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Proliferation of a highly androgen-sensitive ductus deferens cell line (DDT1MF-2) is regulated by glucocorticoids and modulated by growth on collagen

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Summary

Proliferation of the hamster ductus deferens cloned tumor cell line (DDT1MF-2) in monolayer culture is markedly stimulated by androgens in a dose dependent fashion. Furthermore, growth on collagen confers upon these cells a greater dependence on this class of hormones, such that testosterone (10 nM) induces a 15-fold elevation in cell number compared to controls. Addition of either dexamethasone (10 nM) or triamcinolone acetonide (TA; 10 nM) dramatically blocks this stimulation by reversibly arresting the cells in the G1 phase of the cell cycle as assessed by flow cell cytometry. Associated with the decreased growth rate is a change from a rounded to a more flattened morphology that may also implicate cell shape in the regulation of proliferation.

These steroid effects presumably are mediated through specific receptor proteins for which dihydrotestosterone (DHT) and TA bind with equilibrium dissociation constants (Kd) of 0.3 and 1.0 nM, respectively. Moreover, not only do androgens increase growth rate but treatment with 1 nM [3H]DHT also results in an elevation in androgen receptor concentration from 1.6 to 3.6 f mol/μg DNA in 7 h. Simultaneous treatment with 10 nM TA, however, reduces this increase by 53%. Inasmuch as neither progesterone nor estradiol-17β display similar inhibitory activity, this effect also seems to be glucocorticoid specific. These observations may be important in elucidating the mechanism of androgen action and should provide some insight into the role of glucocorticoids in regulating the growth of androgen dependent tissues.

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Authors and Affiliations

  1. Department of Urology, Baylor College of Medicine, 77030, Houston, Texas

    Allan J. Syms & Roy G. Smith

  2. Department of Medicine and Physiology, University of Arkansas for Medical Sciences, 72205, Little Rock, Arkansas

    James S. Norris

  3. Department of Cell Biology, Baylor College of Medicine, 77030, Houston, Texas

    Roy G. Smith

Authors
  1. Allan J. Syms
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  2. James S. Norris
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  3. Roy G. Smith
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Additional information

This research was supported by Grant R01 CA 36264 from the National Institutes of Health, Bethesda, MD.

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Syms, A.J., Norris, J.S. & Smith, R.G. Proliferation of a highly androgen-sensitive ductus deferens cell line (DDT1MF-2) is regulated by glucocorticoids and modulated by growth on collagen. In Vitro 19, 929–936 (1983). https://doi.org/10.1007/BF02661714

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  • DOI: https://doi.org/10.1007/BF02661714

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