Methoxyl methyl ether isoamylene quercetin （MIAQ） is one of the newly synthesized quercetin derivatives. The present study investigated the effect of MIAQ on rat aorta endothelial cells （RAECs） injured by hydrogen...Methoxyl methyl ether isoamylene quercetin （MIAQ） is one of the newly synthesized quercetin derivatives. The present study investigated the effect of MIAQ on rat aorta endothelial cells （RAECs） injured by hydrogen peroxide （H2O2）, as well as the potential mechanisms. We observed that MIAQ at 2.5-10μmol/L significantly enhanced the viability of injured RAECs, and the effect was more potent than quercetin and ct-tocopherol. However, M1AQ at the same concentration failed to show anti-oxidant activity in a cell-free system. In H2O2-injured endothelial cells treated with MIAQ （5-10μmol/L）, the level of nitric oxide （NO） and malondialdehyde was decreased, and the activities of superoxide dismutase and glutathione peroxidase was enhanced. In addition, RAECs treated with MIAQ （2.5-10 μmol/L） exhibited significant inhibiting apoptosis. In conclusion, MIAQ had protective effect on RAECs, possibly through increasing NO production and antioxidases activities, as well as inhibiting apoptosis. These findings suggest that MIAQ is possibly beneficial in the prevention of atherosclerosis and other diseases related to endothelial injury.展开更多
Objective To study the effects of estrogen level and cholesterol - rich diet on the expression of estrogen receptor (ER) in cardiovascular tissues including vascular endothelial cells (VEC) of female rats. Methods The...Objective To study the effects of estrogen level and cholesterol - rich diet on the expression of estrogen receptor (ER) in cardiovascular tissues including vascular endothelial cells (VEC) of female rats. Methods The receptor binding assay (RBA) was adopted to measure the estrogen receptor level in aortic wall, heart and vascular endothelial cells of female rats on a cholesterol - rich diet. A ra-dioimmunoassay was employed to measure the level of serum estradiol. Results The number of ER significantly decreased in hearts, aorta and vascular endothelial cells in the ovariectomized rats and the rats on a cholesterol - rich diet. In contrast, the administration of estrogen somewhat restored the expression of ER. Conclusions For female rats, the level of estrogen affects the expression of ER in cardiovascular system. The number of ER decreases along with the decrease in the level of estrogen. A cholesterol - rich diet also can decrease the expression of ER in cardiovascular system of female rats.展开更多
基金National Natural Science Foundation of China (Grant No. 61071002)
文摘Methoxyl methyl ether isoamylene quercetin （MIAQ） is one of the newly synthesized quercetin derivatives. The present study investigated the effect of MIAQ on rat aorta endothelial cells （RAECs） injured by hydrogen peroxide （H2O2）, as well as the potential mechanisms. We observed that MIAQ at 2.5-10μmol/L significantly enhanced the viability of injured RAECs, and the effect was more potent than quercetin and ct-tocopherol. However, M1AQ at the same concentration failed to show anti-oxidant activity in a cell-free system. In H2O2-injured endothelial cells treated with MIAQ （5-10μmol/L）, the level of nitric oxide （NO） and malondialdehyde was decreased, and the activities of superoxide dismutase and glutathione peroxidase was enhanced. In addition, RAECs treated with MIAQ （2.5-10 μmol/L） exhibited significant inhibiting apoptosis. In conclusion, MIAQ had protective effect on RAECs, possibly through increasing NO production and antioxidases activities, as well as inhibiting apoptosis. These findings suggest that MIAQ is possibly beneficial in the prevention of atherosclerosis and other diseases related to endothelial injury.
文摘Objective To study the effects of estrogen level and cholesterol - rich diet on the expression of estrogen receptor (ER) in cardiovascular tissues including vascular endothelial cells (VEC) of female rats. Methods The receptor binding assay (RBA) was adopted to measure the estrogen receptor level in aortic wall, heart and vascular endothelial cells of female rats on a cholesterol - rich diet. A ra-dioimmunoassay was employed to measure the level of serum estradiol. Results The number of ER significantly decreased in hearts, aorta and vascular endothelial cells in the ovariectomized rats and the rats on a cholesterol - rich diet. In contrast, the administration of estrogen somewhat restored the expression of ER. Conclusions For female rats, the level of estrogen affects the expression of ER in cardiovascular system. The number of ER decreases along with the decrease in the level of estrogen. A cholesterol - rich diet also can decrease the expression of ER in cardiovascular system of female rats.
