[目的]综述新近发现的IDOL蛋白(Inducibledegrader of the low-density lipoprotein receptor)对低密度脂蛋白受体(low-densitylipoprotein receptor,LDLR)调节作用及肝X受体(LXR)-IDOL-LDLR轴在脂代谢平衡稳态中作用的研究进展。[方法...[目的]综述新近发现的IDOL蛋白(Inducibledegrader of the low-density lipoprotein receptor)对低密度脂蛋白受体(low-densitylipoprotein receptor,LDLR)调节作用及肝X受体(LXR)-IDOL-LDLR轴在脂代谢平衡稳态中作用的研究进展。[方法]查阅近年来国内外研究IDOL及LXRIDOL通路的相关文献,并归纳总结其在脂代谢中的作用。[结果]IDOL能在转录后水平介导LDLR及其家族其他成员(VLDLR、ApoER2)的泛素化降解,该作用独立于固醇调节元件结合蛋白(SREBP)途径且受LXR的调节。[结论]LXR-IDOL通路能通过IDOL依赖途径泛素化降解LDLR,调节LDLR水平及LDL摄取,从而在脂代谢平衡中发挥重要作用。LXR-IDOL-LDLR轴可能为脂质代谢紊乱及心血管疾病提供新的潜在治疗靶点。展开更多
Flavonoids have been reported to possess strong antioxidant activities that moderate endothelial dysfunction and demonstrate protective effects on cardiovascular disease. Our previous studies confirmed that flavonoids...Flavonoids have been reported to possess strong antioxidant activities that moderate endothelial dysfunction and demonstrate protective effects on cardiovascular disease. Our previous studies confirmed that flavonoids, including hesperidin, naringin and nobiletin, inhibited thrombogenesis and hypertension in stroke prone spontaneously hypertensive rats (SHRSP) by protecting the endothelium from the adverse effects of free radical formation. We have now further investigated the protective effects of myricetin and hesperidin on cerebral thrombosis and atherogenesis in apolipoprotein E (apoE) and lowdensity lipoprotein receptor (LDLR) deficient (Apoe-/- and Ldlr-/- double knockout) mice. Three groups of mice were fed high fat diet alone and high fat diet mixed with myricetin (100 mg/kg/day and 200 mg/kg/day) or glucosyl hesperidin (G-hesperidin;250 mg/kg/day and 500 mg/kg/day) for 8 weeks. There were no differences in body weight related to administration of the flavonoids. Thrombotic tendency was assessed using a He-Ne laser technique in the murine cerebral pial vessels. In addition, atherogenesis was quantified histologically after dissection of the aorta from each mouse and staining with Oil Red O solution. The percentages of stained area to whole area of dissected aorta were calculated as indices of anti-atherogenic activity. Both myricetin and G-hesperidin significantly inhibited thrombogenesis in vivo and significantly inhibited atherogenesis compared to control mice (p < 0.001). These findings demonstrated that daily intake of myricetin and hesperidin suppressed the development of atherogenesis and thrombogenesis, possibly associated with the potent antioxidant effects of the flavonoids.展开更多
文摘[目的]综述新近发现的IDOL蛋白(Inducibledegrader of the low-density lipoprotein receptor)对低密度脂蛋白受体(low-densitylipoprotein receptor,LDLR)调节作用及肝X受体(LXR)-IDOL-LDLR轴在脂代谢平衡稳态中作用的研究进展。[方法]查阅近年来国内外研究IDOL及LXRIDOL通路的相关文献,并归纳总结其在脂代谢中的作用。[结果]IDOL能在转录后水平介导LDLR及其家族其他成员(VLDLR、ApoER2)的泛素化降解,该作用独立于固醇调节元件结合蛋白(SREBP)途径且受LXR的调节。[结论]LXR-IDOL通路能通过IDOL依赖途径泛素化降解LDLR,调节LDLR水平及LDL摄取,从而在脂代谢平衡中发挥重要作用。LXR-IDOL-LDLR轴可能为脂质代谢紊乱及心血管疾病提供新的潜在治疗靶点。
文摘Flavonoids have been reported to possess strong antioxidant activities that moderate endothelial dysfunction and demonstrate protective effects on cardiovascular disease. Our previous studies confirmed that flavonoids, including hesperidin, naringin and nobiletin, inhibited thrombogenesis and hypertension in stroke prone spontaneously hypertensive rats (SHRSP) by protecting the endothelium from the adverse effects of free radical formation. We have now further investigated the protective effects of myricetin and hesperidin on cerebral thrombosis and atherogenesis in apolipoprotein E (apoE) and lowdensity lipoprotein receptor (LDLR) deficient (Apoe-/- and Ldlr-/- double knockout) mice. Three groups of mice were fed high fat diet alone and high fat diet mixed with myricetin (100 mg/kg/day and 200 mg/kg/day) or glucosyl hesperidin (G-hesperidin;250 mg/kg/day and 500 mg/kg/day) for 8 weeks. There were no differences in body weight related to administration of the flavonoids. Thrombotic tendency was assessed using a He-Ne laser technique in the murine cerebral pial vessels. In addition, atherogenesis was quantified histologically after dissection of the aorta from each mouse and staining with Oil Red O solution. The percentages of stained area to whole area of dissected aorta were calculated as indices of anti-atherogenic activity. Both myricetin and G-hesperidin significantly inhibited thrombogenesis in vivo and significantly inhibited atherogenesis compared to control mice (p < 0.001). These findings demonstrated that daily intake of myricetin and hesperidin suppressed the development of atherogenesis and thrombogenesis, possibly associated with the potent antioxidant effects of the flavonoids.
