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Aguilera C, Velásquez AE, Gutierrez-Reinoso MA, Wong YS, Melo-Baez B, Cabezas J, Caamaño D, Navarrete F, Rojas D, Riadi G, Castro FO, Rodriguez-Alvarez L. Extracellular Vesicles Secreted by Pre-Hatching Bovine Embryos Produced In Vitro and In Vivo Alter the Expression of IFNtau-Stimulated Genes in Bovine Endometrial Cells. Int J Mol Sci 2023; 24:ijms24087438. [PMID: 37108601 PMCID: PMC10138918 DOI: 10.3390/ijms24087438] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 04/10/2023] [Accepted: 04/12/2023] [Indexed: 04/29/2023] Open
Abstract
The embryo-maternal interaction occurs during the early stages of embryo development and is essential for the implantation and full-term development of the embryo. In bovines, the secretion of interferon Tau (IFNT) during elongation is the main signal for pregnancy recognition, but its expression starts around the blastocyst stage. Embryos release extracellular vesicles (EVs) as an alternative mechanism of embryo-maternal communication. The aim of the study was to determine whether EVs secreted by bovine embryos during blastulation (D5-D7) could induce transcriptomic modifications, activating IFNT signaling in endometrial cells. Additionally, it aims to assess whether the EVs secreted by embryos produced in vivo (EVs-IVV) or in vitro (EVs-IVP) have different effects on the transcriptomic profiles of the endometrial cells. In vitro- and in vivo-produced bovine morulae were selected and individually cultured for 48 h to collect embryonic EVs (E-EVs) secreted during blastulation. E-EVs stained with PKH67 were added to in vitro-cultured bovine endometrial cells to assess EV internalization. The effect of EVs on the transcriptomic profile of endometrial cells was determined by RNA sequencing. EVs from both types of embryos induced several classical and non-classical IFNT-stimulated genes (ISGs) and other pathways related to endometrial function in epithelial endometrial cells. Higher numbers of differentially expressed genes (3552) were induced by EVs released by IVP embryos compared to EVs from IVV (1838). Gene ontology analysis showed that EVs-IVP/IVV induced the upregulation of the extracellular exosome pathway, the cellular response to stimulus, and the protein modification processes. This work provides evidence regarding the effect of embryo origin (in vivo or in vitro) on the early embryo-maternal interaction mediated by extracellular vesicles.
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Affiliation(s)
- Constanza Aguilera
- Laboratory of Animal Biotechnology, Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Av. Vicente Mendez 595, Chillan 3780000, Chile
| | - Alejandra Estela Velásquez
- Laboratory of Animal Biotechnology, Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Av. Vicente Mendez 595, Chillan 3780000, Chile
| | - Miguel Angel Gutierrez-Reinoso
- Laboratory of Animal Biotechnology, Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Av. Vicente Mendez 595, Chillan 3780000, Chile
| | - Yat Sen Wong
- Laboratory of Animal Biotechnology, Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Av. Vicente Mendez 595, Chillan 3780000, Chile
| | - Barbara Melo-Baez
- Laboratory of Animal Biotechnology, Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Av. Vicente Mendez 595, Chillan 3780000, Chile
| | - Joel Cabezas
- Laboratory of Animal Biotechnology, Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Av. Vicente Mendez 595, Chillan 3780000, Chile
| | - Diego Caamaño
- Laboratory of Animal Biotechnology, Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Av. Vicente Mendez 595, Chillan 3780000, Chile
| | - Felipe Navarrete
- Laboratory of Animal Biotechnology, Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Av. Vicente Mendez 595, Chillan 3780000, Chile
| | - Daniela Rojas
- Laboratory of Animal Biotechnology, Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Av. Vicente Mendez 595, Chillan 3780000, Chile
| | - Gonzalo Riadi
- ANID-Millennium Science Initiative Program Millennium Nucleus of Ion Channels-Associated Diseases (MiNICAD), Center for Bioinformatics, Simulation and Modeling, CBSM, Department of Bioinformatics, Faculty of Engineering, Campus Talca, University of Talca, Talca 3460000, Chile
| | - Fidel Ovidio Castro
- Laboratory of Animal Biotechnology, Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Av. Vicente Mendez 595, Chillan 3780000, Chile
| | - Llretny Rodriguez-Alvarez
- Laboratory of Animal Biotechnology, Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Av. Vicente Mendez 595, Chillan 3780000, Chile
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Akagi S, Matsukawa K. Effects of Trichostatin A on the Timing of the First Cleavage and In Vitro Developmental Potential of Bovine Somatic Cell Nuclear Transfer Embryos. Cell Reprogram 2022; 24:142-149. [PMID: 35404091 DOI: 10.1089/cell.2022.0003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
This study examined the relationship between the timing of the first cleavage and in vitro development of bovine somatic cell nuclear transfer (SCNT) embryos treated with trichostatin A (TSA). SCNT embryos were visually assessed at 22, 26, and 48 hours after activation. Each embryo with two or more distinct blastomeres was transferred into a microwell and cultured until day 7. Irrespective of TSA treatment, approximately half of the cleaved embryos were observed at 22 hours, and a significantly higher blastocyst formation rate was shown in the SCNT embryos cleaved at 22 hours than those cleaved at ≥26 hours. The blastocyst formation rate of TSA-treated embryos cleaved at 22 hours (80%) was slightly higher than that of the control embryos (70%). In addition, interferon-τ (IFN-τ) expression was significantly lower in control SCNT embryos and late-cleaving (>26 hours) TSA-treated embryos than in in vitro fertilized (IVF) embryos. However, a significant difference was not observed between TSA-treated SCNT embryos cleaved at 22 and 26 hours, and IVF embryos. These results suggest that TSA treatment has no influence on the timing of the first cleavage of SCNT embryos; however, it slightly improves the blastocyst formation rate and the expression level of IFN-τ in early-cleaving embryos.
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Affiliation(s)
- Satoshi Akagi
- Division of Dairy Cattle Feeding and Breeding Research, Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization (NARO), Tsukuba, Japan
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Guo R, Chen F, Mei C, Dai Z, Yan L, Shi Z. Conception Rate and Reproductive Hormone Secretion in Holstein Cows Immunized against Inhibin and Subjected to the Ovsynch Protocol. Animals (Basel) 2020; 10:ani10020313. [PMID: 32079231 PMCID: PMC7070342 DOI: 10.3390/ani10020313] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Accepted: 01/29/2020] [Indexed: 01/26/2023] Open
Abstract
Simple Summary In recent decades, conception rates in lactating dairy cows have dramatically decreased, and improving the conception rate has become a major challenge in dairy cow reproduction. Various Ovsynch protocols have been developed to aid in the resumption of ovarian follicular activity for timely breeding in post-partum cows. However, the effect of Ovsynch protocols on improving the conception rate is unsatisfactory. In addition, immunization against inhibin was reported to improve the fertility of domestic animals. Thus, a novel reproductive technique combining immunization against inhibin and the widely used Ovsynch protocol was proposed and tested in this study. Our results showed that immunization against inhibin has the potential to improve conception rates in cows, but also compromised luteal function. According to these results, additional luteal-stimulating treatments are suggested to further improve cow fertility based on immunization and the Ovsynch protocol. Abstract This study was conducted to investigate the feasibility of improving fertility in dairy cows via immunization against inhibin. Thirty-two cows were divided into Control (n = 11), Low-dose (n = 10) and High-dose (n = 11) groups. The High-dose and Low-dose cows were treated with 1 and 0.5 mg of the inhibin immunogen, respectively. All the cows were subjected to the Ovsynch protocol from the day of antigen administration and were artificially inseminated. Blood samples were serially collected over a 24-day period from the start of the Ovsynch protocol to 14 days after insemination. The results showed that immunization against inhibin dose-dependently increased the plasma concentrations of follicle-stimulating hormone (FSH), estradiol (E2), and activin A, but decreased progesterone (P4) concentrations in the luteal phase. Immunization also increased the plasma interferon (IFN)-τ concentrations in pregnant cows on day 14 after initial insemination. The conception rates in High-dose (45.5%) and Low-dose (40%) cows marginally increased compared to that in Control cows (27.3%), but the increases were not significant (p > 0.05). In conclusion, a single immunization against inhibin has the potential to improve conception rates, despite impaired luteal development. To further improve the reproductive performance of dairy cows, additional luteal-stimulating treatments are suggested in combination with immunization against inhibin and Ovsynch techniques.
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Affiliation(s)
- Rihong Guo
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (R.G.); (F.C.)
| | - Fang Chen
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (R.G.); (F.C.)
| | - Cheng Mei
- Dongying Austasia Modern Dairy Farm Co., Ltd., Dongying 257345, China;
| | - Zicun Dai
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (R.G.); (F.C.)
| | - Leyan Yan
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (R.G.); (F.C.)
| | - Zhendan Shi
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (R.G.); (F.C.)
- Correspondence:
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Challenges in studying preimplantation embryo-maternal interaction in cattle. Theriogenology 2020; 150:139-149. [PMID: 31973965 DOI: 10.1016/j.theriogenology.2020.01.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Accepted: 01/11/2020] [Indexed: 01/10/2023]
Abstract
A comprehensive understanding of the complex embryo-maternal interactions during the preimplantation period requires the analysis of the very early stages of pregnancy encompassing early embryonic development, maternal recognition and the events leading to implantation. Despite the fact that embryo development until blastocyst stage is somewhat autonomous (i.e., does not require contact with the maternal reproductive tract and can be successfully recapitulated in vitro), many studies on ruminant embryo production have focused on the fundamental question of why: (i) only 30%-40% of immature oocytes develop to the blastocyst stage and (ii) the quality of such blastocysts continually lags behind that of blastocysts produced in vivo. Clear evidence indicates that in vitro culture conditions are far from optimal with deficiencies being manifested in short- and long-term effects on the embryo. Thus, enhanced knowledge of mechanisms controlling embryo-maternal interactions would allow the design of novel strategies to improve in vitro embryo conditions and reproductive outcomes in cattle.
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Madeja ZE, Warzych E, Pawlak P, Lechniak D. Inhibitor mediated WNT and MEK/ERK signalling affects apoptosis and the expression of quality related genes in bovine in vitro obtained blastocysts. Biochem Biophys Res Commun 2019; 510:403-408. [PMID: 30711254 DOI: 10.1016/j.bbrc.2019.01.113] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 01/25/2019] [Indexed: 01/05/2023]
Abstract
Culture conditions determine embryo quality, which may be affected on many levels (timing of development, blastomere count, transcripts, metabolite content, apoptosis). Molecular interactions of signalling pathways like MEK/ERK and WNT/β-catenin are critical for cell-to-cell communication and cellular differentiation. Both pathways are important regulators of apoptosis. We have aimed to verify the prolonged effect of MEK/ERK silencing and WNT activation by chemical inhibitors (2i or 3i systems) on bovine IVP embryos. Apoptotic index, total cell count and transcription of embryo quality markers were evaluated. A higher rate of apoptosis was observed in 2i blastocysts, but was not accompanied by changes in transcript content of genes controlling apoptosis (BAX, BCL2, BAK, BAX/BCL2 ratio). Therefore, alternative pathways of apoptotic activation cannot be ruled out. The expression of genes related to embryo quality (HSPA1A, SLC2A1) was not affected. GJA1 transcripts were significantly higher in 3i blastocysts, what indicates a stimulatory effect of the applied inhibitors on cell-to-cell interactions. The lowest mRNA level of the IFNT2 gene was found in 2i embryos. A variation in the SDHA gene transcript was observed (with the highest content in the 3i blastocysts), what may suggest their reduced quality. It may be concluded that the modifications of culture conditions (activation of the WNT and silencing of the MEK/ERK signalling) might alter pathways crucial for embryo development without causing embryonic death.
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Affiliation(s)
- Zofia E Madeja
- Department of Genetics and Animal Breeding, Faculty of Veterinary Medicine and Animal Sciences, Poznan University of Life Sciences, Wołyńska 33, 60-637, Poznań, Poland.
| | - Ewelina Warzych
- Department of Genetics and Animal Breeding, Faculty of Veterinary Medicine and Animal Sciences, Poznan University of Life Sciences, Wołyńska 33, 60-637, Poznań, Poland.
| | - Piotr Pawlak
- Department of Genetics and Animal Breeding, Faculty of Veterinary Medicine and Animal Sciences, Poznan University of Life Sciences, Wołyńska 33, 60-637, Poznań, Poland.
| | - Dorota Lechniak
- Department of Genetics and Animal Breeding, Faculty of Veterinary Medicine and Animal Sciences, Poznan University of Life Sciences, Wołyńska 33, 60-637, Poznań, Poland.
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6
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Passaro C, Tutt D, Mathew DJ, Sanchez JM, Browne JA, Boe-Hansen GB, Fair T, Lonergan P. Blastocyst-induced changes in the bovine endometrial transcriptome. Reproduction 2018; 156:219-229. [PMID: 30021913 DOI: 10.1530/rep-18-0188] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 06/12/2018] [Indexed: 12/12/2022]
Abstract
The objectives of this study were (i) to determine whether blastocyst-induced responses in endometrial explants were detectable after 6- or 24-h co-culture in vitro; (ii) to test if direct contact is required between embryos and the endometrial surface in order to stimulate endometrial gene expression; (iii) to establish the number of blastocysts required to elicit a detectable endometrial response; (iv) to investigate if upregulation of five interferon-stimulated genes (ISGs) in the endometrium was specific to the blastocyst stage and (v) to test if alterations in endometrial gene expression can be induced by blastocyst-conditioned medium. Exposure of endometrial explants to Day 8 blastocysts in vitro for 6 or 24 h induced the expression of ISGs (MX1, MX2, OAS1, ISG15, RSAD2); expression of IFNAR1, IFNAR2, NFKB1, IL1B, STAT1, LGALS3BP, LGALS9, HPGD, PTGES, ITGB1, AKR1C4, AMD1 and AQP4 was not affected. Culture of explants in the presence of more than five blastocysts was sufficient to induce the effect, with maximum expression of ISGs occurring in the presence of 20 blastocysts. This effect was exclusive to blastocyst stage embryos; oocytes, 2-cell embryos or Day 5 morulae did not alter the relative abundance of any of the transcripts examined. Direct contact between blastocysts and the endometrial surface was not required in order to alter the abundance of these transcripts and blastocyst-conditioned medium alone was sufficient to stimulate a response. Results support the notion that local embryo-maternal interaction may occur as early as Day 8 of pregnancy in cattle.
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Affiliation(s)
- C Passaro
- School of Agriculture and Food Science, University College Dublin, Belfield, Dublin, Ireland
| | - D Tutt
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - D J Mathew
- Division of Animal and Nutritional Sciences, West Virginia University, Morgantown, West Virginia, USA
| | - J M Sanchez
- School of Agriculture and Food Science, University College Dublin, Belfield, Dublin, Ireland
| | - J A Browne
- School of Agriculture and Food Science, University College Dublin, Belfield, Dublin, Ireland
| | - G B Boe-Hansen
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - T Fair
- School of Agriculture and Food Science, University College Dublin, Belfield, Dublin, Ireland
| | - P Lonergan
- School of Agriculture and Food Science, University College Dublin, Belfield, Dublin, Ireland
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7
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Forde N, Lonergan P. Interferon-tau and fertility in ruminants. Reproduction 2017; 154:F33-F43. [DOI: 10.1530/rep-17-0432] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 09/04/2017] [Accepted: 09/08/2017] [Indexed: 01/06/2023]
Abstract
Establishment of pregnancy in domestic ruminants includes pregnancy recognition signalling by the conceptus, implantation and placentation. Despite the high fertilisation success rate in ruminants, a significant amount of embryo loss occurs, primarily during early gestation. Interferon-tau (IFNT), a type I interferon that is exclusively secreted by the cells of the trophectoderm of the ruminant conceptus, has been recognised as the primary agent for maternal recognition of pregnancy in ruminants. It produces its antiluteolytic effect on the corpus luteum by inhibiting the expression of oxytocin receptors in the uterine epithelial cells, which prevents pulsatile, luteolytic secretion of prostaglandin F2α by the uterine endometrium. While the importance of IFNT in maternal recognition of pregnancy and prevention of luteolysis in ruminants is unequivocal, important questions, for example, relating to the threshold level of IFNT required for pregnancy maintenance, remain unanswered. This paper reviews data linking IFNT with measures of fertility in ruminants.
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Green MP, Harvey AJ, Spate LD, Kimura K, Thompson JG, Roberts RM. The effects of 2,4-dinitrophenol and d
-glucose concentration on the development, sex ratio, and interferon-tau (IFNT) production of bovine blastocysts. Mol Reprod Dev 2015; 83:50-60. [DOI: 10.1002/mrd.22590] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 10/12/2015] [Indexed: 12/12/2022]
Affiliation(s)
- Mark P. Green
- Division of Animal Sciences; University of Missouri, Columbia; Missouri
| | - Alexandra J. Harvey
- School of BioSciences, University of Melbourne, Parkville; Melbourne Australia
| | - Lee D. Spate
- Division of Animal Sciences; University of Missouri, Columbia; Missouri
| | - Koji Kimura
- Division of Animal Sciences; University of Missouri, Columbia; Missouri
- Reproductive Physiology Laboratory, National Institute of Livestock and Grassland Science; 768 Senbonmatsu Nishinasuno Tochigi Japan
| | - Jeremy G. Thompson
- Robinson Research Institute, University of Adelaide and ARC Centre of Excellence for Nanoscale BioPhotonics; Adelaide Australia
| | - R. Michael Roberts
- Division of Animal Sciences; University of Missouri, Columbia; Missouri
- 240b Christopher S. Bond Life Sciences Center, Columbia; Missouri
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Mohapatra SK, Sandhu A, Singh KP, Singla SK, Chauhan MS, Manik R, Palta P. Establishment of Trophectoderm Cell Lines from Buffalo (Bubalus bubalis) Embryos of Different Sources and Examination of In Vitro Developmental Competence, Quality, Epigenetic Status and Gene Expression in Cloned Embryos Derived from Them. PLoS One 2015; 10:e0129235. [PMID: 26053554 PMCID: PMC4459972 DOI: 10.1371/journal.pone.0129235] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Accepted: 05/06/2015] [Indexed: 11/26/2022] Open
Abstract
Despite being successfully used to produce live offspring in many species, somatic cell nuclear transfer (NT) has had a limited applicability due to very low (>1%) live birth rate because of a high incidence of pregnancy failure, which is mainly due to placental dysfunction. Since this may be due to abnormalities in the trophectoderm (TE) cell lineage, TE cells can be a model to understand the placental growth disorders seen after NT. We isolated and characterized buffalo TE cells from blastocysts produced by in vitro fertilization (TE-IVF) and Hand-made cloning (TE-HMC), and compared their growth characteristics and gene expression, and developed a feeder-free culture system for their long-term culture. The TE-IVF cells were then used as donor cells to produce HMC embryos following which their developmental competence, quality, epigenetic status and gene expression were compared with those of HMC embryos produced using fetal or adult fibroblasts as donor cells. We found that although TE-HMC and TE-IVF cells have a similar capability to grow in culture, significant differences exist in gene expression levels between them and between IVF and HMC embryos from which they are derived, which may have a role in the placental abnormalities associated with NT pregnancies. Although TE cells can be used as donor cells for producing HMC blastocysts, their developmental competence and quality is lower than that of blastocysts produced from fetal or adult fibroblasts. The epigenetic status and expression level of many important genes is different in HMC blastocysts produced using TE cells or fetal or adult fibroblasts or those produced by IVF.
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Affiliation(s)
| | - Anjit Sandhu
- Animal Biotechnology Centre, National Dairy Research Institute, Karnal, India
| | - Karn Pratap Singh
- Animal Biotechnology Centre, National Dairy Research Institute, Karnal, India
| | - Suresh Kumar Singla
- Animal Biotechnology Centre, National Dairy Research Institute, Karnal, India
| | | | - Radheysham Manik
- Animal Biotechnology Centre, National Dairy Research Institute, Karnal, India
| | - Prabhat Palta
- Animal Biotechnology Centre, National Dairy Research Institute, Karnal, India
- * E-mail:
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Splitting of IVP bovine blastocyst affects morphology and gene expression of resulting demi-embryos during in vitro culture and in vivo elongation. ZYGOTE 2014; 24:18-30. [PMID: 25496989 DOI: 10.1017/s0967199414000677] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Embryo splitting might be used to increase offspring yield and for molecular analysis of embryo competence. How splitting affects developmental potential of embryos is unknown. This research aimed to study the effect of bovine blastocyst splitting on morphological and gene expression homogeneity of demi-embryos and on embryo competence during elongation. Grade I bovine blastocyst produced in vitro were split into halves and distributed in nine groups (3 × 3 setting according to age and stage before splitting; age: days 7-9; stage: early, expanded and hatched blastocysts). Homogeneity and survival rate in vitro after splitting (12 h, days 10 and 13) and the effect of splitting on embryo development at elongation after embryo transfer (day 17) were assessed morphologically and by RT-qPCR. The genes analysed were OCT4, SOX2, NANOG, CDX2, TP1, TKDP1, EOMES, and BAX. Approximately 90% of split embryos had a well conserved defined inner cell mass (ICM), 70% of the halves had similar size with no differences in gene expression 12 h after splitting. Split embryos cultured further conserved normal and comparable morphology at day 10 of development; this situation changes at day 13 when embryo morphology and gene expression differed markedly among demi-embryos. Split and non-split blastocysts were transferred to recipient cows and were recovered at day 17. Fifty per cent of non-split embryos were larger than 100 mm (33% for split embryos). OCT4, SOX2, TP1 and EOMES levels were down-regulated in elongated embryos derived from split blastocysts. In conclusion, splitting day-8 blastocysts yields homogenous demi-embryos in terms of developmental capability and gene expression, but the initiation of the filamentous stage seems to be affected by the splitting.
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Arias ME, Risopatrón J, Sánchez R, Felmer R. Intracytoplasmic sperm injection affects embryo developmental potential and gene expression in cattle. Reprod Biol 2014; 15:34-41. [PMID: 25726375 DOI: 10.1016/j.repbio.2014.11.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2013] [Revised: 10/06/2014] [Accepted: 11/02/2014] [Indexed: 01/25/2023]
Abstract
Some reports have linked intracytoplasmic sperm injection (ICSI) with chromosomal abnormalities, low developmental potential and altered gene expression in embryos. ICSI has also been linked with obesity, early aging and increased incidence of tumors in offspring. Other reports have demonstrated that some of these complications disappeared within a few weeks of life or even showed a lack of such associations. The aim of this study was to evaluate and compare embryo development, quality and gene expression in bovine embryos generated by ICSI and by conventional in vitro fertilization (IVF) insemination. The results showed differences in cleavage (88.5% in IVF and 64.1% in ICSI) and blastocyst formation rates (36.1% in IVF and 22.3% in ICSI). The proportion of ICM cells to total cell count was higher in ICSI (39.2%) than in IVF embryos (29.5%). However, no differences were observed in the total embryonic cell numbers (159.3±28.5 and 161.2±56.2 for IVF and ICSI, respectively) or in the proportion of apoptotic nuclei to the total embryonic cell numbers (2.12 and 2.64% for IVF and ICSI, respectively). Gene expression analysis showed a down-regulation of insulin-like growth factor 2 (IGF2) and overexpression of bcl-2-like protein 4 (BAX), octamer-binding transcription factor four (OCT4), interferon-tau (IFNt), Mn-superoxide dismutase in the mitochondria (SOD2), and catalase (CAT) in embryos generated by ICSI. In conclusion, our study demonstrated differences in the morphological development of bovine embryos as well as in the expression of genes involved in early development between ICSI and IVF embryos. The results may indicate lower developmental potential of ICSI embryos compared with that of IVF.
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Affiliation(s)
- María Elena Arias
- Laboratory of Reproduction, Centre of Reproductive Biotechnology (CEBIOR-BIOREN), Faculty of Medicine, Universidad de La Frontera, Temuco, Chile
| | - Jennie Risopatrón
- Laboratory of Reproduction, Centre of Reproductive Biotechnology (CEBIOR-BIOREN), Faculty of Medicine, Universidad de La Frontera, Temuco, Chile
| | - Raúl Sánchez
- Laboratory of Reproduction, Centre of Reproductive Biotechnology (CEBIOR-BIOREN), Faculty of Medicine, Universidad de La Frontera, Temuco, Chile
| | - Ricardo Felmer
- Laboratory of Reproduction, Centre of Reproductive Biotechnology (CEBIOR-BIOREN), Faculty of Medicine, Universidad de La Frontera, Temuco, Chile; Department of Agricultural Sciences and Natural Resources, Faculty of Agriculture and Forestry, Universidad de La Frontera, Temuco, Chile.
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Imakawa K, Yasuda J, Kobayashi T, Miyazawa T. Changes in Gene Expression Associated with Conceptus Implantation to the Maternal Endometrium. ACTA ACUST UNITED AC 2013. [DOI: 10.1274/jmor.30.2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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13
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Effects of ghrelin on developmental competence and gene expression of in vitro fertilized ovine embryos. Theriogenology 2013; 79:695-701. [DOI: 10.1016/j.theriogenology.2012.11.026] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2012] [Revised: 11/20/2012] [Accepted: 11/24/2012] [Indexed: 01/03/2023]
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14
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Mori M, Kasa S, Hattori MA, Ueda S. Development of a single bovine embryo improved by co-culture with trophoblastic vesicles in vitamin-supplemented medium. J Reprod Dev 2012; 58:717-21. [PMID: 22878867 DOI: 10.1262/jrd.2012-085] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
To improve the development of singly cultured bovine embryos, we developed a co-culture method with trophoblastic vesicles. The growth of trophoblastic cells was markedly increased in vitamin-supplemented medium 199 compared with medium 199. Upon co-culture of a single embryo with trophoblastic vesicles in vitamin-supplemented medium 199, embryo development to the blastocyst stage was significantly higher than in embryos co-cultured with trophoblastic vesicles in RPMI 1640 or with cumulus cells in medium 199 (control). In the absence of the vitamin cocktail, co-culture with trophoblastic vesicles in medium 199 did not improve embryo development compared with that of the control. The vitamin cocktail was effective in embryo development when co-cultured with trophoblastic vesicles, but not with cumulus cells. Embryo development was not improved in the absence of co-cultured trophoblastic vesicles, even in the presence of vitamin cocktail. In conclusion, the co-culture system with trophoblastic vesicles in vitamin-supplemented medium 199 efficiently enhances the development of singly cultured embryos.
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Affiliation(s)
- Miyuki Mori
- Fukuoka Agricultural Research Center, Fukuoka 818-8549, Japan.
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15
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Groebner AE, Zakhartchenko V, Bauersachs S, Rubio-Aliaga I, Daniel H, Büttner M, Reichenbach HD, Meyer HHD, Wolf E, Ulbrich SE. Reduced amino acids in the bovine uterine lumen of cloned versus in vitro fertilized pregnancies prior to implantation. Cell Reprogram 2011; 13:403-10. [PMID: 21774685 DOI: 10.1089/cell.2011.0006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Fetal overgrowth and placental abnormalities frequently occur in pregnancies following somatic cell nuclear transfer (SCNT). An optimal intrauterine supply of amino acids (AA) is of specific importance for the development of the bovine preimplantation embryo, and a defective regulation of AA supply might contribute to pregnancy failures. Thus, we analyzed 41 AA and derivatives by liquid chromatography-tandem mass spectrometry in uterine flushings of day 18 pregnant heifers carrying in vitro fertilized (IVF) or SCNT embryos, which were cultured under identical conditions until transfer to recipients. The concentrations of several AA were reduced in samples from SCNT pregnancies: L-leucine (1.8-fold), L-valine (1.6-fold), L-isoleucine (1.9-fold), L-phenylalanine (1.5-fold), L-glutamic acid (3.9-fold), L-aspartic acid (4.0-fold), L-proline (2.6-fold), L-alanine (2.0-fold), L-arginine (2.5-fold), and L-lysine (1.9-fold). The endometrial transcript abundance for the AA transporter solute carrier family 7 (amino acid transporter, L-type), member 8 (SLC7A8) was also 2.4-fold lower in SCNT pregnancies. O-phosphoethanolamine (PetN) was 11-fold (p=0.0001) reduced in the uterine fluid of animals carrying an SCNT conceptus, pointing toward changes of the phospholipid metabolism. We provide evidence for disturbed embryo-maternal interactions in the preimplantation period after transfer of SCNT embryos, which may contribute to developmental abnormalities. These are unlikely related to the major embryonic pregnancy recognition signal interferon-tau, because similar activities were detected in uterine flushings of the SCNT and IVF groups.
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Affiliation(s)
- Anna E Groebner
- Physiology Weihenstephan, Technische Universitaet Muenchen, Freising, Germany
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16
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Ulbrich SE, Meyer SU, Zitta K, Hiendleder S, Sinowatz F, Bauersachs S, Büttner M, Fröhlich T, Arnold GJ, Reichenbach HD, Wolf E, Meyer HHD. Bovine endometrial metallopeptidases MMP14 and MMP2 and the metallopeptidase inhibitor TIMP2 participate in maternal preparation of pregnancy. Mol Cell Endocrinol 2011; 332:48-57. [PMID: 20887771 DOI: 10.1016/j.mce.2010.09.009] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2009] [Revised: 09/18/2010] [Accepted: 09/21/2010] [Indexed: 01/08/2023]
Abstract
Early embryonic development is critically dependent on both maternal preparation and embryonic signalling of pregnancy. Matrix metallopeptidases (MMP) contribute to spatial and temporal matrix remodeling in the bovine endometrium. In this study we observed distinct changes in expression of MMP2, MMP14, and the metallopeptidase inhibitor TIMP2 between different phases of the estrous cycle indicating an endocrine regulation. An increase of TIMP2 protein abundance was ascertained in the uterine lumen during the time of embryo elongation. The expression pattern and cellular localization correlate well with the assumed effects of MMPs on release and activation of cytokines and growth factors directing cell migration, differentiation, and vascularization during this pivotal period of development. Specifically, active MMP2 in the endometrium may determine the allocation of growth factors supporting conceptus development. The presence of a day 18 conceptus in vivo and day 8 blastoysts in vitro induced endometrial TIMP2 mRNA expression. The results imply that TIMP2 is involved in very early local maternal recognition of pregnancy. Matrix metallopeptidases are likely to participate in remodeling processes preparing a receptive endometrium for a timely and precise regulation of embryo development.
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Affiliation(s)
- Susanne E Ulbrich
- Physiology Weihenstephan, Technical University Munich, Weihenstephaner Berg 3, 85354 Freising, Germany.
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17
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Bebbere D, Bogliolo L, Ariu F, Fois S, Leoni GG, Succu S, Berlinguer F, Ledda S. Different temporal gene expression patterns for ovine pre-implantation embryos produced by parthenogenesis or in vitro fertilization. Theriogenology 2010; 74:712-23. [DOI: 10.1016/j.theriogenology.2010.03.024] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2009] [Revised: 03/23/2010] [Accepted: 03/25/2010] [Indexed: 10/19/2022]
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18
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Endoscopic approaches to manage in vitro and in vivo embryo development: Use of the bovine oviduct. Theriogenology 2010; 73:768-76. [DOI: 10.1016/j.theriogenology.2009.07.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2009] [Accepted: 05/18/2009] [Indexed: 11/18/2022]
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19
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Yao N, Wan PC, Hao ZD, Gao FF, Yang L, Cui MS, Wu Y, Liu JH, Liu S, Chen H, Zeng SM. Expression of Interferon-tau mRNA in Bovine Embryos Derived from Different Procedures. Reprod Domest Anim 2009; 44:132-9. [DOI: 10.1111/j.1439-0531.2007.01009.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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Green MP, Spate LD, Parks TE, Kimura K, Murphy CN, Williams JE, Kerley MS, Green JA, Keisler DH, Roberts RM. Nutritional skewing of conceptus sex in sheep: effects of a maternal diet enriched in rumen-protected polyunsaturated fatty acids (PUFA). Reprod Biol Endocrinol 2008; 6:21. [PMID: 18541015 PMCID: PMC2432061 DOI: 10.1186/1477-7827-6-21] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2008] [Accepted: 06/09/2008] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Evolutionary theory suggests that in polygynous mammalian species females in better body condition should produce more sons than daughters. Few controlled studies have however tested this hypothesis and controversy exists as to whether body condition score or maternal diet is in fact the determining factor of offspring sex. Here, we examined whether maternal diet, specifically increased n-6 polyunsaturated fatty acid (PUFA) intake, of ewes with a constant body condition score around the time of conception influenced sex ratio. METHODS Ewes (n = 44) maintained in similar body condition throughout the study were assigned either a control (C) diet or one (F) enriched in rumen-protected PUFA, but otherwise essentially equivalent, from four weeks prior to breeding until d13 post-estrus. On d13, conceptuses were recovered, measured, cultured to assess their capacity for interferon-tau (IFNT) production and their sex determined. The experiment was repeated with all ewes being fed the F diet to remove any effects of parity order on sex ratio. Maternal body condition score (BCS), plasma hormone and metabolite concentrations were also assessed throughout the study and related to diet. RESULTS In total 129 conceptuses were recovered. Ewes on the F diet produced significantly more male than female conceptuses (proportion male = 0.69; deviation from expected ratio of 0.5, P < 0.001). Conceptus IFNT production was unaffected by diet (P > 0.1), but positively correlated with maternal body condition score (P < 0.05), and was higher (P < 0.05) in female than male conceptuses after 4 h culture. Maternal plasma hormone and metabolite concentrations, especially progesterone and fatty acid, were also modulated by diet. CONCLUSION These results provide evidence that maternal diet, in the form of increased amounts of rumen-protected PUFA fed around conception, rather than maternal body condition, can skew the sex ratio towards males. These observations may have implications to the livestock industry and animal management policies when offspring of one sex may be preferred over the other.
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Affiliation(s)
- Mark P Green
- Division of Animal Sciences, University of Missouri, Columbia MO 65211, USA
- AgResearch Ltd., Ruakura Research Centre, Hamilton 3240, New Zealand
| | - Lee D Spate
- Division of Animal Sciences, University of Missouri, Columbia MO 65211, USA
| | - Tina E Parks
- Division of Animal Sciences, University of Missouri, Columbia MO 65211, USA
| | - Koji Kimura
- Division of Animal Sciences, University of Missouri, Columbia MO 65211, USA
- National Institute of Livestock and Grassland Science, Reproductive Physiology Lab., Tochigi 329-2793, Japan
| | - Clifton N Murphy
- Division of Animal Sciences, University of Missouri, Columbia MO 65211, USA
| | - Jim E Williams
- Division of Animal Sciences, University of Missouri, Columbia MO 65211, USA
| | - Monty S Kerley
- Division of Animal Sciences, University of Missouri, Columbia MO 65211, USA
| | - Jonathan A Green
- Division of Animal Sciences, University of Missouri, Columbia MO 65211, USA
| | - Duane H Keisler
- Division of Animal Sciences, University of Missouri, Columbia MO 65211, USA
| | - R Michael Roberts
- Division of Animal Sciences, University of Missouri, Columbia MO 65211, USA
- Christopher S. Bond Life Sciences Center, University of Missouri, Columbia MO 65211, USA
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21
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Talbot NC, Powell AM, Ocón OM, Caperna TJ, Camp M, Garrett WM, Ealy AD. Comparison of the interferon-tau expression from primary trophectoderm outgrowths derived from IVP, NT, and parthenogenote bovine blastocysts. Mol Reprod Dev 2008; 75:299-308. [PMID: 17721989 DOI: 10.1002/mrd.20741] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The expression of interferon-tau (IFN-tau) is essential for bovine embryo survival in the uterus. An evaluation of IFN-tau production from somatic cell nuclear transfer (NT)-embryo-derived primary trophectoderm cultures in comparison to trophectoderm cultured from parthenogenote (P) and in vitro matured, fertilized, and cultured (IVP) bovine embryos was performed. In Experiment 1, the success/failure ratio for primary trophectoderm colony formation was similar for IVP and NT blastocysts [IVP = 155/29 (84%); NT 104/25 (81%)], but was decreased (P = .05) for P blastocysts [54/43 (56%)]. Most trophectoderm colonies reached diameters of at least 1 cm within 3-4 weeks, and at this time, 72 hr conditioned cell culture medium was measured for IFN-tau concentration by antiviral activity assay. The amount of IFN-tau produced by IVP-outgrowths [4311 IU/mL (n = 155)] was greater (P < .05) than that from NT- [626 IU/mL (n = 104)] and P - [1595 IU/mL (n = 54)] derived trophectoderm. Differential expression of IFN-tau was confirmed by immunoblotting. In Experiment 2, colony formation was again similar for IVP and NT blastocysts [IVP = 70/5 (93%); NT 67/1 (99%)] and less (P < .05) for P blastocysts [65/27 (70%)]. Analysis of trophectoderm colony size after 23 days in culture showed a similar relationship with P-derived colonies being significantly smaller in comparison to IVP and NT colonies. A differential expression of IFN-tau was also observed again, but this time as measured over time in culture. Maximal IFN-tau production was found at day-14 of primary culture and diminished to a minimum by the 23rd day.
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Affiliation(s)
- Neil C Talbot
- USDA, ARS, ANRI, Biotechnology and Germplasm Laboratory, Beltsville, Maryland 20705-2350, USA.
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22
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Abstract
Bovine in vitro embryo production is an inefficient process; while maturation and fertilization proceed apparently normally, the proportion of embryos reaching the transferable (blastocyst) stage is rarely over 40% and those that do reach this stage are often compromised in quality and competence. There is considerable evidence of a significant influence of follicular origin on oocyte developmental potential and it appears that once the oocyte is removed from the follicle its developmental capacity is capped. Evidence suggests that while culture conditions during bovine in vitro embryo production can impact somewhat the developmental potential of the early embryo, the intrinsic quality of the oocyte is the key factor determining the proportion of oocytes developing to the blastocyst stage. This paper highlights some of the problems associated with in vitro production of embryos and discusses some of the ways of overcoming these problems.
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23
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Kubisch HM, Johnson KM. The Effects of Blastomere Biopsy and Oxygen Tension on Bovine Embryo Development, Rate of Apoptosis and Interferon-? Secretion. Reprod Domest Anim 2007; 42:509-15. [PMID: 17845607 DOI: 10.1111/j.1439-0531.2006.00814.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
A series of experiments was performed to examine the effects of blastomere biopsies on subsequent development of IVF-derived bovine embryos. The first experiment was designed to assess the optimal time for blastomere removal. One blastomere was removed either 48 or 72 h after IVF. Biopsy at 48 h resulted in 17.2% of embryos proceeding to the blastocyst stage, which was lower than when biopsies were performed at 72 h (37.5%, p < 0.05). In the second experiment, embryos were cultured either under atmospheric or 5% O(2) following blastomere removal. Biopsies had no effect on rate of blastocyst formation with 36% of controls and 33.7% of biopsied embryos proceeding to that stage. However, culture under 5% O(2) significantly increased the number of blastocysts from 29.9% to 40.3% (p < 0.05). This effect was significant in both biopsied and control embryos. In the final experiment, biopsied embryos were again cultured under different oxygen tension. Blastocysts were collected and cultured individually for 48 h in medium droplets in their respective O(2) concentration after which time the medium was assayed for concentration of interferon-tau (IFN-tau). Reduced O(2) concentration again significantly increased blastocyst formation from 24.9% to 41.9% (p < 0.05). IFN-tau secretion was not affected by biopsies, but culture under atmospheric O(2) resulted in significantly increased IFN-tau concentration in medium droplets (12274.0 +/- 2825.9 pM vs 5046.5 +/- 2562.2 pM; p < 0.05).
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Affiliation(s)
- H M Kubisch
- Unit of Reproductive Biology, Division of Veterinary Medicine, Tulane National Primate Research Center, Covington, LA 70433, USA.
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24
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Bielanski A. Disinfection procedures for controlling microorganisms in the semen and embryos of humans and farm animals. Theriogenology 2007; 68:1-22. [PMID: 17512578 DOI: 10.1016/j.theriogenology.2007.03.025] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2006] [Accepted: 03/14/2007] [Indexed: 11/23/2022]
Abstract
Semen and embryos generated by assisted reproductive techniques (ARTs) may be contaminated with numerous microorganisms. Contamination may arise from systemic or local reproductive tract infections in donors or the inadvertent introduction of microorganisms during ARTs, and may lead to disease transmission. This review describes sanitary procedures which have been investigated to ascertain whether they are effective in rendering semen and embryos free of pathogenic microorganisms, including internationally adopted washing procedures, which can be supplemented by antibiotics and enzymatic treatments. Other methods include treatment with antibodies or ozone, photoinactivation, acidification, and the use of novel antiviral compounds. In conclusion, despite the wide range of antimicrobial procedures available, none can be recommended as a universal disinfection method for rendering semen and embryos free from all potentially pathogenic microorganisms. However, some procedures are unsuitable, as they can compromise the viability of semen or embryos. In humans, washing by the gradient centrifugation method appears to be effective for reducing the microbial population in semen and is harmless to the spermatozoa. A useful procedure for embryos involving multiple washes in sterile medium has much to commend it for the prevention of disease transmission; furthermore, it is recommended by the International Embryo Transfer Society (IETS).
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Affiliation(s)
- A Bielanski
- Canadian Food Inspection Agency, Animal Diseases Research Institute, Germplasm Centre of Expertise, Ottawa, Ontario, Canada K2H 8P9.
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25
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Neira JA, Tainturier D, L'Haridon RM, Martal J. Comparative IFN-tau secretion after hatching by bovine blastocysts derived ex vivo and completely produced in vitro. Reprod Domest Anim 2007; 42:68-75. [PMID: 17214777 DOI: 10.1111/j.1439-0531.2006.00732.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The interferon-tau (IFN-tau) secretion levels after hatching by bovine blastocysts derived from in vitro maturated oocytes (Group A) and from in vivo (Group B) were investigated considering embryo quality. Only very homogeneous blastocysts of excellent or good quality were considered from day 7 of culture (Group A) and day 7 after artificial insemination with frozen-thawed from the same bull used for in vitro fertilization (Group B). All embryos were individually cultured into a 50 microl droplet of synthetic oviduct fluid medium with 10% fetal calf serum. After 24-h culture both Group A (n=44) and B (n=40) secreted <54 pm IFN-tau. After 48-, 72-, 96- and 120-h culture, Group A daily secreted 143 +/- 24 pm IFN-tau (n=19) vs 85 +/- 12 pm IFN-tau (n=21) for Group B (p < 0.01), 491 +/- 128 pm IFN-tau (n=29) vs 216 +/- 37 pm IFN-tau (n=23) (NS), 499 +/- 135 pm IFN-tau (n=26) vs 353 +/- 93 pm IFN-tau (n=21) (NS), 559 +/- 136 pm IFN-tau (n=22) vs 333 +/- 75 pm IFN-tau (n=20) (NS), respectively. Taken all together during 5 days, Group A produced per embryo 1690 +/- 290 pm IFN-tau (n=22) vs 982 +/- 182 pm IFN-tau (n=20) for Group B (p < 0.05). For all culture time there were sizable percentages of embryos that did not produce concentrations of IFN-tau above a certain cut-off level, and as such were not used to compute the means. In respect of the embryo quality whatever the groups after days 7-12 of culture, IFN-tau secretions were 1815 +/- 453 pm (n=10) for the embryos of excellent quality vs 1356 +/- 200 pm (n=28) for those of good quality (NS) and 360 +/- 188 pm (n=4) (p < 0.05) for embryos of fair quality. A positive relationship between IFN-tau production and in vitro development of quality I embryos was observed, whatever the embryos origins and, the embryos completely produced in vitro secreted more IFN-tau than the embryos produced in vivo.
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Affiliation(s)
- J A Neira
- Programa Nacional de Recursos Genéticos y biotecnología Animal, CORPOICA, Grupo Biología del desarrollo, Universidad de la Salle, Bogotá-DC, Colombia
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26
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Latham KE, Gao S, Han Z. Somatic cell nuclei in cloning: strangers traveling in a foreign land. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2007; 591:14-29. [PMID: 17176552 DOI: 10.1007/978-0-387-37754-4_2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The recent successes in producing cloned offspring by somatic cell nuclear transfer are nothing short of remarkable. This process requires the somatic cell chromatin to substitute functionally for both the egg and the sperm genomes, and indeed the processing of the transferred nuclei shares aspects in common with processing of both parental genomes in normal fertilized embryos. Recent studies have yielded new information about the degree to which this substitution is accomplished. Overall, it has become evident that multiple aspects of genome processing and function are aberrant, indicating that the somatic cell chromatin only infrequently manages the successful transition to a competent surrogate for gamete genomes. This review focuses on recent results revealing these limitations and how they might be overcome.
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Affiliation(s)
- Keith E Latham
- The Fels Institute for Cancer Research and Molecular Biology, Department of Biochemistry, 3307 North Broad Street, Philadelphia, Pennsylvania 19140, USA.
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27
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Beretsos P, Loutradis D, Koussoulakos S, Margaritis LH, Kiapekou E, Mastorakos G, Papaspirou I, Makris N, Makrigiannakis A, Antsaklis A. Oxytocin Receptor Is Differentially Expressed in Mouse Endometrium and Embryo during Blastocyst Implantation. Ann N Y Acad Sci 2006; 1092:466-79. [PMID: 17308174 DOI: 10.1196/annals.1365.046] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The oxytocin (OT)-oxytocin receptor (OTR) system of the mammalian uterus has mainly been studied in relation to its involvement in the onset of labor. The aim of this study was to elucidate the in vivo expression and localization pattern of OTR in the mouse endometrium and embryo during implantation, as well as OTR mRNA expression in the in vitro developing mouse embryo. The expression of OTR or OT was detected immunohistochemically in uterine tissue sections of 5- to 8-week-old female mice between days 4 and 10 of an established pregnancy. In addition, the expression of OTR mRNA was detected by means of reverse transcription polymerase chain reaction (RT-PCR) in mouse oocytes and embryos up to the blastocyst stage. The mean ratios of normalized expression levels of OTR gene in all samples were also calculated. The recorded increase in OTR mRNA immediately after fertilization could mean a possible role of OT in this process, as OTR mRNA gradually decreased after the four-cell stage of pre-embryonic development. The differential expression of OTR during embryonic apposition and embryonic invasion/placentation in the mouse uterus suggests a potential role of OT in the implantation process of the mouse. It is possible that the interaction of OTR with the hormones included in the ovulation induction regiments utilized today in in vitro fertilization (IVF) could be affecting the receptivity/quality of the implanting endometrium.
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Affiliation(s)
- Panagiotis Beretsos
- First Department of Obstetrics and Gynecology, Division of Reproductive Medicine, Athens University Medical School, 50 Achaias St., 115 23, Athens, Greece.
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28
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Arnold DR, Bordignon V, Lefebvre R, Murphy BD, Smith LC. Somatic cell nuclear transfer alters peri-implantation trophoblast differentiation in bovine embryos. Reproduction 2006; 132:279-90. [PMID: 16885536 DOI: 10.1530/rep.1.01217] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abnormal placental development limits success in ruminant pregnancies derived from somatic cell nuclear transfer (SCNT), due to reduction in placentome number and consequently, maternal/fetal exchange. In the primary stages of an epithelial–chorial association, the maternal/fetal interface is characterized by progressive endometrial invasion by specialized trophoblast binucleate/giant cells (TGC). We hypothesized that dysfunctional placentation in SCNT pregnancies results from aberration in expression of genes known to be necessary for trophoblast proliferation (Mash2), differentiation (Hand1), and function (IFN-τ and PAG-9). We, therefore, compared the expression of these factors in trophoblast from bovine embryos derived from artificial insemination (AI),in vitrofertilization (IVF), and SCNT prior to (day 17) and following (day 40 of gestation) implantation, as well as TGC densities and function. In preimplantation embryos, Mash2 mRNA was more abundant in SCNT embryos compared to AI, while Hand1 was highest in AI and IVF relative to SCNT embryos. IFN-τ mRNA abundance did not differ among groups. PAG-9 mRNA was undetectable in SCNT embryos, present in IVF embryos and highest in AI embryos. In postimplantation pregnancies, SCNT fetal cotyledons displayed higher Mash2 and Hand1 than AI and IVF tissues. Allelic expression of Mash2 was not different among the groups, which suggests that elevated mRNA expression was not due to altered imprinting status of Mash2. The day 40 SCNT cotyledons had the fewest number of TGC compared to IVF and AI controls. Thus, expression of genes critical to normal placental development is altered in SCNT bovine embryos, and this is expected to cause abnormal trophoblast differentiation and contribute to pregnancy loss.
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Affiliation(s)
- Daniel R Arnold
- Centre de recherche en reproduction animale, Faculté de médecine vétérinaire, Université de Montréal, St-Hyacinthe, Québec, Canada J2S 7C6
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29
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Araújo M, Vale Filho V, Ferreira A, Sá W, Barreto Filho J, Camargo L, Serapião R, Silva M. Interferon tau secretion in cattle embryos in vitro fertilized before and after cryopreservation. ARQ BRAS MED VET ZOO 2005. [DOI: 10.1590/s0102-09352005000600008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The effect of cryopreservation in IFN-tau, from bovine embryos produced in vitro was evaluated. Two treated groups (G1= fresh bovine embryos, n=59 and G2= freezed embryos, n=84) were used to study the effect of cryopreservation on IFN-tau secretion. After reaching the blastocyst phase, the embryos were kept on individual culture for additional period of 7 days. On days 3 and 7 after the beginning of embryos cultivation, samples of the media culture were taken for IFN-tau secretion titration. Oocysts taken from follicles ranging from 3 to 5mm in diameter were obtained from ovaries of females at slaughterhouse. The embryos were frozen, after being dehydrated with ethylene glycol (1.8m), conditioned on 0.5ml palletes and frozen. Frozen embryos secreted lower IFN-tau than fresh embryos (P<0.05). At day 7 it was registered higher IFN-tau secretion from trophoblast than at day 3 (P<0.05). The increasing of IFN-tau secretion was observed when the blastocyst began to longed and it was directly related to the embryos development. The synthesis of IFN-tau is related to the capability of development of the blastocyst. Cryopreservation is a method that affects the maternal recognition of pregnancy and the post-freezing embryo development.
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Kimura K, Spate LD, Green MP, Murphy CN, Seidel GE, Roberts RM. Sexual dimorphism in interferon-tau production by in vivo-derived bovine embryos. Mol Reprod Dev 2004; 67:193-9. [PMID: 14694435 DOI: 10.1002/mrd.10389] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Interferon-tau (IFN-tau) is an anti-luteolytic factor responsible for preventing regression of the maternal corpus luteum (CL) during early pregnancy of cattle. In vitro-produced (IVP) bovine embryos first produce IFN-tau as blastocysts. In the present study, we have examined whether sexually dimorphic production of IFN-tau, which is observed among IVP blastocysts, also occurs among in vivo-produced blastocysts, and whether this difference between the sexes persists to day 14 when silencing of one of the X-chromosomes in the trophectoderm is complete. Embryos were flushed from cattle that had been superovulated and bred by AI. Blastocysts (63 male, 62 female) recovered between days 8.5 and 9.5 of pregnancy, were cultured individually. No differences were observed between males and females in either their developmental stage or quality at the beginning, during, and at the end of culture. Female embryos produced more IFN-tau than males by 24 hr (mean values, males: 16.6 +/- 3.7, females: 49.4 +/- 9.0 pg per embryo; P < 0.05) and 48 hr (male: 189.8 +/- 37.1, female: 410.9 +/- 66.6 pg per embryo; P < 0.05). However, the variability in IFN-tau production between individual blastocysts was so great that IFN-tau secretion is unlikely to be of value as a non-invasive means to predict embryo sex. When conceptuses were recovered at day 14, elongating males (n = 25) and females (n = 24) were similar in dimension and did not differ in their IFN-tau production after 4.5 hr (male: 2,550 +/- 607, female: 2,376 +/- 772 ng per conceptus) and 24 hr (male: 12,056 +/- 2,438, female: 8,447 +/- 1,630 ng per conceptus) of culture. Thus, sexual dimorphism in IFN-tau production is observed in both IVP and in vivo-produced expanded blastocysts, but is lost by day 14 of in vivo development.
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Affiliation(s)
- Koji Kimura
- Department of Animal Sciences, University of Missouri, Columbia, Missouri, USA.
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Nojima H, Nagaoka K, Christenson RK, Shiota K, Imakawa K. Increase in DNA methylation downregulates conceptus interferon-tau gene expression. Mol Reprod Dev 2004; 67:396-405. [PMID: 14991730 DOI: 10.1002/mrd.20002] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Expression of ovine interferon-tau (oIFNtau) genes, essential for the maternal recognition of pregnancy in ruminant ungulates, is restricted to the trophoblast and is not detected in any other cell types or tissues. Substantial secretion of oIFNtau starts on day 12-13 of pregnancy (day 0 = day of estrus), reaches the highest on day 16-17, and then declines rapidly. Ovine IFNtau mRNA, on the other hand, reaches the highest level on day 14 of pregnancy, 2-3 days before peak production of the protein. In this study, day 14 and 17 conceptuses treated with 5-aza-2'-deoxycytidine, an inhibitor of DNA methylation, were cultured in vitro and only day 17, not day 14, conceptuses resulted in upregulation of oIFNtau gene expression. To gain insight into the molecular mechanism of oIFNtau gene downregulation, the methylation status within 1 kb of the 5'-flanking region of oIFNtau-o10 gene was investigated: CpG dinucleotides of this gene in day 14 ovine conceptuses were hypomethylated compared to day 20 conceptuses or other tissues. In vitro methylation of oIFNtau-o10-reporter constructs caused suppression of reporter activity in transient transfections. Cotransfection of methyl-CpG-binding protein (MeCP2) with the reporter construct elicited further suppression of the reporter activity. In electrophoretic mobility shift assay (EMSA), patterns of shifted bands did not show much difference between methylated and unmethylated probes in distal regions, but exhibited differences in the proximal region of upstream sequences of the oIFNtau gene. These results provide evidence that changes in the degree of DNA methylation could be one of the major mechanisms leading to downregulation of the oIFNtau-o10 gene during early gestation, and possibly its silencing in nonconceptus tissues.
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Affiliation(s)
- Hisashi Nojima
- Laboratory of Animal Breeding, Faculty of Agriculture, The University of Tokyo, Tokyo, Japan
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Rasmussen TA, Ealy AD, Kubisch HM. Identification of bovine and novel interferon-? alleles in the American plains bison (bison bison) by analysis of hybrid cattle x bison blastocysts. Mol Reprod Dev 2004; 70:228-34. [PMID: 15570611 DOI: 10.1002/mrd.20198] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The objective of this study was to generate bison x cattle hybrid embryos by in vitro fertilization, to assess their developmental potential, to determine the pattern of secretion of the embryonic signaling molecule interferon-tau (IFN-tau), and to identify novel IFN-tau mRNA polymorphism in the American plains bison. A total of 600 bovine oocytes were inseminated with frozen-thawed bison semen. Of these, 40.7% cleaved and 14.8% proceeded to the blastocyst stage. Individual blastocysts were cultured on a basement membrane (Matrigel) and their ability to attach and form outgrowths was monitored. A total of 36 blastocysts were cultured of which 22 formed outgrowths. During individual culture, medium samples were collected and their IFN-tau concentration was measured. On day 6 after onset of individual culture, attached outgrowths produced significantly more IFN-tau than unattached viable or degenerate blastocysts. At this time, female conceptuses also produced significantly more IFN-tau than their male cohorts. However, by day 12 this difference had disappeared. Total mRNA was extracted from three individual outgrowths and analyzed by RT-PCR. Subsequent sequencing of 28 clones showed several known bovine IFN-tau sequences as well as two novel sequences termed bisIFN-tau1 and 2. To determine the origin of these, DNA was extracted from bison semen and analyzed by PCR. One bovine IFN-tau sequence (bovIFN-tau1d) as well as bisIFN-tau2 and a third novel sequence bisIFN-tau3 were detected. This study demonstrates the feasibility of using hybrid embryos for the analysis of developmentally regulated gene expression in species where embryos may not be available.
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Affiliation(s)
- Terri A Rasmussen
- Division of Comparative Pathology, Tulane National Primate Research Center, 18703 Three Rivers Road, Covington, LA 70433, USA
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Patel OV, Yamada O, Kizaki K, Takahashi T, Imai K, Takahashi S, Izaike Y, Schuler LA, Takezawa T, Hashizume K. Expression of trophoblast cell-specific pregnancy-related genes in somatic cell-cloned bovine pregnancies. Biol Reprod 2003; 70:1114-20. [PMID: 14681195 DOI: 10.1095/biolreprod.103.020198] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
We compared the expression of bovine prolactin-related protein-1 (bPRP-1), placental lactogen (bPL), and pregnancy-associated glycoproteins-1 (bPAG-1) and -9 (bPAG-9) genes in artificially inseminated (AI) and nuclear transferred (NT) cows during the first trimester of gestation using real-time reverse transcription-polymerase chain reaction and in situ hybridization. Placentomal (cotyledonary, caruncular) and interplacentomal (intercotyledonary, intercaruncular) tissues of AI and NT cows carrying either motile (M) or immotile (IM) fetuses were examined. Transcripts for bPL and bPAG-9 were lower (P < 0.01) in the fetal membranes of NT (n = 4) cows at Day 30 of gestation, compared with AI (n = 4) cows. There was no difference in the mean (+/- SEM) levels of expressions of bPRP-1, bPL, and PAG-1 in the placentomal and interplacentomal tissues of AI (n = 5) and NT (M, n = 4) cows at Day 60 of gestation. The mRNAs for bPRP-1, bPL, bPAG-1, and bPAG-9 genes were higher (P < 0.01) in the caruncular tissue of AI cows, compared with NT (IM, n = 4) cows at Day 60 of gestation. Expression of bPRP-1, bPL, bPAG-1, and bPAG-9 in the placentomal and interplacentomal tissues of the NT (n = 3) group varied considerably more, compared with the AI (n = 4) group at Day 100 of gestation. These findings suggest defective binucleate cell-specific gene transcriptional commands in NT cows.
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Affiliation(s)
- Osman V Patel
- National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602 Japan
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Lonergan P, Rizos D, Gutierrez-Adán A, Moreira PM, Pintado B, de la Fuente J, Boland MP. Temporal divergence in the pattern of messenger RNA expression in bovine embryos cultured from the zygote to blastocyst stage in vitro or in vivo. Biol Reprod 2003; 69:1424-31. [PMID: 12826577 DOI: 10.1095/biolreprod.103.018168] [Citation(s) in RCA: 219] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
The objective of this study was to examine the time during the postfertilization period that gene expression patterns in in vitro-cultured bovine embryos diverge from those of their in vivo-cultured counterparts. Presumptive bovine zygotes were produced by in vitro maturation and fertilization of immature oocytes collected from the ovaries of slaughtered animals. Approximately 20 h post insemination (hpi), zygotes were denuded and randomly divided into two groups for culture either in vitro, in synthetic oviduct fluid medium, or in vivo, in the ewe oviduct. Embryos were recovered from both systems at approximately 30 hpi (2-cell), 2 (4-cell), 3 (8-cell), 4 (16-cell), 5 (early morula), 6 (compact morula), or 7 (blastocyst) days post insemination. On recovery, they were examined for stage of development and snap frozen in liquid nitrogen for the analysis of transcript abundance using real-time polymerase chain reaction. The transcripts studied were glucose transporter 5, sarcosine oxidase, mitochondrial Mn-superoxide dismutase, connexin 43, interferon tau, insulin-like growth factor II, apoptosis regulator box-alpha and insulin-like growth factor-I receptor, most of which are known from our previous work to differ in terms of transcript abundance in blastocysts derived from culture in vitro or in vivo. The results demonstrate that the relative abundance of the transcripts studied varies throughout the preimplantation period and is strongly influenced by the culture environment. In addition, the data demonstrate that changes in transcript abundance in blastocyst stage embryos are in many cases a consequence of perturbed transcription earlier in development. Depending on the transcript, these differences may be evident by as little as 10 h of initiation of culture. Such information has implications not only for basic biology but also for human assisted reproduction in which there is a move toward culturing embryos to the blastocyst stage, necessitating prolonged culture in vitro under potentially deleterious conditions.
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Affiliation(s)
- P Lonergan
- Department of Animal Science and Production, University College Dublin, Lyons Research Farm, Newcastle, County Dublin 4, Ireland.
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Wolf E, Arnold GJ, Bauersachs S, Beier HM, Blum H, Einspanier R, Fröhlich T, Herrler A, Hiendleder S, Kölle S, Prelle K, Reichenbach HD, Stojkovic M, Wenigerkind H, Sinowatz F. Embryo-maternal communication in bovine - strategies for deciphering a complex cross-talk. Reprod Domest Anim 2003; 38:276-89. [PMID: 12887567 DOI: 10.1046/j.1439-0531.2003.00435.x] [Citation(s) in RCA: 123] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Early embryonic development, implantation and maintenance of a pregnancy are critically dependent on an intact embryo-maternal communication. So far, only few signals involved in this dialogue have been identified. In bovine and other ruminants, interferon tau is the predominant embryonic pregnancy recognition signal, exhibiting antiluteolytic activity. However, this is just one aspect of the complex process of embryo-maternal signalling, and a number of other systems are more likely to be involved. To gain a more comprehensive understanding of these important mechanisms, integrated projects involving specialists in embryology, reproductive biotechnology and functional genome research are necessary to perform a systematic analysis of interactions between pre-implantation stage embryos and oviduct or uterine epithelial cells, respectively. State-of-the-art transcriptomic and proteomic technologies will identify reciprocal signals between embryos and their maternal environment and the respective downstream reaction cascades. For in vivo studies, the use of monozygotic twins as recipient animals provides elegant model systems, thus eliminating genetic variability as a cause of differential gene expression. In addition, suitable systems for the co-culture of oviduct epithelial or endometrium cells with the respective embryonic stages need to be established for functional validation of candidate genes potentially involved in the dialogue between embryos and their maternal environment. The knowledge of these mechanisms should help to increase the pregnancy rate following embryo transfer and to avoid embryonic losses. Candidate genes involved in embryo-maternal communication will also be used to define new quality criteria for the selection of embryos for transfer to recipients. Another application is the supplementation of embryotrophic factors or components of embryo-maternal signalling in optimized formulations, such as bioartificial matrices. As a long-term goal, signalling mechanisms identified in bovine will also be functionally evaluated in other species, including the human.
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Affiliation(s)
- E Wolf
- Institut für Molekulare Tierzucht, Genzentrum der Ludwig-Maximilians-Universität München, München, Germany.
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Kubisch HM, Rasmussen TA, Johnson KM. Interferon-tau in bovine blastocysts following parthenogenetic activation of oocytes: pattern of secretion and polymorphism in expressed mRNA sequences. Mol Reprod Dev 2003; 64:79-85. [PMID: 12420302 DOI: 10.1002/mrd.10211] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A series of experiments were conducted to examine the pattern of production and secretion of interferon-tau (IFN-tau) by blastocysts following parthenogenetic activation of bovine oocytes. In the first experiment, 36.8, 24.1, and 33.2% of IVF-derived and parthenogenetically activated oocytes cultured in the presence or absence of a monolayer of buffalo rat liver cells, respectively, reached the blastocyst stage. Following individual culture of blastocysts, IFN-tau concentration in medium droplets was similar among the three groups, although IVF-derived blastocysts contained significantly more cells. In the second experiment, 156 IVF-derived blastocysts were sexed by PCR with 75 and 81, respectively, being male and female. IFN-tau secretion of these was compared to that of 70 parthenogenetic blastocysts. Female and parthenogenetic blastocysts produced significantly more IFN-tau than their male counterparts. In the third experiment, the ability of hatched blastocysts to form outgrowths and the pattern of their IFN-tau secretion were examined. Of the 48 IVF-derived blastocysts, 44 formed outgrowths compared to 41 of the 42 hatched parthenotes. Parthenogenetic outgrowths were significantly larger after 7 days, but this difference had disappeared after 14 days. IFN-tau secretion did not differ between the two groups. Lastly, sequence analyses of expressed mRNA from individual parthenogenetic blastocyst outgrowths showed four different transcript types which, based on their predicted amino acid sequence, belong to two subgroups, IFN-tau1 and IFN-tau3. In addition, one new transcript sequence was identified, encoding a new protein isoform.
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Affiliation(s)
- H Michael Kubisch
- Department of Veterinary Medicine, Tulane National Primate Research Center, Covington, Louisiana 70435, USA.
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Abstract
Embryos were collected surgically from superovulated ewes on days 7, 8, 9 and 10 (oestrus=day 0) to evaluate the long-term culture and interferon-tau (IFN-tau) secretion of ovine blastocysts. Embryos were cultured in 2 ml Dulbecco's modification of Eagle's medium (DMEM) supplemented with 15 mg/ml BSA in 5% CO(2) in air or DMEM without BSA in 5% CO(2), 7% O(2), and 88% N(2) at 39 degrees C, examined daily for morphological features and diameter and each day placed into fresh culture medium to enable daily measurement of IFN-tau secretion. Nine day-7 and two day-9 embryos were cultured in DMEM with BSA and nine continued to develop. The day-7 embryos reached a mean maximum diameter of 370.0+/-50.25 microm after 4 days in culture. Nineteen day-7, 12 day-8 and five day-10 embryos were cultured in DMEM without BSA but only six of the day-7 and one day-8 embryos survived for at least 7 days with the former reaching a mean maximum diameter on day 7 of 357+/-43.75 microm whereas all five day-10 embryos survived for at least 7 days reaching a mean maximum diameter on day 6 of 1038+/-155.8 microm. An anti-viral assay and a ELISA for IFN-tau were developed. There was a considerable variation in the time of onset and amount of IFN-tau secreted that did not seem to be related to embryo morphology. Of 28 day-7 embryos cultured, 60.7% were secreting IFN-tau after 1 day of culture whereas 87.5% of day-8 embryos were secreting IFN-tau after 1 day in culture. The mean concentration of IFN-tau secreted by day-8 embryos after 1 day in culture (10.99+/-2.55 ng/ml) was not significantly different to day-7 embryos after 2 days in culture (8.8+/-1.75 ng/ml).
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Affiliation(s)
- W Caroline Lo
- Research Institute for Animal Production, Bogor, Indonesia, Australia
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Kubisch HM, Larson MA, Ealy AD, Murphy CN, Roberts RM. Genetic and environmental determinants of interferon-tau secretion by in vivo- and in vitro-derived bovine blastocysts. Anim Reprod Sci 2001; 66:1-13. [PMID: 11343838 DOI: 10.1016/s0378-4320(01)00086-0] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Several experiments were conducted to assess the effects of genotype and various culture media on interferon-tau secretion by in vitro-derived bovine blastocysts and to compare these values with interferon released by blastocysts flushed from superovulated cows. In experiment 1, oocytes were inseminated with semen from three different bulls. While paternal genotype had no effect on cleavage rate, the size or hatching ability of blastocysts, it was a significant determinant of the embryo's ability to develop to the blastocyst stage and of subsequent interferon-tau secretion. In the second experiment, embryos were cultured in synthetic oviductal fluid containing either polyvinyl alcohol, bovine serum albumin or fetal bovine serum. While there was no effect of supplement on the percentage of embryos developing to the blastocyst stage, blastocysts which formed in medium with polyvinyl alcohol had significantly fewer cells, were older at blastocyst formation and produced significantly more interferon-tau. In the third experiment, embryos were cultured to the blastocyst stage in either TCM199 alone or in co-culture with buffalo rat liver, bovine oviductal or bovine uterine epithelial cells. Culture with oviductal or buffalo rat liver cells increased blastocyst cell number, although secretion of interferon-tau was not affected. In the final experiment, bovine blastocysts were flushed from superovulated cows on Day 7 following insemination. Overall, secretion of interferon-tau by in vivo-produced blastocysts did not differ from that of age-matched blastocysts produced in vitro.
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Affiliation(s)
- H M Kubisch
- Department of Animal Sciences, University of Missouri, Columbia 65211, USA.
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Kubisch HM, Larson MA, Kiesling DO. Control of interferon-tau secretion by in vitro-derived bovine blastocysts during extended culture and outgrowth formation. Mol Reprod Dev 2001; 58:390-7. [PMID: 11241775 DOI: 10.1002/1098-2795(20010401)58:4<390::aid-mrd6>3.0.co;2-v] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A series of experiments was conducted to examine the pattern of interferon-tau (IFN-tau) secretion by bovine blastocysts during extended culture in vitro. In the first experiment, blastocysts were cultured individually for three 48-hour periods. The day of blastocyst formation affected how much IFN-tau was produced during the first two culture periods, but not during the third period. The overall secretion of IFN-tau during the 6-day period increased significantly and well beyond what could be accounted for by the concomitant increase in cell numbers. In the second experiment, blastocysts were initially cultured in individual droplets for 48 hr, then plated into 48-well plates. Medium concentrations of IFN-tau were determined after 48 hr and again after 6 and 12 days of culture. Initial IFN-tau secretion did not affect the ability to form outgrowths or their final size, and initial differences in secretion between groups of blastocysts had disappeared by the second and third analyses. In the third experiment, blastocysts were cultured individually for 48 hr in droplets containing the medium that had been flushed through the uteri of non-pregnant sheep on days 10, 12, and 15 of the estrous cycle. Culture in the medium obtained from the Day 15 flush significantly increased the number of cells that blastocysts contained, as well as IFN-tau secretion.
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Affiliation(s)
- H M Kubisch
- Department of Animal Sciences, University of Missouri, Columbia, Missouri, USA.
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Cloning LiteratureWatch 1997-1999. CLONING 1999; 1:173-81. [PMID: 16218817 DOI: 10.1089/15204559950019942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
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