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Restoration of Hormone Dependency in Estrogen Receptor - Lipofected MDA-MB-231 Human Breast Cancer Cells / 대한암학회지
Article em Ko | WPRIM | ID: wpr-163105
Biblioteca responsável: WPRO
ABSTRACT
PURPOSE: The loss of estrogen and progesterone receptors appeats to be associated with a progression to less differentiated and hormone-independent tumors. The gain of hormone independency over time even in estrogen receptor-positive tumors has become another obstacle to endocrine therapy for breast cancer. We tried to regain the hormone dependency in estrogen receptor-negative breast cancer cells by lipofecting estmgen receptor cDNA. MATERIALS AND METHODS: The mutant human estrogen receptor cDNA (pSGS-HEO) was lipofected into estrogen receptor-negative human breast cancer cell line MDA-MB-231, in an attempt to restore their sensitivity to antiestrogen. Then the effects of 17p-estradiol and tamoxifen were studied by counting viable cell numbers after treating the lipofected cell line with either one or together. RESULTS: Culture medium cantaining phenol red, a weak estrogen, has growth advantages compared with culture medium without it. In both culture conditions, cell growth was most profoundly inhibited in 4 days after lipofection with mutant human estrogen receptor cDNA, which was overcome after that day. Tamoxifen, as an antiestrogen, showed a growth inhibitory effect slightly stronger tban combined conditions of tamoxifen and 17- estradiol compared to estrogen-treated group and to control, and the inhibitory effect was lasted 4 days. CONCLUSION: The temporary induction of estrogen receptor by lipofection with pSGS-HEO on estrogen receptor-negative human breast cancer cell line MDA-MB-231 showed negative growth control on these cells by tamoxifen, indicating that liposome-mediated estrogen receptor transfection may be used as a novel therapeutic strategy for hormane independent human breast cancers in the near future.
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Texto completo: 1 Base de dados: WPRIM Assunto principal: Fenolsulfonaftaleína / Tamoxifeno / Mama / Neoplasias da Mama / Transfecção / Terapia Genética / Receptores de Progesterona / Contagem de Células / Linhagem Celular / DNA Complementar Limite: Humans Idioma: Ko Revista: Journal of the Korean Cancer Association Ano de publicação: 1999 Tipo de documento: Article
Texto completo: 1 Base de dados: WPRIM Assunto principal: Fenolsulfonaftaleína / Tamoxifeno / Mama / Neoplasias da Mama / Transfecção / Terapia Genética / Receptores de Progesterona / Contagem de Células / Linhagem Celular / DNA Complementar Limite: Humans Idioma: Ko Revista: Journal of the Korean Cancer Association Ano de publicação: 1999 Tipo de documento: Article