Neuroendocrine Responses to Social Regulation of Puberty in the Female House Mouse
| Autor: | John G. Vandenbergh, Jerome M. Goldman, Kirwin J. Darney |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Male
Aging endocrine system medicine.medical_specialty Adult male medicine.drug_class Dopamine Ovariectomy Endocrinology Diabetes and Metabolism Hypothalamus Hypothalamus Middle Urine House mouse Methoxyhydroxyphenylglycol Mice Norepinephrine Cellular and Molecular Neuroscience Endocrinology Internal medicine medicine Animals Sexual Maturation Social regulation Estrous cycle Mice Inbred ICR Estradiol biology Endocrine and Autonomic Systems digestive oral and skin physiology Luteinizing Hormone biology.organism_classification Preoptic Area Social Conditions 3 4-Dihydroxyphenylacetic Acid Female House mice Gonadotropin Luteinizing hormone hormones hormone substitutes and hormone antagonists |
| Zdroj: | Neuroendocrinology. 55:434-443 |
| ISSN: | 1423-0194 0028-3835 |
| DOI: | 10.1159/000126155 |
| Popis: | First estrus is advanced in female house mice exposed to an adult male and delayed in those housed in groups. Experiments were conducted to explore possible mechanisms by which the hypothalamus integrates these puberty-regulating social signals. Female mice weaned at 21 days of age were placed in groups of 8 (G8JF), a juvenile female with a juvenile male (JFJM) or juvenile female with an adult male (JFAM). All females were ovariectomized on day 28 and sacrificed on day 29. There was no significant difference between treatments in the postovariectomy rise in LH. Next, female mice were weaned, assigned to G8JF, JFJM or JFAM treatments and ovariectomized on day 22. Females were sacrificed on day 29, 3 h after injection with either 1.0 micrograms of estradiol, or vehicle. Estradiol significantly suppressed LH in all three treatments, with no differences between treatments. Two-way ANOVA (social treatment x estradiol treatment) revealed no differences or interactions in brain catecholamines as a result of estradiol injection. The G8JF treatment significantly increased norepinephrine, (NE), dopamine (DA) and its metabolite 3,4-dihydroxy-phenylacetic acid in the mediobasal hypothalamus (MBH), and the 3-methoxy-4-hydroxy-phenylglycol/NE ratio in the preoptic area (POA). In the final experiments, isolate prepubertal female mice were treated with either water or male urine (MU) on the oronasal groove. Eight days of MU treatment resulted in significant uterine growth, however there were no differences in serum LH, POA or MBH catecholamines or POA and median eminence LHRH. One hour after application of MU, serum LH was significantly elevated, however, there were no differences in accessory olfactory bulb catecholamines. These results suggest that the mechanism by which male and grouped female exposure alters first estrus may not involve changes in sensitivity to estradiol negative feedback. Grouping may delay first estrus through the negative effects of DA on the LHRH system in the MBH. We observed no differences that might help to explain how male exposure causes LH release. |
| Databáze: | OpenAIRE |
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