Ob receptor in rabbit ovary and leptin regulation of PGF2α and progesterone release from corpora lutea
Articolo
Data di Pubblicazione:
2004
Citazione:
Ob receptor in rabbit ovary and leptin regulation of PGF2α and progesterone release from corpora lutea / M. Zerani, C. Boiti, G. Brecchia, C. Dall'Aglio, P. Ceccarelli, A. Gobbetti. - In: JOURNAL OF ENDOCRINOLOGY. - ISSN 0022-0795. - 182:2(2004 Nov), pp. 279-288.
Abstract:
We studied leptin involvement in rabbit corpora lutea (CL) activity. and its post-transcriptional signalling pathway. The expression of leptin receptor (Ob-R) in rabbit ovary at day 9 of pseudopregnancy was evaluated by immunohistochemistry and Western blot analysis. The specificity of the Ob-R receptor antibodies was characterised by immunoprecipitation and competition with blocking peptide.]Day 9 CL were incubated in vitro with leptin alone or with inhibitors of PLC (phospholipase C), PLD (phospholipase D), AC (adenylate cyclase), JAK (janus kinase), MAPK (mitogen-activated protein kinase) and both cAMP- and cGMP-specific PDE (phosphodiesterase). Prostaglandin F2alpha (PGF2alpha), PGE2 and progesterone levels were measured in the culture medium, while NOS (nitric oxide synthase) and cAMP- and cGMP- specific PDE activities were measured in CL tissue. Positive staining for Ob-R was found within the cytoplasm of large luteal cells of CL as well as in granulosa cells of follicles and oocytes. Immunoblots detected a band of about 99 kDa size in Ob-R immunoprecipitates from CL homogenates. This band was not detectable after pre-incubation of the primary antibody with the immunising leptin peptide. Leptin increased PGF2alpha and cAMP-specific PDE, decreased basal progesterone and did not affect PGE2 and NOS levels. Leptin used the JAK pathway in increasing PGF2alpha., and MAPK and cAMP-specific PDE in decreasing progesterone. This study supports a permissive luteolytic role for leptin in rabbit CL.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Obese gene-product; growth-factor-I; menstrual-cycle; progesterone production; prostaglandin E-2; docking sites; map kinase; expression; reproduction; cells
Elenco autori:
M. Zerani, C. Boiti, G. Brecchia, C. Dall'Aglio, P. Ceccarelli, A. Gobbetti
Link alla scheda completa: