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Bai R, Kusama K, Matsuno Y, Bai H, Sakurai T, Kimura K, Imakawa K. Expression of NFIL3 and CEBPA regulated by IFNT induced-PGE2 in bovine endometrial stromal cells during the pre-implantation period. Front Endocrinol (Lausanne) 2023; 14:1075030. [PMID: 36923228 PMCID: PMC10010167 DOI: 10.3389/fendo.2023.1075030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Accepted: 02/07/2023] [Indexed: 02/23/2023] Open
Abstract
Prostaglandin E2 (PGE2) is considered as a luteoprotective factor, influencing the corpus luteum during the early pregnant period in the bovine species. Cyclic AMP (cAMP) is activated in response to PGE2 and plays a role in many physiological processes. The maternal recognition signal, interferon τ (IFNT), induces PGE2 secretion from the endometrial epithelial cells, the function of which in stroma cells has not been completely understood. In this study, PGE2 was found to activate cAMP in the bovine endometrial stromal cells (STRs). STRs were then treated with forskolin to activate the cAMP signaling, from which RNA extracted was subjected to global expression analysis. Transcripts related to transcription regulatory region nucleic acid binding of molecular function, nucleus of cellular component, and mitotic spindle organization of biological processes were up-regulated in cAMP-activated bovine STRs. An increase in the transcription factors, NFIL3, CEBPA, and HIF1A via the cAMP/PKA/CREB signaling pathway in the bovine STRs was also found by qPCR. Knockdown of NFIL3, CEBPA, or HIF1A blocked forskolin-induced PTGS1/2 and IGFBP1/3 expression. Moreover, NFIL3 and CEBPA were localized in endometrial stroma on pregnant day 17 (day 0 = estrous cycle), but not on cyclic day 17. These observations indicated that uterine PGE2 induced by conceptus IFNT is involved in the early pregnancy-related gene expression in endometrial stromal cells, which could facilitate pregnancy establishment in the bovine.
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Affiliation(s)
- Rulan Bai
- National Key Laboratory of Veterinary Public Health Security, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Kazuya Kusama
- Department of Endocrine Pharmacology, Tokyo University of Pharmacy and Life Sciences, Tokyo, Japan
- *Correspondence: Kazuya Kusama,
| | - Yuta Matsuno
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY, United States
| | - Hanako Bai
- Laboratory of Animal Breeding and Reproduction, Research Faculty of Agriculture, Hokkaido University, Hokkaido, Japan
| | | | - Koji Kimura
- Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
| | - Kazuhiko Imakawa
- Research Institute of Agriculture, Tokai University, Kumamoto, Japan
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Liang C, Zhang X, Qi C, Hu H, Zhang Q, Zhu X, Fu Y. UHPLC-MS-MS analysis of oxylipins metabolomics components of follicular fluid in infertile individuals with diminished ovarian reserve. Reprod Biol Endocrinol 2021; 19:143. [PMID: 34521427 PMCID: PMC8438979 DOI: 10.1186/s12958-021-00825-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 09/02/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Diminished ovarian reserve (DOR) refers to a decrease in the number and quality of oocytes in the ovary, which results in a lack of sex hormones and a decline of fertility in women. DOR can potentially progress to premature ovarian failure (POF), which has a negative impact on women's quality of life and is a major cause of female infertility. Oxidative stress is a major contributor to fertility decrease in DOR patients, affecting the follicular microenvironment, oocyte maturation, fertilization, and embryo development. Understanding intracellular signal transduction can be achieved by defining specific oxidized lipid components in follicular fluid (FF) of DOR infertile patients. METHODS The oxylipins metabolic signatures in the FF of DOR patients and females with normal ovarian reserve (NOR) enrolled for the in vitro fertilization (IVF) cycle were analyzed using UHPLC-MS-MS technology. Principal component analysis (PCA) and orthogonal projections to latent structure discriminant analysis (OPLS-DA) were used to analyze the derived metabolomic profiles. Pathway enrichment analysis was carried out using the Kyoto Encyclopedia of Genes and Genomes (KEGG) and MetaboAnalyst databases. Furthermore, the Spearman rank correlation coefficient was used to determine the correlation between age, FSH, AMH, AFC, oocytes retrieved, MII oocytes, fertilization, high-quality embryos, and the concentration of differential oxidized lipid metabolites in FF. RESULTS Fifteen oxylipins metabolites were found to be lower in the FF of DOR patients than those in the NOR group, including ±20-HDoHE, ±5-iso PGF2α-VI, 12S-HHTrE, 15-deoxy-Δ12,14-PGJ2, 1a,1b-dihomo PGE2, 1a,1b-dihomo PGF2α, 20-COOH-AA, 20-HETE, 8S,15S-DiHETE, PGA2, PGD2, PGE1, PGF1α, PGF2α, and PGJ2. The pathway enrichment analysis revealed that the 15 differentially oxidized lipid metabolites were closely related to the arachidonic acid metabolic pathway. Correlation analysis revealed that the concentration of 8 different oxidized lipid metabolites in FF was negatively correlated to FSH and positively correlated with AFC. AMH, the number of oocytes retrieved, MII oocytes and fertilization, were all positively correlated with 9 different oxidized lipid metabolites, but only one metabolite was positively correlated with the number of high-quality embryos. CONCLUSIONS Metabolomic analysis of FF revealed that oxylipins metabolism disorders were closely related to ovarian reserve function. Among these oxylipins metabolites, arachidonic acid metabolism undergoes significant changes that may be related to oocyte development, resulting in decreased fertility in DOR patients. TRIAL REGISTRATION ChiCTR, ChiCTR2000038182 , Registered 12 September 2020-Retrospectively registered.
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Affiliation(s)
- Chengcheng Liang
- Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, China
- Department of Gynecology, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, 201203, Shanghai, China
| | - Xiaole Zhang
- Department of Gynecology, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, 201203, Shanghai, China
| | - Cong Qi
- Department of Gynecology, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, 201203, Shanghai, China
| | - Hui Hu
- Department of Gynecology, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, 201203, Shanghai, China
| | - Qinhua Zhang
- Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, 201204, China.
| | - Xiuxian Zhu
- Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, 201204, China
| | - Yonglun Fu
- Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, 201204, China
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Oxylipin concentrations in bovine corpora lutea during maternal recognition of pregnancy. Theriogenology 2019; 142:384-389. [PMID: 31708196 DOI: 10.1016/j.theriogenology.2019.10.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 10/04/2019] [Accepted: 10/08/2019] [Indexed: 12/20/2022]
Abstract
The objective was to determine the effects of pregnancy status on oxylipin profiles and eicosanoid metabolizing enzymes and in corpora lutea (CL) or endometrial (caruncle; CAR and intercaruncle; IC) tissues. Angus crossed cattle were synchronized with the CO-Synch protocol and artificially inseminated (AI). Sixteen days after AI, cattle were euthanized, and reproductive tracts collected from 6 non-pregnant and 6 pregnant cows. Oxylipin profiles and concentrations of progesterone (P4) were obtained from CL tissues. The activity of cytochrome P450 1A (CYP1A) and UDP-glucuronosyltransferase (UGT) enzymes were determined using specific luminogenic substrates. Data were analyzed using the MIXED procedure of SAS, and the model included pregnancy status. Corpora lutea of pregnant cattle contained greater (P < 0.05) concentrations of 9,10-DiHODE, 15,16-DiHODE, and 9,10-DiHOME. These oxylipins have been observed to increase cellular proliferation and vasodilation. Activity of CYP1A in the CL and UGT in CAR and IC was not different (P > 0.05) between pregnant and non-pregnant cattle. In the CL, activity of UGT was decreased (P < 0.05) in pregnant vs. non-pregnant cattle. The decrease in CL UGT activity during pregnancy indicates alterations in local hormone metabolism, while no differences in CL weight nor amount of P4 in CL were different between pregnant and non-pregnant cattle. Moreover, the increase in specific concentrations of oxylipins in the CL may indicate a novel pathway of steroid and eicosanoid metabolism during maternal recognition of pregnancy.
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Zhang N, Wang L, Luo G, Tang X, Ma L, Zheng Y, Liu S, A Price C, Jiang Z. Arachidonic Acid Regulation of Intracellular Signaling Pathways and Target Gene Expression in Bovine Ovarian Granulosa Cells. Animals (Basel) 2019; 9:ani9060374. [PMID: 31248190 PMCID: PMC6617051 DOI: 10.3390/ani9060374] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 06/09/2019] [Accepted: 06/12/2019] [Indexed: 12/17/2022] Open
Abstract
Simple Summary Arachidonic acid (AA) is one of the polyunsaturated fatty acids that presents in a very high proportion in the mammalian follicular fluid. However, the mechanism of its effects on bovine ovarian granulosa cells is not clear. In the present study, we found that arachidonic acid plays an important role in regulating cell proliferation, lipid accumulation and steroidogenesis of granulosa cells. In this sense, arachidonic acid can directly affect the functionality of granulosa cells and therefore follicular development and ovulation, which could provide useful information for future studies relating to increasing fecundity of bovine. Abstract In the present study, AA was used to challenge bovine ovarian granulosa cells in vitro and the related parameters of cellular and molecular biology were measured. The results indicated that lower doses of AA increased survival of bovine granulosa cells whereas higher doses of AA suppressed survival. While lower doses of AA induced accumulation of lipid droplet in granulosa cells, the higher dose of AA inhibited lipid accumulation, and AA increased abundance of FABP3, CD36 and SLC27A1 mRNA. Higher doses of AA decreased the secretion of E2 and increased the secretion of P4 accompanied by down-regulation of the mRNA abundance of CYP19A1, FSHR, HSD3B1 and STAR in granulosa cells. The signaling pathways employed by AA in the stimulation of genes expression included both ERK1/2 and Akt. Together, AA specifically affects physiological features, gene expression levels and steroid hormone secretion, and thus altering the functionality of granulosa cells of cattle.
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Affiliation(s)
- Nina Zhang
- College of Animal Science and Technology, Northwest A & F University, Yangling, Xianyang 712100, Shaanxi, China.
| | - Liqiang Wang
- College of Animal Science and Technology, Northwest A & F University, Yangling, Xianyang 712100, Shaanxi, China.
| | - Guoya Luo
- College of Animal Science and Technology, Northwest A & F University, Yangling, Xianyang 712100, Shaanxi, China.
| | - Xiaorong Tang
- College of Animal Science and Technology, Northwest A & F University, Yangling, Xianyang 712100, Shaanxi, China.
| | - Lizhu Ma
- College of Animal Science and Technology, Northwest A & F University, Yangling, Xianyang 712100, Shaanxi, China.
| | - Yuxin Zheng
- College of Animal Science and Technology, Northwest A & F University, Yangling, Xianyang 712100, Shaanxi, China.
| | - Shujie Liu
- State Key Laboratory of Plateau Ecology and Agriculture, Key Laboratory of Plateau Grazing Animal Nutrition and Feed Science of Qinghai Province, Qinghai Plateau Yak Research Center, Qinhai University, Xining 810016, Qinghai, China.
| | - Christopher A Price
- Centre de recherche en reproduction fertility, Faculté de médecine vétérinaire, Université de Montréal, St-Hyacinthe, QC J2S 7C6, Canada.
| | - Zhongliang Jiang
- College of Animal Science and Technology, Northwest A & F University, Yangling, Xianyang 712100, Shaanxi, China.
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Kusama K, Yoshie M, Tamura K, Imakawa K, Tachikawa E. EPAC2-mediated calreticulin regulates LIF and COX2 expression in human endometrial glandular cells. J Mol Endocrinol 2015; 54:17-24. [PMID: 25378661 DOI: 10.1530/jme-14-0162] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The proper production of the implantation-related factors, leukemia inhibitory factor (LIF), cyclooxygenase 2 (COX2, PTGS2), and prostaglandin E2 (PGE2) in the uterine glands is essential for embryo implantation and the establishment of endometrial receptivity. It has been shown that cAMP-mediated protein kinase A (PKA) signaling regulates the production of these factors. We have previously reported that exchange protein directly activated by cAMP 2 (EPAC2, RAPGEF4), another cAMP mediator, is involved in the differentiation of endometrial stromal cells through the regulation of the expression of calreticulin (CALR). To address whether EPAC2-CALR signaling is involved in the expression of implantation-related factors, we examined the effect of EPAC2 and CALR knockdown on their expression in cultured human endometrial glandular epithelial EM1 cells, treated with forskolin, an adenylyl cyclase activator, an EPAC-selective cAMP analog (8-(4-chlorophenylthio)-2'-O-methyl cAMP (CPT)), or a PKA-selective cAMP analog (N(6)-phenyl-cAMP (Phe)). In addition, the status of cell senescence was examined. EPAC2 knockdown suppressed the expression of CALR protein and mRNA in EM1 cells. Forskolin- or Phe-, but not CPT-, induced expression of LIF or PTGS2 and secretion of PGE2 was inhibited in EPAC2- or CALR-silenced EM1 cells. In addition, knockdown of EPAC2 or CALR increased senescence-associated beta galactosidase activity and expression of p21 but decreased expression of p53. These findings indicate that expression of CALR regulated by EPAC2 in endometrial glandular epithelial cells is critical for the expression of LIF and PTGS2-mediated production of PGE2 through cAMP signaling. Furthermore, EPAC2 and CALR could play a role in the maintenance of gland function.
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Affiliation(s)
- Kazuya Kusama
- Department of Endocrine and Neural PharmacologyTokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, JapanLaboratory of Theriogenology and Animal BreedingGraduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan Department of Endocrine and Neural PharmacologyTokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, JapanLaboratory of Theriogenology and Animal BreedingGraduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Mikihiro Yoshie
- Department of Endocrine and Neural PharmacologyTokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, JapanLaboratory of Theriogenology and Animal BreedingGraduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Kazuhiro Tamura
- Department of Endocrine and Neural PharmacologyTokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, JapanLaboratory of Theriogenology and Animal BreedingGraduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Kazuhiko Imakawa
- Department of Endocrine and Neural PharmacologyTokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, JapanLaboratory of Theriogenology and Animal BreedingGraduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Eiichi Tachikawa
- Department of Endocrine and Neural PharmacologyTokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, JapanLaboratory of Theriogenology and Animal BreedingGraduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
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Isayama K, Chen H, Yamauchi N, Hattori MA. REV-ERBα inhibits the PTGS2 expression in bovine uterus endometrium stromal and epithelial cells exposed to ovarian steroids. J Reprod Dev 2014; 60:362-70. [PMID: 25007867 PMCID: PMC4219993 DOI: 10.1262/jrd.2014-040] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The nuclear receptor REV-ERBα (encoded by NR1D1) has a critical role in metabolism and physiology as well
as circadian rhythm. Here, we investigated the possible contribution of clock genes including NR1D1 to the
secretion of prostaglandin F2α (PGF2α) from bovine uterine stromal (USCs) and epithelial cells (UECs)
by modulating the expression of PTGS2. The circadian oscillation of clock genes in the cells was weak
compared with that reported in rodents, but the expression of BMAL1, PER1, and
NR1D1 was changed temporally by treatment with ovarian steroids. Significant expression of clock genes
including NR1D1 was detected in USCs exposed to progesterone. NR1D1 was also significantly
expressed in UECs exposed to estradiol. The expression of PTGS2 was suppressed in USCs exposed to
progesterone, while the expression was initially suppressed in UECs exposed to estradiol and then increased after long-term
exposure to estradiol. BMAL1 knockdown with specific siRNA caused a significant decrease in the transcript
levels of NR1D1 and PTGS2 in USCs, but not in UECs. The production of PGF2α also
decreased in USCs after BMAL1 knockdown, while its level did not significantly change in UECs. The
transcript level of PTGS2 was increased by treatment with the antagonist of REV-ERBα in both cell types, but
the agonist was ineffective. In these two cell types treated with the agonist or antagonist, the PGF2α production
coincided well with the PTGS2 expression. Collectively, these results indicate that REV-ERBα plays an
inhibitory role in the expression of PTGS2 in both bovine USCs and UECs treated with ovarian steroids.
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Affiliation(s)
- Keishiro Isayama
- Department of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, Fukuoka 812-8581, Japan
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Diverse roles of prostaglandins in blastocyst implantation. ScientificWorldJournal 2014; 2014:968141. [PMID: 24616654 PMCID: PMC3925584 DOI: 10.1155/2014/968141] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Accepted: 12/18/2013] [Indexed: 01/14/2023] Open
Abstract
Prostaglandins (PGs), derivatives of arachidonic acid, play an indispensable role in embryo implantation. PGs have been reported to participate in the increase in vascular permeability, stromal decidualization, blastocyst growth and development, leukocyte recruitment, embryo transport, trophoblast invasion, and extracellular matrix remodeling during implantation. Deranged PGs syntheses and actions will result in implantation failure. This review summarizes up-to-date literatures on the role of PGs in blastocyst implantation which could provide a broad perspective to guide further research in this field.
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Li HF, Yu X, Yang K, He CY, Kou SJ, Cao SX, Xie GR. The relationship between single nucleotide polymorphisms in 5-HT2A signal transduction-related genes and the response efficacy to selective serotonin reuptake inhibitor treatments in Chinese patients with major depressive disorder. Genet Test Mol Biomarkers 2012; 16:667-71. [PMID: 22480177 DOI: 10.1089/gtmb.2011.0232] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
OBJECTIVE To explore the possible relationship between six single nucleotide polymorphisms (SNPs) (rs6311 and rs6305 of 5-HT2A, rs5443 of Gβ3, rs2230739 of ACDY9, rs1549870 of PDE1A and rs255163 of CREB1, which are all related with 5-HT2A the signal transduction pathway) and the response efficacy to selective serotonin reuptake inhibitor (SSRI) treatments in major depressive disorder (MDD) Chinese. METHODS This study included 194 depressed patients to investigate the influence of 6 polymorphisms in 5-HT2A signal transduction-related genes on the efficacy of SSRIs assessed over 1 year. The efficacies of SSRIs on 194 MDD patients were evaluated in an 8-week open-trial study. Over 1 year, a follow-up study was completed for 174 of them to observe the long-term efficacy of SSRIs. The optimal-scaling regression analysis was used for testing the relationship between the different genotypes of five SNPs and the efficacy in MDD. RESULTS It showed that the patients with rs5443TT and rs2230739GG have a relatively good efficacy in response to short-term SSRIs. We also found that good efficacy appeared in depressed patients with rs2230739GG in response to long-term SSRIs. CONCLUSIONS It suggested that different genotypes of rs5443 and rs2230739 might influence the signal transduction pathways of second message and affect therapeutic efficacy.
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Affiliation(s)
- Heng-Fen Li
- Department of Psychiatry, the First Affiliated Hospital, Zhengzhou University, Zhengzhou, P.R. China
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Cheng Z, Elmes M, Kirkup S, Abayasekara DRE, Wathes DC. Effects of n-6 polyunsaturated fatty acids on prostaglandin production in ovine fetal chorion cells in vitro in late gestation ewes. Placenta 2011; 32:752-6. [PMID: 21794911 DOI: 10.1016/j.placenta.2011.06.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Revised: 06/28/2011] [Accepted: 06/30/2011] [Indexed: 10/17/2022]
Abstract
OBJECTIVE To use an in vitro model of the ovine placenta to determine effects of n-6 polyunsaturated fatty acid (PUFA) supplementation on prostaglandin (PG) production. PGs are key regulators of fetal maturation and parturition. STUDY DESIGN Fetal allantochorion tissue (FC) was collected in late pregnancy (day 135). FC cells were isolated and cultured with 0-100 μM of linoleic acid (LA), γ-linolenic acid (GLA) or arachidonic acid (AA) in serum free medium and challenged with control medium, lipopolysaccharide (LPS, 0.1 μg/ml), dexamethasone (DEX, 5 μM) or a combination of LPS (0.1 μg/ml) with DEX (5 μM). Spent medium was harvested at 2 h and 24 h post challenge for measuring PGs. MAIN OUTCOME MEASURES To assess the effects of treatment on placental 1- and 2-series PGE production. RESULTS LA supplementation inhibited both PGE(1) and PGE(2) production. GLA predominantly stimulated PGE(1) generation, although it also increased PGE(2) production. AA supplementation predominantly increased PGE(2) production, but also stimulated PGE(1). DEX treatment with or without LPS inhibited PG production. Supplementation with n-6 PUFAs attenuated or neutralised the stimulatory effect of LPS challenge on FC cells for both PGE(1) and PGE(2) production. CONCLUSION These data show that supplementation with n-6 PUFAs alters placental PG production, but their precise effects depend on their position in the biosynthetic pathway for PG synthesis. This study supports the possibility that GLA containing oils, widely promoted as dietary supplements, might reduce the risk of pre-term labour by inhibiting the responsiveness of PGE(2) production to LPS challenge in the placenta.
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Affiliation(s)
- Z Cheng
- Department of Veterinary Basic Sciences, Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield, Herts.,UK.
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Derecka K, Sheldrick EL, Wathes DC, Abayasekara DRE, Flint APF. A PPAR-independent pathway to PUFA-induced COX-2 expression. Mol Cell Endocrinol 2008; 287:65-71. [PMID: 18395968 DOI: 10.1016/j.mce.2008.02.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2007] [Revised: 02/15/2008] [Accepted: 02/16/2008] [Indexed: 11/29/2022]
Abstract
Polyunsaturated fatty acids (PUFAs) induce COX-2 in bovine endometrial stromal cells through activation of peroxisome-proliferator-activated receptor alpha (PPARalpha). We have investigated alternative (PPAR-independent) pathways to COX-2 induction using a reporter construct driven by a COX-2 gene promoter sequence lacking a PPAR response element. This construct was induced by PUFAs, but not by PPAR agonists. PPAR-independent reporter gene expression occurred 6h after PPAR-dependent induction of the endogenous COX-2 gene. In contrast to PPAR-dependent COX-2 induction, which is not affected by NF-kappaB inhibitors, the PPAR-independent pathway was blocked by the NF-kappaB inhibitor MG132 or following deletion of NF-kappaB sites in the COX-2 promoter. The PPAR-independent effect of PUFA was mimicked by the PKC activators 4beta-PMA and prostaglandin F(2alpha), but was not blocked by the PKC inhibitor RO318425. The results demonstrate a pathway to the induction of COX-2 by PUFAs requiring NF-kappaB but not PPAR or PKC.
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Affiliation(s)
- K Derecka
- Division of Animal Physiology, University of Nottingham, Sutton Bonington Campus, Loughborough, Leics LE12 5RD, UK
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