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Regular Article |
a Département d'Ontogénie et Reproduction, Centre de Recherche en Biologie de la Reproduction, Centre de Recherche du CHUL, Université Laval, Ste-Foy, Québec, Canada GIV 4G2
b Département d'Obstétrique et Gynécologie, Université Laval, Ste-Foy, Québec, Canada GIV 4G2
c Centre de Recherche en Reproduction Animale, Département de Biomédecine Vétérinaire, Faculté de Médecine Vétérinaire, Université de Montréal, C.P. 5000, Saint-Hyacinthe, Québec, Canada J2S 7C6
In ruminants, endometrial prostaglandin F2
(PGF2) is responsible for luteolysis and prostaglandin E2 (PGE2) is thought to be involved in maternal recognition of pregnancy. In the present study, healthy uteri were collected from cows at the abattoir, and days of the estrous cycle were determined macroscopically. The uteri were classified into seven groups as Days 1–3, 4–6, 7–9, 10–12, 13–15, 16–18, and 19–21 of the estrous cycle. Endometrial scrapings were collected. The expression of cyclooxygenase (COX)-1 and COX-2 mRNAs and proteins and PGE synthase (PGES) mRNA was analyzed by Northern and Western blot. There was no expression of COX-1, either mRNA or protein, on any day of the estrous cycle. In contrast, COX-2 mRNA and protein were expressed at low and high levels on Days 1–12 and 13–21 of the estrous cycle, respectively. The level of expression of PGES was moderate, low, and high on Days 1–3, 4–12, and 13–21 of the estrous cycle, respectively. There were significant correlations between COX-2 mRNA and protein levels and between COX-2 and PGES mRNA levels. COX-1 mRNA and protein are not expressed on any day of the estrous cycle, whereas COX-2 mRNA and protein and PGES mRNA are differentially expressed and regulated in bovine endometrium during the estrous cycle. COX-2, rather than COX-1, is the primary isoenzyme involved in the endometrial production of prostaglandins, and the COX-2 and PGES pathway is responsible for the endometrial production of PGE2 in the bovine endometrium during the estrous cycle.
1 This work was supported by a grant from the Natural Sciences and Engineering Research Council of Canada to M.A.F. and in part by a Canadian Institute of Health Research (CIHR) grant (MT-13190) to J.S. J.S. is supported by a CIHR Investigator Award.
2 Correspondence. FAX: 418 654 2765; mafortier.crchul.ulaval.ca
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