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Ontogeny of the circadian rhythm in medial basal hypothalamic ß-endorphin content in female rat

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Abstract

The present study evaluated the possible role of estrogens in generating the circadian rhythm of medial basal hypothalamus content at the time of puberty in female rats. Accordingly, changes in medial basal hypothalamus ß-endorphin (ß-EP) content were investigated in female rats, before and at puberty. Groups of intact or ovariectomized rats were studied after estradiol-benzoate or placebo treatment. The results showed that circadian rhythm of ß-EP content of medial basal hypothalamus is absent in prepubertal rats, while it appears at puberty, associated to a significant increase of ß-EP concentration. The primary involvement of steroids in generating this circadian rhythm was supported by the finding that estradiol-benzoate treatment caused a precocious appearance of ß-EP hypothalamic diurnal changes in prepubertal rats. Moreover, estradiol-benzoate replacement restored the loss of ß- EP nocturnal increase induced by ovariectomy in pubertal animals. Therefore, these data support the significant role of estrogen in inducing the circadian rhythm of ß-EP content in medial basal hypothalamus at the time of puberty in female rats.

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Authors and Affiliations

  1. Dipartimento di Scienze Morfologiche e Medico Legali, University of Modena, Modena, Italy

    M. Criscuolo, C. De Gaetani, G. Ficarra, M. Migaldi &  G. P. Trentini

  2. Istituto di Clinica Ostetrica e Ginecologica, University of Modena, Modena, Italy

    R. E. Nappi, F. Petraglia & A. R. Genazzani

Authors
  1. M. Criscuolo
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  2. C. De Gaetani
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  3. G. Ficarra
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  4. R. E. Nappi
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  5. M. Migaldi
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  6. F. Petraglia
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  7. A. R. Genazzani
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  8. G. P. Trentini
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Work supported in part by a research grant from Italian Ministero dell’Università e della Ricerca Scientifica, quota 60%.

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Criscuolo, M., De Gaetani, C., Ficarra, G. et al. Ontogeny of the circadian rhythm in medial basal hypothalamic ß-endorphin content in female rat. J Endocrinol Invest 17, 697–701 (1994). https://doi.org/10.1007/BF03347761

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  • DOI: https://doi.org/10.1007/BF03347761

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