Salvianolic acid B ameliorates atherosclerosis via inhibiting YAP/TAZ/JNK signaling pathway in endothelial cells and pericytes.

Atherosclerosis (AS) is a chronic disease of the arterial wall where both innate and adaptive immunoinflammatory mechanisms are involved. Inflammation plays an important role in the pathological process of atherosclerosis at various stages. Yes-associated protein (YAP) and transcriptional coactivator with PDZ-binding motif (TAZ, also known as WWTR1) behave as a novel drug target against atherosclerosis. Therefore, the mechanism relationship of YAP/TAZ, inflammation and AS was explored in this study. Experiments demonstrated that serine dephosphorylation and nuclear translocation of YAP was increased in ECs and pericytes induced by oxidative low-density lipoprotein (ox-LDL), while the inhibition of YAP degraded the expression of downstream inflammatory factors. The expression of YAP/TAZ and inflammation proteins (JNK, NF-κB and TNF-α) in ECs and pericytes was suppressed through the application of Sal-B. Besides, Sal-B protects ECs and pericytes from oxidative stress and apoptosis. In vivo, Sal-B reduced en face and aortic root sinus lesions size, and decreased the expression of inflammation related factors (IL-6, IL-1β, TNF-α) and ox-LDL in serum sample of ApoE-/- mice fed a high fat diet. Therefore, our work provides a potential therapeutic strategy of using Sal-B to attenuate the development of atherosclerosis, the anti-atherosclerosis effects of Sal-B is related to regulate YAP/TAZ/JNK signaling pathway.