BackgroundOxidized low-density lipoprotein (ox-LDL)-induced an endothelial cell dysfunction is a significant event in the progression of atherosclerosis[1]. Even myricetin (Myr) has been exhibited strong antioxidant potency, the effect on atherosclerosis is still elusive. MethodsHUVECs were subjected to ox-LDL, before which cells were preconditioned with Myr. Cell Counting Kit-8 (CCK-8) assay, flow cytometry, quantitative real-time polymerase chain reaction (qRT-PCR) and Western blot were carried out to assess the impacts of ox-LDL and Myr on HUVECs. The expression of EndMT markers was determined by Western blot analysis and immunocytochemistry. In addition, the relationship of GAS5 and miR-29a-3p was evaluated by RNA Fluorescent in Situ Hybridization (FISH) and RNA immunoprecipitation (RIP) assay. ResultsMyr preconditioning prevented ox-LDL-induced apoptosis, inflammatory response, and EndMT. GAS5 was upregulated in response to ox-LDL while it was down-regulated by Myr preconditioning. GAS5 over-expression attenuates Myr protective effects against ox-LDL–mediated HUVEC injury. Besides, miR-29a-3p is a target of GAS5 and down-regulated miR-29a-3p could further resuced the effects of GAS5 in ox-LDL–mediated HUVEC. Furthermore, Myr inactivated the TLR4/NF-κB signaling pathway in ox-LDL-treated HUVEC by down-regulating GAS5 or upregulating miR-26a-5p. ConclusionMyr possessed an anti-inflammatory and anti-EndMT function against ox-LDL-induced HUVEC injury by regulating the GAS5/miR-29a-3p, indicating that Myr may have an important therapeutic function for atherosclerosis.

Background Triglyceride and glucose index (TYG) and triglyceride to high density lipoprotein cholesterol ratio (TG/HDL-c) not only were significant association with hypertension, but also were related to prehypertension. However, few of these studies have large subjects to study the relationship between TyG ,TG/HDL and hypertension, prehypertension in the same population. Therefore, We conducted a large cross-sectional study to explore the association of TG/HDL-c, TyG index with prehypertension and hypertension in the same normoglycemic subjects from China, Tianjin . Methods A total of 32,124 adults were eligible for this study. According to the level of blood pressure, the enrolled individuals were divided into three groups, Which were normotension, prehypertension and hypertension. All participants completed a questionnaire, followed by a physical examination and blood sample test. Spearman’s correlation analysis was used to determine the correlation between TyG index, TG/HDL-c and their related parameters, Multiple Logistic regression analyses were applied to explore the association of TyG indexes and TG/HDL quartiles with prehypertension and hypertension. Results The association between TyG index ,TG/HDL-c and age, heart rate(HR),Body Mass Index(BMI), systolic blood pressure(SBP), diastolic blood pressure(DBP), total cholesterol(TC), triglycerides(TG), LDL-cholesterol(LDL-c), fasting glucose(GLU) were positive correlation, while HDL-cholesterol(HDL-c) was negative correlation in spearman correlation analysis(p < 0.001). In multiple logistic regression analysis, there was a significant difference in the risk of prehypertension and hypertension when comparing the highest TyG index to the lowest TyG index and corresponding ORs were 1.795(1.638,1.968) and 2.439(2.205,2.698), respectively. For TG/HDL-c, the corresponding ORs were 1.514(1.382,1.658) and 1.934(1.751,2.137), respectively. Furthermore, When comparing the fourth quartile to the first quartile of TyG and TG/HDL, respectively, and both corresponding ORs of hypertension were higher than prehypertension. Conclusions Elevated TyG index and TG/HDL-c levels were associated with an increased risk of incident Prehypertension and Hypertension in normoglycemic individuals. They have the potential to become cost-effective and complementary monitors in the hierarchical management of prehypertension and hypertension.