Adrenaline turnover rates in the medial preoptic area and mediobasal hypothalamus in relation to the release of luteinizing hormone in female rats |
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Authors: | MC Coombs CW Coen |
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Institution: | Department of Human Anatomy, University of Oxford, South Parks Road, Oxford OX1 3QX, U.K. |
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Abstract: | The turnover rates of adrenaline in the medial preoptic area and mediobasal hypothalamus, areas which, respectively, include the cell bodies and terminals of luteinizing hormone-releasing hormone neurons, have been measured in female rats on pro-oestrus, the day of the preovulatory surge of luteinizing hormone, and on dioestrus, the preceding day. A rise in the rate of turnover was found in the medial preoptic area coinciding with the surge of luteinizing hormone in the late afternoon of pro-oestrus; the rate of turnover at this time was higher than at the same time on dioestrus. No changes in turnover rate were found in the mediobasal hypothalamus within either of these days.The results indicate that the adrenaline-containing projections to the preoptic area may be actively involved in the production of the spontaneous preovulatory surge of luteinizing hormone in rats. |
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Keywords: | DA dopamine LH luteinizing hormone LHRH luteinizing hormone-releasing hormone MBH mediobasal hypothalamus MPOA medial preoptic area NA noradrenaline PNMT To whom correspondence should be addressed Present address: St Mary's Hospital Medical School Norfolk Place London W2 1PG U K |
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