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Dissociation between brown adipose tissue thermogenesis and sympathetic activity in rats with high plasma levels of oestradiol

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Abstract

It has been shown previously that high plasma levels of oestradiol inhibit brown adipose tissue thermogenesis. Since rats and mice show a close association between thermogenic activity in and sympathetic discharge to brown fat, we measured the noradrenaline turnover in rats with high plasma levels of oestradiol to establish whether the observed inhibition of thermogenic activity is brought about by a reduction in the sympathetic drive to brown adipocytes. Oestradiol-filled Silastic capsules were implanted subcutaneously in female rats previously acclimated either to thermoneutrality or to cold. Control rats received empty implants. After 15 days treatment, noradrenaline turnover was measured by blocking its synthesis with α-methyl-p-tyrosine. As expected, noradrenaline turnover was higher in cold-acclimated rats than in rats kept at thermoneutrality. The presence of high plasma oestradiol levels did not alter sympathetic activity in any of the treated groups despite reducing thermogenic activity. This result reveals that oestradiol dissociates the thermogenic activity of brown adipose tissue from its sympathetic activation. Such dissociation has never been previously reported in rats, although it seems to be common in Syrian hamsters. However the causative factor in this species is unknown.

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Authors and Affiliations

  1. Departamento de Biología Animal II (Fisiología Animal), Facultad de Ciencias Biológicas, Universidad Complutense de Madrid, E-28040, Madrid, Spain

    María Paz Nava, Alberto Fernández, María Abelenda & Marisa Puerta

Authors
  1. María Paz Nava
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  2. Alberto Fernández
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  3. María Abelenda
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  4. Marisa Puerta
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Additional information

A preliminary report of this work was presented to the XXXIIth International Congress of Physiological Sciences, Glasgow, August 1993 and appears as abstract No. 287.6/P.

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Nava, M.P., Fernández, A., Abelenda, M. et al. Dissociation between brown adipose tissue thermogenesis and sympathetic activity in rats with high plasma levels of oestradiol. Pflugers Arch. 426, 40–43 (1994). https://doi.org/10.1007/BF00374668

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  • DOI: https://doi.org/10.1007/BF00374668

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