本研究以湖羊肝脏为材料对肝受体类似物-1(Liver receptor homolog-1,Lrh-1;NR5A2)基因序列进行RT-PCR和RACE测定,并用DNAman、Tmpred、Signal P 3.0、Expasy等生物信息学分析软件和在线工具,对Lrh-1cDNA序列及其蛋白的理化特性、跨膜...本研究以湖羊肝脏为材料对肝受体类似物-1(Liver receptor homolog-1,Lrh-1;NR5A2)基因序列进行RT-PCR和RACE测定,并用DNAman、Tmpred、Signal P 3.0、Expasy等生物信息学分析软件和在线工具,对Lrh-1cDNA序列及其蛋白的理化特性、跨膜结构、信号肽和二级结构进行生物信息学分析,同时采用实时荧光定量PCR方法检测湖羊Lrh-1基因的组织表达谱。结果表明,湖羊Lrh-1基因cDNA序列全长1 488bp,与牛的核酸序列相似度最高,为98%,编码区共编码495个氨基酸,氨基酸序列与牛、人、马、猴、犬、小鼠、褐鼠的氨基酸同源性分别为98%、97%、96%、97%、97%、86%和86%;Lrh-1mRNA在湖羊脑、消化及生殖系统组织中均有表达且具有组织特异性,其中在下丘脑组织中的表达量相对最高。展开更多
Enhancer Ⅱ (ENⅡ) is one of the critical crs-elements in the Hepatitis B Virus (HBV) genome for the hepatic viral gene transcription and DNA replication. The liver-specific activity of ENII is regulated by multiple l...Enhancer Ⅱ (ENⅡ) is one of the critical crs-elements in the Hepatitis B Virus (HBV) genome for the hepatic viral gene transcription and DNA replication. The liver-specific activity of ENII is regulated by multiple liver-enriched transcription factors, including LRH-1/hBlF, HNF1, HNF3β, HNF4 and C/EBP. Knowledge on the interplay of these important factors is still limited. In this study, we demonstrate a functional synergism between the orphan nuclear receptor LRH-1/hBlF and the homeoprotein HNF1 in up-regulating the liver-specific activity of ENII. This synergism is sufficient for initiating the viral gene transcription and DNA replication in non-hepatic cells. We have defined the activation domains in hB1F and HNF1 that contribute to the synergism. We further show that hB1F and HNF1 can interact directly in vitro and have mapped the domains required for this interaction.展开更多
LRH-1(nuclear receptor subfamily 5, group A, member 2),是核受体家族的成员之一,作为转录共激活子调控相关基因的表达,对类固醇激素的分泌及细胞代谢有重要影响。为探究LRH-1对牛卵巢颗粒细胞类固醇激素分泌的影响,以体外培养的牛...LRH-1(nuclear receptor subfamily 5, group A, member 2),是核受体家族的成员之一,作为转录共激活子调控相关基因的表达,对类固醇激素的分泌及细胞代谢有重要影响。为探究LRH-1对牛卵巢颗粒细胞类固醇激素分泌的影响,以体外培养的牛卵巢颗粒细胞为试验材料,使用不同浓度(20μM、50μM、100μM、150μM、200μM)LRH-1的激活剂DLPC激活LRH-1的表达,通过免疫荧光、免疫组织化学和RT-qPCR方法,检测LRH-1在牛卵巢组织中的表达定位及其对牛卵巢颗粒细胞类固醇合成相关基因表达水平的影响。试验结果表明,LRH-1在牛卵巢颗粒细胞中高度表达,50μM DLPC可显著提高STAR、LRH-1、CYP17基因的表达,20μM DLPC可显著抑制CYP11基因的表达。研究结果揭示了LRH-1表达的上调可以显著提高类固醇激素合成相关基因的表达。展开更多
Liver receptor homolog-1(LRH-1)is an orphan nuclear receptor that is critical for the growth and proliferation of cancer cells and other biological processes,including lipid transportation and metabolism,sexual determ...Liver receptor homolog-1(LRH-1)is an orphan nuclear receptor that is critical for the growth and proliferation of cancer cells and other biological processes,including lipid transportation and metabolism,sexual determination and steroidogenesis.However,because homozygous lrh-1mice die in utero,the regulatory mechanisms involved in embryonic development mediated by this receptor are poorly understood.In the present study,we performed transcription activator-like effector nuclease(TALEN)-mediated loss-of-function assays,taking advantage of zebrafish external fertilization,to investigate the function of lrh-1.The digestive organs were affected by lrh-1 depletion as a result of cellcycle arrest(at the checkpoint of G1 to S phase),but not cell apoptosis.Biochemical analysis revealed that LRH-1 augments the transcriptional activity of b-catenin 1 and 2 via physical interactions.Screening the specific ligand(s)sensed by LRH-1 during organogenesis revealed that phosphatidylcholine(PC),a potential ligand,is the upstream target of LRH-1 during endoderm development.These data provide evidence for the crosstalk between the PC/LRH-1 and Wnt/β-catenin signaling pathways during the expansion growth of endoderm organs.展开更多
基金supported by the National Natural Science Foundation of China(30100088)High Technology Research and Development Project(2001-AA221261)+1 种基金Basic Research Program from Ministry of Science and Technology(G1999054105)supported by a Qi Ming Xing program(01QA14046)from Shanghai Science and Technology Committee
文摘Enhancer Ⅱ (ENⅡ) is one of the critical crs-elements in the Hepatitis B Virus (HBV) genome for the hepatic viral gene transcription and DNA replication. The liver-specific activity of ENII is regulated by multiple liver-enriched transcription factors, including LRH-1/hBlF, HNF1, HNF3β, HNF4 and C/EBP. Knowledge on the interplay of these important factors is still limited. In this study, we demonstrate a functional synergism between the orphan nuclear receptor LRH-1/hBlF and the homeoprotein HNF1 in up-regulating the liver-specific activity of ENII. This synergism is sufficient for initiating the viral gene transcription and DNA replication in non-hepatic cells. We have defined the activation domains in hB1F and HNF1 that contribute to the synergism. We further show that hB1F and HNF1 can interact directly in vitro and have mapped the domains required for this interaction.
文摘LRH-1(nuclear receptor subfamily 5, group A, member 2),是核受体家族的成员之一,作为转录共激活子调控相关基因的表达,对类固醇激素的分泌及细胞代谢有重要影响。为探究LRH-1对牛卵巢颗粒细胞类固醇激素分泌的影响,以体外培养的牛卵巢颗粒细胞为试验材料,使用不同浓度(20μM、50μM、100μM、150μM、200μM)LRH-1的激活剂DLPC激活LRH-1的表达,通过免疫荧光、免疫组织化学和RT-qPCR方法,检测LRH-1在牛卵巢组织中的表达定位及其对牛卵巢颗粒细胞类固醇合成相关基因表达水平的影响。试验结果表明,LRH-1在牛卵巢颗粒细胞中高度表达,50μM DLPC可显著提高STAR、LRH-1、CYP17基因的表达,20μM DLPC可显著抑制CYP11基因的表达。研究结果揭示了LRH-1表达的上调可以显著提高类固醇激素合成相关基因的表达。
基金financially supported by the grants from the National Natural Science Foundation of China (No.31530077 to Z.Y. and No.31501857 to G.Z.)the National Basic Research Program of China (973 Program) (No.2014CB138602 to Z.Y.)
文摘Liver receptor homolog-1(LRH-1)is an orphan nuclear receptor that is critical for the growth and proliferation of cancer cells and other biological processes,including lipid transportation and metabolism,sexual determination and steroidogenesis.However,because homozygous lrh-1mice die in utero,the regulatory mechanisms involved in embryonic development mediated by this receptor are poorly understood.In the present study,we performed transcription activator-like effector nuclease(TALEN)-mediated loss-of-function assays,taking advantage of zebrafish external fertilization,to investigate the function of lrh-1.The digestive organs were affected by lrh-1 depletion as a result of cellcycle arrest(at the checkpoint of G1 to S phase),but not cell apoptosis.Biochemical analysis revealed that LRH-1 augments the transcriptional activity of b-catenin 1 and 2 via physical interactions.Screening the specific ligand(s)sensed by LRH-1 during organogenesis revealed that phosphatidylcholine(PC),a potential ligand,is the upstream target of LRH-1 during endoderm development.These data provide evidence for the crosstalk between the PC/LRH-1 and Wnt/β-catenin signaling pathways during the expansion growth of endoderm organs.
