Estrogen and progesterone do not activate Fos in AVPV or LHRH neurons in male rats
| Autor: | T. Schulterbrandt, Wei-Wei Le, Gloria E. Hoffman, Sandra J. Legan |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Male
medicine.medical_specialty medicine.drug_class Population Radioimmunoassay Estrogen receptor Cell Count Cerebral Ventricles Gonadotropin-Releasing Hormone Rats Sprague-Dawley Sex Factors Internal medicine Progesterone receptor medicine Animals education Molecular Biology Progesterone Neurons Analysis of Variance education.field_of_study biology General Neuroscience Estrogens Luteinizing Hormone Immunohistochemistry Preoptic Area Rats Oncogene Proteins v-fos medicine.anatomical_structure Endocrinology Gene Expression Regulation nervous system Estrogen biology.protein Female Neurology (clinical) Neuron NeuN Anteroventral periventricular nucleus Periventricular nucleus Developmental Biology |
| Zdroj: | Brain Research. 1054:116-124 |
| ISSN: | 0006-8993 |
| DOI: | 10.1016/j.brainres.2005.06.082 |
| Popis: | In rodents, females but not males, in response to escalating levels of estrogen, express a luteinizing hormone (LH) surge that is prompted by a surge in luteinizing hormone-releasing hormone (LHRH). It cannot take place if estrogen-sensitive afferents located in the anteroventral periventricular nucleus (AVPV) are either absent or disabled. Males appear to lack the ability to exhibit an LH surge, but it is unclear what level of the CNS contributes to this dimorphic response. This study was conducted to determine whether estrogen followed by progesterone treatment (E + P) of gonadectomized males evokes Fos activation in LHRH and AVPV neurons as it does in females. The results indicated that, consistent with the males' inability to express an LH surge in response to E + P treatment, LHRH and AVPV neurons in males failed to show increased Fos activation. Examination of neuron nuclear antigen (NeuN, a neuron-specific marker), estrogen receptor (ERα) and progesterone receptor (PR) neurons in AVPV neurons indicated that, while essentially all the neurons of the caudal AVPV in males and females are steroid responsive, the male possessed half the number of steroid responsive neurons within the caudal AVPV (where activation of Fos is maximal in females) compared to the female. Together, these data indicate that the male lacks a substantial population of steroid receptive AVPV neurons and is unable to respond to the presence of E and P and activate either AVPV or LHRH neurons. |
| Databáze: | OpenAIRE |
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