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Effect of cyclosporine on hepatic cytosolic estrogen and androgen receptor levels before and after partial hepatectomy

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Abstract

Estrogen and androgen receptors within the liver have been reported to modulate the hepatic regenerative response to partial hepatectomy. Moreover, cyclosporine has several untoward effects that might occur as a consequence of alterations in sex hormone activity. To evaluate these questions the following experiments were performed. Estrogen and androgen receptors in cytosol were quantitated in livers of rats treated with cyclosporine or olive oil vehicle before and after partial hepatectomy or a sham operation. Ornithine decarboxylase activity and thymidine kinase activity were assessed as indices of hepatic regeneration. Preoperative levels of estrogen receptor activity in the hepatic cytosol were significantly greater in rats treated with cyclosporine as compared to vehicle treated controls (P<0.01). In contrast, preoperative levels of androgen receptor activity in the cyclosporine-treated and vehicle-treated animals were similar. Following partial hepatectomy, a reduction in the activity of both sex hormone receptors in the hepatic cytosol was observed and was compatible with results described previously in normal animals. Unexpectedly the preoperative levels of ornithine decarboxylase (P<0.01) and thymidine kinase activity (P<0.01) were significantly greater in the rats treated with cyclosporine as compared to the vehicle treated controls. As expected, ornithine decarboxylase activity (at 6 hr) and thymidine kinase activity (at 24 hr) rose and peaked in response to a partial hepatectomy but were significantly greater (P<0.05) in the rats treated with cyclosporine as compared to the vehicle. These results show that cyclosporine treatment causes an increase in the hepatic content of estrogen receptor activity that is associated with an enhanced potential for a regenerative response. These effects of cyclosporine treatment on the sex hormone receptor levels in liver may explain the mechanisms responsible for some of the untoward effects of treatment with this agent.

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Authors and Affiliations

  1. Departments of Surgery and Medicine, University of Pittsburgh School of Medicine, 15261, Pittsburgh, Pennsylvania

    D. Kahn ChM, FCS (SA), J. S. Gavaler PhD, H. Lai MD, L. Makowka MD, PhD, P. K. Eagon PhD, A. Francavilla MD, T. E. Starzl MD, PhD & D. H. Van Thiel MD

Authors
  1. D. Kahn ChM, FCS (SA)
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  2. J. S. Gavaler PhD
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  3. H. Lai MD
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  4. L. Makowka MD, PhD
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  5. P. K. Eagon PhD
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  6. A. Francavilla MD
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  7. T. E. Starzl MD, PhD
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  8. D. H. Van Thiel MD
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Additional information

Supported by research grants from the Veterans Administration project grant AM 29961, and from the NIDDK AM 32556, and from the NIAAA AA06601.

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Kahn, D., Gavaler, J.S., Lai, H. et al. Effect of cyclosporine on hepatic cytosolic estrogen and androgen receptor levels before and after partial hepatectomy. Digest Dis Sci 35, 6–11 (1990). https://doi.org/10.1007/BF01537215

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  • DOI: https://doi.org/10.1007/BF01537215

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