Exposure to female pheromones stimulates a specific type of neuronal population in the male but not female magnocellular division of the medial preoptic nucleus (MPN mag) of the Syrian hamster |
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Authors: | Jennifer M. Swann Holly A. Richendrfer Lindsay Dawson Elana Nack Jack Whylings Tim Garelick |
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Affiliation: | Lehigh University, Dept of Biological Sciences, United States |
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Abstract: | The magnocellular division of the medial preoptic area (MPN mag) integrates pheromonal and hormonal signals to play a critical role in the expression of male typical sex behavior. The MPN mag contains two morphologically distinct neuronal populations; the percentage of each type within the nucleus is sex specific. Males have more neurons with a single nucleolus whereas females have more with multiple nucleoli. To determine which neuronal subtype mediates pheromonal induction of copulation, tissue from male and female hamsters exposed to female pheromones was immunolabeled for the immediate early protein (EGR-1). Subsequently the tissue was counterstained and the number of ERG-1 neurons with one or two nuclei was determined. The results indicate that pheromones stimulate neurons with single nucleoli in males but fail to stimulate either neuronal subtype in females suggesting that synaptic input to the MPN mag is sexually differentiated. |
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Keywords: | IIIv, 3rd ventricle BST, Bed nucleus of the stria terminalis BSTpm, Bed nucleus of the stria terminalis posterior medial subdivision BSTpi, Bed nucleus of the stria terminalis posterior intermediate subdivision f, Fornix HVS, Hamster vaginal secretions MPN mag, Magnocellular division of the medial preoptic nucleus MPOA, Medial preoptic area Me, Medial nucleus of the amygdala MeA, Medial nucleus of the amygdala anterior subdivision MeP, Medial nucleus of the amygdala posterior subdivision ot, Optic tract sm, Stria medullaris |
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