Physiological role of metastin/kisspeptin in regulating gonadotropin-releasing hormone (GnRH) secretion in female rats
| Autor: | Hiroko Tsukamura, Tamami Homma, Kenji Takase, Yoshihisa Uenoyama, Shunji Yamada, Kei-ichiro Maeda, Naoko Inoue, Satoshi Ohkura |
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| Rok vydání: | 2009 |
| Předmět: |
Male
endocrine system medicine.medical_specialty Physiology medicine.drug_class media_common.quotation_subject Population Estrous Cycle Gonadotropin-releasing hormone Biology Biochemistry Receptors G-Protein-Coupled Gonadotropin-Releasing Hormone Cellular and Molecular Neuroscience Endocrinology Kisspeptin Internal medicine medicine Animals Lactation education Ovulation media_common Feedback Physiological Neurons Kisspeptins education.field_of_study Arcuate Nucleus of Hypothalamus Proteins Estrogens Luteinizing Hormone Rats Estrogen Female Anteroventral periventricular nucleus Luteinizing hormone hormones hormone substitutes and hormone antagonists Receptors Kisspeptin-1 Hormone |
| Zdroj: | Peptides. 30:49-56 |
| ISSN: | 0196-9781 |
| DOI: | 10.1016/j.peptides.2008.08.004 |
| Popis: | Various studies have attempted to unravel the physiological role of metastin/kisspeptin in the control of gonadotropin-releasing hormone (GnRH) release. A number of evidences suggested that the population of metastin/kisspeptin neurons in the anteroventral periventricular nucleus (AVPV) is involved in generating a GnRH surge to induce ovulation in rodents, and thus the target of estrogen positive feedback. Females have an obvious metastin/kisspeptin neuronal population in the AVPV, but males have only a few cell bodies in the nucleus, suggesting that the absence of the surge-generating mechanism or positive feedback action in males is due to the limited AVPV metastin/kisspeptin neuronal population. On the other hand, the arcuate nucleus (ARC) metastin/kisspeptin neuronal population is considered to be involved in the regulation of tonic GnRH release. The ARC metastin/kisspeptin neurons show no sex difference in their expression, which is suppressed by gonadal steroids in both sexes. Thus, the ARC population of metastin/kisspeptin neurons is a target of estrogen negative feedback action on tonic GnRH release. The lactating rat model provided further evidence indicating that ARC metastin/kisspeptin neurons are involved in GnRH pulse generation, because pulsatile release of luteinizing hormone (LH) is profoundly suppressed by suckling stimulus and the LH pulse suppression is well associated with the suppression of ARC metastin/kisspeptin and KiSS-1 gene expression in lactating rats. |
| Databáze: | OpenAIRE |
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