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Relation of oestradiol-mediated growth stimulation with the expression of c-erbB-2 protein in xenotransplanted oestradiol-receptor-positive and -negative breast carcinomas

  • Original Paper
  • Experimental Oncology
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Abstract

Attempts were made to correlate growth effects induced by oestradiol and tamoxifen with the hormonal regulation of c-erbB-2 protein in experiments in vivo. We report here the responsiveness of four xenotransplanted oestrogen-receptor(ER)-positive and four ER-negative human mammary carcinomas to oestradiol and tamoxifen. Oestradiol in a dose of 0.5 mg/kg significantly increased the growth of the ER-positive mammary carcinomas 3366, MCF-7, 4134 and 4049, but not the ER-negative tumours 4000, 4296 and MT-3. However, within the group of the ER-negative breast carcinomas the tumour 4151 ES deviates from this growth behaviour, as we could prove an estrogen induced growth. The stimulation of tumour growth by oestradiol was always accompanied by a down-regulation of c-erbB-2 protein both in the ER-positive mammary carcinomas and in the ER-negative mammary carcinoma 4151 ES. Tamoxifen significantly inhibited the growth of the ER/PR-positive mammary carcinomas 3366 and MCF-7 but not the ER-positive/PR-negative mammary carcinomas 4049 and 4134. In the group of ER-negative mammary carcinomas only the growth of the oestrogen-responsive tumour 4151 ES was significantly inhibited by tamoxifen. The inhibition of tumour growth by tamoxifen was correlated with a reversion of the oestradiol-induced down-regulation of c-erbB-2, also in the ER-negative/oestradiol-responsive mammary carcinoma 4151 ES. From our results we hypothesize that the oestrogen-dependent growth of ER-negative breast carcinoma 4151 ES could also be correlated with the oestradiol-regulated expression of c-erbB-2 protein.

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Abbreviations

ER :

Oestradiol receptor

PR :

Progesterone receptor

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Authors and Affiliations

  1. Max-Delbrück-Centre for Molecular Medicine, Robert-Rössle-Str. 10, 13125, Berlin, Germany

    Helga Naundorf, Wolfgang Zschiesche, Susanne Reinecke, Britta Büttner & Iduna Fichtner

  2. Experimental Oncology, Research Laboratories of Schering AG, Berlin, Germany

    Karsten Parczyk

  3. Clinic of Radiation Oncology, Humbolt-University, Charité, Berlin, Germany

    Gert-Jörg Saul & Brigitte Sinn

Authors
  1. Helga Naundorf
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  2. Karsten Parczyk
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  3. Wolfgang Zschiesche
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  4. Susanne Reinecke
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  5. Britta Büttner
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  6. Gert-Jörg Saul
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  7. Brigitte Sinn
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  8. Iduna Fichtner
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Naundorf, H., Parczyk, K., Zschiesche, W. et al. Relation of oestradiol-mediated growth stimulation with the expression of c-erbB-2 protein in xenotransplanted oestradiol-receptor-positive and -negative breast carcinomas. J Cancer Res Clin Oncol 122, 14–20 (1996). https://doi.org/10.1007/BF01203068

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  • DOI: https://doi.org/10.1007/BF01203068

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