目的探讨孕妇血清胰岛素样生长因子1(insulin like growth factor 1,IGF-1)、IGF-2、IGF结合蛋白3(IGF binding protein 3,IGFBP-3)与正常胎儿生长的关系。方法选择2010年1月至2011年5月于上海市浦东新区人民医院产前检查并分娩正常体...目的探讨孕妇血清胰岛素样生长因子1(insulin like growth factor 1,IGF-1)、IGF-2、IGF结合蛋白3(IGF binding protein 3,IGFBP-3)与正常胎儿生长的关系。方法选择2010年1月至2011年5月于上海市浦东新区人民医院产前检查并分娩正常体重儿的初产妇66例,分为妊娠16～18周、妊娠26～28周、妊娠37～40周3个阶段进行纵向观察,放射免疫法测定孕妇各阶段血清中IGF-1、IGF-2、IGFBP-3水平并进行对比分析。结果孕期母血IGF-1水平随着孕周增加明显上升,其中IGF-1水平在妊娠37～40周高于妊娠26～28周,妊娠26～28周高于妊娠16～18周,差异均有显著统计学意义(P均<0.01)。孕期母血IGF-2水平随孕周增加无明显改变,妊娠3阶段差异无统计学意义(P>0.05)。母血IGFBP-3水平妊娠37～40周高于妊娠26～28周及妊娠16～18周期,差异有统计学意义(P<0.05),而妊娠26～28周与妊娠16～18周无显著差异。妊娠16～18周、26～28周和37～40周3阶段母血IGF-1、IGF-2、IGFBP-3水平与正常新生儿出生体重无显著相关性。结论孕妇血清IGF-1、IGFBP-3水平与正常胎儿生长密切相关,IGF-1可作为临床评价不同阶段正常胎儿生长的指标,而IGFBP-3更多地反映了妊娠中晚期正常胎儿的生长。展开更多
目的:研究人重组骨形成蛋白(recombinant human bone morphogenetic protein,rhBMP),胰岛素样生长因子-1(insulin-like growth factor-1,IGF-I) 单独及联合应用对兔成骨细胞增殖的影响。方法:采用细胞培养技术及噻唑蓝比色法,对2种...目的:研究人重组骨形成蛋白(recombinant human bone morphogenetic protein,rhBMP),胰岛素样生长因子-1(insulin-like growth factor-1,IGF-I) 单独及联合应用对兔成骨细胞增殖的影响。方法:采用细胞培养技术及噻唑蓝比色法,对2种生长因子对兔成骨样细胞增殖的调节作用进行观察。结果:在培养基中含1%胎牛血清(FBS)条件下,100ng/ml rhBMP-2对兔成骨样细胞增殖作用不显著。IGF-I(5,25,50ng/ml)有一定促增殖作用。两者联合应用各浓度组对细胞增殖有促进作用(P<0.05)。结论:rhBMP-2 和IGF-I联合应用对兔成骨样细胞增殖有协同效应。展开更多
The purpose of this study was to determine the relationship between methylation status of the insulin-like growth factor 2 （IGF-2） gene and methylenetetrahydrofolate reductase （MTHFR） C677T gene polymorphisms in b...The purpose of this study was to determine the relationship between methylation status of the insulin-like growth factor 2 （IGF-2） gene and methylenetetrahydrofolate reductase （MTHFR） C677T gene polymorphisms in bladder transitional cell carcinoma tissues in a Chinese population. The polymorphisms of the folate metabolism enzyme gene MTHFR were studied by restrictive fragment length polymorphism （RFLP）, PCR-based methods of DNA methylation analysis were used to detect the CpG island methylation status of the IGF-2 gene. The association between the methylation status of the IGF-2 gene and clinical characteristics, as well as MTHFR C677T polymorphisms, was analyzed. Aberrant hypomethylation of the IGF-2 gene was found in 68.3% bladder cancer tissues and 12.4% normal bladder tissues, respectively, while hypomethylation was not detected in almost all normal bladder tissues. The hypomethylation rate of the IGF-2 gene in cancer tissues was significantly higher in patients with lymph node metastasis than in those without lymph node metastasis （46.3% vs 17.2%, P = 0.018）. No association was found between aberrant DNA methylation and selected factors including sex, age, tobacco smoking, alcohol consumption and green tea consumption. After adjusting for potential confounding variables the variant allele of MTHFR C677T was found to be associated with hypomethylation of the IGF-2 gene. Compared with wildtype CC, the odds ratio was 4.33 （95% CI=1.06-10.59） for CT and 4,95 （95% CI=1.18-12.74） for TT. MTHFR 677 CC and CT genotypes might be one of the reasons that cause abnormal hypomethylation of the IGF-2 gene, and the aberrant CpG island hypomethylation of the IGF-2 gene may contribute to the genesis and progression of bladder transitional cell carcinoma.展开更多
为了揭示脂肪型的藏猪和瘦肉型的杜洛克猪胰岛素样生长因子2(IGF-2)基因的表达差异,采用QRT-PCR方法检测了两猪种背最长肌中IGF-2基因在180日龄的表达差异,并分析其与肌纤维面积、肌内脂肪(IMF)含量的相关性。结果表明,180日龄藏猪IGF-2...为了揭示脂肪型的藏猪和瘦肉型的杜洛克猪胰岛素样生长因子2(IGF-2)基因的表达差异,采用QRT-PCR方法检测了两猪种背最长肌中IGF-2基因在180日龄的表达差异,并分析其与肌纤维面积、肌内脂肪(IMF)含量的相关性。结果表明,180日龄藏猪IGF-2 m RNA表达量显著低于杜洛克猪(P<0.05)。相关性分析结果显示,IGF-2 m RNA表达量与肌纤维面积呈显著正相关(P<0.05),与IMF含量呈显著负相关(P<0.05)。以上结果初步揭示了两猪种在180日龄IGF-2基因表达的品种差异,为深入研究肌纤维生长及IMF沉积的调控机制提供了基础数据。展开更多
文摘目的探讨孕妇血清胰岛素样生长因子1(insulin like growth factor 1,IGF-1)、IGF-2、IGF结合蛋白3(IGF binding protein 3,IGFBP-3)与正常胎儿生长的关系。方法选择2010年1月至2011年5月于上海市浦东新区人民医院产前检查并分娩正常体重儿的初产妇66例,分为妊娠16～18周、妊娠26～28周、妊娠37～40周3个阶段进行纵向观察,放射免疫法测定孕妇各阶段血清中IGF-1、IGF-2、IGFBP-3水平并进行对比分析。结果孕期母血IGF-1水平随着孕周增加明显上升,其中IGF-1水平在妊娠37～40周高于妊娠26～28周,妊娠26～28周高于妊娠16～18周,差异均有显著统计学意义(P均<0.01)。孕期母血IGF-2水平随孕周增加无明显改变,妊娠3阶段差异无统计学意义(P>0.05)。母血IGFBP-3水平妊娠37～40周高于妊娠26～28周及妊娠16～18周期,差异有统计学意义(P<0.05),而妊娠26～28周与妊娠16～18周无显著差异。妊娠16～18周、26～28周和37～40周3阶段母血IGF-1、IGF-2、IGFBP-3水平与正常新生儿出生体重无显著相关性。结论孕妇血清IGF-1、IGFBP-3水平与正常胎儿生长密切相关,IGF-1可作为临床评价不同阶段正常胎儿生长的指标,而IGFBP-3更多地反映了妊娠中晚期正常胎儿的生长。
文摘目的:探讨胃癌组织中,IGF-2(insulin-like growth factors2)基因的印迹状态及其与各临床病理因素间的关系。方法:应用PCR、RT-PCR及限制性内切酶(ApaⅠ)酶切等方法,检测33例胃癌组织中IGF-2基因的印迹状态,分析IGF-2基因印迹丧失(loss of imprinting,LOI)及其与胃癌各临床病理因素之间的关系。结果:胃癌组织中,IGF-2基因印迹的丧失率为48.5%(16/33),癌近旁黏膜的IGF-2基因印迹丧失率为21%(7/33),癌远旁黏膜的丧失率为12.1%(4/33)。同时,在有淋巴结转移的胃癌病例中IGF-2基因印迹丧失率(60.9%)明显高于无淋巴结转移者(20.0%);TNM分期Ⅲ、Ⅳ期的胃癌IGF-2基因印迹丧失率(60.0%)明显高于Ⅰ、Ⅱ期者(12.5%)(P均<0.05)。结论:IGF-2基因印迹丧失是贯穿于胃癌发生、发展全过程的表观遗传异常,其与胃癌的临床、病理分期及病人预后相关。
文摘目的:研究人重组骨形成蛋白(recombinant human bone morphogenetic protein,rhBMP),胰岛素样生长因子-1(insulin-like growth factor-1,IGF-I) 单独及联合应用对兔成骨细胞增殖的影响。方法:采用细胞培养技术及噻唑蓝比色法,对2种生长因子对兔成骨样细胞增殖的调节作用进行观察。结果:在培养基中含1%胎牛血清(FBS)条件下,100ng/ml rhBMP-2对兔成骨样细胞增殖作用不显著。IGF-I(5,25,50ng/ml)有一定促增殖作用。两者联合应用各浓度组对细胞增殖有促进作用(P<0.05)。结论:rhBMP-2 和IGF-I联合应用对兔成骨样细胞增殖有协同效应。
文摘The purpose of this study was to determine the relationship between methylation status of the insulin-like growth factor 2 （IGF-2） gene and methylenetetrahydrofolate reductase （MTHFR） C677T gene polymorphisms in bladder transitional cell carcinoma tissues in a Chinese population. The polymorphisms of the folate metabolism enzyme gene MTHFR were studied by restrictive fragment length polymorphism （RFLP）, PCR-based methods of DNA methylation analysis were used to detect the CpG island methylation status of the IGF-2 gene. The association between the methylation status of the IGF-2 gene and clinical characteristics, as well as MTHFR C677T polymorphisms, was analyzed. Aberrant hypomethylation of the IGF-2 gene was found in 68.3% bladder cancer tissues and 12.4% normal bladder tissues, respectively, while hypomethylation was not detected in almost all normal bladder tissues. The hypomethylation rate of the IGF-2 gene in cancer tissues was significantly higher in patients with lymph node metastasis than in those without lymph node metastasis （46.3% vs 17.2%, P = 0.018）. No association was found between aberrant DNA methylation and selected factors including sex, age, tobacco smoking, alcohol consumption and green tea consumption. After adjusting for potential confounding variables the variant allele of MTHFR C677T was found to be associated with hypomethylation of the IGF-2 gene. Compared with wildtype CC, the odds ratio was 4.33 （95% CI=1.06-10.59） for CT and 4,95 （95% CI=1.18-12.74） for TT. MTHFR 677 CC and CT genotypes might be one of the reasons that cause abnormal hypomethylation of the IGF-2 gene, and the aberrant CpG island hypomethylation of the IGF-2 gene may contribute to the genesis and progression of bladder transitional cell carcinoma.
文摘为了揭示脂肪型的藏猪和瘦肉型的杜洛克猪胰岛素样生长因子2(IGF-2)基因的表达差异,采用QRT-PCR方法检测了两猪种背最长肌中IGF-2基因在180日龄的表达差异,并分析其与肌纤维面积、肌内脂肪(IMF)含量的相关性。结果表明,180日龄藏猪IGF-2 m RNA表达量显著低于杜洛克猪(P<0.05)。相关性分析结果显示,IGF-2 m RNA表达量与肌纤维面积呈显著正相关(P<0.05),与IMF含量呈显著负相关(P<0.05)。以上结果初步揭示了两猪种在180日龄IGF-2基因表达的品种差异,为深入研究肌纤维生长及IMF沉积的调控机制提供了基础数据。
