic endothelial cells (MAECs) to investigate the process. Firstly, 158 patients from the oncology department of Jingzhou hospital who received radiation after neck cancers participated, and their arterial function was monitored by B ultrasound. Similarly, HDL and other blood lipid indexes were also tested. Then, MAECs were isolated and cultured and passed through MTT assay to test the HDL protective role on UVB radiation along with western blotting to test some apoptosis protein expression and possible molecules.Results-Firstly, those patients with high HDL levels were less likely to develop atherosclerosis, with statistical differences. We observed that MAECs treated with UVB were damaged significantly however HDL reversed the cell damage in a dose-depended manner. In the meantime, the apoptosis process was assessed and found that HDL inhibited the apoptosis caused by UVB. Western blotting results showed that HDL enhanced phosphatidylinositol 3-kinase (PI3K) in addition to Akt phosphorylation in MAECs.Conclusion-These results suggest that HDL protected UVB-mediated apoptosis by activation of a mechanism involving PI3K/Akt signaling pathway.