LPS-induced inflammation potentiates the IL-1ß-mediated reduction of LH secretion from the anterior pituitary explants.
Clin Dev Immunol
; 2013: 926937, 2013.
Article
in En
| MEDLINE
| ID: mdl-23956762
ABSTRACT
Acting at the level of the brain, interleukin- (IL-)1 ß is considered to be one of the most potent downregulators of reproduction processes during immune/inflammatory challenge. IL-1 ß suppresses gonadotropin-releasing hormone (GnRH) secretion from the hypothalamus resulting in the inhibition of the luteinizing hormone (LH) release from the anterior pituitary (AP). However, the presence of IL-1 ß receptors in the AP suggests the possible direct action of this cytokine on LH secretion. The study was designed to determine the effect of IL-1 ß on the LH secretion from the AP explants collected from saline and LPS-treated ewes in the follicular phase. It was found that IL-1 ß suppressed (P ≤ 0.01) GnRH-stimulated LH release and LH ß gene expression in AP explants in both groups. However, IL-1 ß action was more potent in the explants collected from LPS-treated animals. Pituitaries from LPS-treated animals were characterized by increased (P ≤ 0.01) IL-1 type I receptor and decreased (P ≤ 0.01) GnRH receptor gene expression level compared to the saline-treated group. IL-1 ß also affected the GnRH-R gene expression in explants collected from LPS-treated animals. Our results show that direct action of IL-1 ß on the pituitary gonadotropes could be one of the reasons of the reproductive processes disorders accompanying an inflammatory state.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Pituitary Gland, Anterior
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Luteinizing Hormone
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Lipopolysaccharides
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Interleukin-1beta
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Inflammation
Limits:
Animals
Language:
En
Journal:
Clin Dev Immunol
Journal subject:
ALERGIA E IMUNOLOGIA
Year:
2013
Document type:
Article
Affiliation country: