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Tissue-specific and reversible RNA interference in transgenic mice

前列腺癌与雄激素受体基因_CAG_n重复多态性的关系

#论著# 前列腺癌与雄激素受体基因(CAG)n 重复多态性的关系王钢陈光椿王晓慧夏冰张金山卢建 =摘要> 目的探讨前列腺癌(PC)与雄激素受体(AR)基因(CAG)n 重复多态性的关系。方法应用DNA 双链循环测序方法对34例PC 组织与癌旁正常组织、2例PC 患者外周血白细胞内的A R 基因(CAG)n 重复数进行测定。结果同一PC 患者的癌组织与癌旁正常组织(CA G)n 重复数相同;36例患者癌组织A R 基因(CAG)n 呈重复多态性,平均20.06,显著低于正常组织,差别有显著性意义(P <0.05);不同分化程度的癌组织(CAG)n 重复数差别无显著性意义(P >0.05)。结论 A R 基因(CAG)n 重复数改变的体细胞突变在PC 癌细胞中罕见,该重复数的减少可能与PC 发病相关。 =关键词> 前列腺肿瘤; 癌; 受体,雄激素; 基因 Study on the polymorphism of (C AG)n repeats within androgen receptor gene in patients with prostate cancer WA N G Gang ,CH EN Guangchun,WA N G X iaohui,et al.Dep ar tment of Pathop hysiology , Second M illitary M edical University ,Shanghai 200433,China =Abstract > Objective T o study t he relationship between polymorphic (CAG)n repeats of androgen r eceptor(A R)gene and occurrence o f prostate cancer (P C). Methods (CA G)n repeats of both malig -nant cells and adjacent nonmalignant cells from 34paraffin -embedded PCs,and that of peripheral blood cells from 2PC patients w ere assessed using dsDN A cycle sequencing. Results T he number of (CAG )n re -peats in malignant cells w as equal to that in adjacent nonmalig nant cells from the same par affin -embedded PC;the mean of (CAG)n r epeats in the 36P C patients was 20.06w hich w as sig nificantly smaller than t hat of normal men (P <0.05),althoug h no significant difference in t he po lymorphic distributio n of (CA G)n was found among various grades of PC (P >0.05). Conclusions Shortening of (CAG )n re -peats w ithin AR gene may be associated with the occurrence of PC. =Key words > Prostate neoplasms; Carcinoma; R eceptor,androg en; G enes 基金项目:国家自然科学基金(39670300) 作者单位:200433上海,第二军医大学病理生理学教研室前列腺癌(PC)为雄激素依赖性肿瘤,雄激素受体(AR)作为介导雄激素生物学效应的关键大分子在PC 的发生、发展过程中有重要地位。AR 由位于 X 染色体q 11-12的单拷贝AR 基因编码,后者含有8 个外显子和7个内含子。其中第一外显子内含有(CAG)n 三核苷酸重复/微卫星序列,该重复序列在人群中呈现出多态性[1] 。近年来研究发现,该多态性重复序列与PC 发病之间存在相关性[2,3] ,但也有不同结论 [4] 。我们在研究了中国正常男性AR 基因(CAG)n 多态性的基础上[5],对该重复多态性与 PC 发病之间的关系进行探讨。材料与方法一、试剂 C -32P -ATP 系北京亚辉医学工程公司产品,DNA 测序试剂盒为美国Epicenter 公司产品。二、标本 34例PC 病理石蜡切片标本及2例PC 患者外周血标本,病理诊断为浸润性腺癌。其中高分化8例,中分化13例,低分化15例。三、方法 1.组织细胞DNA 提取:石蜡切片经HE 染色后在显微镜下划分开癌组织和癌旁正常组织,以此为

雄激素受体与核受体辅助抑制因子的关系

① 雄激素受体与核受体辅助抑制因子的关系廖国庆3,汤恢焕,吕新生 (中南大学湘雅医院外科,长沙410008) [摘要]　目的:探讨雄激素受体(AR )与核受体辅助抑制因子(SMRT )是否能相互作用及其作用部位。方法:重组构建AR ,SMRT 基因或其基因片段的质粒,体外转录,合成35S 标记融合蛋白,采用转染试验及哺乳动物细胞双杂交实验(transient transfection ,mammalian two 2hybrid test ),GST 沉淀试验(GST pull 2down assay ),间接免疫荧光观察 (indirect immunofluorescence staining )的方法,观察AR 与SMRT 的关系。结果:AR 具有内在的转录抑制活性,可与SMRT 直接作用,其作用部位:在AR 分子上位于配体结合区(LBD ),而DNA 结合区能增强这种作用;在SMRT 分子上则位于羧基端核受体作用区(IDs ),在这个区域的L XXXIXXXI/L 功能基团突变后将会影响AR 与SMRT 的结合。结论:AR 通过其LBD 区与SMRT 分子中的ID2相互作用。 [关键词]　受体;　雄激素;　SMRT ;　相互作用 [中图分类号]　Q781 [文献标识码]　A [文章编号]　167227347(2004)022******* Androgen receptor and SMRT L IAO Guo 2qing 3,TAN G Hui 2huan ,L U ?? Xin 2sheng (Depart ment of S urgery ,Xiangya Hospital ,Cent ral South U niversity ,Changsha 410008,Chi na ) Abstract :　Objective To explore the interaction between androgen receptor (AR )and silencing mediator for retinoid and thyroid hormone receptor (SMR T )and their interaction site.Methods We recombined and constructed AR ,SMR T gene and gene fragments ,in vitro translated 35S fusion proteins to investigate the relationship between AR and SMR T using transient transfection ,mammalian two 2hy 2brid test ,GST pull 2down assay ,and indirect immunofluorescence staining.R esults AR possessed an intrinsic transcriptional repression activity and AR interacted directly with SMR T.One interactive sur 2face on AR was mapped to the ligand 2binding domain (LBD ),and the presence of DNA binding domain enhanced this interaction.The binding surface on SMR T was mapped to the carboxyl 2terminal nuclear receptor interacting domain (ID ),and mutation of the L XXXIXXXI/L corepressor motif within this do 2main interferred with the interaction.Conclusion LBD domain on the AR can interact with ID2motif on the SMR T. K ey w ords :　receptor ;　androgen ;　SMR T ;　interaction [J Cent South Univ (Med Sci ),2004,29(2):0157206] AR (androgen receptor )是核受体的成员之一,它不但与男性成熟有关,而且在前列腺癌进展中有重要作用[1]。SMR T (silencing mediator for retinoid and thyroid hormone receptor )是核受体辅助抑制因子,目前大量研究结果表明,SMR T 对许多核受体的活性,如ER ,PR ,等具有抑制作用,对平衡体内激素的消涨具有重要作用[2,3]。但AR 与SMR T 的关系如何,目前研究不多。本研究旨在探讨AR 能否与SMR T 作用及其作用部位。1　材料与方法 1.1　质粒和试剂 AR cDNA ,G al4D BD 与AR 的融合基因片段(G 42AR A/B ,G 42AR DE ,G 42AR )分别由Dr.Chang (R ochester 大学医学中心,R ochester ,NY )和Dr.Lirim Shemshedini (T oled o 大学,T oled o ,Ohio )惠赠。G 4s 2AR ,G 42AR 是由本实验室构建,用全长人类AR cDNA 插入到pCMX 2G al Xho1和Asp718位点之间,PCR 扩增,由此构建1～500,1～660,501～660,501～919,和661～919AR 各片段,并插入到pCMX 2HA 载体中,构建重组新的AR 及AR 片段质粒。人类SMR T e [4] 7 51①收稿日期:2003211220 作者简介:廖国庆(19622),男,湖南衡东人,博士,副教授,主要从事肿瘤外科的基础和临床研究。3通讯作者,E 2mail :liaoguoqing @https://www.wendangku.net/doc/bc19024222.html, 中南大学学报(医学版) J Cent South Univ (Med Sci ) 　2004,29(2)