The molecular mechanism of how hepatocytes maintain cholesterol homeostasis has become much more transparent with the discovery of sterol regulatory element binding proteins (SREBPs) in recent years. These membrane pr...The molecular mechanism of how hepatocytes maintain cholesterol homeostasis has become much more transparent with the discovery of sterol regulatory element binding proteins (SREBPs) in recent years. These membrane proteins aremembers of the basic helix-loop-helix-leucine zipper (bHLHZip) family of transcription factors. They activate the expression of at least 30 genes involved in the synthesis of cholesterol and lipids. SREBPs are synthesized as precursor proteins in the endoplasmic reticulum (ER), where they form a complex with another protein, SREBP cleavage activating protein (SCAP). The SCAP molecule contains a sterol sensory domain. In the presence of high cellular sterol concentrations SCAP confines SREBP to the ER. With low cellular concentrations, SCAP escorts SREBP to activation in the Golgi. There, SREBP undergoes two proteolytic cleavage steps to release the mature, biologically active transcription factor, nuclear SREBP (nSREBP). nSREBP translocates to the nucleus and binds to sterol response elements (SRE) in the promoter/enhancer regions of target genes. Additional transcription factors are required to activate transcription of these genes. Three different SREBPs are known, SREBPs-1a, -1c and -2. SREBP-1a and -1c are isoforms produced from a single gene by alternate splicing. SREBP-2 is encoded by a different gene and does not display any isoforms. It appears that SREBPs alone, in the sequence described above, can exert complete control over cholesterol synthesis, whereas many additional factors (hormones, cytokines, etc.) are required for complete control of lipid metabolism. Medicinal manipulation of the SREBP/SCAP system is expected to prove highly beneficial in the management of cholesterol-related disease.展开更多
Fuzhuan brick-tea(FZT)has long been consumed for its supposed weight loss and lipid-lowering benefi ts.In this study,we show that the regulation of fat storage in Caenorhabditis elegans from a water extract of FZT was...Fuzhuan brick-tea(FZT)has long been consumed for its supposed weight loss and lipid-lowering benefi ts.In this study,we show that the regulation of fat storage in Caenorhabditis elegans from a water extract of FZT was affected by cholesterol levels.We found that FZT signifi cantly decreased fat storage under normal cholesterol levels or in a cholesterol-free diet,while lipid accumulation was increased for a high cholesterol diet.Moreover,this mechanism may involve the conserved sterol regulatory element-binding protein(SREBP)/mediator-15(MDT-15)signaling pathway and the nuclear hormone receptor NHR-80.In addition,lipid synthesis-related genes inhibited by FZT were partially affected by a cholesterol-free diet.Thus,our fi ndings suggested that the potential lipid-lowering effects of FZT may depend on the cholesterol level,which may help to improve the consumption of FZT.展开更多
Plasma cholesterol level is determined by a complex dynamics that involves transport lipoproteins which levels are tightly dependent on how the liver and the intestine regulate cholesterol and biliary acid metabolism....Plasma cholesterol level is determined by a complex dynamics that involves transport lipoproteins which levels are tightly dependent on how the liver and the intestine regulate cholesterol and biliary acid metabolism. Regulation of cholesterol and biliary acids by the liver and the intestine is in turn coupled to a large array of enzymes and transporters that largely influence the inflow and the outflow of cholesterol and biliary acids through these organs. The activity of the key regulators of cholesterol and biliary acids may be influenced by several external factors such as pharmacological drugs and the nutritional status. In recent years, more information has been gathered about the impact of estrogens on regulation of cholesterol in the body. Exposure to high levels of estrogens has been reported to promote cholesterol gallstone formation and women are twice as likely as men to develop cholesterol gallstones. The impact of estrogen withdrawal, such as experienced by menopausal women, is therefore of importance and more information on how the absence of estrogens influence cholesterol regulation is started to come out, especially through the use of animal models. An interesting alternative to metabolic deterioration due to estrogen deficiency is exercise training. The present review is intended to summarize the present information that links key regulators of cholesterol and biliary acid pathways in liver and intestine to the absence of estrogens in an animal model and to discuss the potential role of exercise training as an alternative.展开更多
AIM:To study the effect of Daxx on cholesterol accumulation in hepatic cells. METHODS: Sprague Dawley (SD) rats were fed a normal or high fat diet for 6 wk, and serum lipids and Daxx expression of hepatic tissues were...AIM:To study the effect of Daxx on cholesterol accumulation in hepatic cells. METHODS: Sprague Dawley (SD) rats were fed a normal or high fat diet for 6 wk, and serum lipids and Daxx expression of hepatic tissues were measured by immunoblot assays. HepG2 cells were transfected with the pEGFP-C1/Daxx or pEGFP-C1 plasmid. Cells stably transfected with Daxx were identified by RT- PCR analysis. Total cholesterol levels were determined by high performance liquid chromatography. Activated- SREBP and caveolin-1 were assayed by western blotting. RESULTS: Hepatic Daxx protein was higher in normal rats than in high fat diet-fed rats. Noticeable negative correlations were seen between Daxx and LDL-C (γ = -7.56, P = 0.018), and between Daxx and TC (γ = -9.07, P = 0.01), respectively. The total cholesterol of HepG2/GFP-Daxx cells was lower than that of control cells or HepG2/GFP cells (9.28 ± 0.19 vs 14.36 ± 4.45 or 13.94 ± 2.62, both P < 0.05). Furthermore, in HepG2/GFP cells, the expression of activated SREBP was lower than that of control cells, whereas caveolin-1 expression was higher. CONCLUSION: Overexpression of Daxx in HepG2 cells decreased intracellular cholesterol accumulation, which might be associated with inhibition of SREBP activity and an increase in caveolin-1 expression.展开更多
抗精神病药物是治疗精神分裂症的主要药物,但其使用会导致脂代谢紊乱,从而增加患者发生心血管疾病的风险,缩短患者的预期寿命,并严重影响治疗的依从性。目前,抗精神病药物引起脂代谢紊乱的具体机制尚不清楚。固醇调节元件结合蛋白(stero...抗精神病药物是治疗精神分裂症的主要药物,但其使用会导致脂代谢紊乱,从而增加患者发生心血管疾病的风险,缩短患者的预期寿命,并严重影响治疗的依从性。目前,抗精神病药物引起脂代谢紊乱的具体机制尚不清楚。固醇调节元件结合蛋白(sterol regulatory element binding protein,SREBP)是调控脂代谢的关键转录因子。前蛋白转化酶枯草溶菌素9(proprotein convertase subtilisin/kexin type 9,PCSK9)作为SREBP下游调控基因之一,对低密度脂蛋白胆固醇(low density lipoprotein cholesterol,LDL-C)具有重要的调控作用,是最近降脂药物研究的重要靶点。近期研究表明,抗精神病药物可以通过SREBP/PCSK9通路影响脂代谢。深入了解该通路在抗精神药物相关代谢异常中的作用机制将促进精神分裂症患者脂代谢紊乱的预防和新药的研发应用。展开更多
目的:探讨血清固醇调节元件结合蛋白2(sterol regulatory element binding protein-2,SREBP-2)与急性脑梗死的相关性。方法:纳入2020年10月至2021年3月入住的134名急性脑梗死患者和34名健康体检者。通过酶联免疫吸附实验法(enzyme-linke...目的:探讨血清固醇调节元件结合蛋白2(sterol regulatory element binding protein-2,SREBP-2)与急性脑梗死的相关性。方法:纳入2020年10月至2021年3月入住的134名急性脑梗死患者和34名健康体检者。通过酶联免疫吸附实验法(enzyme-linked immunosorbent assay,ELISA)检测血清SERBP-2浓度,并依据急性卒中Org 10172治疗试验(trial of Org 10172 in acute stroke treatment,TOAST)分型和是否合并糖尿病进行亚组分析。使用美国国立卫生研究院卒中量表(National Institutes of Health Stroke Scale,NIHSS)评分评估患者的病情严重程度,并分析血清SREBP-2与病情严重程度的相关性。使用改良Rankin量表评估患者的90 d功能预后,并将患者分为预后良好组和预后不良组,比较2组的血清SREBP-2浓度差异,并通过logistic回归分析血清SREBP-2是否与脑梗死预后相关。结果:脑梗死组的血清SREBP-2浓度明显低于对照组[72.60(57.50,83.35)ng/mL vs.86.80(77.20,97.90)ng/mL,P=0.000]。血清SREBP-2浓度识别急性脑梗死患者和健康人群的曲线下面积为0.782(P=0.000)。大动脉粥样硬化型、心源性栓塞型、小动脉闭塞型脑梗死血清SREBP-2浓度均明显低于对照组(P=0.000,P=0.003,P=0.000)。合并糖尿病患者的血清SREBP-2高于不合并糖尿病的患者(P=0.021)。血清SREBP-2浓度与入院NIHSS评分无相关性(P>0.05)。脑梗死患者预后良好组血清SREBP-2浓度较预后不良组低,但差异无统计学意义(P>0.05),logistic回归分析显示血清SREBP-2浓度与脑梗死90 d功能预后无关(OR=1.016,95%CI=0.991~1.042,P=0.205)。结论:血清SREBP-2浓度在急性脑梗死患者中明显下降。血清SREBP-2对识别脑梗死患者与健康人群具有一定的效能。然而,血清SREBP-2浓度与患者病情严重程度和预后无关。展开更多
文摘The molecular mechanism of how hepatocytes maintain cholesterol homeostasis has become much more transparent with the discovery of sterol regulatory element binding proteins (SREBPs) in recent years. These membrane proteins aremembers of the basic helix-loop-helix-leucine zipper (bHLHZip) family of transcription factors. They activate the expression of at least 30 genes involved in the synthesis of cholesterol and lipids. SREBPs are synthesized as precursor proteins in the endoplasmic reticulum (ER), where they form a complex with another protein, SREBP cleavage activating protein (SCAP). The SCAP molecule contains a sterol sensory domain. In the presence of high cellular sterol concentrations SCAP confines SREBP to the ER. With low cellular concentrations, SCAP escorts SREBP to activation in the Golgi. There, SREBP undergoes two proteolytic cleavage steps to release the mature, biologically active transcription factor, nuclear SREBP (nSREBP). nSREBP translocates to the nucleus and binds to sterol response elements (SRE) in the promoter/enhancer regions of target genes. Additional transcription factors are required to activate transcription of these genes. Three different SREBPs are known, SREBPs-1a, -1c and -2. SREBP-1a and -1c are isoforms produced from a single gene by alternate splicing. SREBP-2 is encoded by a different gene and does not display any isoforms. It appears that SREBPs alone, in the sequence described above, can exert complete control over cholesterol synthesis, whereas many additional factors (hormones, cytokines, etc.) are required for complete control of lipid metabolism. Medicinal manipulation of the SREBP/SCAP system is expected to prove highly beneficial in the management of cholesterol-related disease.
基金supported by the National Natural Science Foundation of China(31801547)Some C.elegans strains were provided by CGC,which is funded by the NIH Office of Research Infrastructure Programs.
文摘Fuzhuan brick-tea(FZT)has long been consumed for its supposed weight loss and lipid-lowering benefi ts.In this study,we show that the regulation of fat storage in Caenorhabditis elegans from a water extract of FZT was affected by cholesterol levels.We found that FZT signifi cantly decreased fat storage under normal cholesterol levels or in a cholesterol-free diet,while lipid accumulation was increased for a high cholesterol diet.Moreover,this mechanism may involve the conserved sterol regulatory element-binding protein(SREBP)/mediator-15(MDT-15)signaling pathway and the nuclear hormone receptor NHR-80.In addition,lipid synthesis-related genes inhibited by FZT were partially affected by a cholesterol-free diet.Thus,our fi ndings suggested that the potential lipid-lowering effects of FZT may depend on the cholesterol level,which may help to improve the consumption of FZT.
基金Supported by The Natural Sciences and Engineering Research Council of Canada,No.NSERC 7594
文摘Plasma cholesterol level is determined by a complex dynamics that involves transport lipoproteins which levels are tightly dependent on how the liver and the intestine regulate cholesterol and biliary acid metabolism. Regulation of cholesterol and biliary acids by the liver and the intestine is in turn coupled to a large array of enzymes and transporters that largely influence the inflow and the outflow of cholesterol and biliary acids through these organs. The activity of the key regulators of cholesterol and biliary acids may be influenced by several external factors such as pharmacological drugs and the nutritional status. In recent years, more information has been gathered about the impact of estrogens on regulation of cholesterol in the body. Exposure to high levels of estrogens has been reported to promote cholesterol gallstone formation and women are twice as likely as men to develop cholesterol gallstones. The impact of estrogen withdrawal, such as experienced by menopausal women, is therefore of importance and more information on how the absence of estrogens influence cholesterol regulation is started to come out, especially through the use of animal models. An interesting alternative to metabolic deterioration due to estrogen deficiency is exercise training. The present review is intended to summarize the present information that links key regulators of cholesterol and biliary acid pathways in liver and intestine to the absence of estrogens in an animal model and to discuss the potential role of exercise training as an alternative.
基金The National Natural Science Foundation of China, No. 30470719 and 30600249The National Major Basic Research Program of China (973), No. 2006CB503808The Sanitarian Research Foundation of Hunan province, No. B2004-078
文摘AIM:To study the effect of Daxx on cholesterol accumulation in hepatic cells. METHODS: Sprague Dawley (SD) rats were fed a normal or high fat diet for 6 wk, and serum lipids and Daxx expression of hepatic tissues were measured by immunoblot assays. HepG2 cells were transfected with the pEGFP-C1/Daxx or pEGFP-C1 plasmid. Cells stably transfected with Daxx were identified by RT- PCR analysis. Total cholesterol levels were determined by high performance liquid chromatography. Activated- SREBP and caveolin-1 were assayed by western blotting. RESULTS: Hepatic Daxx protein was higher in normal rats than in high fat diet-fed rats. Noticeable negative correlations were seen between Daxx and LDL-C (γ = -7.56, P = 0.018), and between Daxx and TC (γ = -9.07, P = 0.01), respectively. The total cholesterol of HepG2/GFP-Daxx cells was lower than that of control cells or HepG2/GFP cells (9.28 ± 0.19 vs 14.36 ± 4.45 or 13.94 ± 2.62, both P < 0.05). Furthermore, in HepG2/GFP cells, the expression of activated SREBP was lower than that of control cells, whereas caveolin-1 expression was higher. CONCLUSION: Overexpression of Daxx in HepG2 cells decreased intracellular cholesterol accumulation, which might be associated with inhibition of SREBP activity and an increase in caveolin-1 expression.
基金This work was supported by grants from the National Natural Science Foundation of China ( No. 81173047 and No. 31371161 ) and the Natural Science Foundation of Hunan (No. 12JJ5068).
文摘抗精神病药物是治疗精神分裂症的主要药物,但其使用会导致脂代谢紊乱,从而增加患者发生心血管疾病的风险,缩短患者的预期寿命,并严重影响治疗的依从性。目前,抗精神病药物引起脂代谢紊乱的具体机制尚不清楚。固醇调节元件结合蛋白(sterol regulatory element binding protein,SREBP)是调控脂代谢的关键转录因子。前蛋白转化酶枯草溶菌素9(proprotein convertase subtilisin/kexin type 9,PCSK9)作为SREBP下游调控基因之一,对低密度脂蛋白胆固醇(low density lipoprotein cholesterol,LDL-C)具有重要的调控作用,是最近降脂药物研究的重要靶点。近期研究表明,抗精神病药物可以通过SREBP/PCSK9通路影响脂代谢。深入了解该通路在抗精神药物相关代谢异常中的作用机制将促进精神分裂症患者脂代谢紊乱的预防和新药的研发应用。
文摘目的:探讨血清固醇调节元件结合蛋白2(sterol regulatory element binding protein-2,SREBP-2)与急性脑梗死的相关性。方法:纳入2020年10月至2021年3月入住的134名急性脑梗死患者和34名健康体检者。通过酶联免疫吸附实验法(enzyme-linked immunosorbent assay,ELISA)检测血清SERBP-2浓度,并依据急性卒中Org 10172治疗试验(trial of Org 10172 in acute stroke treatment,TOAST)分型和是否合并糖尿病进行亚组分析。使用美国国立卫生研究院卒中量表(National Institutes of Health Stroke Scale,NIHSS)评分评估患者的病情严重程度,并分析血清SREBP-2与病情严重程度的相关性。使用改良Rankin量表评估患者的90 d功能预后,并将患者分为预后良好组和预后不良组,比较2组的血清SREBP-2浓度差异,并通过logistic回归分析血清SREBP-2是否与脑梗死预后相关。结果:脑梗死组的血清SREBP-2浓度明显低于对照组[72.60(57.50,83.35)ng/mL vs.86.80(77.20,97.90)ng/mL,P=0.000]。血清SREBP-2浓度识别急性脑梗死患者和健康人群的曲线下面积为0.782(P=0.000)。大动脉粥样硬化型、心源性栓塞型、小动脉闭塞型脑梗死血清SREBP-2浓度均明显低于对照组(P=0.000,P=0.003,P=0.000)。合并糖尿病患者的血清SREBP-2高于不合并糖尿病的患者(P=0.021)。血清SREBP-2浓度与入院NIHSS评分无相关性(P>0.05)。脑梗死患者预后良好组血清SREBP-2浓度较预后不良组低,但差异无统计学意义(P>0.05),logistic回归分析显示血清SREBP-2浓度与脑梗死90 d功能预后无关(OR=1.016,95%CI=0.991~1.042,P=0.205)。结论:血清SREBP-2浓度在急性脑梗死患者中明显下降。血清SREBP-2对识别脑梗死患者与健康人群具有一定的效能。然而,血清SREBP-2浓度与患者病情严重程度和预后无关。