Abstract
Purple sweet potato color (PSPC), flavonoids isolated from purple sweet potato, has been well demonstrated for the pharmacological properties. In the
present study, we attempt to explore whether the antisenescence was involved in PSPC-mediated protection against endothelium dysfunction in type 2 diabetes
mellitus (12DM) and, if involved, what are the possible mechanisms. The results showed that atherogenesis and endothelial senescence in the thoracic aorta
were promoted in mice with prediabetes: meanwhile. PSPC attenuated the deterioration of vascular vessel and inhibited the endothelial senescence. Diabetes
mellitus is a documented high -risk factor for the development of atherosclerosis. Studies show that o -galactose (o -gal) promotes endothelial cell senescence
in vitro.
In our study, we have determined that PSPC could suppress the o -gal -induced premature senescence and the abnormal endothelial function, discovered
in the early stages of atherosclerosis induced by 12DM. We have discovered that the PSPC down -regulates reactive oxygen species (ROS) accumulation and the
NLRP3 inflammasome functions. Furthermore, the premature senescence induced by o -gal was inhibited after attenuation of ROS and deactivation of NLRP3
inflammasomes. However, once the NLRP3 inflammasomes are overactivated. PSPC could not restrain cell
senescence.
These data imply that the beneficial effects
of PSPC on diabetes -induced endothelial dysfunction and
senescence
are mediated through ROS and NLRP3 signaling pathways, suggesting a potential target for
the prevention of endothelial senescence -related cardiovascular diseases.