RGD Reference Report - Leptin modulates the expression of its receptors in the hypothalamic-pituitary-ovarian axis in a differential way. - Rat Genome Database

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Leptin modulates the expression of its receptors in the hypothalamic-pituitary-ovarian axis in a differential way.

Authors: Di Yorio, MP  Bilbao, MG  Pustovrh, MC  Prestifilippo, JP  Faletti, AG 
Citation: Di Yorio MP, etal., J Endocrinol. 2008 Aug;198(2):355-66. Epub 2008 May 30.
RGD ID: 5129110
Pubmed: PMID:18515494   (View Abstract at PubMed)
DOI: DOI:10.1677/JOE-07-0622   (Journal Full-text)

To investigate the expression of leptin receptors (Ob-R) in the rat hypothalamus-pituitary-ovarian axis, immature rats were treated with eCG/hCG and Ob-R expression was evaluated by western blot analysis. The Ob-R expression increased 24 h after eCG administration in all the tissues assayed. In the hypothalamus, these levels immediately decreased to those obtained without treatment. In the pituitary, the Ob-R expression continued to be elevated 48 h after eCG administration, whereas the hCG injection did not modify these levels. Similar results were obtained with the ovarian long isoform. To assess the effect of leptin on its receptors, Ob-R was assessed in hypothalamus, pituitary and ovarian explants cultured in the presence or absence of leptin (0.3-500 ng/ml). In the hypothalamus, we found a biphasic effect: the Ob-R expression was either reduced or increased at low or high concentrations of leptin respectively. LH-releasing hormone secretion increased at 1 ng/ml. In the pituitary, Ob-R increased at 10 or 30 ng/ml of leptin for the long and short isoforms respectively. Leptin also induced an increase in LH release at 30 ng/ml. In the ovarian culture, the presence of leptin produced an increase in Ob-R expression at different ranges of concentrations and a dose-dependent biphasic effect on the progesterone production. In conclusion, all these results clearly suggest that leptin is able to modulate the expression of its own receptors in the reproductive axis in a differential way. Moreover, the positive or negative effect that leptin exerts on the ovulatory process may be dependent on this regulation.

Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
response to leptin  IEP 5129110 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Lepr  (leptin receptor)


Additional Information