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Raza SHA, Abd El-Aziz AH, Abdelnour SA, Easa AA, Alagawany M, Farag MR, Al-Mutary MG, Elfadadny A, Khan R, Quan G, Cheng G, Zan L. The role of forskolin as a lipolytic stimulator during in vitro oocyte maturation and the in vitro embryo production of livestock. Reprod Domest Anim 2021; 56:1486-1496. [PMID: 34592022 DOI: 10.1111/rda.14021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 09/28/2021] [Indexed: 11/28/2022]
Abstract
Cryopreservation is a modern technique which assists in the preservation of genetic material from oocytes and embryos for a long time. However, elevated vulnerability to cryopreservation due to the large accumulation of intracellular lipids within oocytes or embryos avoids success of this method. These lipids remain the main crucial factor limiting survival rates of oocytes and embryos after thawing. Lipid ingathering in the oocyte cytoplasm augments lipid peroxidation (LPO) and oxidative stress increases the apoptosis process, declines the viability after thawing, declines cytoskeleton actin filament injuries, lowers the blastocyst rates and reduces cryotolerance in the early stages of embryo development. There have been several attempts to reduce the ingathering of intracellular lipids in oocytes or embryos during the cryopreservation process, in that way enhancing the competence of cryopreserved oocytes or embryos and increasing their viability. One of the most applied agents for chemical delipidation is forskolin. Forskolin exhibited a possible part in improving the oocytes cryopreservation through stimulating cyclic adenosine monophosphate (cAMP) production. The main purpose of cAMP modulation is to provide energy to sustain the mammalian oocytes´ meiotic arrest. The purpose of the existing article is to assess and offer more evidence concerning the forskolin utilization as a modulator of cAMP during the cryopreservation of oocytes and its influence on meiosis completion and the reorganization of cytoplasm, which are prerequisites for the development of oocytes in addition to the contribution to fertilization and subsequently, the development of embryos.
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Affiliation(s)
- Sayed Haidar Abbas Raza
- College of Animal Science and Technology, Northwest A&F University, Yangling, China.,National Beef Cattle Improvement Center, Northwest A&F University, Yangling, China
| | - Ayman H Abd El-Aziz
- Animal Husbandry and Animal Wealth Development Department, Faculty of Veterinary Medicine, Daman Hour University, Damanhour, Egypt
| | - Sameh A Abdelnour
- Animal Production Department, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - Ahmed A Easa
- Department of Animal and Poultry Production, Faculty of Agriculture, Damanhour University, Damanhour, Egypt
| | - Mahmoud Alagawany
- Department of Poultry, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - Mayada R Farag
- Forensic Medicine and Toxicology Department, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - Mohsen G Al-Mutary
- Department of Basic Sciences, College of Education, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Ahmed Elfadadny
- Department of Animal Medicine, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt
| | - Rajwali Khan
- Department of Livestock Management, Breeding and Genetics, The University of Agriculture Peshawar, Peshawar, Pakistan
| | - Guobo Quan
- Yunnan Animal Science and Veterinary Institute, Kunming, China
| | - Gong Cheng
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Linsen Zan
- College of Animal Science and Technology, Northwest A&F University, Yangling, China.,National Beef Cattle Improvement Center, Northwest A&F University, Yangling, China
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Production of in vitro bovine embryos supplemented with l-carnitine in different oxygen tensions and the relation to nitric oxide. ZYGOTE 2020. [DOI: 10.1017/s0967199420000258] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
SummaryThe aim of this study was to evaluate the production of bovine embryos in vitro when supplemented with l-carnitine for 24 h beginning on day 5 (d 5) under two different oxygen tensions (20% or 5%) and the relationship of nitric oxide (NO) in in vitro culture (IVC) medium to embryo development. Cumulus–oocyte complexes (COC; n = 837) were matured in vitro for 24 h and fertilization was performed for 18 h. Zygotes were cultured in vitro for 9 days after in vitro fertilization in synthetic oviductal fluid (SOF) medium with 5% fetal calf serum. At d 5 the plates were assigned to one of four treatment groups: high (20%) or low (5%) O2 tension either with or without the addition of 3.03 mM l-carnitine (High-Cont, High-Lcar, Low-Cont, Low-Lcar). The concentration of NO in the culture medium was evaluated on d 5, d 6 and d 9. On d 7, parts of the embryos were submitted for evaluation of intracellular lipid droplets. The cleavage rate was similar (P > 0.05) between high and low O2 tension and the blastocyst rate was similar in all conditions evaluated. The hatching rate was higher (P < 0.05) for Low-Cont. The NO concentration was higher at d 9 under low O2 tension (P < 0.1). The addition of 3.03 mM l-carnitine between d 5 and d 6 of IVC was not efficient in reducing cytoplasmic lipid content of bovine embryos. Additionally, IVC at a low oxygen tension without l-carnitine promoted better conditions for embryo development. A higher concentration of NO in medium was observed under low O2 tension.
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Sánchez-Ajofrín I, Iniesta-Cuerda M, Sánchez-Calabuig MJ, Peris-Frau P, Martín-Maestro A, Ortiz JA, Del Rocío Fernández-Santos M, Garde JJ, Gutiérrez-Adán A, Soler AJ. Oxygen tension during in vitro oocyte maturation and fertilization affects embryo quality in sheep and deer. Anim Reprod Sci 2020; 213:106279. [PMID: 31987329 DOI: 10.1016/j.anireprosci.2020.106279] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Revised: 12/20/2019] [Accepted: 01/09/2020] [Indexed: 01/13/2023]
Abstract
Incubation gas atmosphere affects the development of in vitro produced embryos. In this study, there was examination of effects of two different oxygen (O2) tensions (5 % and 21 %) during in vitro maturation (M5 and M21) and/or fertilization (F5 and F21) on embryo production and quality in deer and sheep. There was assessment of the percentage of embryos with cell cleavage occurring, percentage that developed to the blastocyst stage, and analysis of the relative abundance of mRNA transcript for genes important for development to the blastocyst stage. The O2 tension treatment did not affect (P > 0.05) percentage cleavage or blastocyst development in either species. In sheep, there was a greater abundance of SHC1, GPX1, TP53, BAX and NRF1 mRNA transcript (P < 0.05) in M21 F5-derived embryos. In deer, there was a greater abundance of SOD2 mRNA transcript (P < 0.05) when oocytes had been matured under relatively lesser O2, regardless of the tension used during fertilization. There was a lesser abundance of SOX2 mRNA transcript (P < 0.05) in the M5F21 compared to the other three treatment groups. The AKR1B1 mRNA transcript was in greater abundance (P < 0.05) in M21 F21 as compared to M21 F5 and M5F21 group, and there was a greater abundance PLAC8 mRNA transcript (P < 0.05) in M21 F21, as compared to all other treatment groups. In conclusion, while O2 tension had no effect on developmental rates it did affect the relative abundance of mRNA transcript of multiple genes related to important cell functions during development.
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Freitas DS, Lopes GADG, Nascimento BR, Pereira LAAC, Batista RITP, Campos Junior PHA. Conjugated linoleic acid as a potential bioactive molecule to modulates gamete and embryo cryotolerance. CIÊNCIA ANIMAL BRASILEIRA 2020. [DOI: 10.1590/1809-6891v21e-63574] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Abstract Conjugated linoleic acid (CLA) is a mixture of positional isomers of linoleic acid found in meat and dairy products from ruminants. It is a trans fat widely used by athletes as a food supplement, due to a supposed effect of maximizing the use of body fat reserves. The interest in diet and culture media supplementation with CLA is an emerging area, demanding studies in order to elucidate its benefits in the reproductive parameters, as well as in cryopreservation. Therefore, the aim of this review was to discuss the effects of CLA on the oocytes, sperm and embryos cryotolerance. Some studies have already demonstrated its use in cryopreservation of germline. Among those, it was observed that CLA supplementation during oocyte in vitro maturation can increase their viability post-freezing and developmental capacity. Regarding the use of CLA on sperm, there are few studies and their results are still inconclusive. Finally, studies about CLA supplementation on embryo culture media have shown promising results, indicating that this bioactive molecule is able to modulate lipid uptake on blastomeres. Altogether, these findings demonstrate the potential use of CLA as a bioactive molecule to improve germline and embryo cryotolerance and open new perspectives on human and animal reproduction field.
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Meneghel M, Dall’Acqua PC, Ambrogi M, Leão BC, Rocha-Frigoni NA, Mingoti GZ. Lipid content and cryotolerance of in vitro-produced bovine embryos treated with forskolin before vitrification. PESQUISA VETERINARIA BRASILEIRA 2017. [DOI: 10.1590/s0100-736x2017000400015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
ABSTRACT: The aim of the present study was to evaluate the intracytoplasmic lipid content, development and cryotolerance of in vitro-produced bovine embryos treated with different concentrations of forskolin before vitrification. Embryos were produced from abattoir-derived ovaries and allocated into four groups. In the treatment groups, forskolin was added to the in vitro culture medium on Day 6 and incubated for 24 hours in one of the following concentrations: 2.5μM (Forsk 2.5 group), 5.0μM (Forsk 5.0 group) or 10.0μM (Forsk 10.0 group). Embryos from the control group were cultured without forskolin. On Day 7 of culture, the expanded blastocysts were stained with the lipophilic dye Sudan Black B for determination of the intracytoplasmic lipid content or were cryopreserved via the Vitri-Ingá® procedure. Although there were no significant differences (P>0.05) in the blastocyst rates between the Control group (44.9%) and the other treatments, the embryo production was lower (P<0.05) in Forsk 10.0 group (38.8%) compared to Forsk 2.5 (50.5%) and Forsk 5.0 (54.7%) groups. The intracytoplasmic lipid content (expressed in arbitrary units of pixels) in blastocysts from the Control group (1.00±0.03) was similar (P>0.05) to that found in Forsk 2.5 (0.92±0.03) and Forsk 10.0 groups (1.06±0.03) groups; however the lipid accumulation in blastocysts from Forsk 5.0 group (0.82±0.04) was lower than in the Control group (P<0.05). Based on these results, Forsk 5.0 treatment was tested for cryotolerance and it was observed that the blastocoel re-expansion rate evaluated 24 hours after warming was greater (P<0.05) in Forsk 5.0 group (72.2%) compared to the Control group (46.2%). In conclusion, pre-treatment with forskolin at a concentration of 5.0 μM for 24 hours before vitrification is effective in reducing the intracytoplasmic lipid content and, consequently, improves cryotolerance of IVP bovine embryos.
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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] [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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Improving the cytoplasmic maturation of bovine oocytes matured in vitro with intracellular and/or extracellular antioxidants is not associated with increased rates of embryo development. Theriogenology 2016; 86:1897-905. [DOI: 10.1016/j.theriogenology.2016.06.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 06/02/2016] [Accepted: 06/05/2016] [Indexed: 11/19/2022]
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Hosoe M, Inaba Y, Hashiyada Y, Imai K, Kajitani K, Hasegawa Y, Irie M, Teramoto H, Takahashi T, Niimura S. Effect of supplemented sericin on the development, cell number, cryosurvival and number of lipid droplets in cultured bovine embryos. Anim Sci J 2016; 88:241-247. [PMID: 27255434 DOI: 10.1111/asj.12628] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2015] [Revised: 01/24/2016] [Accepted: 02/07/2016] [Indexed: 11/30/2022]
Abstract
Sericin was investigated as an alternative to fetal bovine serum (FBS) for bovine embryo culture. In vitro matured oocytes were developed using 0.05%, 0.1% or 0.15% sericin. The developmental rate, cryosurvival rate and blastulation time of these embryos were compared with those of embryos developed using 5% FBS. The number of lipid droplets was compared among the blastocysts developed using 5% FBS, using 0.05% sericin and in vivo. The rate of cleavage and blastocyst formation was similar among all groups. Blastulation occurred significantly earlier in the embryos developed using 5% FBS than in those developed using sericin at any concentration (P < 0.05). At 72 h after thawing, the cryosurvival rate of the blastocysts developed using 5% FBS and 0.05% sericin were significantly higher compared with those developed using 0.1% and 0.15% sericin (P < 0.05). The blastocysts developed using 0.05% sericin and in vivo produced a significantly fewer number of medium and large lipid droplets than those developed using 5% FBS. These results suggest that the blastocysts developed using 0.05% sericin show characteristics similar to those of the blastocysts developed in vivo and that the use of sericin as an alternative to FBS is feasible.
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Affiliation(s)
- Misa Hosoe
- National Institute of Agrobiological Sciences, Tsukuba, Ibaraki, Japan
| | - Yasushi Inaba
- National Livestock Breeding Center, Kato, Hokkaido, Japan
| | | | - Kei Imai
- Department of Sustainable Agriculture, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan
| | - Kenji Kajitani
- National Institute of Livestock and Glassland Science, Tsukuba, Ibaraki, Japan
| | - Yuichi Hasegawa
- National Institute of Livestock and Glassland Science, Tsukuba, Ibaraki, Japan
| | - Mamoru Irie
- National Institute of Livestock and Glassland Science, Tsukuba, Ibaraki, Japan
| | | | - Toru Takahashi
- Faculty of Agriculture, Iwate University, Morioka, Iwate, Japan
| | - Sueo Niimura
- Faculty of Agriculture, Niigata University, Niigata, Japan
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Leão B, Rocha-Frigoni N, Cabral E, Coelho M, Ferreira C, Eberlin M, Accorsi M, Nogueira É, Mingoti G. Improved embryonic cryosurvival observed after in vitro supplementation with conjugated linoleic acid is related to changes in the membrane lipid profile. Theriogenology 2015; 84:127-36. [DOI: 10.1016/j.theriogenology.2015.02.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Revised: 02/27/2015] [Accepted: 02/28/2015] [Indexed: 11/27/2022]
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Thompson JG, Brown HM, Kind KL, Russell DL. The Ovarian Antral Follicle: Living on the Edge of Hypoxia or Not?1. Biol Reprod 2015; 92:153. [DOI: 10.1095/biolreprod.115.128660] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Accepted: 04/22/2015] [Indexed: 11/01/2022] Open
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Effects of gaseous atmosphere and antioxidants on the development and cryotolerance of bovine embryos at different periods of in vitro culture. ZYGOTE 2013; 23:159-68. [PMID: 24040954 DOI: 10.1017/s0967199413000361] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
This study examined the effects of antioxidant supplementation and O2 tension on embryo development, cryotolerance and intracellular reactive oxygen species (ROS) levels. The antioxidant supplementation consisted of 0.6 mM cysteine (CYST); 0.6 mM cysteine + 100 μM cysteamine (C+C); 100 IU catalase (CAT) or 100 μM β-mercaptoethanol (β-ME) for 3 or 7 days of in vitro culture (IVC). Two O2 tensions (20% O2 [5% CO2 in air] or 7% O2, 5% CO2 and 88% N2 [gaseous mixture]) were examined. After 7 days of antioxidant supplementation, the blastocyst frequencies were adversely affected (P < 0.05) by CYST (11.2%) and C+C (1.44%), as well as by low O2 tension (17.2% and 11.11% for 20% and 7% O2, respectively) compared with the control (26.6%). The blastocyst re-expansion rates were not affected (P > 0.05) by the treatments (range, 66-100%). After 3 days of antioxidant supplementation, the blastocyst frequencies were not affected (P > 0.05) by any of the antioxidants (range, 43.6-48.5%), but they were reduced by low O2 tension (P < 0.05) (52.1% and 38.4% for 20% and 7% O2, respectively). The intracellular ROS levels, demonstrated as arbitrary fluorescence units, were not affected (P > 0.05) by antioxidant treatment (range, 0.78 to 0.95) or by O2 tension (0.86 and 0.88 for 20% and 7% O2, respectively). The re-expansion rates were not affected (P > 0.05) by any of the treatments (range, 63.6-93.3%). In conclusion, intracellular antioxidant supplementation and low O2 tension throughout the entire IVC period were deleterious to embryo development. However, antioxidant supplementation up to day 3 of IVC did not affect the blastocyst frequencies or intracellular ROS levels.
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Carreira JT, Mingoti GZ, Rodrigues LH, Silva C, Perri SHV, Koivisto MB. Impact of proximal cytoplasmic droplets on quality traits and in-vitro embryo production efficiency of cryopreserved bull spermatozoa. Acta Vet Scand 2012; 54:1. [PMID: 22240071 PMCID: PMC3292455 DOI: 10.1186/1751-0147-54-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Accepted: 01/12/2012] [Indexed: 11/28/2022] Open
Abstract
Background Proximal cytoplasmic droplets (PCDs), a remnant of germ cell cytoplasm, are common non-specific morphological defects in bovine semen. This study evaluated the effect of higher percentages of PCDs on the quality of frozen-thawed bovine semen, embryo production and early embryo development. Methods Three ejaculates from each of five (group 1: PCD ≤ 1%, control) and eight adult Bos indicus bulls (group 2: PCD ≥ 24%) were analysed. Semen samples were examined for: post-thaw motility, vigour of movement, concentration, sperm morphology, slow thermoresistance test (STT), membrane integrity, acrosome status, mitochondrial function using fluorescent probes association (FITC-PSA, PI and JC-1) and sperm chromatin integrity using acridine orange assay. Two bulls from group 2, with 28.5% and 48.5% PCD, respectively, and three bulls from the control group, each with 0% PCD, were selected for IVF (in vitro fertilisation). Results Semen analyses revealed a significant correlation (P < 0.01) between increased rates of PCD and sperm quality traits. Nevertheless, no differences were observed in sperm motility and vigour either before or after the STT or in the percentage of intact acrosomes (analysed by differential interference contrast microscopy (DIC) after STT), but membrane integrity, acrosome status (evaluated with FITC-PSA staining method after thawing) and mitochondrial function were reduced, when compared with group 1 (P < 0.05). The higher incidence of PCD was positively correlated to chromatin damage, especially after three hours of incubation at 37°C. IVF showed similar results for bull C2 (group 1, control) and bull P2 (group 2, group with higher PCDs). Conclusion Higher PCD levels influenced spermatozoa quality traits. IVF and embryo development data showed that cleavage, blastocyst formation and blastocyst hatching may have been influenced by the interaction of morphology traits and individual bull effects.
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Gomes Sobrinho DB, Oliveira JBA, Petersen CG, Mauri AL, Silva LFI, Massaro FC, Baruffi RLR, Cavagna M, Franco JG. IVF/ICSI outcomes after culture of human embryos at low oxygen tension: a meta-analysis. Reprod Biol Endocrinol 2011; 9:143. [PMID: 22044493 PMCID: PMC3229451 DOI: 10.1186/1477-7827-9-143] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Accepted: 11/01/2011] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Improved pregnancy, implantation, and birth rates have been reported after the use of reduced O2 concentration during embryo culture, mainly due to a reduction of the cumulative detrimental effects of reactive oxygen species. However, some studies have failed to report any positive effects. The objective of this meta-analysis was to evaluate the effect of a low-O2 environment on IVF/intracytoplasmic sperm injection (ICSI) outcomes. METHODS All available published and ongoing randomised trials that compared the effects of low (~5%; OC~5) and atmospheric (~20%; OC~20) oxygen concentrations on IVF/ICSI outcomes were included. Search strategies included online surveys of databases from 1980 to 2011. The outcomes measured were fertilisation rate, implantation rate and ongoing pregnancy rates. The fixed effects model was used to calculate the odds ratio. RESULTS Seven studies were included in this analysis. The pooled fertilisation rate did not differ significantly (P=0.54) between the group of oocytes cultured at low O2 tension and the group at atmospheric O2 tension. Concerning all cycles, the implantation (P=0.06) and ongoing pregnancy (P=0.051) rates were not significantly different between the group receiving transferred sets containing only OC~5 embryos and the group receiving transferred sets with only OC~20 embryos. In a meta-analysis performed for only those trials in which embryos were transferred on day 2/3, implantation (P=0.63) and ongoing pregnancy (P=0.19) rates were not significantly different between the groups. In contrast, when a meta-analysis was performed using only trials in which embryos were transferred on days 5 and 6 (at the blastocyst stage), the group with transferred sets of only OC~5 embryos showed a statistically significantly higher implantation rate (P=0.006) than the group receiving transferred sets with only OC~20 embryos, although the ongoing pregnancy (P=0.19) rates were not significantly different between the groups. CONCLUSIONS Despite some promising results, it seems too early to conclude that low O2 culture has an effect on IVF outcome. Additional randomised controlled trials are necessary before evidence-based recommendations can be provided. It should be emphasised that the present meta-analysis does not provide any evidence that low oxygen concentration is unnecessary.
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Affiliation(s)
- David B Gomes Sobrinho
- Department of Gynaecology and Obstetrics, Botucatu Medical School, São Paulo State University - UNESP, Botucatu, Brazil
| | - Joao Batista A Oliveira
- Department of Gynaecology and Obstetrics, Botucatu Medical School, São Paulo State University - UNESP, Botucatu, Brazil
- Center for Human Reproduction Prof Franco Jr, Ribeirao Preto, Brazil
- Paulista Centre for Diagnosis, Research and Training, Ribeirao Preto, Brazil
| | - Claudia G Petersen
- Department of Gynaecology and Obstetrics, Botucatu Medical School, São Paulo State University - UNESP, Botucatu, Brazil
- Center for Human Reproduction Prof Franco Jr, Ribeirao Preto, Brazil
- Paulista Centre for Diagnosis, Research and Training, Ribeirao Preto, Brazil
| | - Ana L Mauri
- Center for Human Reproduction Prof Franco Jr, Ribeirao Preto, Brazil
- Paulista Centre for Diagnosis, Research and Training, Ribeirao Preto, Brazil
| | - Liliane FI Silva
- Department of Gynaecology and Obstetrics, Botucatu Medical School, São Paulo State University - UNESP, Botucatu, Brazil
- Center for Human Reproduction Prof Franco Jr, Ribeirao Preto, Brazil
- Paulista Centre for Diagnosis, Research and Training, Ribeirao Preto, Brazil
| | - Fabiana C Massaro
- Center for Human Reproduction Prof Franco Jr, Ribeirao Preto, Brazil
- Paulista Centre for Diagnosis, Research and Training, Ribeirao Preto, Brazil
| | - Ricardo LR Baruffi
- Center for Human Reproduction Prof Franco Jr, Ribeirao Preto, Brazil
- Paulista Centre for Diagnosis, Research and Training, Ribeirao Preto, Brazil
| | - Mario Cavagna
- Center for Human Reproduction Prof Franco Jr, Ribeirao Preto, Brazil
- Paulista Centre for Diagnosis, Research and Training, Ribeirao Preto, Brazil
- Women's Health Reference Center, Hospital Perola Byington, Sao Paulo, Brazil
| | - José G Franco
- Department of Gynaecology and Obstetrics, Botucatu Medical School, São Paulo State University - UNESP, Botucatu, Brazil
- Center for Human Reproduction Prof Franco Jr, Ribeirao Preto, Brazil
- Paulista Centre for Diagnosis, Research and Training, Ribeirao Preto, Brazil
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Deleuze S, Goudet G. Cysteamine Supplementation ofIn vitroMaturation Media: A Review. Reprod Domest Anim 2010; 45:e476-82. [DOI: 10.1111/j.1439-0531.2010.01587.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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15
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Pereira MM, Machado MA, Costa FQ, Serapiao RV, Viana JHM, Camargo LSA. Effect of oxygen tension and serum during IVM on developmental competence of bovine oocytes. Reprod Fertil Dev 2010; 22:1074-82. [DOI: 10.1071/rd10007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2010] [Accepted: 02/10/2010] [Indexed: 11/23/2022] Open
Abstract
With an aim to improve the in vitro production of bovine embryos, the present study investigated the effect of serum and oxygen tension during IVM on oocyte developmental competence. Four experimental groups were evaluated: G1, 10% oestrus cow serum (OCS) with 20% O2; G2, 0.1% polyvinyl alcohol (PVA) with 20% O2; G3, 10% OCS with 5% O2; and G4, 0.1% PVA with 5% O2. The proportion of MII oocytes, blastocyst rates and total cell number were not affected (P > 0.05) when the OCS was replaced with PVA under 5% O2, whereas a higher (P < 0.05) blastocyst rate and total cell number were found with OCS compared with PVA under 20% O2. The apoptosis index was lower in blastocysts from oocytes matured with PVA under 5% O2 (G4) compared with other groups (G1, G2 and G3), but no differences (P > 0.05) were found in maturation and blastocyst rates. Significant differences were found in the amount of specific transcripts in oocytes matured under different conditions. In conclusion maturation with PVA and 5% O2 provides an efficient in vitro culture condition for the maturation of bovine oocytes.
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