Your browser doesn't support javascript.
loading
Distribution and regulation of gonadotropin-releasing hormone, kisspeptin, RF-amide related peptide-3, and dynorphin in the bovine hypothalamus.
Tanco, Valeria M; Whitlock, Brian K; Jones, Melaney A; Wilborn, Robyn R; Brandebourg, Terry D; Foradori, Chad D.
Afiliación
  • Tanco VM; Large Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee-Knoxville , Knoxville, TN , United States.
  • Whitlock BK; Large Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee-Knoxville , Knoxville, TN , United States.
  • Jones MA; Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University , Auburn, AL , United States.
  • Wilborn RR; Department of Clinical Sciences, College of Veterinary Medicine, Auburn University , Auburn, AL , United States.
  • Brandebourg TD; Department of Animal Sciences, College of Agriculture, Auburn University , Auburn, AL , United States.
  • Foradori CD; Department of Anatomy, Physiology, and Pharmacology, College of Veterinary Medicine, Auburn University , Auburn, AL , United States.
PeerJ ; 4: e1833, 2016.
Article en En | MEDLINE | ID: mdl-27014517
Recent work has led to the hypothesis that kisspeptin/neurokinin B/dynorphin (KNDy) neurons in the arcuate nucleus (ARC) play a key role in gonadotropin-releasing hormone (GnRH) pulse generation and gonadal steroid feedback, with kisspeptin driving GnRH release and neurokinin B and dynorphin acting as pulse start and stop signals, respectively. A separate cell group, expressing RFamide-related peptide-3 (RFRP-3) has been shown to be a primary inhibitor of GnRH release. Very little is known regarding these cell groups in the bovine. In this study, we examined the relative immunoreactivity of kisspeptin, dynorphin, and RFRP-3 and their possible connectivity to GnRH neurons in the hypothalami of periestrus and diestrus bovine. While GnRH and RFRP-3 immunoreactivity were unchanged, kisspeptin and dynorphin immunoreactivity levels varied in relation to plasma progesterone concentrations and estrous status. Animals with higher plasma progesterone concentrations in diestrus had lower kisspeptin and increased dynorphin immunoreactivity in the ARC. The percentage of GnRH cells with kisspeptin or RFRP-3 fibers in close apposition did not differ between estrous stages. However, the proportions of GnRH cells with kisspeptin or RFRP-3 contacts (∼49.8% and ∼31.3%, respectively) suggest direct communication between kisspeptin and RFRP-3 cells to GnRH cells in the bovine. The data produced in this work support roles for kisspeptin and dynorphin, within the KNDy neural network, in controlling GnRH release over the ovarian cycle and conveying progesterone-negative feedback onto GnRH neurons in the bovine.
Palabras clave
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: PeerJ Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: PeerJ Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos