人内皮抑素基因克隆及在大肠杆菌中的表达

目的：获得具有抑制血管内皮细胞生长活性的重组人内皮抑制素蛋白。方法：从人胎肝中分离总RNA,经反转录聚合酶链反应（RT－PCR）得到endostatin全基因。用原核细胞表达载体构建pBV220/endostatin重组质粒,经DNA测序确认后,将其转化大肠杆菌DH5a进行表达,初步纯化及活性测定。结果：经SDS－PAGE电泳分析表达产物分子量约20Kda,薄层扫描显示表达产物可达细菌总蛋白的30％。结论：经生物学活性测定,表达蛋白能够抑制bFGF(碱性成纤维细胞生长因子）对牛毛细血管内皮细胞（BCEC）的增殖作用。     

内皮抑素对小鼠Lewis肺癌移植瘤抑瘤作用的分子影像研究

目的　利用绿色荧光蛋白 (greenfluorescentprotein ,GFP)标记的小鼠Lewis肺癌 (LLC)移植瘤模型 ,观察内皮抑素对LLC的作用。方法　将GFP标记的小鼠LLC细胞种植于 15只C5 7小鼠体内 ,分为空白对照组、尾静脉注射内皮抑素组、局部注射内皮抑素组。采用活体荧光成像 ,测定抑瘤率、微血管密度及测定VEGF和Bcl 2水平的方法评价治疗效果。结果　试验组抑瘤率分别为2 1 6 %和 2 7 7% ,较对照组增高 (P <0 0 5 )。尾静脉注射组MVD为 (13 77± 4 4 1)个 /高倍镜视野 ,局部注射组MVD为 (14 13± 4 0 5 )个 /高倍镜视野 ,明显低于空白对照组 (2 7 76± 8 87)个 /高倍镜视野 (P <0 0 1)。微血管计数 (MVD)密度降低 (P <0 0 5 ) ,试验组VEGF和Bcl 2强阳性较对照组少(P <0 0 1)。结论　GFP标记的小鼠LLC模型荧光显像清晰稳定。可在活体观察肿瘤细微的变化过程 ;内皮抑素对小鼠Lewis肺癌移植瘤有明显的抑制作用。     

放射线联合p53基因及内皮抑素治疗小鼠前列腺癌皮下移植瘤

目的 观察放射线联合p53基因及内皮抑素治疗C57BL/6小鼠前列腺癌皮下移植瘤的效果,并初步探讨其作用机制。方法 建立C57BL/6小鼠前列腺癌皮下移植瘤模型。随机分成5组:空白组(A)、放射组(B)、放射线联合p53基因组(C)、放射线联合内皮抑素组(D)及放射线联合p53基因和内皮抑素组(E)。第1天C、E组瘤内注射p53基因腺病毒(1×1vp),第1~14天D、E组每日1次腹腔注射内皮抑素(1.5mg/kg)。第4天B、C、D、E组小鼠肿瘤区单次照射(6 MV X线D_T 15Gy)。每日测量肿瘤体积;检测各组肿瘤标本P53、Ki67及血管内皮生长因子(VEGF)的表达及微血管密度值(MVD)。结果 4个治疗组的肿瘤生长速度均低于空白组(P=0.000),其中E组生长最慢(P<0.05)。免疫组织化学结果:4个治疗组P53的表达均明显低于空白组(P=0.000);4个治疗组Ki67的表达均高于空白组,但变化趋势不同:B、C组Ki67的表达值接近,均随时间的推移而逐渐升高(P=0.000),D、E组的表达则呈现波动性;第5天时E组VEGF的表达最低(P<0.05);肿瘤生长过程中各组MVD值均持续升高,C、D、E 3组MVD值在各时间均高于空白组(P<0.05)。结论 放射线联合p53基因及内皮抑素的抑瘤效果优于单独放射治疗及放射线联合p53基因或内皮抑素。三者均有自己的作用机制,但相互之间可以互相影响。     

放射线联合p53基因及内皮抑素治疗小鼠前列腺癌皮下移植瘤

Objective To test the hypothesis that p53 gene therapy combined with endostatin can enhance tumor response to radiation therapy of RM-1 mouse xenograft prostate cancer and to investigate its mechanism. Methods A mouse prostate cancer model was established. Then mice with xenograft tumor were randomly divided into group A (control), B (radiation), C (radiation and rAdp53), D (radiation and rh-endostatin) and E (radiation and rAdp53 and rh-endostatin). On day 1, rAdp53 was injected intra-tumorously with 1 × 1010 vp per animal to group C and E. From day 1 to 14, rh-endostatin was given 15 mg/kg intraperitoneally daily to group D and E. On day 4 single fraction of 15 Gy was given to tumors in groups B, C, D and E. Normal saline was injected intra-tumorously or intraperitoneaUy accordingly as control. No treatment was done to group A. Tumor volume was measured daily. Samples were collected on Days 5, 10 and 15. Ki67, CD31, p53 and VEGF were detected by means of immunohistochemistry. Results (1) Radiation alone, radiation combined with intra-tumorous injection of Adp53 and/or intraperitoneal injection of rh-endostatin resulted in tumor growth arrest of RM-1 cells in vivo (P = 0.000). Radiation combined with both rAdp53 and rh-endostatin was the most effective treatment (P < 0.05). (2) All the four treatment groups had a decreased expression of mutant type P53 (P = 0.000). The expression of Ki67 in groups B and C were equal (P 0.05) and increasing (P = 0.000), respectively. Group D had a up-down-up curve (P < 0.05), but group E had a up-down one. On day 5 the expresion of VEGF in group E was the lowest (P < 0.05). An increased expression of MVD compared with the control was shown, and MVD in groups C, D and E were always higher than that in the control (P < 0.05). Conclusions The limitation of radiotherapy could be overcome by combination with beth p53 gene therapy and endostatin on the growth of mouse prostate cancer cell. Radiation, rAdp53 and endostatin have their own role but they can be interacted with each other.     

放射线联合p53基因及内皮抑素治疗小鼠前列腺癌皮下移植瘤

Objective To test the hypothesis that p53 gene therapy combined with endostatin can enhance tumor response to radiation therapy of RM-1 mouse xenograft prostate cancer and to investigate its mechanism. Methods A mouse prostate cancer model was established. Then mice with xenograft tumor were randomly divided into group A (control), B (radiation), C (radiation and rAdp53), D (radiation and rh-endostatin) and E (radiation and rAdp53 and rh-endostatin). On day 1, rAdp53 was injected intra-tumorously with 1 × 1010 vp per animal to group C and E. From day 1 to 14, rh-endostatin was given 15 mg/kg intraperitoneally daily to group D and E. On day 4 single fraction of 15 Gy was given to tumors in groups B, C, D and E. Normal saline was injected intra-tumorously or intraperitoneaUy accordingly as control. No treatment was done to group A. Tumor volume was measured daily. Samples were collected on Days 5, 10 and 15. Ki67, CD31, p53 and VEGF were detected by means of immunohistochemistry. Results (1) Radiation alone, radiation combined with intra-tumorous injection of Adp53 and/or intraperitoneal injection of rh-endostatin resulted in tumor growth arrest of RM-1 cells in vivo (P = 0.000). Radiation combined with both rAdp53 and rh-endostatin was the most effective treatment (P < 0.05). (2) All the four treatment groups had a decreased expression of mutant type P53 (P = 0.000). The expression of Ki67 in groups B and C were equal (P 0.05) and increasing (P = 0.000), respectively. Group D had a up-down-up curve (P < 0.05), but group E had a up-down one. On day 5 the expresion of VEGF in group E was the lowest (P < 0.05). An increased expression of MVD compared with the control was shown, and MVD in groups C, D and E were always higher than that in the control (P < 0.05). Conclusions The limitation of radiotherapy could be overcome by combination with beth p53 gene therapy and endostatin on the growth of mouse prostate cancer cell. Radiation, rAdp53 and endostatin have their own role but they can be interacted with each other.     

放射线联合p53基因及内皮抑素治疗小鼠前列腺癌皮下移植瘤

Objective To test the hypothesis that p53 gene therapy combined with endostatin can enhance tumor response to radiation therapy of RM-1 mouse xenograft prostate cancer and to investigate its mechanism. Methods A mouse prostate cancer model was established. Then mice with xenograft tumor were randomly divided into group A (control), B (radiation), C (radiation and rAdp53), D (radiation and rh-endostatin) and E (radiation and rAdp53 and rh-endostatin). On day 1, rAdp53 was injected intra-tumorously with 1 × 1010 vp per animal to group C and E. From day 1 to 14, rh-endostatin was given 15 mg/kg intraperitoneally daily to group D and E. On day 4 single fraction of 15 Gy was given to tumors in groups B, C, D and E. Normal saline was injected intra-tumorously or intraperitoneaUy accordingly as control. No treatment was done to group A. Tumor volume was measured daily. Samples were collected on Days 5, 10 and 15. Ki67, CD31, p53 and VEGF were detected by means of immunohistochemistry. Results (1) Radiation alone, radiation combined with intra-tumorous injection of Adp53 and/or intraperitoneal injection of rh-endostatin resulted in tumor growth arrest of RM-1 cells in vivo (P = 0.000). Radiation combined with both rAdp53 and rh-endostatin was the most effective treatment (P < 0.05). (2) All the four treatment groups had a decreased expression of mutant type P53 (P = 0.000). The expression of Ki67 in groups B and C were equal (P 0.05) and increasing (P = 0.000), respectively. Group D had a up-down-up curve (P < 0.05), but group E had a up-down one. On day 5 the expresion of VEGF in group E was the lowest (P < 0.05). An increased expression of MVD compared with the control was shown, and MVD in groups C, D and E were always higher than that in the control (P < 0.05). Conclusions The limitation of radiotherapy could be overcome by combination with beth p53 gene therapy and endostatin on the growth of mouse prostate cancer cell. Radiation, rAdp53 and endostatin have their own role but they can be interacted with each other.     

放射线联合p53基因及内皮抑素治疗小鼠前列腺癌皮下移植瘤

Objective To test the hypothesis that p53 gene therapy combined with endostatin can enhance tumor response to radiation therapy of RM-1 mouse xenograft prostate cancer and to investigate its mechanism. Methods A mouse prostate cancer model was established. Then mice with xenograft tumor were randomly divided into group A (control), B (radiation), C (radiation and rAdp53), D (radiation and rh-endostatin) and E (radiation and rAdp53 and rh-endostatin). On day 1, rAdp53 was injected intra-tumorously with 1 × 1010 vp per animal to group C and E. From day 1 to 14, rh-endostatin was given 15 mg/kg intraperitoneally daily to group D and E. On day 4 single fraction of 15 Gy was given to tumors in groups B, C, D and E. Normal saline was injected intra-tumorously or intraperitoneaUy accordingly as control. No treatment was done to group A. Tumor volume was measured daily. Samples were collected on Days 5, 10 and 15. Ki67, CD31, p53 and VEGF were detected by means of immunohistochemistry. Results (1) Radiation alone, radiation combined with intra-tumorous injection of Adp53 and/or intraperitoneal injection of rh-endostatin resulted in tumor growth arrest of RM-1 cells in vivo (P = 0.000). Radiation combined with both rAdp53 and rh-endostatin was the most effective treatment (P < 0.05). (2) All the four treatment groups had a decreased expression of mutant type P53 (P = 0.000). The expression of Ki67 in groups B and C were equal (P 0.05) and increasing (P = 0.000), respectively. Group D had a up-down-up curve (P < 0.05), but group E had a up-down one. On day 5 the expresion of VEGF in group E was the lowest (P < 0.05). An increased expression of MVD compared with the control was shown, and MVD in groups C, D and E were always higher than that in the control (P < 0.05). Conclusions The limitation of radiotherapy could be overcome by combination with beth p53 gene therapy and endostatin on the growth of mouse prostate cancer cell. Radiation, rAdp53 and endostatin have their own role but they can be interacted with each other.     

放射线联合p53基因及内皮抑素治疗小鼠前列腺癌皮下移植瘤

Objective To test the hypothesis that p53 gene therapy combined with endostatin can enhance tumor response to radiation therapy of RM-1 mouse xenograft prostate cancer and to investigate its mechanism. Methods A mouse prostate cancer model was established. Then mice with xenograft tumor were randomly divided into group A (control), B (radiation), C (radiation and rAdp53), D (radiation and rh-endostatin) and E (radiation and rAdp53 and rh-endostatin). On day 1, rAdp53 was injected intra-tumorously with 1 × 1010 vp per animal to group C and E. From day 1 to 14, rh-endostatin was given 15 mg/kg intraperitoneally daily to group D and E. On day 4 single fraction of 15 Gy was given to tumors in groups B, C, D and E. Normal saline was injected intra-tumorously or intraperitoneaUy accordingly as control. No treatment was done to group A. Tumor volume was measured daily. Samples were collected on Days 5, 10 and 15. Ki67, CD31, p53 and VEGF were detected by means of immunohistochemistry. Results (1) Radiation alone, radiation combined with intra-tumorous injection of Adp53 and/or intraperitoneal injection of rh-endostatin resulted in tumor growth arrest of RM-1 cells in vivo (P = 0.000). Radiation combined with both rAdp53 and rh-endostatin was the most effective treatment (P < 0.05). (2) All the four treatment groups had a decreased expression of mutant type P53 (P = 0.000). The expression of Ki67 in groups B and C were equal (P 0.05) and increasing (P = 0.000), respectively. Group D had a up-down-up curve (P < 0.05), but group E had a up-down one. On day 5 the expresion of VEGF in group E was the lowest (P < 0.05). An increased expression of MVD compared with the control was shown, and MVD in groups C, D and E were always higher than that in the control (P < 0.05). Conclusions The limitation of radiotherapy could be overcome by combination with beth p53 gene therapy and endostatin on the growth of mouse prostate cancer cell. Radiation, rAdp53 and endostatin have their own role but they can be interacted with each other.     

放射线联合p53基因及内皮抑素治疗小鼠前列腺癌皮下移植瘤

Objective To test the hypothesis that p53 gene therapy combined with endostatin can enhance tumor response to radiation therapy of RM-1 mouse xenograft prostate cancer and to investigate its mechanism. Methods A mouse prostate cancer model was established. Then mice with xenograft tumor were randomly divided into group A (control), B (radiation), C (radiation and rAdp53), D (radiation and rh-endostatin) and E (radiation and rAdp53 and rh-endostatin). On day 1, rAdp53 was injected intra-tumorously with 1 × 1010 vp per animal to group C and E. From day 1 to 14, rh-endostatin was given 15 mg/kg intraperitoneally daily to group D and E. On day 4 single fraction of 15 Gy was given to tumors in groups B, C, D and E. Normal saline was injected intra-tumorously or intraperitoneaUy accordingly as control. No treatment was done to group A. Tumor volume was measured daily. Samples were collected on Days 5, 10 and 15. Ki67, CD31, p53 and VEGF were detected by means of immunohistochemistry. Results (1) Radiation alone, radiation combined with intra-tumorous injection of Adp53 and/or intraperitoneal injection of rh-endostatin resulted in tumor growth arrest of RM-1 cells in vivo (P = 0.000). Radiation combined with both rAdp53 and rh-endostatin was the most effective treatment (P < 0.05). (2) All the four treatment groups had a decreased expression of mutant type P53 (P = 0.000). The expression of Ki67 in groups B and C were equal (P 0.05) and increasing (P = 0.000), respectively. Group D had a up-down-up curve (P < 0.05), but group E had a up-down one. On day 5 the expresion of VEGF in group E was the lowest (P < 0.05). An increased expression of MVD compared with the control was shown, and MVD in groups C, D and E were always higher than that in the control (P < 0.05). Conclusions The limitation of radiotherapy could be overcome by combination with beth p53 gene therapy and endostatin on the growth of mouse prostate cancer cell. Radiation, rAdp53 and endostatin have their own role but they can be interacted with each other.     

放射线联合p53基因及内皮抑素治疗小鼠前列腺癌皮下移植瘤

Objective To test the hypothesis that p53 gene therapy combined with endostatin can enhance tumor response to radiation therapy of RM-1 mouse xenograft prostate cancer and to investigate its mechanism. Methods A mouse prostate cancer model was established. Then mice with xenograft tumor were randomly divided into group A (control), B (radiation), C (radiation and rAdp53), D (radiation and rh-endostatin) and E (radiation and rAdp53 and rh-endostatin). On day 1, rAdp53 was injected intra-tumorously with 1 × 1010 vp per animal to group C and E. From day 1 to 14, rh-endostatin was given 15 mg/kg intraperitoneally daily to group D and E. On day 4 single fraction of 15 Gy was given to tumors in groups B, C, D and E. Normal saline was injected intra-tumorously or intraperitoneaUy accordingly as control. No treatment was done to group A. Tumor volume was measured daily. Samples were collected on Days 5, 10 and 15. Ki67, CD31, p53 and VEGF were detected by means of immunohistochemistry. Results (1) Radiation alone, radiation combined with intra-tumorous injection of Adp53 and/or intraperitoneal injection of rh-endostatin resulted in tumor growth arrest of RM-1 cells in vivo (P = 0.000). Radiation combined with both rAdp53 and rh-endostatin was the most effective treatment (P < 0.05). (2) All the four treatment groups had a decreased expression of mutant type P53 (P = 0.000). The expression of Ki67 in groups B and C were equal (P 0.05) and increasing (P = 0.000), respectively. Group D had a up-down-up curve (P < 0.05), but group E had a up-down one. On day 5 the expresion of VEGF in group E was the lowest (P < 0.05). An increased expression of MVD compared with the control was shown, and MVD in groups C, D and E were always higher than that in the control (P < 0.05). Conclusions The limitation of radiotherapy could be overcome by combination with beth p53 gene therapy and endostatin on the growth of mouse prostate cancer cell. Radiation, rAdp53 and endostatin have their own role but they can be interacted with each other.     

人血管生成素-1基因的克隆及原核、真核表达载体的构建

血管生成素（angiopoietin）是近年来发现的与血管生成、抑制密切相关的分子。为研究其在肿瘤血管生成及转移中的作用，利用PCR技术从人胎盘组织中得到血管生成素-1基因，并亚克隆至pRSET C原核表达载体及pcDNA3.1-V5-HisC真核表达载体，成功地构建了原核及正反义真核表达载体，为下一步研究其对消化道肿瘤血管生成的影响打下了基础。     

丙型肝炎病毒NS5B基因的克隆及在大肠杆菌的分泌表达

由于全长丙型肝炎病毒NS5B的疏水性，其表达和纯化非常困难。为了分泌表达NS5B，作者对NS5B进行截短，缺失其疏水部分从而在大肠杆菌细胞中分泌表达HCV NS5B基因，并测定其活性。用逆转录多聚酶链反应（RT－PCR）的方法，设计截去NS5B疏水部分，PCR引物以HCV全长质粒pBRTM/HCV-1为模板，克隆到pGEM-Teasy载体中，双酶切后回收连接到pET-21b中表达。大肠杆菌培养上清过柱纯化，进行十二烷基磺酸钠－聚丙烯酰胺凝胶电泳（SDS－PAGE）和Western免疫印迹显示NS5B蛋白在大肠杆菌细胞中表达。表达产物在大肠杆菌培养上清中存在，分子量68kD左右，而且[^3H]总掺入率达6900cpm。NS5B蛋白在大肠杆菌上清中表达成功，经过活性测定，所表达的NS5B具有活性功能。     

乙型肝炎病毒前S1基因酵母表达载体的构建及表达

为探讨乙型肝炎病毒（HBV）前S1蛋白的功能，在真核生物酵母细胞中表达HBV前S1基因。以HBV ayw亚型全长质粒pCP10为模板，多聚酶链反应（PCR）扩增HBV前S1基因，克隆到pGEM-Tfawsk ,双酶切后回收与酵母表达质粒pGBKT7连接，将重组载体转化酶母细胞AH109，提取酵母蛋白质，进行十二烷基磺酸钠－聚丙烯酰胺凝胶电泳（SDS－PAGE）和Western免疫印迹分析，结果成功地构建了HBV前S1基因酵母表达载体，Western免疫印迹显示HBV前S1在酵母细胞中表达，表达产物在胞内存在，分子量30kD左右。表明HBV前S1蛋白在酵母细胞中表达成功。     

胰腺癌K—ras基因的研究

采用PCR技术,以福尔马林固定、石腊包埋切片中所含DNA为模板,成功地对19例胰腺导管癌中的18例进行了K-ras基因的扩增。应用特异核酸探针和Southern杂交,检测了扩增后K-ras基因并发现15例(83.3％)胰腺导管癌含有K-ras基因点突变。其中12密码由GGT转换为GAT5例(33.3％),12密码由GGT转换为GTT6例(40.0％),13密码由GGC,转换为GAC4例(26.6％)。未证实K-ras基因突变与癌分化程度、转移和浸润率以及患者予后的关系。结果提示K-ras基因突变在胰腺导管癌中极为常见,可能在胰腺癌发生中起重要作用;检测此基因突变可作为胰腺导管癌早期诊断和发生监测的生物学指标。     

DMBT1基因在结肠癌组织内的表达及其临床意义

为探讨DMBT1基因表达与结肠癌转移的关系 ,应用RT PCR的方法检测结肠癌组织及其相应癌旁正常组织内DMBT1基因的表达。结果显示 ,结肠癌组织内及其相应癌旁正常组织内DMBT1基因的表达率分别为 36 1% (13/ 36 ) ,91 7% (33/ 36 ) ;伴有淋巴结转移的癌组织DMBT1表达率 (13 0 % )均低于不伴淋巴结转移的组织 (76 9% ) (P <0 0 5 ) ;肿瘤浸润至深肌层以下DMBT1表达率降低 (P <0 0 5 ) ;Dukes分期A +B期表达率为 73 3% (11/ 15 ) ,C +D为 9 5 % (2 / 2 1) ,两者有显著差异 (P <0 0 1)。实验表明 ,DMBT1基因表达率降低与结肠癌转移存在相关性 ,提示该基因在抑制肿瘤转移中发挥重要作用     

生存素(Survivin)的克隆表达及生物医学意义初步探讨

目的 :克隆、表达肿瘤特异性凋亡抑制因子 (生存素 ,Survivin) ,并对其生物学意义进行研究。方法 :从人白血病细胞系HL60提取总RNA ,用RT PCR方法扩增出SVV基因片段。将SVV基因片段插入载体pGEM TEasy中 ,经全自动序列分析仪测序正确后用NdeⅠ /XhoⅠ双酶切 ,亚克隆到原核表达载体 pRSET C中 ,构建重组表达载体 pRSET c SVV ,并转化大肠杆菌BL2 1菌株。取工程菌 ,经IPTG诱导表达 ,对表达产物进行SDS PAGE鉴定并初步纯化。结果 :经RT PCR测序和酶切鉴定 ,成功地克隆了人SVV基因 ;经IPTG诱导的重组质粒pRSET c SVV表达出相对分子质量约为 165 0 0U的蛋白 ,与预期的结果相符。结论 :成功克隆了人肿瘤细胞的抗凋亡基因SVV ,并在大肠杆菌BL2 1中表达出SVV蛋白。该基因的高效表达为进一步探讨以SVV为基础的肿瘤诊、治奠定了实验基础。     

TGF-β1成熟肽基因克隆及在大肠杆菌中表达

为在原核中表达TGF－β1单体蛋白，用基因重组技术构建pBV220-TGF-β和pQE-TGF－β两种原核表达载体，分别在M15和DH5α大肠杆菌中进行表达，然后利用Sephacryl S-100凝胶层析及Ni^ -NTA琼脂柱纯化TGF－β1单体，经酶切鉴定及测序结果证明pBV220和pQE30载体上成功地插入了TGF－β1成熟肽基因片段，pBV220-TGF－β和pQE-TGF－β两种原核载体在大肠杆菌中均得到了高效表达，表达量约占全菌蛋白的15％和20％，表达的TGF－β1单体蛋白经纯化后进行SDS－PAGE电泳，均显示了一条蛋白带，分子量分别为13kD和15kD左右。     

人类内皮活化相关新基因EOLA1的发现及初步研究

为克隆一个在人脐静脉内皮细胞受脂多糖刺激后表达新序列标签ST5 5 (GenBank接受号BI12 16 4 6 )对应基因全长cDNA序列 ,作者在已知ST5 5序列基础上 ,采用快速扩增cDNA末端(RACE)技术延伸ST5 5的 3′和 5′末端以获取其全长cDNA序列 ,并经Northern印迹杂交验证 ,再对序列进行生物信息学分析 ,获得一个新的人类基因 ,命名为内皮细胞高表达脂多糖相关因子 1(EOLA1) (GenBank接受号AY0 74 889) ,该基因定位于人染色体Xq2 7.3,推导编码蛋白EOLA1包含 15 8个氨基酸 ,预测EOLA1是与内皮细胞活化相关的新基因 ,可能在细胞内信号转导中发挥作用     

纤溶酶原激活抑制因子1基因在人脑星形细胞瘤中的表达及意义

采用Ｎｏｒｔｈｅｒｎ ｂｌｏｔ分子杂交和ＡＢＣ免疫组化方法检测３６例人脑星形细胞瘤纤溶酶原激活抑制因１基因ｍＲＮＡ和蛋白表达，所有星形细胞瘤组织均可表达３．０ｋｂ和２．２ｋｂ的ＰＡＩ－１ ｍＲＮＡ转录物，高级别星形细胞瘤ＰＡＩ－１ ｍＲＮＡ表达水平显著高于低级别星形细胞瘤，ＰＡＩ－１display status     

人白介素2受体基因的cDNA在大肠杆菌中的克隆与表达

利用PCR技术扩增白介素2受体(IL2R)a亚单位的编码序列,同高效表达载体pMYvrf重组,经过复杂的基因操作,获得了5株人IL2Ra亚单位的重组克隆菌株。其中pMYIL2R_(104)表达水平达菌体总蛋白的41%。经免疫印迹分析证明具有特异性IL2R的抗原性,其与配基结合刺激T细胞增殖等生物活性正在研究之中。表达产物有可能用于IL2纯化,制备IL2R的单抗,免疫抑制效应及ATL治疗等研究。