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Thyroid hormone and apotransferrin regulation of growth hormone secretion by GH1 rat pituitary tumor cells in iron restricted serum-free defined medium

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Summary

Growth hormone (GH) production by GH1 rat pituitary tumor cells in iron restricted serum-free defined medium requires apotransferrin (apoTf) and triiodothyronine (T3). As measured by radioimmunoassay, apoTf plus T3 induced GH levels 2 to 4-fold above controls. Deletion of either apoTf or T3 arrested GH secretion. ApoTf/T3 defined medium regulated GH production as effectively as whole serum. Because glucocorticoids enhance GH secretion in serum containing cultures, the effects of dexamethasone were evaluated in apoTf/T3 defined medium. The steroid hormone showed no enhancing effects unless the cells were exposed to serum prior to incubation in apoTf/T3 defined medium. Even under these conditions, the response to dexamethasone remained T3 dependent. These observations indicate that a yet to be characterized serum factor(s), other than apoTf, regulates the reponse to the steroid hormone. This is the first report of thyroid hormone regulation of GH secretion by rat pituitary tumor cells under completely serum-free chemically defined conditions.

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Author notes

  1. Rajbabu Pakala

    Present address: Division of Cardiology, The University of Texas Medical School, 77225, Houston, TX

Authors and Affiliations

  1. The Department of Biochemistry and Molecular Biology, The University of Texas Medical School, 77225, Houston, Texas

    David A. Sirbasku, Rajbabu Pakala, Hidetaka Sato & John E. Eby

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  1. David A. Sirbasku
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  2. Rajbabu Pakala
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  3. Hidetaka Sato
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  4. John E. Eby
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Sirbasku, D.A., Pakala, R., Sato, H. et al. Thyroid hormone and apotransferrin regulation of growth hormone secretion by GH1 rat pituitary tumor cells in iron restricted serum-free defined medium. In Vitro Cell Dev Biol - Animal 28, 67–71 (1992). https://doi.org/10.1007/BF02631081

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