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Monzani PS, Sangalli JR, Sampaio RV, Guemra S, Zanin R, Adona PR, Berlingieri MA, Cunha-Filho LFC, Mora-Ocampo IY, Pirovani CP, Meirelles FV, Wheeler MB, Ohashi OM. Human proinsulin production in the milk of transgenic cattle. Biotechnol J 2024; 19:e2300307. [PMID: 38472101 DOI: 10.1002/biot.202300307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 01/16/2024] [Accepted: 01/24/2024] [Indexed: 03/14/2024]
Abstract
BACKGROUND The worldwide growing demand for human insulin for treating diabetes could be supplied by transgenic animals producing insulin in their milk. METHODS AND RESULTS Pseudo-lentivirus containing the bovine β-casein promoter and human insulin sequences was used to produce modified adult fibroblasts, and the cells were used for nuclear transfer. Transgenic embryos were transferred to recipient cows, and one pregnancy was produced. Recombinant protein in milk was evaluated using western blotting and mass spectrometry. One transgenic cow was generated, and in milk analysis, two bands were observed in western blotting with a molecular mass corresponding to the proinsulin and insulin. The mass spectrometry analysis showed the presence of human insulin more than proinsulin in the milk, and it identified proteases in the transgenic milk that could convert proinsulin into insulin and insulin-degrading enzyme that could degrade the recombinant protein. CONCLUSION The methodologies used for generating the transgenic cow allowed the detection of the production of recombinant protein in the milk at low relative expression compared to milk proteins, using mass spectrometry, which was efficient for detecting recombinant protein with low expression in milk. Milk proteases could act on protein processing converting recombinant protein to functional protein. On the other hand, some milk proteases could act in degrading the recombinant protein.
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Affiliation(s)
- Paulo S Monzani
- Center for Biological and Health Sciences, University of Northern Paraná, Londrina, Paraná, Brazil
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Juliano R Sangalli
- Department of Veterinary Medicine, University of São Paulo, Pirassununga, São Paulo, Brazil
| | - Rafael V Sampaio
- Department of Veterinary Medicine, University of São Paulo, Pirassununga, São Paulo, Brazil
| | - Samuel Guemra
- Center for Biological and Health Sciences, University of Northern Paraná, Londrina, Paraná, Brazil
| | - Renato Zanin
- Laffranchi Agriculture, Tamarana, Paraná, Brazil
| | - Paulo R Adona
- Center for Biological and Health Sciences, University of Northern Paraná, Londrina, Paraná, Brazil
| | - Maria A Berlingieri
- Center for Biological and Health Sciences, University of Northern Paraná, Londrina, Paraná, Brazil
| | - Luiz F C Cunha-Filho
- Center for Biological and Health Sciences, University of Northern Paraná, Londrina, Paraná, Brazil
| | - Irma Y Mora-Ocampo
- Department of Biological Sciences, State University of Santa Cruz (UESC), Ilhéus, Bahia, Brazil
| | - Carlos P Pirovani
- Department of Biological Sciences, State University of Santa Cruz (UESC), Ilhéus, Bahia, Brazil
| | - Flávio V Meirelles
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Matthew B Wheeler
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Otavio M Ohashi
- Institute of Biological Sciences, Federal University of Pará, Belém, Pará, Brazil
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Monzani PS, Adona PR, Long SA, Wheeler MB. Cows as Bioreactors for the Production of Nutritionally and Biomedically Significant Proteins. Adv Exp Med Biol 2021; 1354:299-314. [PMID: 34807448 DOI: 10.1007/978-3-030-85686-1_15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Dairy and beef cattle make a vital contribution to global nutrition, and since their domestication, they have been continuously exposed to natural and artificial selection to improve production characteristics. The technologies of transgenesis and gene editing used in cattle are responsible for generating news characteristics in bovine breeding, such as alteration of nutritional components of milk and meat enhancing human health benefits, disease resistance decreasing production costs and offering safe products for human food, as well as the recombinant protein production of biomedical significance. Different methodologies have been used to generate transgenic cattle as bioreactors. These methods include the microinjection of vectors in pronuclear, oocyte or zygote, sperm-mediate transgenesis, and somatic cell nuclear transfer. Gene editing has been applied to eliminate unwanted genes related to human and animal health, such as allergy, infection, or disease, and to insert transgenes into specific sites in the host genome. Methodologies for the generation of genetically modified cattle are laborious and not very efficient. However, in the last 30 years, transgenic animals were produced using many biotechnological tools. The result of these modifications includes (1) the change of nutritional components, including proteins, amino acids and lipids for human nutrition; (2) the removal allergic proteins milk; (3) the production of cows resistant to disease; or (4) the production of essential proteins used in biomedicine (biomedical proteins) in milk and blood plasma. The genetic modification of cattle is a powerful tool for biotechnology. It allows for the generation of new or modified products and functionality that are not currently available in this species.
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Affiliation(s)
- P S Monzani
- Instituto Chico Mendes de Conservação da Biodiversidade/Centro Nacional de Pesquisa e Conservação da Biodiversidade Aquática Continental, Pirassununga, SP, Brasil.
| | - P R Adona
- Saúde e Produção de Ruminantes, Universidade Norte do Paraná, Arapongas, PR, Brasil
| | - S A Long
- Departments of Animal Sciences and Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - M B Wheeler
- Departments of Animal Sciences and Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA.,Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
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Sovernigo TC, Adona PR, Monzani PS, Guemra S, Barros FDA, Lopes FG, Leal CLV. Effects of supplementation of medium with different antioxidants during in vitro maturation of bovine oocytes on subsequent embryo production. Reprod Domest Anim 2017; 52:561-569. [DOI: 10.1111/rda.12946] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Accepted: 02/01/2017] [Indexed: 11/29/2022]
Affiliation(s)
- TC Sovernigo
- Escola de Medicina Veterinária; Universidade Norte do Paraná; Arapongas Paraná Brazil
| | - PR Adona
- Escola de Medicina Veterinária; Universidade Norte do Paraná; Arapongas Paraná Brazil
- Centro de Ciência e Tecnologia de Leite e Derivados; Universidade Norte do Paraná; Londrina Paraná Brazil
- Laboratório de Reprodução Animal; Agropecuária Laffranchi; Tamarana Paraná Brazil
| | - PS Monzani
- Departamento de Medicina Veterinária; Universidade de São Paulo; Pirassununga São Paulo Brazil
| | - S Guemra
- Escola de Medicina Veterinária; Universidade Norte do Paraná; Arapongas Paraná Brazil
- Laboratório de Reprodução Animal; Agropecuária Laffranchi; Tamarana Paraná Brazil
| | - FDA Barros
- Escola de Medicina Veterinária; Universidade Norte do Paraná; Arapongas Paraná Brazil
| | - FG Lopes
- Escola de Medicina Veterinária; Universidade Norte do Paraná; Arapongas Paraná Brazil
| | - CLV Leal
- Departamento de Medicina Veterinária; Universidade de São Paulo; Pirassununga São Paulo Brazil
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Abstract
The use of recombinant proteins has increased in diverse commercial sectors. Various systems for protein production have been used for the optimization of production and functional protein expression. The mammary gland is considered to be a very interesting system for the production of recombinant proteins due to its high level of expression and its ability to perform post-translational modifications. Cows produce large quantities of milk over a long period of lactation, and therefore this species is an important candidate for recombinant protein expression in milk. However, transgenic cows are more difficult to generate due to the inefficiency of transgenic methodologies, the long periods for transgene detection, recombinant protein expression and the fact that only a single calf is obtained at the end of each pregnancy. An increase in efficiency for transgenic methodologies for cattle is a big challenge to overcome. Promising methodologies have been proposed that can help to overcome this obstacle, enabling the use of transgenic cattle as bioreactors for protein production in milk for industry.
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Affiliation(s)
- Paulo S Monzani
- a Centro de Ciências Biológicas e da Saúde , Universidade Norte do Paraná , Londrina , Paraná , Brazil.,b Departamento de Ciências Básicas , Universidade de São Paulo , Pirassununga , São Paulo , Brazil
| | - Paulo R Adona
- a Centro de Ciências Biológicas e da Saúde , Universidade Norte do Paraná , Londrina , Paraná , Brazil
| | - Otávio M Ohashi
- c Instituto de Ciências Biológicas , Universidade Federal do Pará , Belém , Pará , Brazil
| | - Flávio V Meirelles
- b Departamento de Ciências Básicas , Universidade de São Paulo , Pirassununga , São Paulo , Brazil
| | - Matthew B Wheeler
- d Carl Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign , Urbana , IL , USA
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Monzani PS, Guemra S, Adona PR, Ohashi OM, Meirelles FV, Wheeler MB. MAC-T cells as a tool to evaluate lentiviral vector construction targeting recombinant protein expression in milk. Anim Biotechnol 2014; 26:136-42. [PMID: 25380466 DOI: 10.1080/10495398.2014.941468] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Prior to generating transgenic animals for bioreactors, it is important to evaluate the vector constructed to avoid poor protein expression. Mammary epithelial cells cultured in vitro have been proposed as a model to reproduce the biology of the mammary gland. In the present work, three lentiviral vectors were constructed for the human growth hormone (GH), interleukin 2 (IL2), and granulocyte colony-stimulating factor 3 (CSF3) genes driven by the bovine β-casein promoter. The lentiviruses were used to transduce mammary epithelial cells (MAC-T), and the transformed cells were cultured on polystyrene in culture medium with and without prolactin. The gene expression of transgenes was evaluated by PCR using cDNA, and recombinant protein expression was evaluated by Western-blotting using concentrated medium and cellular extracts. The gene expression, of the three introduced genes, was detected in both induced and non induced MAC-T cells. The human GH protein was detected in the concentrated medium, whereas CSF3 was detected in the cellular extract. Apparently, the cellular extract is more appropriate than the concentrated medium to detect recombinant protein, principally because concentrated medium has a high concentration of bovine serum albumin. The results suggest that MAC-T cells may be a good system to evaluate vector construction targeting recombinant protein expression in milk.
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Affiliation(s)
- Paulo S Monzani
- a Centro de Ciencias Biológicas e da Saúde , Universidade Norte do Paraná , Londrina , Paraná , Brazil
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De Bem THC, Adona PR, Bressan FF, Mesquita LG, Chiaratti MR, Meirelles FV, Leal CLV. The Influence of Morphology, Follicle Size and Bcl-2 and Bax Transcripts on the Developmental Competence of Bovine Oocytes. Reprod Domest Anim 2014; 49:576-583. [DOI: 10.1111/rda.12325] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Accepted: 04/03/2014] [Indexed: 11/28/2022]
Affiliation(s)
- THC De Bem
- Departamento de Ciências; Faculdade de Zootecnia e Engenharia de Alimentos Básicas; Universidade de São Paulo; Pirassununga Brazil
- Departamento de Genética; Faculdade de Medicina de Ribeirão Preto; Universidade de São Paulo; Ribeirão Preto Brazil
| | - PR Adona
- Universidade Norte do Paraná; Londrina Brazil
- Agropecuária Laffranchi; Tamarana Brazil
| | - FF Bressan
- Departamento de Ciências; Faculdade de Zootecnia e Engenharia de Alimentos Básicas; Universidade de São Paulo; Pirassununga Brazil
| | - LG Mesquita
- Departamento de Ciências; Faculdade de Zootecnia e Engenharia de Alimentos Básicas; Universidade de São Paulo; Pirassununga Brazil
| | - MR Chiaratti
- Departamento de Genética e Evolução; Universidade Federal de São Carlos; São Carlos Brazil
| | - FV Meirelles
- Departamento de Ciências; Faculdade de Zootecnia e Engenharia de Alimentos Básicas; Universidade de São Paulo; Pirassununga Brazil
| | - CLV Leal
- Departamento de Ciências; Faculdade de Zootecnia e Engenharia de Alimentos Básicas; Universidade de São Paulo; Pirassununga Brazil
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De Bem TH, Chiaratti MR, Rochetti R, Bressan FF, Sangalli JR, Miranda MS, Pires PR, Schwartz KR, Sampaio RV, Fantinato-Neto P, Pimentel JR, Perecin F, Smith LC, Meirelles FV, Adona PR, Leal CL. Viable Calves Produced by Somatic Cell Nuclear Transfer Using Meiotic-Blocked Oocytes. Cell Reprogram 2011; 13:419-29. [DOI: 10.1089/cell.2011.0010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Tiago H.C. De Bem
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
| | - Marcos R. Chiaratti
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
| | - Raquel Rochetti
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
| | - Fabiana F. Bressan
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
| | - Juliano R. Sangalli
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
| | - Moysés S. Miranda
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
- Departamento de Biologia, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Pará, Brazil
| | - Pedro R.L. Pires
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
| | - Kátia R.L. Schwartz
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
| | - Rafael V. Sampaio
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
- Departamento de Biologia, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Pará, Brazil
| | - Paulo Fantinato-Neto
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
| | - José R.V. Pimentel
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
| | - Felipe Perecin
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
| | - Lawrence C. Smith
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
- Centre de recherche en reproduction animale, Faculté de médecine vétérinaire, Université de Montréal, St. Hyacinthe, Québec, Canada
| | - Flávio V. Meirelles
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
| | - Paulo R. Adona
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
- Universidade do Norte do Paraná, Londrina, PR, Brazil
| | - Cláudia L.V. Leal
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
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Adona PR, de Bem THC, Mesquita LG, Rochetti RC, Leal CLV. Embryonic Development and Gene Expression in Oocytes Cultured In Vitro in Supplemented Pre-Maturation and Maturation Media. Reprod Domest Anim 2011; 46:e31-8. [DOI: 10.1111/j.1439-0531.2010.01618.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Schwarz KRL, Pires PRL, de Bem THC, Adona PR, Leal CLV. Consequences of nitric oxide synthase inhibition during bovine oocyte maturation on meiosis and embryo development. Reprod Domest Anim 2010; 45:75-80. [PMID: 20137060 DOI: 10.1111/j.1439-0531.2008.01242.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The importance of nitric oxide synthase (NOS) in bovine oocyte maturation was investigated. Oocytes were in vitro matured with the NOS inhibitor N(w)-L-nitro-arginine methyl-ester (10(-7), 10(-5) and 10(-3) m L-NAME) and metaphase II (MII) rates and embryo development and quality were assessed. The effect of L-NAME (10(-7) m) during pre-maturation and/or maturation on embryo development and quality was also assessed. L-NAME decreased MII rates (78-82%, p < 0.05) when compared with controls without L-NAME (96%). Cleavage (77-88%, p > 0.05), Day 7 blastocyst rates (34-42%, p > 0.05) and total cell numbers in blastocysts were similar for all groups (146-171 cells, p > 0.05). Day 8 blastocyst TUNEL positive cells (3-4 cells) increased with L-NAME treatment (p < 0.05). For oocytes cultured with L-NAME during pre-maturation and/or maturation, Day 8 blastocyst development (26-34%) and Day 9 hatching rates (15-22%) were similar (p > 0.05) to controls pre-matured and matured without NOS inhibition (33 and 18%, respectively), while total cell numbers (Day 9 hatched blastocysts) increased (264-324 cells, p < 0.05) when compared with the controls (191 cells). TUNEL positive cells increased when NOS was inhibited only during the maturation period (8 cells, p < 0.05) when compared with the other groups (3-4 cells). NO may be involved in meiosis progression to MII and its deficiency during maturation increases apoptosis in embryos produced in vitro. Nitric oxide synthase inhibition during pre-maturation and/or maturation affects embryo quality.
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Affiliation(s)
- K R L Schwarz
- Departamento de Ciências Básicas, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga-SP, Brazil
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Quetglas MD, Adona PR, De Bem THC, Pires PRL, Leal CLV. Effect of Cyclin-dependent Kinase (CDK) Inhibition on Expression, Localization and Activity of Maturation Promoting Factor (MPF) and Mitogen Activated Protein Kinase (MAPK) in Bovine Oocytes. Reprod Domest Anim 2009; 45:1074-81. [DOI: 10.1111/j.1439-0531.2009.01498.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Adona PR, Pires PRL, Quetglas MD, Schwarz KRL, Leal CLV. Nuclear maturation kinetics and in vitro embryo development of cattle oocytes prematured with butyrolactone I combined or not combined with roscovitine. Anim Reprod Sci 2008; 104:389-97. [PMID: 17644285 DOI: 10.1016/j.anireprosci.2007.06.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2006] [Accepted: 06/07/2007] [Indexed: 11/15/2022]
Abstract
Cyclin dependent kinase inhibitors (CDKIs) may be used for pre-maturation culture, but can accelerate nuclear maturation. The aim of the present research was to compare the effect of butyrolactone I (BLI) alone or combined with roscovitine (ROS) at lesser than typically used concentrations on nuclear maturation kinetics and embryo development. To assess maturation kinetics (Experiment 1), oocytes were cultured in 100 microM BLI (B) or 6.25 microM BLI+12.5 microM ROS (BR) in TCM-199 for 24 h. Oocytes were subsequently submitted to in vitro maturation (IVM) in TCM-199+0.5 microg/ml FSH, 50 microg/ml LH and 10% FCS for another 24 h, during which oocytes were fixed every 3 h. In Experiment 2, oocytes were submitted to 24h pre-maturation treatments, with the inhibitors being diluted in TCM-199 or DMEM. IVM lasted 21 h in the culture media DMEM+0.5 microg/ml FSH, 50 microg/ml LH, 5% FCS and 50 ng/ml EGF. After IVM, oocytes from all groups were fertilized in vitro. Oocytes and sperm (2x10(6) sperm cells/ml) were co-cultured for 18 h. Embryos were co-cultured with granulosa cells in CR2aa for 8 days. All cultures were in droplets under oil, at 38.5 degrees C and 5% CO2 in air. In both experiments, control oocytes (C) were submitted only to IVM. In Experiment 1, at 0 h, C and B oocytes were all (100%) at the germinal vesicle stage (GV) of development. BR had fewer GV oocytes (89%, P<0.05). After 3 h IVM, B and BR had fewer oocytes in GV (84.7 and 79.6%, P>0.05) than C (100%, P<0.05). At 12 h, most oocytes were at intermediate stages (metaphase to telophase I) in all groups (approximately 80%, P>0.05). After 21 (77-89%) and 24 h (85-95%), all groups had similar metaphase II (MII) rates of development (P>0.05). In Experiment 2, cleavage (79-84%, P>0.05) and Day 7 blastocyst rates (26-36%, P>0.05) were similar. After 8 days, the group pre-matured with BR in DMEM had lesser blastocyst rates of development (32.3%) lower than C (40.1%, P<0.05). The other groups were similar to C (35-38%, P>0.05). Hatching rates were similar (10-15%, P>0.05) as were total cell numbers (141-170). In conclusion, BR is less effective in maintaining meiosis block; B and BR accelerate meiosis resumption; and use of pre-maturation medium may affect developmental rates.
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Affiliation(s)
- P R Adona
- ZAB, FZEA, USP, Pirassununga, SP, Brazil
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Schwarz KRL, Pires PRL, Adona PR, Câmara de Bem TH, Leal CLV. Influence of nitric oxide during maturation on bovine oocyte meiosis and embryo development in vitro. Reprod Fertil Dev 2008; 20:529-36. [DOI: 10.1071/rd07209] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2007] [Accepted: 01/27/2008] [Indexed: 11/23/2022] Open
Abstract
The effect of s-nitroso-n-acetyl-l,l-penicillamine (SNAP, a nitric oxide donor) during in vitro maturation (IVM) on nuclear maturation and embryo development was investigated. The effect of increasing nitric oxide (NO) during prematuration or maturation, or both, on embryo development was also assessed. 10–3 m SNAP nearly blocked oocytes reaching metaphase II (MII) (7%, P < 0.05) while 10–5 m SNAP showed intermediate proportions (55%). For 10–7 m SNAP and controls (without SNAP), MII percentages were similar (72% for both, P > 0.05), but superior to the other treatment groups (P < 0.05). Blastocyst development, however, was not affected (38% for all treatments, P < 0.05). TUNEL-positive cells in hatched blastocysts (Day 9) increased when IVM included 10–5 m SNAP (8 v. 3 to 4 cells in the other treatments, P > 0.05), without affecting total cell numbers (240 to 291 cells, P > 0.05). When oocytes were prematured followed by IVM with or without 10–7 m SNAP, during either culture period or both, blastocyst development was similar (26 to 40%, P > 0.05). When SNAP was included during both prematuration and IVM, the proportion of Day 9 hatched embryos increased (28% v. 14 to 19% in the other treatments, P < 0.05). Apoptotic cells, however, increased when SNAP was included (6 to 10 cells) in comparison to prematuration and maturation without SNAP (3 cells, P < 0.05). NO may be involved in meiotic progression and apoptosis during embryo development.
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Abstract
In vitro studies that use isolated oocytes benefit from the ability to harvest oocytes of excellent morphological quality in sufficient numbers to allow the replicability of techniques and experiments. The objective of the present study was to verify the effect of the age of the donor bitch on the quantity and quality of oocytes recovered from isolated ovaries, using the slicing technique. Ten bitches (45 days to 13 years) were ovariohysterectomized, and the ovaries were placed in phosphate buffered saline (PBS), supplemented with bovine fetal serum (5%), and oocyte-cumulus-complexes (OCCs) were obtained by slicing the ovarian tissue. The OCSs were classified morphologically as Degree I (DI, best), Degree II (DII) and degenerated. A total of 427 oocytes were acquired, including 81, 109 and 237 that were graded as DI, DII and degenerated, respectively. Slicing yielded no OCS from animals < 2 months of age. In senile (> 9 years) bitches, bitches, there were more oocytes per bitch, compared to adult (2-6.5 years) bitches, but fewer DI oocytes, and more DII and degenerate oocytes. We inferred that using donors that were post-pubertal but not senile, would assure the recovery of high-quality oocytes by the slicing method. Additional studies are required to assess the quality of oocytes collected from pre-pubertal versus post-pubertal bitches < 2 years of age.
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Affiliation(s)
- A A Rocha
- Laboratório de Melhoramento Genético Animal, Universidade Estadual do Norte Fluminense, Avenida Alberto Lamego, 2000 Horto, Campos dos Goytacazes, Rio de Janeiro, Cep. 28013-602, RJ, Brazil
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Abstract
Several reports have suggested that a treatment before in vitro maturation might improve oocyte competence and increase its developmental potential. Therefore, the objectives of the present study were to establish the kinetics of IVM in Zebu oocytes, to assess the effect of 6-dimethylaminopurine (6-DMAP), a phosphorylation inhibitor, on meiotic resumption, and to verify the developmental potential of the blocked oocytes after removal of the inhibitory conditions. To establish the kinetics of in vitro maturation 1422 oocytes were obtained from Nellore cows ovaries and matured in presence and absence of gonadotropins. Samples of oocytes were taken from culture at 0, 6, 9, 12, 15, 18, 21 and 24h, and the oocytes were fixed, stained and evaluated for nuclear morphology. Germinal vesicle break down (GVBD) occurred between 6 and 12h of culture in both groups. By 21h the majority of the oocytes had reached metaphase II in presence (71%) and absence (62%) of gonadotropins. In order to examine the inhibitory effect of 6-DMAP, 585 oocytes were cultured for 12, 18 and 24h in the presence or absence of 2mM of 6-DMAP. At each time point the oocytes were evaluated for nuclear morphology. To test the reversibility of meiotic inhibition 366 oocytes were incubated for 0, 12, 18 and 24h in the presence of 6-DMAP and then were transferred to the maturation medium and cultured for further 24h. A total of 429 oocytes were used to evaluate the developmental potential after meiotic inhibition. The oocytes were cultured in the presence of 6-DMAP for 0, 12, 18 and 24h, and then were matured, fertilized and cultured in vitro. Culture of bovine oocytes in the presence of 6-DMAP up to 24h completely blocked GVBD with more than 90% of the oocytes at GV stage. The inhibitory effect of 6-DMAP was fully reversible since maturation rates were similar (P>0.05) among all treatment groups. The evaluation of embryo development after various periods of meiotic blockage showed that inhibition, regardless the time period, had no effect (P>0.05) on penetration and cleavage rates. However, the proportion of embryos at blastocyst stage was reduced after inhibition for 12 (20.2%), 18 (20.1%) and 24h (19.0%) compared with the control group (35.6%). 6-DMAP has a reversible effect on maintenance of meiotic arrest, but reduced further embryo development.
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Affiliation(s)
- M A Dode
- Embrapa Gado de Corte, Rodovia BR 262 km 4, Caixa Postal 154, CEP, Campo Grande, MS, Brazil.
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