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Hybridization studies of cultured human pituitary prl and gh producing adenoma cells: Effects of thyrotropin-releasing hormone, somatostatin, and phorbol ester

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Abstract

The effects of the hypothalamic hormones, thyrotropin-releasing hormone (TRH), and somatostatin (SRIH), and of phorbol 12-myristate 13-acetate (PMA) on PRL and GH secretion and messenger RNA (mRNA) levels were analyzed in 10 GH and/or PRL producing adenomas after culturing the tumor cells in the presence of these secretagogues for 7 days. The expression of chromogranin A and B mRNAs was also examined. All four of the clinically diagnosed GH adenomas expressed or secreted both GH and PRL while four of six clinically diagnosed prolactinomas produced or secreted both PRL and GH. Prolactinomas had less than 10% of tumor cells expressing chromogranin A mRNA while more than 40% of the adenoma cells expressed chromogranin B mRNA. TRH stimulated PRL secretion and increased PRL mRNA levels while SRIH decreased GH secretion and mRNA expression in some cases. Unexpectedly, PMA stimulated PRL mRNA levels four- to sevenfold above control levels in two adenomas and generally stimulated chromogranin A and B mRNA expression but not GH mRNA, as determined by Northern hybridization and in situ hybridization analyses.

These results indicate that cultured prolactinoma cells express significantly more chromogranin B mRNA than chromogranin A mRNA, and that PMA increases PRL mRNA expression in some prolactinomas, although the effect of PMA on various adenomas reflects the heterogeneity of these tumors with respect to protein kinase C stimulation.

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Authors and Affiliations

  1. Departments of Pathology (LJ, JS, BGE, JBS, RVL), Surgery—Section of Neurosurgery (WFC), and Medicine (AB) University of Michigan Medical School, Ann Arbor

    Long Jin, Jiangyue Song, William F. Chandler, Barry G. England, James B. Smart, Ariel Barkan & Ricardo V. Lloyd

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  2. Jiangyue Song
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Jin, L., Song, J., Chandler, W.F. et al. Hybridization studies of cultured human pituitary prl and gh producing adenoma cells: Effects of thyrotropin-releasing hormone, somatostatin, and phorbol ester. Endocr Pathol 1, 25–36 (1990). https://doi.org/10.1007/BF02915152

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