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Journal of Endocrinological Investigation

, Volume 16, Issue 7, pp 475–480 | Cite as

Poly (adenosine diphosphate-ribose) synthesis in the anterior pituitary of the female rat throughout the estrous cycle: Study of possible relation to cell proliferation and prolactin gene expression

  • Nobuhiko Suganuma
  • F. Kikkawa
  • H. Seo
  • N. Matsui
  • Y. Tomoda
Article

Abstract

To investigate whether cell proliferation and PRL gene expression in female rat pituitary during estrous cycle were mediated by the poly (ADP)-ribosylation of chromatin proteins, anterior pituitaries at different estrous cycle were obtained from female Wistar rats, and poly (ADP-ribose) synthesis, DNA synthesis, PRL and GH messenger RNAs and PRL content in the pituitary, and serum concentrations of PRL and estradiol were analyzed. From diestrus to proestrus, poly (ADP-ribose) synthesis, the contents of PRL messenger RNA and PRL in the pituitary increased significantly, and decreased at estrus. However, DNA synthesis and serum concentration of PRL showed a significant increase from proestrus to estrus. Serum estradiol concentration increased from diestrus to proestrus. No significant change was observed in the pituitary GH messenger RNA content during estrous cycle. The increase of PRL messenger RNA from diestrus to proestrus was abolished completely by the administration of nicotinamide, an inhibitor of poly (ADP-ribose) synthesis, to rats at diestrus. These results indicate that poly (ADP)-ribosylation of chromatin proteins may play some role in cell proliferation and transcription of PRL gene during rat estrous cycle.

Key-words

Poly (ADP-ribose) synthesis estrous cycle rat pituitary PRL DNA synthesis 

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Copyright information

© Italian Society of Endocrinology (SIE) 1993

Authors and Affiliations

  • Nobuhiko Suganuma
    • 1
  • F. Kikkawa
    • 1
  • H. Seo
    • 2
  • N. Matsui
    • 2
  • Y. Tomoda
    • 1
  1. 1.Department of Obstetrics and GynecologyNagoya University School of MedicineShowa-ku, Nagoya 466Japan
  2. 2.Department of Endocrinology and Metabolism, Research Institute of Environmental MedicineNagoya UniversityNagoyaJapan

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