We are analyzing https://link.springer.com/article/10.1007/s10549-008-0113-3.

Title:
Establishment of an in vitro estrogen-dependent mouse mammary tumor model: a new tool to understand estrogen responsiveness and development of tamoxifen resistance in the context of stromal–epithelial interactions | Breast Cancer Research and Treatment
Description:
Currently, to our knowledge, there are no continuous cell lines derived from estrogen dependent, tamoxifen sensitive spontaneous mouse mammary carcinomas. We describe here the establishment and characterization of a cell line derived from the M05 mouse mammary tumor, LM05-Mix, composed of both an epithelial and a fibroblastic component. From it the respective epithelial LM05-E and fibroblastic LM05-F cell lines were generated by limiting dilution. Immunofluorescence studies confirmed that the epithelial cells were positive for E-cadherin, cytokeratins and vimentin whereas the fibroblastic cells were negative for the epithelial markers and positive for α-smooth muscle actin and vimentin. Both cell types expressed estrogen and progesterone receptors, although only the epithelial LM05-E cells were stimulated by estradiol and inhibited by tamoxifen. In the bicellular LM05-Mix cell line estradiol proved to stimulate cell proliferation whereas the response to tamoxifen was dependent on confluency and the degree of epithelial-fibroblastic interactions. The presence of membrane estrogen receptors in both cell types was suggested by the achievement of non-genomic responses to short treatments with estradiol, leading to the phosphorylation of ERK1/2. Finally, cytogenetic studies suggest that these two cell types represent independent cell populations within the tumor and would not be the result of an epithelial-mesenchymal transition. This model presents itself as a valuable alternative for the study of estrogen responsiveness and tamoxifen resistance in the context of epithelial-stromal interactions.
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Keywords {🔍}

cancer, article, breast, google, scholar, cell, cas, pubmed, estrogen, mammary, tamoxifen, tumor, mouse, cells, establishment, epithelial, access, res, privacy, cookies, content, research, model, interactions, simian, lines, derived, characterization, buenos, aires, publish, search, vitro, resistance, rodriguez, fabris, kier, marina, line, receptors, carcinoma, argentina, data, information, log, journal, responsiveness, development, context, study,

Topics {✒️}

month download article/chapter epithelial-mesenchymal transition mammary adenocarcinomas induced α-smooth muscle actin related subjects murine epithelial cells marina simian epithelial-mesenchymal transitions estrogen receptor characterization breast cancer incidence membrane estrogen receptors human breast carcinomas spontaneous estrogen dependent study hormone-responsiveness breast tumor fibroblasts full article pdf epithelial cells cell line derived privacy choices/manage cookies epithelial-stromal interactions stromal–epithelial interactions human cell line breast cancer respective epithelial lm05 understand estrogen responsiveness fibroblastic cells stimulate cell proliferation pleural effusion derived epithelial-fibroblastic interactions breast carcinoma european economic area immunofluorescence studies confirmed cytogenetic studies suggest standardized genetic nomenclature mice standard karyotype immune competent mice article pontiggia cancer cell 13 conditions privacy policy check access instant access hormone dependence cure grant awarded de bruin estrogen dependent accepting optional cookies biología molecular cell lines cell types article log

Schema {🗺️}

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         description:Currently, to our knowledge, there are no continuous cell lines derived from estrogen dependent, tamoxifen sensitive spontaneous mouse mammary carcinomas. We describe here the establishment and characterization of a cell line derived from the M05 mouse mammary tumor, LM05-Mix, composed of both an epithelial and a fibroblastic component. From it the respective epithelial LM05-E and fibroblastic LM05-F cell lines were generated by limiting dilution. Immunofluorescence studies confirmed that the epithelial cells were positive for E-cadherin, cytokeratins and vimentin whereas the fibroblastic cells were negative for the epithelial markers and positive for α-smooth muscle actin and vimentin. Both cell types expressed estrogen and progesterone receptors, although only the epithelial LM05-E cells were stimulated by estradiol and inhibited by tamoxifen. In the bicellular LM05-Mix cell line estradiol proved to stimulate cell proliferation whereas the response to tamoxifen was dependent on confluency and the degree of epithelial-fibroblastic interactions. The presence of membrane estrogen receptors in both cell types was suggested by the achievement of non-genomic responses to short treatments with estradiol, leading to the phosphorylation of ERK1/2. Finally, cytogenetic studies suggest that these two cell types represent independent cell populations within the tumor and would not be the result of an epithelial-mesenchymal transition. This model presents itself as a valuable alternative for the study of estrogen responsiveness and tamoxifen resistance in the context of epithelial-stromal interactions.
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         Estrogen receptor
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