Czech J. Anim. Sci., 2016, 61(8):360-368 | DOI: 10.17221/95/2015-CJAS

Peroxisome proliferator activated receptor ligands affect porcine endometrial steroids production during the estrous cycle and early pregnancy: an in vitro studyOriginal Paper

A. Kurzyńska¹, M. Bogacki², K. Chojnowska¹, I. Bogacka¹

¹ Department of Animal Physiology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland

² Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Olsztyn, Poland

In the present study, we investigated the effect of PPAR ligands on progesterone (P₄) and 17β-estradiol (E₂) secretion, as well as 3β-hydroxysteroid dehydrogenase/Δ(5)-Δ(4) isomerase (3β-HSD) mRNA expression, in porcine endometrial slices collected on days 10-12 and 14-16 of the estrous cycle or early pregnancy. The explants were incubated in vitro for 6 h in the presence of PPARα ligands - WY-14643 (agonist) and MK 886 (antagonist); PPARβ ligands - L-165041 (agonist) and GW 9662 (antagonist); PPARγ ligands - 15d-prostaglandin J₂ and rosiglitazone (agonists) and T0070907 (antagonist). During the estrous cycle, all PPAR ligands inhibited P₄ secretion during the mid-luteal phase (days 10-12). During early pregnancy, a stimulatory effect of PPARα agonist was observed during maternal recognition of pregnancy (days 10-12), while an inhibitory effect was observed at the beginning of implantation (days 14-16). PPAR ligands inhibited the expression of 3β-HSD mRNA on days 14-16 of the estrous cycle (β and γ isoforms) or pregnancy (α, β, γ isoforms) but did not affect gene expression on days 10-12 of the estrous cycle or early pregnancy. An inhibitory effect of PPARα, PPARγ, and PPARβ on E₂ secretion was observed during maternal recognition of pregnancy, but a stimulatory effect was observed during mid- (γ isoform) or late-luteal (β isoform) phases of the estrous cycle. Our study indicates, for the first time, that PPARs are engaged in P₄ and E₂ production in porcine endometrium. It is possible that the diverse receptivity of endometrial tissue to the PPAR ligands can be associated with the reproductive status of gilts.

Keywords: PPAR; progesterone; estradiol; luteal phase; periimplantation

Published: August 31, 2016  Show citation