To investigate the relationship between the expression of RASSF1A protein and promoter hypermethylation of RASSF1A gene, RASSF1A protein expression was measured by Western blotting in 10 specimens of normal bladder ti...To investigate the relationship between the expression of RASSF1A protein and promoter hypermethylation of RASSF1A gene, RASSF1A protein expression was measured by Western blotting in 10 specimens of normal bladder tissues and 23 specimens of bladder transitional cell carcinoma （BTCC）. The promoter methylation in BTCC and normal bladder tissues was detected by methylation-specific PCR （MSP）. The results showed that the expression level of RASSF1A protein was significantly lower in BTCC tissues than that in normal bladder tissues. However, it was not correlated with its clinical stages and pathological grades. The frequency of promoter methylation of RASSF1A gene was higher in BTCC tissues than that in normal bladder tissues. In 14 patients with the aberrant promoter methylation, 13 showed loss or low expression of RASSF 1A protein. It is concluded that RASSF1A gene promoter methylation may contribute to the low level or loss of RASSF1A protein expression, the inactivation of RASSF1A gene and the genesis of BTCC. But, it may bear no correlation with its clinical stages and pathological grades.展开更多
Objective： To explore the relationship between microsatellite alterations of RASSFIA gene and the development of cervical carcinoma, and its relationship with HPV16 infection. Methods： Two sites of microsatellite po...Objective： To explore the relationship between microsatellite alterations of RASSFIA gene and the development of cervical carcinoma, and its relationship with HPV16 infection. Methods： Two sites of microsatellite polymorphism of RASSFIA gene were selected. Polymerase chain reaction （PCR） technique was used to detect LOH and MSI in 50 cases of cervical carcinoma and 40 cases of cervical intraepithelial neoplasia （CIN）, and to detect the infection state of HPV16. Results： At D3S1478 and D3S4604, the LOH rates of cervical carcinomas were 32.6% （14/43） and 48.9% （23/47）, the MSI rates were 14% （6/43） and 19.1% （9/47）, respectively. The LOH rates of CINs were 31.4% （11/35） and 39.5% （15/38）, the MSI rates were 11.4% （4/35） and 15.8% （6/38）, respectively. There were no significant differences between cervical carcinomas and CINs in respect to their positive rates of LOH and MSI at D3S1478 and D3S4604 （P〉0.05）. There were significant differences in LOH rates at D3S1478 and D3S4604 between the stage Ⅰ-Ⅱ and Ⅲ-Ⅳ cervical carcinomas and between the well/moderately differentiated cervical carcinomas and the poorly differentiated cervical carcinomas （P〈0.05）. The positive rates of LOH and MSI for CIN Ⅲ and noninvasive cervical carcinomas were higher than those in CIN Ⅰ-Ⅱ. The rates of infection of HPV16 in cervical cancer was obviously higher than that in CIN and in normal cervical tissues （P〈0.05）, and the incidence of LOH of RASSFIA gene was higher in HPV16（＋） than that in HPV16（-） （P〈0.05）. Conclusion： The RASSFIA gene change is a relatively late event in cervical carcinomas. The detection of LOH and MSI of RASSFIA gene might be helpful to the early diagnosis and the screening of cervical carcinoma. It might also be useful for predicting the prognosis of cervical carcinoma.展开更多
目的探讨肺癌患者痰标本中FH IT、P16、MGMT、RASSF1A和APC等抑癌基因启动子异常甲基化及其联合检测在肺癌筛查及早期诊断中的价值。方法采用甲基化特异性PCR(methylation specific PCR,MSP)法,检测47例肺癌组织及对应的痰标本FHIT、P16...目的探讨肺癌患者痰标本中FH IT、P16、MGMT、RASSF1A和APC等抑癌基因启动子异常甲基化及其联合检测在肺癌筛查及早期诊断中的价值。方法采用甲基化特异性PCR(methylation specific PCR,MSP)法,检测47例肺癌组织及对应的痰标本FHIT、P16,MGMT、RASSF1A和APC基因启动子区甲基化状态。24例肺良性疾病患者痰标本作为对照。结果 47例肺癌组织标本中FHIT、P16、MGMT、RASSF1A、APC基因启动子区甲基化检出率分别为40.4%(19/47)、53.2%(25/47)、36.2%(17/47)、21.3%(10/47)和38.3%(18/47);对照的痰标本中五者甲基化检出率分别为38.3%(18/47)、48.9%(23/47)、36.2%(17/47)、17.0%(8/47)和29.8%(14/47),两组甲基化检出率存在着一致性[P>0.05;κ(0.8～1.0)]。24例肺良性病变痰标本中未检测到任何异常甲基化,与肺癌组比较差异有统计学意义(P<0.05)。五项指标联合检测可明显提高肺癌检测的灵敏度(80.9%)和特异度(100.0%)。FHIT和P16基因痰标本甲基化检出率与患者吸烟指数有相关性(P<0.05)。结论痰标本中多个肺癌相关基因甲基化联合检测有望成为肺癌筛查、早期诊断简便有效的指标。展开更多
目的:通过检测上尿路尿路上皮癌(upper tract urothelial carcinoma,UTUC)组织中RAS相关结构域家族蛋白1异构体A(RAS-association domain family protein 1 isoform A,RASSF1A)基因启动子区域的甲基化状态,探讨RASSF1A基因异常甲基化与...目的:通过检测上尿路尿路上皮癌(upper tract urothelial carcinoma,UTUC)组织中RAS相关结构域家族蛋白1异构体A(RAS-association domain family protein 1 isoform A,RASSF1A)基因启动子区域的甲基化状态,探讨RASSF1A基因异常甲基化与患者临床病理特征以及术后复发的关系。方法:采用回顾性分析方法,共入选687例在北京大学第一医院泌尿外科接受手术的UTUC患者,通过甲基化特异性聚合酶链反应的方法对RASSF1A基因启动子区域的甲基化状态进行检测。结果:UTUC组织中RASSF1A基因的甲基化率为26.6%(183/687),RASSF1A基因异常甲基化与患者年龄、性别、肿瘤多发、术前输尿管镜检查、根治性手术、肿瘤直径及合并原位癌均无相关性(P>0.05),但分别与患者吸烟史(P=0.044)、患侧肾积水(P<0.001)、肿瘤位置(P<0.001)、肿瘤形态(P=0.013)、肿瘤分期(P=0.001)、肿瘤分级(P=0.007)以及淋巴结转移(P=0.001)相关,而且后四项均为提示肿瘤恶性程度高和预后不良的病理特征。RASSF1A基因的异常甲基化状态是患者术后膀胱复发(P<0.001,HR=0.471)和对侧上尿路复发(P=0.030,HR=0.269)的独立危险因素。RASSF1A基因启动子高甲基化组的UTUC患者术后的膀胱无复发生存时间和对侧无复发生存时间均比低甲基化组长,其无复发生存时间较长和累积无复发生存率较高,此外,肿瘤多发(P=0.002,HR=1.538)和术前输尿管镜检(P=0.001,HR=1.725)分别是UTUC患者术后膀胱复发的独立危险因素。结论:RASSF1A基因启动子区域的甲基化状态是与UTUC肿瘤恶性程度显著相关的表观遗传学生物标记物和尿路复发的预后因素。展开更多
目的:探讨甲基化转移酶抑制剂5-氮杂-2’-脱氧胞苷(5-Aza-2’-deoxycytidine,5-Aza-CdR)对人子宫内膜癌(Humanendometrial cancer,HEC)-1-B细胞增殖和凋亡的作用及其可能机制。方法:应用不同浓度的5-Aza-CdR处理HEC-1-B细胞,甲基化特异P...目的:探讨甲基化转移酶抑制剂5-氮杂-2’-脱氧胞苷(5-Aza-2’-deoxycytidine,5-Aza-CdR)对人子宫内膜癌(Humanendometrial cancer,HEC)-1-B细胞增殖和凋亡的作用及其可能机制。方法:应用不同浓度的5-Aza-CdR处理HEC-1-B细胞,甲基化特异PCR(Methylation-specific polymerase chain reaction,MSP)法检测处理前后RAS相关域家族1A(RAS association do-main family 1A,RASSF1A)基因甲基化状态,应用RT-PCR方法检测RASSF1A基因mRNA表达,MTT法检测细胞增殖,流式细胞术检测细胞凋亡率。结果:HEC-1-B细胞RASSF1A基因启动子区呈高甲基化状态,经过5-Aza-CdR处理后,RASSF1A基因启动子区呈去甲基化状态,其mRNA重新表达,细胞生长受到抑制,细胞凋亡增加。结论:5-Aza-CdR能够逆转RASSF1A基因甲基化状态,调控RASSF1A基因表达,并能有效地抑制HEC-1-B细胞的增殖和诱导细胞调亡。展开更多
基金a grant from the National Natural Sciences Foundation of China (No. 30571858)
文摘To investigate the relationship between the expression of RASSF1A protein and promoter hypermethylation of RASSF1A gene, RASSF1A protein expression was measured by Western blotting in 10 specimens of normal bladder tissues and 23 specimens of bladder transitional cell carcinoma （BTCC）. The promoter methylation in BTCC and normal bladder tissues was detected by methylation-specific PCR （MSP）. The results showed that the expression level of RASSF1A protein was significantly lower in BTCC tissues than that in normal bladder tissues. However, it was not correlated with its clinical stages and pathological grades. The frequency of promoter methylation of RASSF1A gene was higher in BTCC tissues than that in normal bladder tissues. In 14 patients with the aberrant promoter methylation, 13 showed loss or low expression of RASSF 1A protein. It is concluded that RASSF1A gene promoter methylation may contribute to the low level or loss of RASSF1A protein expression, the inactivation of RASSF1A gene and the genesis of BTCC. But, it may bear no correlation with its clinical stages and pathological grades.
文摘Objective： To explore the relationship between microsatellite alterations of RASSFIA gene and the development of cervical carcinoma, and its relationship with HPV16 infection. Methods： Two sites of microsatellite polymorphism of RASSFIA gene were selected. Polymerase chain reaction （PCR） technique was used to detect LOH and MSI in 50 cases of cervical carcinoma and 40 cases of cervical intraepithelial neoplasia （CIN）, and to detect the infection state of HPV16. Results： At D3S1478 and D3S4604, the LOH rates of cervical carcinomas were 32.6% （14/43） and 48.9% （23/47）, the MSI rates were 14% （6/43） and 19.1% （9/47）, respectively. The LOH rates of CINs were 31.4% （11/35） and 39.5% （15/38）, the MSI rates were 11.4% （4/35） and 15.8% （6/38）, respectively. There were no significant differences between cervical carcinomas and CINs in respect to their positive rates of LOH and MSI at D3S1478 and D3S4604 （P〉0.05）. There were significant differences in LOH rates at D3S1478 and D3S4604 between the stage Ⅰ-Ⅱ and Ⅲ-Ⅳ cervical carcinomas and between the well/moderately differentiated cervical carcinomas and the poorly differentiated cervical carcinomas （P〈0.05）. The positive rates of LOH and MSI for CIN Ⅲ and noninvasive cervical carcinomas were higher than those in CIN Ⅰ-Ⅱ. The rates of infection of HPV16 in cervical cancer was obviously higher than that in CIN and in normal cervical tissues （P〈0.05）, and the incidence of LOH of RASSFIA gene was higher in HPV16（＋） than that in HPV16（-） （P〈0.05）. Conclusion： The RASSFIA gene change is a relatively late event in cervical carcinomas. The detection of LOH and MSI of RASSFIA gene might be helpful to the early diagnosis and the screening of cervical carcinoma. It might also be useful for predicting the prognosis of cervical carcinoma.
文摘目的探讨肺癌患者痰标本中FH IT、P16、MGMT、RASSF1A和APC等抑癌基因启动子异常甲基化及其联合检测在肺癌筛查及早期诊断中的价值。方法采用甲基化特异性PCR(methylation specific PCR,MSP)法,检测47例肺癌组织及对应的痰标本FHIT、P16,MGMT、RASSF1A和APC基因启动子区甲基化状态。24例肺良性疾病患者痰标本作为对照。结果 47例肺癌组织标本中FHIT、P16、MGMT、RASSF1A、APC基因启动子区甲基化检出率分别为40.4%(19/47)、53.2%(25/47)、36.2%(17/47)、21.3%(10/47)和38.3%(18/47);对照的痰标本中五者甲基化检出率分别为38.3%(18/47)、48.9%(23/47)、36.2%(17/47)、17.0%(8/47)和29.8%(14/47),两组甲基化检出率存在着一致性[P>0.05;κ(0.8～1.0)]。24例肺良性病变痰标本中未检测到任何异常甲基化,与肺癌组比较差异有统计学意义(P<0.05)。五项指标联合检测可明显提高肺癌检测的灵敏度(80.9%)和特异度(100.0%)。FHIT和P16基因痰标本甲基化检出率与患者吸烟指数有相关性(P<0.05)。结论痰标本中多个肺癌相关基因甲基化联合检测有望成为肺癌筛查、早期诊断简便有效的指标。
文摘目的:通过检测上尿路尿路上皮癌(upper tract urothelial carcinoma,UTUC)组织中RAS相关结构域家族蛋白1异构体A(RAS-association domain family protein 1 isoform A,RASSF1A)基因启动子区域的甲基化状态,探讨RASSF1A基因异常甲基化与患者临床病理特征以及术后复发的关系。方法:采用回顾性分析方法,共入选687例在北京大学第一医院泌尿外科接受手术的UTUC患者,通过甲基化特异性聚合酶链反应的方法对RASSF1A基因启动子区域的甲基化状态进行检测。结果:UTUC组织中RASSF1A基因的甲基化率为26.6%(183/687),RASSF1A基因异常甲基化与患者年龄、性别、肿瘤多发、术前输尿管镜检查、根治性手术、肿瘤直径及合并原位癌均无相关性(P>0.05),但分别与患者吸烟史(P=0.044)、患侧肾积水(P<0.001)、肿瘤位置(P<0.001)、肿瘤形态(P=0.013)、肿瘤分期(P=0.001)、肿瘤分级(P=0.007)以及淋巴结转移(P=0.001)相关,而且后四项均为提示肿瘤恶性程度高和预后不良的病理特征。RASSF1A基因的异常甲基化状态是患者术后膀胱复发(P<0.001,HR=0.471)和对侧上尿路复发(P=0.030,HR=0.269)的独立危险因素。RASSF1A基因启动子高甲基化组的UTUC患者术后的膀胱无复发生存时间和对侧无复发生存时间均比低甲基化组长,其无复发生存时间较长和累积无复发生存率较高,此外,肿瘤多发(P=0.002,HR=1.538)和术前输尿管镜检(P=0.001,HR=1.725)分别是UTUC患者术后膀胱复发的独立危险因素。结论:RASSF1A基因启动子区域的甲基化状态是与UTUC肿瘤恶性程度显著相关的表观遗传学生物标记物和尿路复发的预后因素。
文摘目的:探讨甲基化转移酶抑制剂5-氮杂-2’-脱氧胞苷(5-Aza-2’-deoxycytidine,5-Aza-CdR)对人子宫内膜癌(Humanendometrial cancer,HEC)-1-B细胞增殖和凋亡的作用及其可能机制。方法:应用不同浓度的5-Aza-CdR处理HEC-1-B细胞,甲基化特异PCR(Methylation-specific polymerase chain reaction,MSP)法检测处理前后RAS相关域家族1A(RAS association do-main family 1A,RASSF1A)基因甲基化状态,应用RT-PCR方法检测RASSF1A基因mRNA表达,MTT法检测细胞增殖,流式细胞术检测细胞凋亡率。结果:HEC-1-B细胞RASSF1A基因启动子区呈高甲基化状态,经过5-Aza-CdR处理后,RASSF1A基因启动子区呈去甲基化状态,其mRNA重新表达,细胞生长受到抑制,细胞凋亡增加。结论:5-Aza-CdR能够逆转RASSF1A基因甲基化状态,调控RASSF1A基因表达,并能有效地抑制HEC-1-B细胞的增殖和诱导细胞调亡。
