癌变·畸变·突变 ›› 2001, Vol. 13 ›› Issue (3): 137-140.doi: 10.3969/j.issn.1004-616x.2001.03.001

• 论著 •    下一篇

HPV18 E6 E7 基因诱发的人胎儿食管上皮永生化和恶性转化细胞端粒长度和端粒酶活性

许丽艳1, 沈忠英1, 李恩民2, 蔡唯佳1, 沈 健1, 李 淳1, 洪超群3, 陈炯玉3, 曾 毅4   

  1. 1. 汕头大学医学院肿瘤病理研究室,广东 汕头 515031 ;2. 汕头大学医学院生物化学与分子生物学教研室,广东 汕头 515031 ;3. 汕头大学医学院肿瘤医院,广东 汕头 515031 ;4. 中国预防医学科学院病毒学研究所,北京 100052)
  • 收稿日期:2000-09-03 修回日期:2001-04-06 出版日期:2001-07-30 发布日期:2001-07-30

TELOMERE LENGTH AND TELOMERASE ACTIVITY IN IMMORTALIZED AND MALIGNANTLY TRANSFORMED HUMAN EMBRYONIC ESOPHAGEAL EPITHELIAL CELL LINES BY E6 AND E7 GENES OF HPV 18 TYPE

XU Li-yan, SHEN Zhong-ying, LI En-min, etal .   

  1. Pathological Department, Shantou University Medical College, Shantou 515031, China
  • Received:2000-09-03 Revised:2001-04-06 Online:2001-07-30 Published:2001-07-30

摘要: 目的:探讨端粒长度、端粒酶活性以及端粒酶亚单位组分(hTERT、hTR) 的表达与食管上皮细胞永生化和恶性转化之间的关系。方法:对HPV18E6E7 基因诱发的人胎儿食管上皮永生化细胞系SHEE 和恶性转化细胞系SHEEC ,通过Southern blot 检测端粒长度( TRF) ,TRAP 法测定端粒酶活性,RT-PCR 研究端粒酶催化亚单位(hTERT) 和端粒酶RNA 成分(hTR) 的表达。结果:SHEE 细胞和SHEEC 细胞的端粒平均长度比正常食管上皮细胞的明显缩短,但稳定维持在一定长度范围内。SHEE 细胞和SHEEC 细胞均具有端粒酶活性,并均有hTERT 和hTR 表达。结论:端粒酶表达活化使端粒维持在一定长度是永生化食管上皮细胞SHEE 和恶性转化细胞SHEEC 能够稳定分裂增殖的重要因素之一。

关键词: 端粒长度, 端粒酶, 食管癌细胞系, 恶性转化, 永生化

Abstract: Purpose : To study the relationship of the telomere length and telomerase activity to immortalization or malignant t ransformation of the immortalized esophageal epithelial cell line (SHEE) and malignantly t ransformed cell line (SHEEC) induced by E6 and E7 genes of HPV 18 type. Methods : Using SHEE and SHEEC cell lines , the telomere length (mean length of telomere rest riction f ragment s , TRF) was examined by Southern blotting , the telomerase activity by the PCR2based telomeric repeat amplification protocol ( TRAP) and the expression of human telomerase reverse t ranscriptase ( hTERT) and human telomerase RNA ( hTR) by reverse t ranscription polymerase chain reaction(RT - PCR) . Results : The telomere length in the SHEE and SHEEC was significantly shorter than that in the normal esophageal epithelial tissue , but maintained a stable length. The telomerase activity and it s subunit hTERT and hTR were observed in the SHEE and SHEEC. Conclusion : A possible cause of stable division of SHEE and SHEEC is telomerase reactivitied , which maintains the telomere at a shortened and stable length.

Key words: telomere length, telomerase, esophageal cancer cell line, malignant t ransformation, immotalization

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