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Identification of estrogen-inducible growth factors (estromedins) for rat and human mammary tumor cells in culture

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Summary

The role of polypeptide growth factors (estromedins) as mediators of estrogen-responsive mammary tumor growth is studied in this report. Three possible new mechanisms were investigated that include endocrine, autocrine, and paracrine related growth factors. The first hypothesis being tested is whether estrogens interact with target tissues and cause the biosynthesis and secretion of polypeptide growth factors, which then act as mitogens for normal and neoplastic mammary tissues. Data presented suggest that this mechanism involves estrogen interaction with uterus, kidney, and pituitary gland causing production of growth factors, which then enter the general circulation and promote growth of distant target tissues. This is an endocrine type mechanism. Another type of estromedin control (autocrine control) may be exerted in an autostimulatory way in which the target tissue produces the polypeptide factors for its own growth in response to estrogen stimulation. A variation of the autocrine mechanism may be a paracrine mechanism in which some cells of an estrogen-responsive normal or neoplastic tissue produce growth factors that act on adjacent or neighboring cells. From the data available, all three possible types of growth factors could be functioning synergistically to yield the final result of continuous estrogen responsive tumor growth in vivo.

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Author information

Authors and Affiliations

  1. Faculty of Nutrition, Kobe-Gakuin University, Igawadani-cho Arise, Nishi-ku, 673, Kobe, Japan

    Tatsuhiko Ikeda

  2. Department of Biochemistry, Guangxi Medical College, Nanning, Guangxi, People’s Republic of China

    Qi-fu Liu

  3. Department of Biochemistry and Molecular Biology, The University of Texas Medical School, 77025, Houston, Texas

    David Danielpour, Jefferson B. Officer, Frances E. Leland & David A. Sirbasku

  4. Kumamoto Women’s University, Kengun-cho, 862, Kumamoto, Japan

    Masayoshi Iio

Authors
  1. Tatsuhiko Ikeda
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  2. Qi-fu Liu
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  3. David Danielpour
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  4. Jefferson B. Officer
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  5. Masayoshi Iio
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  6. Frances E. Leland
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  7. David A. Sirbasku
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Additional information

Presented in the symposium on Plant and Animal Physiology in Vitro at the 33rd Annual Meeting of the Tissue Culture Association, San Diego, California, June 6–10, 1982.

This work was supported by American Cancer Society Grant BC-255; D. A. S. is the recipient of an American Cancer Society Faculty Research Award, FRA-212. D. D. is supported by a Rosalie B. Hite predoctoral fellowship from the Rosalie B. Hite Foundation, Houston, Texas.

This symposium was supported in part by the following organizations: Bellco Glass, Inc., California Branch of the Tissue Culture Association, Collaborative Research, Hana Media, Hybridtech, K C Biological, Inc., and Millipore Corporation.

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Ikeda, T., Liu, Qf., Danielpour, D. et al. Identification of estrogen-inducible growth factors (estromedins) for rat and human mammary tumor cells in culture. In Vitro Cell.Dev.Biol.-Plant 18, 961–979 (1982). https://doi.org/10.1007/BF02796371

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