Repression of transforming effect of the HER-2/neu oncogene by the N-terminal domain of the EBNA-1 in breast cancer cells
碩士 === 國防醫學院 === 生物化學研究所 === 87 === The HER-2/neu protooncogene was known to overexpressed in approximately 30% of breast cancer patients and correlated with poor survival. Repression of HER-2/neu overexpression suppressed the malignant phenotype of HER-2/neu-overexpressing cancers. In our previous...
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ndltd-TW-087NDMC01070022016-07-11T04:14:09Z http://ndltd.ncl.edu.tw/handle/69965056556585438479 Repression of transforming effect of the HER-2/neu oncogene by the N-terminal domain of the EBNA-1 in breast cancer cells EB病毒核抗原-1氮端部位可抑制因神經膠原致癌基因過度表現之人類乳癌細胞的轉型特性 Feng-Lan Chiu 邱鳳蘭 碩士 國防醫學院 生物化學研究所 87 The HER-2/neu protooncogene was known to overexpressed in approximately 30% of breast cancer patients and correlated with poor survival. Repression of HER-2/neu overexpression suppressed the malignant phenotype of HER-2/neu-overexpressing cancers. In our previous study, we found that the N-terminal 86-amino-acid only of the Epstein-Barr virus nuclear antigen-1(EBNA1-NT) could act as a transforming suppressor of the HER-2/neu oncogene. However, the EBNA1-NT peptide is rather small and difficult to be analyzed by Western blot. Therefore, we established in this study a EBNA1-NT-T7Tag construct by adding a T7Tag, which is easily detected by a commercial available anti-T7Tag antibody, to the N-terminal end of the EBNA1-NT. This EBNA1-NT-T7Tag clone was found to reserve the same repressing effect as that of EBNA1-NT on the HER-2/neu promoter in the transfection experiment using NIH3T3 as recepient cells. Furthermore, the endogenous modulation of the HER-2/neu by EBNA1-NT-T7Tag was investigated by stable transfecting EBNA1-NT-T7Tag into the HER-2/neu-overexpressing human breast cancer MDA-MB453 cells and the low HER-2/neu-expressing human breast cancer MDA-MB231 cells. Although the level of p185 HER-2/neu was not dramatically reduced in MDA-MB453 cells with EBNA1-NT-T7Tag, the phosphorylated from of p185 HER-2/neuwas apparently decreased. In addition, the morphology of MDA-MB453 cells were reversed by the EBNA1-NT-T7Tag. The data shown that the EBNA1-NT-T7Tag could downregulate HER-2/neu oncogne. Taken together, these results may provide a therapeutic benefit for HER-2/neu-overexpressing human cancers. Ming-Ching Kao 高銘欽 1999 學位論文 ; thesis 64 zh-TW |
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碩士 === 國防醫學院 === 生物化學研究所 === 87 === The HER-2/neu protooncogene was known to overexpressed in approximately 30% of breast cancer patients and correlated with poor survival. Repression of HER-2/neu overexpression suppressed the malignant phenotype of HER-2/neu-overexpressing cancers. In our previous study, we found that the N-terminal 86-amino-acid only of the Epstein-Barr virus nuclear antigen-1(EBNA1-NT) could act as a transforming suppressor of the HER-2/neu oncogene. However, the EBNA1-NT peptide is rather small and difficult to be analyzed by Western blot. Therefore, we established in this study a EBNA1-NT-T7Tag construct by adding a T7Tag, which is easily detected by a commercial available anti-T7Tag antibody, to the N-terminal end of the EBNA1-NT. This EBNA1-NT-T7Tag clone was found to reserve the same repressing effect as that of EBNA1-NT on the HER-2/neu promoter in the transfection experiment using NIH3T3 as recepient cells. Furthermore, the endogenous modulation of the HER-2/neu by EBNA1-NT-T7Tag was investigated by stable transfecting EBNA1-NT-T7Tag into the HER-2/neu-overexpressing human breast cancer MDA-MB453 cells and the low HER-2/neu-expressing human breast cancer MDA-MB231 cells. Although the level of p185 HER-2/neu was not dramatically reduced in MDA-MB453 cells with EBNA1-NT-T7Tag, the phosphorylated from of p185 HER-2/neuwas apparently decreased. In addition, the morphology of MDA-MB453 cells were reversed by the EBNA1-NT-T7Tag. The data shown that the EBNA1-NT-T7Tag could downregulate HER-2/neu oncogne. Taken together, these results may provide a therapeutic benefit for HER-2/neu-overexpressing human cancers.
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author2 |
Ming-Ching Kao |
author_facet |
Ming-Ching Kao Feng-Lan Chiu 邱鳳蘭 |
author |
Feng-Lan Chiu 邱鳳蘭 |
spellingShingle |
Feng-Lan Chiu 邱鳳蘭 Repression of transforming effect of the HER-2/neu oncogene by the N-terminal domain of the EBNA-1 in breast cancer cells |
author_sort |
Feng-Lan Chiu |
title |
Repression of transforming effect of the HER-2/neu oncogene by the N-terminal domain of the EBNA-1 in breast cancer cells |
title_short |
Repression of transforming effect of the HER-2/neu oncogene by the N-terminal domain of the EBNA-1 in breast cancer cells |
title_full |
Repression of transforming effect of the HER-2/neu oncogene by the N-terminal domain of the EBNA-1 in breast cancer cells |
title_fullStr |
Repression of transforming effect of the HER-2/neu oncogene by the N-terminal domain of the EBNA-1 in breast cancer cells |
title_full_unstemmed |
Repression of transforming effect of the HER-2/neu oncogene by the N-terminal domain of the EBNA-1 in breast cancer cells |
title_sort |
repression of transforming effect of the her-2/neu oncogene by the n-terminal domain of the ebna-1 in breast cancer cells |
publishDate |
1999 |
url |
http://ndltd.ncl.edu.tw/handle/69965056556585438479 |
work_keys_str_mv |
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