Influence of the pineal gland, olfactory bulbs and photoperiod on surges of plasma prolactin in the female rat
| Autor: | R. R. Gala, D. R. Pieper |
|---|---|
| Rok vydání: | 1979 |
| Předmět: |
endocrine system
medicine.medical_specialty Light Endocrinology Diabetes and Metabolism medicine.medical_treatment Pinealectomy Biology Nocturnal Pineal Gland Pineal gland Endocrinology Internal medicine medicine Animals Pseudopregnancy photoperiodism Cervical stimulation Plasma prolactin Olfactory Bulb Prolactin Rats medicine.anatomical_structure Darkness Female hormones hormone substitutes and hormone antagonists |
| Zdroj: | The Journal of endocrinology. 82(2) |
| ISSN: | 0022-0795 |
| Popis: | SUMMARY The role of the pineal gland, olfactory bulbs and photoperiod in the regulation of the two daily surges of plasma prolactin in the pseudopregnant rat has been investigated. Pinealectomy had no effect on the surges of prolactin in pseudopregnant rats maintained on either a long (14 h light: 10 h darkness; 14L: 10D) or a short (2L: 22D) photoperiod, but olfactory bulbectomy decreased the nocturnal surge in animals maintained on 14L: 10D. This effect of bulbectomy was eliminated if the rats maintained on 14L: 10D were also pinealectomized. After cervical stimulation, bulbectomized rats maintained on a 2L: 22D photoperiod had nocturnal-type prolactin surges similar to those of intact rats maintained on the same photoperiod. These results indicate that the pineal gland and length of photoperiod are not involved in the regulation of the surges of plasma prolactin in pseudopregnant rats but that the olfactory bulbs may enhance the nocturnal surge. |
| Databáze: | OpenAIRE |
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