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Expression and functional implications of Peroxisome Proliferator-Activated Receptor Gamma (PPARγ) in canine reproductive tissues during normal pregnancy and parturition and at antiprogestin induced abortion.
MedLine Citation:
PMID:  21196045     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PPARγ is a nuclear hormone receptor of the PPAR family of transcription factors closely related to the steroid hormone receptors serving multiple roles in regulating reproductive function. Endogenous factors from the arachidonic acid metabolites group serve as ligands for PPARs. PPARγ modifies the steroidogenic capacity of reproductive tissues and has been defined as a key mediator of biological actions of progesterone receptor in granulosa cells; it modulates biochemical and morphological placental trophoblast differentiation during implantation and placentation. However, no such information is available for the dog. Hence, the expression and possible functions of PPARγ were assessed in corpora lutea (CL) and utero/placental (Ut/Pl) compartment collected from bitches (n = 3 to 5) on days 8 to 12 (pre-implantation), 18 to 25 (post-implantation), 35 to 40 (mid-gestation) of pregnancy and at prepartal luteolysis. Additionally, 10 mid-pregnant bitches were treated with the antiprogestin Aglepristone [10mg/Kg bw (2x/24h)]; ovariohysterectomy was 24h and 72h after the 2nd treatment. Of the two PPARγ isoforms, PPARγ1 was the only isoform clearly detectable in all canine CL and utero/placental samples. The luteal PPARγ was upregulated throughout pregnancy, a prepartal downregulation was observed. Placental expression of PPARγ was elevated after implantation and at mid-gestation, followed by a prepartal downregulation. All changes were more pronounced at the protein-level suggesting that the PPARγ expression may be regulated at the post-transcriptional level. Within the CL PPARγ was localized to the luteal cells. Placental expression was targeted solely to the fetal trophoblast cells; a regulatory role of PPARγ in canine placental development possibly through influencing the invasion of fetal trophoblast cells is suggested. Treatment with Aglepristone led to downregulation of PPARγ in either compartment, implying the functional interrelationship with progesterone receptor.
Authors:
Mariusz Pawel Kowalewski; Andrea Meyer; Bernd Hoffmann; Selim Aslan; Alois Boos
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-12-31
Journal Detail:
Title:  Theriogenology     Volume:  -     ISSN:  1879-3231     ISO Abbreviation:  -     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2011-1-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0421510     Medline TA:  Theriogenology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2010 Elsevier Inc. All rights reserved.
Affiliation:
Institute of Veterinary Anatomy, Vetsuisse-Faculty, University of Zurich, 8057 Zurich, Switzerland.
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