目的研究固醇调节元件结合蛋白1c(sterol regulatory element binding protein 1c,SREBP1c)对肠道糖异生的调控作用。方法饥饿处理C57BL/6小鼠、SREBP1c纯合敲除型(SREBP1c-KO)和同窝野生型(SREBP1c-WT)小鼠,通过qPCR、Western blot检...目的研究固醇调节元件结合蛋白1c(sterol regulatory element binding protein 1c,SREBP1c)对肠道糖异生的调控作用。方法饥饿处理C57BL/6小鼠、SREBP1c纯合敲除型(SREBP1c-KO)和同窝野生型(SREBP1c-WT)小鼠,通过qPCR、Western blot检测糖异生途径限速酶葡萄糖-6-磷酸酶(glucose-6-phosphatase catalytic,G6PC)和磷酸烯醇式丙酮酸羧激酶(phosphoenolpyruvate carboxykinase 1,PCK1)在肝脏、空肠和回肠组织中的表达水平;在肠上皮细胞CaCo-2中过表达或敲低SREBP1c,检测细胞内G6PC和PCK1表达水平。结果饥饿处理后,C57BL/6小鼠空肠、回肠组织中G6PC、PCK1和SREBP1c表达水平均显著增加(P<0.05)。SREBP1c基因敲除后,小鼠空肠、回肠组织中由饥饿诱导的糖异生限速酶G6PC和PCK1的表达明显下调(P<0.05)。在肠上皮细胞CaCo-2中过表达SREBP1c,可显著上调糖异生途径关键酶G6PC和PCK1的表达,促进细胞内葡萄糖的产生(P<0.05);反之,敲低SREBP1c的表达,可明显下调G6PC和PCK1,抑制细胞内葡萄糖的产生(P<0.05)。结论饥饿状态下,SREBP1c可调控肠上皮细胞中糖异生限速酶G6PC和PCK1的表达,进而影响葡萄糖的生成,表明SREBP1c可能参与肠道糖异生的调控,机制有待进一步探索。展开更多
目的筛选影响胆固醇调节元件结合蛋白1a(cholesterol regulatory element binding protein,SREBP1a)蛋白稳定性的去泛素化酶,并探索其调控机制。方法通过去泛素化酶库筛选显著影响SREBP1a表达的去泛素化酶,免疫蛋白印记实验和实时荧光定...目的筛选影响胆固醇调节元件结合蛋白1a(cholesterol regulatory element binding protein,SREBP1a)蛋白稳定性的去泛素化酶,并探索其调控机制。方法通过去泛素化酶库筛选显著影响SREBP1a表达的去泛素化酶,免疫蛋白印记实验和实时荧光定量PCR(qRT-PCR)评估去泛素化酶对SREBP1a以及升脂基因表达的影响;通过红色荧光蛋白标记人源低密度脂蛋白(human Dil-low density lipoprotein,Human Dil-LDL)摄取和油红O染色等实验技术检测细胞摄取低密度脂蛋白(LDL)和脂质沉积情况。结果去泛素化酶库筛选发现泛素特异肽酶37(ubiquitin specific peptidase 37,USP37)可显著增加肝细胞SREBP1a蛋白表达水平,促进胆固醇摄取及脂质沉积。USP37基因敲除可显著降低SREBP1a蛋白表达水平,抑制升脂基因表达及脂质沉积。结论去泛素化酶USP37通过稳定SREBP1a蛋白表达,促进胆固醇摄取及脂质沉积,揭示了SREBP1a翻译后调控的新模式。展开更多
探究鸠坑龙井茶水提物(LJT)对小鼠肝组织脂质代谢SREBPs通路信号影响及肠道菌群的调节作用。通过高脂饮食诱导小鼠构建非酒精性脂肪肝(NAFL)模型,并给予LJT(300 mg·kg^(-1))灌胃干预。定期记录小鼠的体质量,检测小鼠血清生化指标...探究鸠坑龙井茶水提物(LJT)对小鼠肝组织脂质代谢SREBPs通路信号影响及肠道菌群的调节作用。通过高脂饮食诱导小鼠构建非酒精性脂肪肝(NAFL)模型,并给予LJT(300 mg·kg^(-1))灌胃干预。定期记录小鼠的体质量,检测小鼠血清生化指标和葡萄糖耐受水平,观察并分析Hematoxylin-Eosin(HE)染色、油红O染色肝组织切片特征;应用Real-time qPCR技术检测小鼠肝组织SREBPs通路7个基因(SREBP-1c、FAS、SCD-1、ACC-1、SREBP-2、HMGCR、PPARγ)的相对表达量,采用蛋白免疫印记技术(Western Blot)分析肝组织蛋白质表达水平,同时对小鼠肠道菌群进行高通量测序(16 S rDNA)并分析其结构。结果显示,LJT干预后小鼠体质量、血糖AUC、血清TG、TC、LDL-C和肝脏中TG、TC水平有显著下降,龙井组小鼠肝组织SREBP-1c、FAS、ACC-1、SCD-1和PPARγ蛋白表达水平降低,SREBP-1c、SCD-1、FAS、ACC-1、SREBP-2、HMGCR、PPARγ基因的相对表达量显著下调;16 S rDNA分析发现,小鼠肠道菌群门水平主要为Firmicutes、Bacteroidota、Desulfobacterota和Actinobacteriota 4类,LJT有效延缓了高脂饮食引起的Firmicutes相对丰度升高和Bacteroidota相对丰度下降趋势,并增加了肠道菌群的物种丰度。结果表明,LJT能够干预小鼠肝脂肪变性SREBPs通路信号表达,改善小鼠肠道菌群紊乱,具有降脂减肥作用。展开更多
Objective:To investigate the relationship between SREBP1 protein expression and clinicopathological features of hepatitis B virus infection-related hepatocellular carcinoma.Methods:A total of 91 cases of hepatocellula...Objective:To investigate the relationship between SREBP1 protein expression and clinicopathological features of hepatitis B virus infection-related hepatocellular carcinoma.Methods:A total of 91 cases of hepatocellular carcinoma associated with hepatitis B virus infection and paired adjacent liver tissue samples were collected from the Department of Pathology,the First Affiliated Hospital of Hainan Medical College.The expression of SREBP1 protein in cancer and paired adjacent tissues was detected by immunohistochemical staining.The relationship between SREBP1 protein expression and clinicopathological features of hepatocellular carcinoma was analyzed by chi-square test.Results:The results of immunohistochemical staining showed that the ex-pression of SREBP1 protein in hepatocellular carcinoma was significantly higher than that in adjacent liver tissues(P<0.001).The expression level of SREBP1 protein was significantly correlated with tumor differentiation,distant metastasis or local recurrence in patients with hepatocellular carcinoma(P<0.05).The expression of SREBP1 protein was significantly up-regulated in the high HBV-related HCC virus load group(>103 IU/mL)compared with the low HBV-related HCC virus load group 3(0~10 IU/mL)(P<0.05).Conclusion:1.The expression of SREBP1 protein is correlated with hepatocellular carcinoma,and shows a high expression trend,which provides direction and theoretical basis for the study of lipid metabolism regulation mechnism related to the occurrence and development of hepatocellular carcinoma.2.The expression of SREBP1 protein is correlated with the replication activity of hepatitis B virus,which provides a new research direction for the exploration of the mechanism of the occurrence and development of hepatitis B virus infection-related liver cancer.展开更多
目的分析CT联合叉头转录因子O家族1(Forkhead transcription factor 1;FoxO1)、胆固醇调节原件结合蛋白(Sterol-regulatory element binding proteins,SREBPs)表达对原发性肝癌伴乙肝患者的诊断效能。方法回顾性分析2020年1月至2022年7...目的分析CT联合叉头转录因子O家族1(Forkhead transcription factor 1;FoxO1)、胆固醇调节原件结合蛋白(Sterol-regulatory element binding proteins,SREBPs)表达对原发性肝癌伴乙肝患者的诊断效能。方法回顾性分析2020年1月至2022年7月临床超声检查提示肝脏局灶性病变患者54例为研究对象,手术病理金标准确诊乙肝肝硬化患者29例(乙肝组)、原发性肝癌合并乙肝25例(肝癌合并乙肝组),两组患者术前均行CT联合FoxO1、SREBP2诊断,比较组间FoxO1、SREBP2水平及CT影像征象,同时作ROC曲线分析模型预测价值。结果(1)原发性肝癌伴乙肝组患者门静脉血流灌注量(HPF)、肝动脉血流灌注量(HAF)及肝动脉灌注指数(HPI)水平均显著低于乙肝组患者,组间差异有统计学意义(P<0.05);(2)原发性肝癌伴乙肝组患者FoxO1、SREBP2阳性检出率均显著高于乙肝组,组间统计学意义成立(P<0.05);(3)原发性肝癌伴乙肝患者中,癌旁组织FoxO1阳性率(48.28%)高于肝癌组织(24.14%),肝癌组织SREBP2阳性率(51.72%)高于癌旁组织(24.14%),组间统计学意义成立(P<0.05);(4)ROC曲线结果显示,预测模型最佳临界值为0.090,ROC曲线下面积(area under curve,AUC)为0.614(0.651~0.731)、0.701(0.686~0.801)、0.697(0.651~0.779)、0.899(0.789~0.996)。结论原发性肝癌伴乙肝患者CT相关检查参数呈低水平表达,FoxO1、SREBP2阳性率更高,CT联合FoxO1、SREBP2诊断对原发性肝癌伴乙肝的敏感度更高,可用于预后评估,建议临床推广使用。展开更多
文摘目的研究固醇调节元件结合蛋白1c(sterol regulatory element binding protein 1c,SREBP1c)对肠道糖异生的调控作用。方法饥饿处理C57BL/6小鼠、SREBP1c纯合敲除型(SREBP1c-KO)和同窝野生型(SREBP1c-WT)小鼠,通过qPCR、Western blot检测糖异生途径限速酶葡萄糖-6-磷酸酶(glucose-6-phosphatase catalytic,G6PC)和磷酸烯醇式丙酮酸羧激酶(phosphoenolpyruvate carboxykinase 1,PCK1)在肝脏、空肠和回肠组织中的表达水平;在肠上皮细胞CaCo-2中过表达或敲低SREBP1c,检测细胞内G6PC和PCK1表达水平。结果饥饿处理后,C57BL/6小鼠空肠、回肠组织中G6PC、PCK1和SREBP1c表达水平均显著增加(P<0.05)。SREBP1c基因敲除后,小鼠空肠、回肠组织中由饥饿诱导的糖异生限速酶G6PC和PCK1的表达明显下调(P<0.05)。在肠上皮细胞CaCo-2中过表达SREBP1c,可显著上调糖异生途径关键酶G6PC和PCK1的表达,促进细胞内葡萄糖的产生(P<0.05);反之,敲低SREBP1c的表达,可明显下调G6PC和PCK1,抑制细胞内葡萄糖的产生(P<0.05)。结论饥饿状态下,SREBP1c可调控肠上皮细胞中糖异生限速酶G6PC和PCK1的表达,进而影响葡萄糖的生成,表明SREBP1c可能参与肠道糖异生的调控,机制有待进一步探索。
文摘目的筛选影响胆固醇调节元件结合蛋白1a(cholesterol regulatory element binding protein,SREBP1a)蛋白稳定性的去泛素化酶,并探索其调控机制。方法通过去泛素化酶库筛选显著影响SREBP1a表达的去泛素化酶,免疫蛋白印记实验和实时荧光定量PCR(qRT-PCR)评估去泛素化酶对SREBP1a以及升脂基因表达的影响;通过红色荧光蛋白标记人源低密度脂蛋白(human Dil-low density lipoprotein,Human Dil-LDL)摄取和油红O染色等实验技术检测细胞摄取低密度脂蛋白(LDL)和脂质沉积情况。结果去泛素化酶库筛选发现泛素特异肽酶37(ubiquitin specific peptidase 37,USP37)可显著增加肝细胞SREBP1a蛋白表达水平,促进胆固醇摄取及脂质沉积。USP37基因敲除可显著降低SREBP1a蛋白表达水平,抑制升脂基因表达及脂质沉积。结论去泛素化酶USP37通过稳定SREBP1a蛋白表达,促进胆固醇摄取及脂质沉积,揭示了SREBP1a翻译后调控的新模式。
文摘探究鸠坑龙井茶水提物(LJT)对小鼠肝组织脂质代谢SREBPs通路信号影响及肠道菌群的调节作用。通过高脂饮食诱导小鼠构建非酒精性脂肪肝(NAFL)模型,并给予LJT(300 mg·kg^(-1))灌胃干预。定期记录小鼠的体质量,检测小鼠血清生化指标和葡萄糖耐受水平,观察并分析Hematoxylin-Eosin(HE)染色、油红O染色肝组织切片特征;应用Real-time qPCR技术检测小鼠肝组织SREBPs通路7个基因(SREBP-1c、FAS、SCD-1、ACC-1、SREBP-2、HMGCR、PPARγ)的相对表达量,采用蛋白免疫印记技术(Western Blot)分析肝组织蛋白质表达水平,同时对小鼠肠道菌群进行高通量测序(16 S rDNA)并分析其结构。结果显示,LJT干预后小鼠体质量、血糖AUC、血清TG、TC、LDL-C和肝脏中TG、TC水平有显著下降,龙井组小鼠肝组织SREBP-1c、FAS、ACC-1、SCD-1和PPARγ蛋白表达水平降低,SREBP-1c、SCD-1、FAS、ACC-1、SREBP-2、HMGCR、PPARγ基因的相对表达量显著下调;16 S rDNA分析发现,小鼠肠道菌群门水平主要为Firmicutes、Bacteroidota、Desulfobacterota和Actinobacteriota 4类,LJT有效延缓了高脂饮食引起的Firmicutes相对丰度升高和Bacteroidota相对丰度下降趋势,并增加了肠道菌群的物种丰度。结果表明,LJT能够干预小鼠肝脂肪变性SREBPs通路信号表达,改善小鼠肠道菌群紊乱,具有降脂减肥作用。
基金Natural Science Foundation of Hainan Province(No.820RC763)。
文摘Objective:To investigate the relationship between SREBP1 protein expression and clinicopathological features of hepatitis B virus infection-related hepatocellular carcinoma.Methods:A total of 91 cases of hepatocellular carcinoma associated with hepatitis B virus infection and paired adjacent liver tissue samples were collected from the Department of Pathology,the First Affiliated Hospital of Hainan Medical College.The expression of SREBP1 protein in cancer and paired adjacent tissues was detected by immunohistochemical staining.The relationship between SREBP1 protein expression and clinicopathological features of hepatocellular carcinoma was analyzed by chi-square test.Results:The results of immunohistochemical staining showed that the ex-pression of SREBP1 protein in hepatocellular carcinoma was significantly higher than that in adjacent liver tissues(P<0.001).The expression level of SREBP1 protein was significantly correlated with tumor differentiation,distant metastasis or local recurrence in patients with hepatocellular carcinoma(P<0.05).The expression of SREBP1 protein was significantly up-regulated in the high HBV-related HCC virus load group(>103 IU/mL)compared with the low HBV-related HCC virus load group 3(0~10 IU/mL)(P<0.05).Conclusion:1.The expression of SREBP1 protein is correlated with hepatocellular carcinoma,and shows a high expression trend,which provides direction and theoretical basis for the study of lipid metabolism regulation mechnism related to the occurrence and development of hepatocellular carcinoma.2.The expression of SREBP1 protein is correlated with the replication activity of hepatitis B virus,which provides a new research direction for the exploration of the mechanism of the occurrence and development of hepatitis B virus infection-related liver cancer.
文摘目的分析CT联合叉头转录因子O家族1(Forkhead transcription factor 1;FoxO1)、胆固醇调节原件结合蛋白(Sterol-regulatory element binding proteins,SREBPs)表达对原发性肝癌伴乙肝患者的诊断效能。方法回顾性分析2020年1月至2022年7月临床超声检查提示肝脏局灶性病变患者54例为研究对象,手术病理金标准确诊乙肝肝硬化患者29例(乙肝组)、原发性肝癌合并乙肝25例(肝癌合并乙肝组),两组患者术前均行CT联合FoxO1、SREBP2诊断,比较组间FoxO1、SREBP2水平及CT影像征象,同时作ROC曲线分析模型预测价值。结果(1)原发性肝癌伴乙肝组患者门静脉血流灌注量(HPF)、肝动脉血流灌注量(HAF)及肝动脉灌注指数(HPI)水平均显著低于乙肝组患者,组间差异有统计学意义(P<0.05);(2)原发性肝癌伴乙肝组患者FoxO1、SREBP2阳性检出率均显著高于乙肝组,组间统计学意义成立(P<0.05);(3)原发性肝癌伴乙肝患者中,癌旁组织FoxO1阳性率(48.28%)高于肝癌组织(24.14%),肝癌组织SREBP2阳性率(51.72%)高于癌旁组织(24.14%),组间统计学意义成立(P<0.05);(4)ROC曲线结果显示,预测模型最佳临界值为0.090,ROC曲线下面积(area under curve,AUC)为0.614(0.651~0.731)、0.701(0.686~0.801)、0.697(0.651~0.779)、0.899(0.789~0.996)。结论原发性肝癌伴乙肝患者CT相关检查参数呈低水平表达,FoxO1、SREBP2阳性率更高,CT联合FoxO1、SREBP2诊断对原发性肝癌伴乙肝的敏感度更高,可用于预后评估,建议临床推广使用。