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Diaz FA, Gutierrez EJ, Foster BA, Hardin PT, Bondioli KR. Effect of in vivo and in vitro heat stress on DNA methylation and DNA hydroxymethylation of bovine oocytes and early embryos. Theriogenology 2025; 240:117400. [PMID: 40184700 DOI: 10.1016/j.theriogenology.2025.117400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2024] [Revised: 03/22/2025] [Accepted: 03/23/2025] [Indexed: 04/07/2025]
Abstract
In the bovine commercial industry, reduced reproductive performance in response to heat stress is one of the main factors causing economic losses. Several studies have shown that heat stress negatively affects oocytes and embryos at the morphological, biochemical, transcriptional, and developmental levels. Yet, there is limited information on the effect of heat stress on the epigenetic modifications of bovine oocytes and embryos. Therefore, the objective of this study was to evaluate the effect of in vivo and in vitro heat stress on the developmental competence, DNA methylation, and DNA hydroxymethylation of bovine oocytes and early embryos. Oocytes were collected through ovum pick-up from non-lactating, non-pregnant Bos taurus beef cows in February and August under Louisiana environmental conditions. The treatments evaluated were: in vivo heat stress (oocytes collected in August), in vitro heat stress (oocytes collected in February and subjected to in vitro heat stress), and control (oocytes collected in February and not subjected to in vitro heat stress). Developmental rates, DNA methylation and DNA hydroxymethylation of metaphase II oocytes (MII), 2-pronucleus embryos (2 PN) and 2-4 cell embryos were evaluated. Global DNA methylation and DNA hydroxymethylation were evaluated through fluorescence immunostaining. No differences between treatments was detected in developmental rates of MII oocytes, 2 PN embryos and 2-4 cell embryos. Similarly, no differences between treatments was detected in global DNA methylation and DNA hydroxymethylation of MII oocytes, 2 PN embryos, and 2-4 cell embryos. Importantly, no differences in global DNA methylation or DNA hydroxymethylation of paternal or maternal pronucleus was detected, indicating that the demethylation process during the 2 PN embryo stage was not altered at the global level. The results of our study showed that under our experimental conditions, in vivo and in vitro heat stress did not affect developmental rates, DNA methylation and DNA hydroxymethylation of MII oocytes and early embryos produced from oocytes obtained from non-lactating, non-pregnant Bos taurus beef cows.
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Affiliation(s)
- F A Diaz
- School of Animal Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA, USA.
| | - E J Gutierrez
- School of Animal Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA, USA
| | - B A Foster
- School of Animal Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA, USA
| | - P T Hardin
- School of Animal Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA, USA
| | - K R Bondioli
- School of Animal Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA, USA
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2
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Yousefian I, Zare-Shahneh A, Goodarzi A, Baghshahi H, Fouladi-Nashta AA. The effect of Tempo and MitoTEMPO on oocyte maturation and subsequent embryo development in bovine model. Theriogenology 2021; 176:128-136. [PMID: 34607131 DOI: 10.1016/j.theriogenology.2021.09.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 09/17/2021] [Accepted: 09/18/2021] [Indexed: 12/26/2022]
Abstract
Reactive oxygen species (ROS) are one of the factors which reduces oocyte quality and viability of the in vitro produced embryos. Oocyte mitochondria are the major source of ROS production, hence, and the addition of mitochondrion-specific antioxidants could be suggested to minimize the damage caused by ROS during culture. MitoTEMPO, a targeted mitochondrial antioxidant, is formed by conjugating TEMPO to triphenylphosphonium and has an activity like that of superoxide dismutase. It can pass through lipid bilayers easily and accumulate selectively in mitochondria. The goal of this study was to investigate the effects of MitoTEMPO and its non-targeted form, TEMPO, on the developmental competence of bovine oocytes. Accordingly, oocytes were cultured in maturation medium supplemented with either five mM TEMPO (T5) or one μM MitoTEMPO (M1), or T5 + M1 (MT15), or without the antioxidants (C). Nuclear maturation to metaphase II (MII) stage, intracellular glutathione (GSH) content and ROS levels in matured oocytes were analyzed. In addition, cleavage after in vitro fertilization, and blastocyst rates, total cell number in blastocysts as well as the relative abundance of apoptosis-related genes (BAX and BCL2) in blastocysts were determined. Results revealed that the proportion of oocytes at the MII stage, embryos at the blastocyst stage and total cell number in blastocysts increased significantly in the M1 group compared to the C and T5 groups. The levels of intracellular GSH and ROS in oocytes decreased in the M1 group than in the C group (P < 0.05). The expression level of the pro-apoptotic gene (BAX) reduced in blastocysts from the M1 group in comparison to the C and T5 groups (P < 0.05). On the other hand, the expression level of anti-apoptotic gene (BCL2) in obtained blastocysts was not affected by TEMPO and MitoTEMPO. However, the ratio of BAX/BCL2 in blastocysts from the M1 and MT15 groups decreased significantly compared to the C group. These findings suggest that MitoTEMPO can mitigate the adverse effects of oxidative stress on the developmental competence of bovine oocytes.
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Affiliation(s)
- I Yousefian
- Department of Animal Science, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
| | - A Zare-Shahneh
- Department of Animal Science, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.
| | - A Goodarzi
- Department of Animal Science, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
| | - H Baghshahi
- Department of Animal Science, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
| | - A A Fouladi-Nashta
- Department of Comparative Biomedical Sciences, The Royal Veterinary College, Hawkshead Campus, UK
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3
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Whitty A, Kind KL, Dunning KR, Thompson JG. Effect of oxygen and glucose availability during in vitro maturation of bovine oocytes on development and gene expression. J Assist Reprod Genet 2021; 38:1349-1362. [PMID: 34031767 DOI: 10.1007/s10815-021-02218-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Accepted: 05/02/2021] [Indexed: 01/19/2023] Open
Abstract
PURPOSE Oxygen tension during the in vitro maturation (IVM) of oocytes is important for oocyte developmental competence. A conflict exists in the literature as to whether low oxygen during IVM is detrimental or beneficial to the oocyte. Many research and clinical labs use higher than physiological oxygen tension perhaps believing that low-oxygen tension is detrimental to oocyte development. Other studies show that glucose is important if low-oxygen tension is used during maturation. In this study, we look at the link between low oxygen and glucose availability during IVM to resolve misconceptions around low-oxygen tension during IVM. METHODS Bovine cumulus oocyte complexes (COCs) were matured at 20% vs 7% oxygen in media containing differing glucose concentrations or varying availability. Cleavage and blastocyst rates were recorded. RT-PCR determined expression levels of metabolic, oxygen, and stress-responsive genes following IVM. RESULTS Embryo development in 7% oxygen groups with 2.3mM glucose/low glucose availability was lower than 20% oxygen groups. Under 7% oxygen with 5.6mM glucose or higher glucose availability, rates were restored to those seen in 20% oxygen. Expressions of BNIP3, ENO1, GAPDH, and SLC2A1, were upregulated in 7% oxygen/low glucose, compared to 20% oxygen groups. BNIP3 expression was higher in 7% oxygen group with low glucose availability compared to the 20% groups. CONCLUSION Oocyte developmental competence is negatively impacted following IVM in low oxygen when glucose availability is limited. Glucose concentration and physical culture conditions need to be considered when comparing the effects of different oxygen concentrations during IVM.
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Affiliation(s)
- Annie Whitty
- Robinson Research Institute, Adelaide Medical School, The University of Adelaide, Adelaide, South Australia, Australia
| | - Karen L Kind
- School of Animal and Veterinary Sciences, The University of Adelaide, Adelaide, South Australia, Australia
| | - Kylie R Dunning
- Robinson Research Institute, Adelaide Medical School, The University of Adelaide, Adelaide, South Australia, Australia. .,Australian Research Council Centre of Excellence for Nanoscale BioPhotonics, Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, South Australia, Australia. .,Adelaide Medical School, University of Adelaide, Level 2, Helen Mayo South Building, Frome Rd, Adelaide, 5005, Australia.
| | - Jeremy G Thompson
- Robinson Research Institute, Adelaide Medical School, The University of Adelaide, Adelaide, South Australia, Australia
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Rowinski JR, Rispoli LA, Payton RR, Schneider LG, Schrick FN, McLean KJ, Edwards JL. Impact of an acute heat shock during in vitro maturation on interleukin 6 and its associated receptor component transcripts in bovine cumulus-oocyte complexes. Anim Reprod 2021; 17:e20200221. [PMID: 33936291 PMCID: PMC8081495 DOI: 10.1590/1984-3143-ar2020-0221] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
An acute heat stress event after the LH surge increased interleukin 6 (IL6) levels in the follicular fluid of the ovulatory follicle in hyperthermic cows. To examine direct consequences of a physiologically-relevant elevated temperature (41.0°C) on the cumulus-oocyte complex (COC), IL6 transcript abundance and related receptor components were evaluated throughout in vitro maturation. Heat-induced increases in IL6 were first noted at 4 hours of in vitro maturation (hIVM); peak levels occurred at 4.67 versus 6.44 hIVM for 41.0 and 38.5°C COCs, respectively (SEM = 0.23; P < 0.001). Peak IL6ST levels occurred at 6.95 versus 8.29 hIVM for 41.0 and 38.5°C, respectively (SEM = 0.23; P < 0.01). Transcript for LIF differed over time (P < 0.0001) but was not affected by 41.0°C exposure. Blastocyst development after performing IVF was not affected by 41.0°C exposure for 4 or 6 h. When limiting analysis to when IL6 was temporally produced, progesterone levels were only impacted by time and temperature (no interaction). Heat-induced shift in the temporal production of IL6 and IL6ST along with its impact on progesterone likely cooperate in heat-induced hastening of meiotic progression described by others.
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Affiliation(s)
- Julia R Rowinski
- Department of Animal Science, The University of Tennessee, Institute of Agriculture, AgResearch, Knoxville, TN, USA
| | - Louisa A Rispoli
- Department of Animal Science, The University of Tennessee, Institute of Agriculture, AgResearch, Knoxville, TN, USA.,Cincinnati Zoo & Botanical Garden, Cincinnati, OH, USA
| | - Rebecca R Payton
- Department of Animal Science, The University of Tennessee, Institute of Agriculture, AgResearch, Knoxville, TN, USA
| | - Liesel G Schneider
- Department of Animal Science, The University of Tennessee, Institute of Agriculture, AgResearch, Knoxville, TN, USA
| | - F Neal Schrick
- Department of Animal Science, The University of Tennessee, Institute of Agriculture, AgResearch, Knoxville, TN, USA
| | - Kyle J McLean
- Department of Animal Science, The University of Tennessee, Institute of Agriculture, AgResearch, Knoxville, TN, USA
| | - J Lannett Edwards
- Department of Animal Science, The University of Tennessee, Institute of Agriculture, AgResearch, Knoxville, TN, USA
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Melatonin slightly alleviates the effect of heat shock on bovine oocytes and resulting blastocysts. Theriogenology 2020; 158:477-489. [PMID: 33080451 DOI: 10.1016/j.theriogenology.2020.09.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 08/17/2020] [Accepted: 09/29/2020] [Indexed: 12/20/2022]
Abstract
Heat stress is associated with increased production of reactive oxygen species (ROS) and disruption of bovine oocyte function. Here, we examined whether the antioxidant melatonin can alleviate the deleterious effects of heat stress on oocyte developmental competence. Cumulus-oocyte complexes were matured for 22 h at 38.5 °C (control) or for 22 h at 41.5 °C (heat shock) with or without 1.0 × 10-7 M melatonin. At the end of maturation, a subgroup of oocytes was examined for nuclear and cytoplasmic maturation, ROS level and mitochondrial membrane potential. A second subgroup of oocytes underwent fertilization (18 h), and putative zygotes were cultured in an incubator equipped with a time-lapse system for ∼190 h. Cleavage rate and the proportion of blastocysts, as well as embryo kinetics were recorded. Expanded blastocysts were collected and their transcript abundance was evaluated. Heat shock increased ROS and reduced the proportion of oocytes that resumed meiosis and reached the metaphase-II stage. Exposing oocytes to heat shock with melatonin alleviated these effects to some extent, expressed by a marginal reduction in ROS level and increased proportion of metaphase-II stage oocytes. Neither the distribution of oocyte cortical granules nor polarization of the mitochondrial membrane differed between control and heat-shocked oocytes cultured with or without melatonin. Heat shock reduced the proportion of embryos that cleaved and developed to blastocysts, characterized by alterations in kinetics of the developed embryos expressed by a delay in the first cleavage, second cleavage and blastocyst formation for heat-shock vs. control groups. Melatonin did not restore the competence or kinetics of embryos developed from heat-shocked oocytes. However, expanded blastocysts developed from heat-shocked oocytes treated with melatonin expressed a higher transcript abundance of genes associated with mitochondrial function, relative to the control and heat-shock group. In summary, melatonin improved the oxidative status of heat-shocked oocytes to some extent and had a beneficial effect on maternal mitochondrial transcripts in the developed blastocysts.
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Huang CH, Wang FT, Chan WH. Dose-dependent beneficial and harmful effects of berberine on mouse oocyte maturation and fertilization and fetal development. Toxicol Res (Camb) 2020; 9:431-443. [PMID: 32905254 DOI: 10.1093/toxres/tfaa043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2020] [Revised: 05/27/2020] [Accepted: 06/02/2020] [Indexed: 12/26/2022] Open
Abstract
Previous studies have shown that berberine, an isoquinoline alkaloid isolated from several traditional Chinese herbal medicines, suppresses growth and induces apoptosis in some tumor cell lines. It has also been shown that berberine possesses anti-atherosclerosis and antioxidant activities in hyperlipidemic model rats. Our previous study in mice found that berberine causes harmful effects on preimplantation and postimplantation embryonic development, both in vitro and in vivo, by triggering reactive oxygen species (ROS)-mediated apoptotic cascades in mouse blastocysts. In the current investigation, we further showed that berberine treatment has distinct dose-dependent effects on oocyte maturation and subsequent development. Preincubation of oocytes with 2.5 μM berberine significantly enhanced maturation and in vitro fertilization (IVF) rates, with subsequent beneficial effects on embryonic development. In contrast, preincubation with 10 μM berberine negatively impacted mouse oocyte maturation, decreased IVF rates and impaired subsequent embryonic development. Similar dose-dependent effects were also demonstrated in vivo. Specifically, intravenous injection of berberine significantly enhanced mouse oocyte maturation, IVF rate and early-stage embryo development after fertilization at a dose of 1 mg/kg body weight but significantly impaired oocyte maturation and IVF rates and caused harmful effects on early embryonic development at a dose of 5 mg/kg. Mechanistically, we found that berberine enhanced intracellular ROS production and apoptosis of oocytes at a concentration of 10 μM but actually significantly decreased total intracellular ROS content and had no apoptotic effect at a concentration of 2.5 μM. Moreover, pretreatment of oocytes with Ac-DEVD-cho, a caspase-3-specific inhibitor, effectively blocked berberine-induced negative impacts on oocyte maturation, fertilization and subsequent development. Collectively, these findings establish the dose-dependent beneficial versus deleterious effects of berberine and suggest that the mechanism underlying the deleterious effects of berberine involves a caspase-3-dependent apoptotic process acting downstream of an increase in intracellular ROS levels.
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Affiliation(s)
- Chien-Hsun Huang
- Department of Obstetrics and Gynecology, Taoyuan General Hospital, Ministry of Health & Welfare, hongshan Road, Taoyuan District, Taoyuan City 33004, Taiwan
| | - Fu-Ting Wang
- Rehabilitation and Technical Aid Center, Taipei Veterans General Hospital, Shipai Road, Beitou District, Taipei City 11217, Taiwan
| | - Wen-Hsiung Chan
- Department of Bioscience Technology, Center for Nanotechnology, Chung Yuan Christian University, Chung Li District, Taoyuan City 32023, Taiwan
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Huang CH, Wang FT, Chan WH. Dosage-related beneficial and deleterious effects of ginsenoside Rb1 on mouse oocyte maturation and fertilization and fetal development. ENVIRONMENTAL TOXICOLOGY 2019; 34:1001-1012. [PMID: 31112002 DOI: 10.1002/tox.22771] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 04/24/2019] [Accepted: 04/30/2019] [Indexed: 06/09/2023]
Abstract
Ginsenoside Rb1 (GRb1), the major saponin component of ginseng root, has a wide range of therapeutic applications for various diseases. Previously, our group showed that GRb1 triggers ROS-mediated apoptotic cascades in mouse blastocysts, leading to decreased cell viability and impairment of pre- and postimplantation embryonic development, both in vitro and in vivo. In this study, we further found that GRb1 exerted dose-dependent effects on oocyte maturation and sequent development in vitro. Oocytes preincubated with 25 μg/mL GRB1 displayed significantly enhanced maturation and in vitro fertilization (IVF) rates, along with progression of subsequent embryonic development. In contrast, treatment with 50 and 100 μg/mL GRB1 led to impairment of mouse oocyte maturation, decreased IVF rates, and injurious effects on subsequent embryonic development. In vivo, intravenous injection of 1 mg/kg body weight GRb1 significantly promoted mouse oocyte maturation, IVF, and early-stage embryo development after fertilization while administration of 5 mg/kg body weight GRb1 led to a marked decrease in oocyte maturation and IVF rates concomitant with impairment of early embryonic development in our animal model. In terms of the mechanisms underlying the regulatory effects of GRb1 demonstrated increased intracellular reactive oxygen species (ROS) production and apoptosis in the 100 μg/mL GRb1 treatment group. However, we observed a significant decrease in total intracellular ROS content and inhibition of apoptosis events in the 25 μg/mL GRb1 treatment group, signifying that the intracellular ROS content serves as a key upstream regulator of GRb1 that influences its dose-dependent beneficial or deleterious effects on oocyte maturation and sequent embryonic development. For further clarification of the mechanisms underlying GRb1-triggered injurious effects, oocytes were pretreated with Ac-DEVD-CHO, a caspase-3-specific inhibitor, which effectively blocked injury to oocyte maturation, fertilization, and sequent development. In sum, study findings highlight the potential involvement of p53-, p21-, and caspase-3-dependent regulatory signaling cascades in GRb1-mediated apoptotic processes.
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Affiliation(s)
- Chien-Hsun Huang
- Department of Obstetrics and Gynecology, Taoyuan General Hospital, Ministry of Health & Welfare, Taoyuan City, Taiwan
| | - Fu-Ting Wang
- Rehabilitation and Technical Aid Center, Taipei Veterans General Hospital, Taipei City, Taiwan
| | - Wen-Hsiung Chan
- Department of Bioscience Technology and Center for Nanotechnology, Chung Yuan Christian University, Taoyuan City, Taiwan
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Effects of melatonin on production of reactive oxygen species and developmental competence of bovine oocytes exposed to heat shock and oxidative stress during in vitro maturation. ZYGOTE 2019; 27:180-186. [PMID: 31171044 DOI: 10.1017/s0967199419000236] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
SummaryHeat shock may disrupt oocyte function by increasing the generation of reactive oxygen species (ROS). We evaluated the capacity of the antioxidant melatonin to protect oocytes using two models of oxidative stress - heat shock and the pro-oxidant menadione. Bovine cumulus-oocyte complexes (COC) were exposed in the presence or absence of 1 µM melatonin to the following treatments during maturation: 38.5°C, 41°C and 38.5°C+5 µM menadione. In the first experiment, COC were matured for 3 h with 5 µM CellROX® and analyzed by epifluorescence microscopy to quantify production of ROS. The intensity of ROS was greater for oocytes exposed to heat shock and menadione than for control oocytes. Melatonin reduced ROS intensity for heat-shocked oocytes and oocytes exposed to menadione, but not for control oocytes. In the second experiment, COC were matured for 22 h. After maturation, oocytes were fertilized and the embryos cultured for 7.5 days. The proportion of oocytes that cleaved after fertilization was lower for oocytes exposed to heat shock and menadione than for control oocytes. Melatonin increased cleavage for heat-shocked oocytes and oocytes exposed to menadione, but not for control oocytes. Melatonin tended to increase the developmental competence of embryos from heat-shocked oocytes but not for embryos from oocytes exposed to menadione or from control oocytes. In conclusion, melatonin reduced production of ROS of maturing oocytes and protected oocytes from deleterious effects of both stresses on competence of the oocyte to cleave after coincubation with sperm. These results suggest that excessive production of ROS compromises oocyte function.
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Rodrigues TA, Tuna KM, Alli AA, Tribulo P, Hansen PJ, Koh J, Paula-Lopes FF. Follicular fluid exosomes act on the bovine oocyte to improve oocyte competence to support development and survival to heat shock. Reprod Fertil Dev 2019; 31:888-897. [DOI: 10.1071/rd18450] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2018] [Accepted: 12/05/2018] [Indexed: 12/12/2022] Open
Abstract
Addition of follicular fluid to oocyte maturation medium can affect cumulus cell function, increase competence of the oocytes to be fertilised and develop to the blastocyst stage and protect the oocyte from heat shock. Here, it was tested whether exosomes in follicular fluid are responsible for the effects of follicular fluid on the function of the cumulus–oocyte complex (COC). This was accomplished by culturing COCs during oocyte maturation at 38.5°C (body temperature of the cow) or 41°C (heat shock) with follicular fluid or exosomes derived from follicular fluid and evaluating various aspects of function of the oocyte and the embryo derived from it. Negative effects of heat shock on cleavage and blastocyst development, but not cumulus expansion, were reduced by follicular fluid and exosomes. The results support the idea that exosomes in follicular fluid play important roles during oocyte maturation to enhance oocyte function and protect it from stress.
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Bennemann J, Grothmann H, Wrenzycki C. Reduced oxygen concentration during in vitro oocyte maturation alters global DNA methylation in the maternal pronucleus of subsequent zygotes in cattle. Mol Reprod Dev 2018; 85:849-857. [PMID: 30307668 DOI: 10.1002/mrd.23073] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Accepted: 10/10/2018] [Indexed: 12/14/2022]
Abstract
Preimplantation epigenetic reprogramming is sensitive to the environment of the gametes and the embryo. In vitro maturation (IVM) of bovine oocytes is a critical step of embryo in vitro production procedures and several factors influence its efficiency, including atmospheric oxygen tension. The possibility that the IVM environment can alter this process is tested by determining whether the global DNA methylation pattern (measured via immunofluorescent labeling of 5-methylcytosine [5meC]) in the parental pronuclei of bovine zygotes produced from cumulus-oocyte complexes matured under low (5%) and atmospheric (~20%) oxygen tension. Normalized 5meC signals differed significantly between maternal and paternal pronuclei of oocytes matured in vitro at 5% oxygen (p ≤ 0.05). There was a significant difference of 5meC between maternal pronuclei of oocytes matured at 5% oxygen and 20% oxygen ( p ≤ 0.05). The relative methylation level (normalized fluorescence intensity of paternal pronucleus divided by the normalized fluorescence intensity of maternal pronucleus) subsequent to maturation in vitro at 5% and 20% oxygen was also significantly altered ( p ≤ 0.05). Our results show that the pattern of global DNA methylation in the maternal pronucleus of bovine zygotes is affected by maturing the oocytes under low oxygen tension which may have an impact on early embryonic development. These data may contribute to the understanding of possible effects of IVM conditions on pronucleus reprogramming.
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Affiliation(s)
- Johanna Bennemann
- Clinic for Cattle, University of Veterinary Medicine Hannover (Foundation), Hannover, Germany.,Clinic for Veterinary Obstetrics, Gynecology and Andrology, Chair for Molecular Reproductive Medicine, Justus-Liebig-University Giessen, Giessen, Germany
| | - Hanna Grothmann
- Clinic for Veterinary Obstetrics, Gynecology and Andrology, Chair for Molecular Reproductive Medicine, Justus-Liebig-University Giessen, Giessen, Germany
| | - Christine Wrenzycki
- Clinic for Veterinary Obstetrics, Gynecology and Andrology, Chair for Molecular Reproductive Medicine, Justus-Liebig-University Giessen, Giessen, Germany
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Huang CH, Yeh JM, Chan WH. Hazardous impacts of silver nanoparticles on mouse oocyte maturation and fertilization and fetal development through induction of apoptotic processes. ENVIRONMENTAL TOXICOLOGY 2018; 33:1039-1049. [PMID: 29964317 DOI: 10.1002/tox.22590] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 06/01/2018] [Accepted: 06/04/2018] [Indexed: 06/08/2023]
Abstract
Silver nanoparticles (AgNPs) are antibacterial materials widely used in numerous products and medical supplies. Previously, we showed that AgNPs trigger apoptotic processes in mouse blastocysts, leading to a decrease in cell viability and impairment of preimplantation and postimplantation embryonic development in vitro and in vivo. In the present study, we further investigated the hazardous effects of AgNPs on mouse oocyte maturation, in vitro fertilization (IVF), and subsequent preimplantation and postimplantation development in vitro and in vivo. Data from in vitro experiments revealed that AgNPs impair mouse oocyte maturation, decrease IVF rates, and induce injury effects on subsequent embryonic development to a significant extent. In an animal model, intravenous injection of AgNPs (5 mg/kg body weight) led to a significant decrease in mouse oocyte maturation and IVF concomitant with impairment of early embryonic development in vivo. Importantly, pretreatment with N-acetylcysteine effectively prevented AgNP-triggered reactive oxygen species (ROS) production and apoptosis, clearly suggesting a critical role of ROS as an upstream initiator or key regulator of AgNP-induced hazardous effects on oocyte maturation and sequent embryonic development. Furthermore, preincubation of oocytes with Ac-DEVD-cho, a caspase-3-specific inhibitor, effectively prevented hazardous effects, highlighting the potential involvement of caspase-dependent apoptotic signaling cascades in AgNP-mediated events. Expression levels of p53 and p21 of blastocysts were upregulated upon preincubation of mouse oocytes with AgNPs. Our collective results imply that cell apoptosis in mouse blastocysts derived from the AgNP-pretreated oocytes via intracellular ROS generation, which is further mediated through p53-, p21-, and caspase-3-dependent regulatory mechanisms.
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Affiliation(s)
- Chien-Hsun Huang
- Department of Obstetrics and Gynecology, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan City, Taiwan
| | - Jui-Ming Yeh
- Department of Chemistry and Center for Nanotechnology, Chung Yuan Christian University, Taoyuan City, Taiwan
| | - Wen-Hsiung Chan
- Department of Bioscience Technology and Center for Nanotechnology, Chung Yuan Christian University, Taoyuan City, Taiwan
- Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
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12
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Huang FJ, Chan WH. Effects of ochratoxin a on mouse oocyte maturation and fertilization, and apoptosis during fetal development. ENVIRONMENTAL TOXICOLOGY 2016; 31:724-735. [PMID: 25504763 DOI: 10.1002/tox.22085] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Revised: 11/15/2014] [Accepted: 11/17/2014] [Indexed: 06/04/2023]
Abstract
We previously reported that ochratoxin A (OTA), a mycotoxin found in many foods worldwide, causes nephrotoxicity, hepatotoxicity, and immunotoxicity, and is a risk factor for abnormal embryonic development. More specifically, OTA triggers apoptotic processes in the inner cell mass of mouse blastocysts, decreasing cell viability and embryonic development. In the current study, we investigated the deleterious effects of OTA on mouse oocyte maturation, in vitro fertilization (IVF), and subsequent pre- and postimplantation development both in vitro and in vivo. Notably, OTA significantly impaired mouse oocyte maturation, decreased IVF rates, and inhibited subsequent embryonic development in vitro. Preincubation of oocytes with OTA during in vitro maturation increased postimplantation embryonic resorption and decreased mouse fetal weight. In an in vivo animal model, provision of 1-10 μM OTA in the drinking water or intravenous injection of 1 or 2 mg/kg body weight of OTA decreased oocyte maturation and IVF, and had deleterious effects on early embryonic development. Importantly, preincubation of oocytes with a caspase-3-specific inhibitor effectively blocked these OTA-triggered deleterious effects, suggesting that the embryonic injury induced by OTA is mediated via a caspase-dependent apoptotic mechanism. Furthermore, OTA upregulated the levels of p53 and p21 in blastocyst cells derived from OTA-pretreated oocytes, indicating that such cells undergo apoptosis via p53-, p21-, and caspase-3-dependent regulatory mechanisms. This could have deleterious effects on embryonic implantation and fetal survival rates, as seen in our animal models. © 2014 Wiley Periodicals, Inc. Environ Toxicol 31: 724-735, 2016.
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Affiliation(s)
- Fu-Jen Huang
- Department of Obstetrics and Gynecology, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan
- Chang Gung University School of Medicine, Kaohsiung, Taiwan
| | - Wen-Hsiung Chan
- Department of Bioscience Technology and Center for Nanotechnology, Chung Yuan Christian University, Chung Li, Taiwan
- Center for Biomedical Technology, Chung Yuan Christian University, Chung Li, Taiwan
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Huang FJ, Chan WH. Apoptotic effects on maturation of mouse oocytes, fertilization and fetal development by puerarin. Drug Chem Toxicol 2015; 39:380-7. [DOI: 10.3109/01480545.2015.1126842] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Chan WH. Hazardous effects of sanguinarine on maturation of mouse oocytes, fertilization, and fetal development through apoptotic processes. ENVIRONMENTAL TOXICOLOGY 2015; 30:946-955. [PMID: 24677673 DOI: 10.1002/tox.21969] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Revised: 02/03/2014] [Accepted: 02/09/2014] [Indexed: 06/03/2023]
Abstract
Previously, we reported that sanguinarine, a phytoalexin with antimicrobial, anti-oxidant, anti-inflammatory and pro-apoptotic effects, is a risk factor for normal embryonic development that triggers apoptotic processes in the inner cell mass of mouse blastocysts, causing decreased embryonic development and cell viability. In the current study, we investigated the deleterious effects of sanguinarine on mouse oocyte maturation, in vitro fertilization (IVF), and subsequent pre- and postimplantation development both in vitro and in vivo. Notably, sanguinarine significantly impaired mouse oocyte maturation, decreased IVF rates, and inhibited subsequent embryonic development in vitro. Preincubation of oocytes with sanguinarine during in vitro maturation induced an increase in postimplantation embryo resorption and a decrease in mouse fetal weight. In an in vivo animal model, 1 to 5 μM sanguinarine, provided in drinking water, caused a decrease in oocyte maturation and IVF, and led to deleterious effects on early embryonic development. Importantly, preincubation of oocytes with a caspase-3-specific inhibitor effectively blocked sanguinarine-triggered deleterious effects, clearly implying that embryonic injury induced by sanguinarine is mediated by a caspase-dependent apoptotic mechanism.
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Affiliation(s)
- Wen-Hsiung Chan
- Department of Bioscience Technology and Center for Nanotechnology, Chung Yuan Christian University, Chung Li, Taiwan
- Center for Biomedical Technology, Chung Yuan Christian University, Chung Li, Taiwan
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Hsuuw YD, Chan WH. Apoptotic effects of dillapiole on maturation of mouse oocytes, fertilization and fetal development. Drug Chem Toxicol 2015; 38:469-76. [PMID: 25721892 DOI: 10.3109/01480545.2014.1002037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Previously, we reported that dillapiole, a phenylpropanoid with antileishmanial, anti-inflammatory, antifungal and acaricidal activities, is a risk factor for normal embryonic development that triggers apoptotic processes in the inner cell mass of mouse blastocysts, leading to impaired embryonic development and cell viability. In the current study, we investigated the deleterious effects of dillapiole on mouse oocyte maturation, in vitro fertilization (IVF) and subsequent pre- and post-implantation development, both in vitro and in vivo. Notably, dillapiole induced significant impairment of mouse oocyte maturation, decrease in the IVF rate and inhibition of subsequent embryonic development in vitro. Pre-incubation of oocytes with dillapiole during in vitro maturation led to an increase in post-implantation embryo resorption and decrease in mouse fetal weight. In an in vivo animal model, 2.5, 5 or 10 μM dillapiole provided in drinking water caused a decrease in oocyte maturation and IVF, and led to deleterious effects on early embryonic development. Importantly, pre-incubation of oocytes with a caspase-3-specific inhibitor effectively blocked dillapiole-triggered deleterious effects, clearly implying that embryonic injury induced by dillapiole is mediated via a caspase-dependent apoptotic mechanism. To the best of our knowledge, this is the first study to establish the impact of dillapiole on maturation of mouse oocytes, fertilization and sequential embryonic development.
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Affiliation(s)
- Yan-Der Hsuuw
- a Department of Life Science , National Pingtung University of Science and Technology , Pingtung , Taiwan
| | - Wen-Hsiung Chan
- b Department of Bioscience Technology and Center for Nanotechnology , Chung Yuan Christian University , Chung Li , Taiwan , and.,c Center for Biomedical Technology, Chung Yuan Christian University , Chung Li , Taiwan
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IGF-I slightly improves nuclear maturation and cleavage rate of bovine oocytes exposed to acute heat shock in vitro. ZYGOTE 2014; 23:514-24. [DOI: 10.1017/s096719941400015x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
SummaryAn in vitro model of embryo production was used to examine the effects of insulin-like growth factor (IGF)-I on maturation and developmental competence of oocytes exposed to heat shock. Cumulus–oocyte complexes were matured at 38.5°C or exposed to acute heat shock (HS; 41.5°C), with or without 100 ng/ml IGF-I, for 22 h through in vitro maturation. The experimental groups were control (C), C + IGF-I, HS, and HS + IGF-I. Oocytes were fertilized at the end of maturation, and the proportion of cleaved embryos was recorded 44 h later. HS during maturation increased the proportion of TUNEL-positive oocytes (P < 0.05). HS did not have any effect on cortical granule translocation but impaired resumption of meiosis, expressed as a decreased proportion of oocytes with nuclei in metaphase I (P < 0.05) and metaphase II (MII; P < 0.05). HS decreased the proportion of oocytes that cleaved (P < 0.05), in particular those oocytes that further developed to 4-cell-stage embryos (P < 0.05). IGF-I alleviated, to some extent, the deleterious effects of HS on the oocytes as reflected by a reduced proportion of TUNEL-positive oocytes (P < 0.03). While not significant, IGF-I tended to increase the proportion of MII-stage oocytes (P < 0.08) and 4-cell-stage cleaved embryos (P < 0.06). Further examination is required to explore whether IGF-I also affects the developmental competence of oocytes exposed to HS.
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Injurious effects of emodin on maturation of mouse oocytes, fertilization and fetal development via apoptosis. Int J Mol Sci 2012. [PMID: 23203041 PMCID: PMC3509557 DOI: 10.3390/ijms131113911] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Emodin (1,3,8-trihydroxy-6-methylanthraquinone), a major constituent of rhubarb, has a wide range of therapeutic applications. Previous studies have established that emodin induces apoptosis in the inner cell mass and trophectoderm of mouse blastocysts and leads to decreased embryonic development and viability, indicating a role as an injury risk factor for normal embryonic development. However, the mechanisms underlying its hazardous effects have yet to be characterized. In the current study, we further investigated the effects of emodin on oocyte maturation and subsequent pre- and post-implantation development, both in vitro and in vivo. Notably, emodin induced a significant reduction in the rates of oocyte maturation, fertilization, and in vitro embryonic development. Treatment of oocytes with emodin during in vitro maturation (IVM) led to increased resorption of postimplantation embryos and decreased fetal weight. Experiments using an in vivo mouse model disclosed that consumption of drinking water containing 20–40 μM emodin led to decreased oocyte maturation and in vitro fertilization, as well as early embryonic developmental injury. Notably, pretreatment with a caspase-3-specific inhibitor effectively prevented emodin-triggered injury effects, suggesting that impairment of embryo development occurs via a caspase-dependent apoptotic process.
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Influence of selected (pre-)maturational parameters on in vitro development and sex distribution of bovine embryos. ZYGOTE 2012; 22:41-9. [PMID: 22784675 DOI: 10.1017/s0967199412000275] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The objectives of this research were to study the influence of a reduced oxygen concentration during in vitro maturation (IVM) and examine the effect of follicular glucose concentration on bovine in vitro development and sex distribution. In the first experiment, abattoir-derived cumulus-oocyte complexes (COC) were matured under 5% O2 or 20% O2. Secondly, COC were isolated and the glucose (G) concentration of each follicle was determined. COC were pooled in groups (G (< 1.1 mMol) or G (≥ 1.1 mMol)) according to the glucose content before being subjected to in vitro production (IVP). Cleavage and development rates were assessed on days 3, 7 and 8 post insemination. Blastocysts of each group were sexed by polymerase chain reaction (PCR). Expanded blastocysts were stained to assess total cell numbers and live-dead cell ratio. Cleavage and development rates stayed similar after reducing the O2 concentration during IVM. The sex ratio of embryos generated from oocytes matured under 5% O2 was shifted in favour of the female (♀: 61.9%), whereas the sex ratio of embryos belonging to the IVM 20% O2 group did not differ significantly from the expected 50:50 ratio. Neither a 'higher' nor a 'lower' intrafollicular glucose concentration influenced cleavage and development rates, cell numbers or live-dead cell ratio. Eighty five per cent (G (<1.1)) and 63.6% (G (≥ 1.1)) of the analysed embryos were female. In summary, neither a reduced O2 concentration during IVM nor selection based on follicular glucose concentrations affected the morphological quality of embryos. Although the sex distribution was shifted in favour of female embryos in all three experimental groups, more male embryos could be seen in the G (≥ 1.1) group compared with the G(<1.1) group.
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Sakatani M, Alvarez N, Takahashi M, Hansen P. Consequences of physiological heat shock beginning at the zygote stage on embryonic development and expression of stress response genes in cattle. J Dairy Sci 2012; 95:3080-91. [DOI: 10.3168/jds.2011-4986] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Accepted: 01/20/2012] [Indexed: 01/07/2023]
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Chen CC, Chan WH. Injurious effects of curcumin on maturation of mouse oocytes, fertilization and fetal development via apoptosis. Int J Mol Sci 2012; 13:4655-4672. [PMID: 22606002 PMCID: PMC3344238 DOI: 10.3390/ijms13044655] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Revised: 03/31/2012] [Accepted: 04/09/2012] [Indexed: 11/16/2022] Open
Abstract
Curcumin, a common dietary pigment and spice, is a hydrophobic polyphenol derived from the rhizome of the herb Curcuma longa. Previously, we reported a cytotoxic effect of curcumin on mouse embryonic stem cells and blastocysts and its association with defects in subsequent development. In the present study, we further investigated the effects of curcumin on oocyte maturation and subsequent pre- and post-implantation development, both in vitro and in vivo. Notably, curcumin induced a significant reduction in the rate of oocyte maturation, fertilization, and in vitro embryonic development. Treatment of oocytes with curcumin during in vitro maturation (IVM) led to increased resorption of postimplantation embryos and decreased fetal weight. Experiments with an in vivo mouse model disclosed that consumption of drinking water containing 40 μM curcumin led to decreased oocyte maturation and in vitro fertilization as well as early embryonic developmental injury. Finally, pretreatment with a caspase-3-specific inhibitor effectively prevented curcumin-triggered injury effects, suggesting that embryo impairment by curcumin occurs mainly via a caspase-dependent apoptotic process.
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Affiliation(s)
| | - Wen-Hsiung Chan
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +886-3-2653515; Fax: +886-3-2653599
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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: 3.0] [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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22
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Developmental competence of porcine oocytes after in vitro maturation and in vitro culture under different oxygen concentrations. ZYGOTE 2011; 20:1-8. [DOI: 10.1017/s0967199411000426] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
SummaryIn this study, we investigated the effect of two oxygen concentrations (5 and 20%) during in vitro maturation (IVM) and during in vitro culture (IVC) on porcine embryo development and analysed differences in gene expression between cumulus–oocyte complexes matured under 5 or 20% oxygen and the resulting blastocysts cultured under 5% or 20% oxygen following parthenogenetic activation. There was no significant difference in oocyte maturation rate. However, the numbers of resulting blastocysts were significantly increased in the 5% IVC group compared with the 20% IVC group. Moreover, the M20C5 treatment group (23.01%) supported greater blastocyst development compared with the M5C5 (14.32%), M5C20 (10.30%), and M20C20 (17.88%) groups. However, total cell numbers were not significantly different among groups. According to mRNA abundance data of multiple genes, each treatment altered the expression of genes in different patterns. GLUT1, G6PD and LDHA were up-regulated in cumulus cells that had been matured in low oxygen, suggesting a higher glucose uptake and an increase in anaerobic glycolysis, whereas cyclin B1 (CCNB) and MnSOD (Mn-superoxide dismutase) were upregulated in cumulus cells that had been matured in high oxygen, which suggests a higher activity of mitosis-promoting factor and antioxidant response. In spite of these differential effects on cumulus cells, oocytes could mature normally regardless of different oxygen concentrations. Therefore, it can be concluded that high oxygen concentration during in vitro maturation and low oxygen during in vitro culture may alter the expression of multiple genes related to oocyte competence and significantly improves embryo development (p < 0.05) but not blastocyst quality.
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Mingoti GZ, Castro VSDC, Méo SC, Sá Barretto LS, Garcia JM. The effects of macromolecular and serum supplements and oxygen tension during bovine in vitro procedures on kinetics of oocyte maturation and embryo development. In Vitro Cell Dev Biol Anim 2011; 47:361-7. [PMID: 21424239 DOI: 10.1007/s11626-011-9400-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Accepted: 02/22/2011] [Indexed: 11/29/2022]
Abstract
Aiming to standardize in vitro production of bovine embryos and to obtain supplements to replace serum in culture media, this study evaluated the nuclear maturation kinetics and embryonic development in bovine after in vitro maturation (IVM) and culture (IVC) with several macromolecules (animal origin: bovine serum albumin (BSA), fetal calf serum (FCS); synthetic: polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), Ficoll, and Knockout) at two oxygen tensions (20% and 5% O(2)). Regarding nuclear kinetics, neither the presence of the expected stage (metaphase I, transition anaphase to telophase, and metaphase II) at each evaluation moment (6, 18, and 24 h after IVM, respectively) nor the accelerated polar body emission (at 18 h after IVM) related developmental competence to blastocyst stage when different supplements were compared. Independently of supplement, cleavage rates at 20% O(2) (61.6-79.2%) were higher than at 5% O(2) (38.9-58.7%). At 20% O(2), higher blastocyst and hatching rates, respectively, were obtained in treatments BSA, FCS, Knockout, and control group (IVM with FCS and IVC with BSA + FCS, 14.0-23.5% and 6.8-15.4%) in comparison to PVA, PVP, and Ficoll (0%). The same was observed at 5% O(2) for blastocyst rates with BSA, FCS, Knockout, and control (5.4-16.8%) and for hatching rates with BSA, FCS, and control (2.0-11.1%). We can conclude that producing bovine embryos at 20% O(2) during the entire IVP process resulted in higher developmental rates than at 5% O(2). In addition, while defined macromolecules PVA, PVP, and Ficoll were not suitable for embryonic development, the synthetic serum Knockout was able to replace serum and albumin for IVP in bovine at 20% O(2).
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Affiliation(s)
- Gisele Zoccal Mingoti
- School of Veterinary Medicine, Department of Animal Health, UNESP, Rua Clóvis Pestana, 793, 16050-680, Araçatuba, São Paulo, Brazil.
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Heinzmann J, Hansmann T, Herrmann D, Wrenzycki C, Zechner U, Haaf T, Niemann H. Epigenetic profile of developmentally important genes in bovine oocytes. Mol Reprod Dev 2011; 78:188-201. [PMID: 21290475 DOI: 10.1002/mrd.21281] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2010] [Accepted: 12/25/2010] [Indexed: 12/29/2022]
Abstract
Assisted reproductive technologies are associated with an increased incidence of epigenetic aberrations, specifically in imprinted genes. Here, we used the bovine oocyte as a model to determine putative epigenetic mutations at three imprinted gene loci caused by the type of maturation, either in vitro maturation (IVM) in Tissue Culture Medium 199 (TCM) or modified synthetic oviduct fluid (mSOF) medium, or in vivo maturation. We applied a limiting dilution approach and direct bisulfite sequencing to analyze the methylation profiles of individual alleles (DNA molecules) for H19/IGF2, PEG3, and SNRPN, which are each associated with imprinting defects in humans and/or the mouse model, and are known to be differentially methylated in bovine embryos. Altogether, we obtained the methylation patterns of 203 alleles containing 4,512 CpG sites from immature oocytes, 213 alleles with 4,779 CpG sites from TCM-matured oocytes, 215 alleles/4,725 CpGs in mSOF-matured oocytes, and 78 alleles/1,672 CpGs from in vivo-matured oocytes. The total rate of individual CpGs and entire allele methylation errors did not differ significantly between the two IVM and the in vivo group, indicating that current IVM protocols have no or only marginal effects on these critical epigenetic marks. Furthermore, the mRNA expression profiles of the three imprinted genes and a panel of eight other genes indicative of oocyte competence were determined by quantitative real-time PCR. We found different mRNA expression profiles between in vivo-matured oocytes versus their in vitro-matured counterparts, suggesting an influence on regulatory mechanisms other than DNA methylation.
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Affiliation(s)
- J Heinzmann
- Institute of Farm Animal Genetics (Friedrich-Loeffler-Institut, FLI), Mariensee, Neustadt, Germany.
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Bain NT, Madan P, Betts DH. The early embryo response to intracellular reactive oxygen species is developmentally regulated. Reprod Fertil Dev 2011; 23:561-75. [DOI: 10.1071/rd10148] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2010] [Accepted: 11/17/2010] [Indexed: 12/28/2022] Open
Abstract
In vitro embryo production (IVP) suffers from excessive developmental failure. Its inefficiency is linked, in part, to reactive oxygen species (ROS) brought on by high ex vivo oxygen (O2) tensions. To further delineate the effects of ROS on IVP, the intracellular ROS levels of early bovine embryos were modulated by: (1) varying O2 tension; (2) exogenous H2O2 treatment; and (3) antioxidant supplementation. Although O2 tension did not significantly affect blastocyst frequencies (P > 0.05), 20% O2 accelerated the rate of first cleavage division and significantly decreased and increased the proportion of permanently arrested 2- to 4-cell embryos and apoptotic 9- to 16-cell embryos, respectively, compared with embryos cultured in 5% O2 tension. Treatment with H2O2, when applied separately to oocytes, zygotes, 2- to 4-cell embryos or 9- to 16-cell embryos, resulted in a significant (P < 0.05) dose-dependent decrease in blastocyst development in conjunction with a corresponding increase in the induction of either permanent embryo arrest or apoptosis in a stage-dependent manner. Polyethylene glycol–catalase supplementation reduced ROS-induced embryo arrest and/or death, resulting in a significant (P < 0.05) increase in blastocyst frequencies under high O2 culture conditions. Together, these results indicate that intracellular ROS may be signalling molecules that, outside an optimal range, result in various developmentally regulated modes of embryo demise.
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26
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Park JH, Maclaughlin DT, Teixeira JM. The rate of in vitro maturation of primary follicles from adult mice and the quality of oocytes is improved in the absence of anti-mullerian hormone. Reprod Sci 2010; 18:334-41. [PMID: 21098214 DOI: 10.1177/1933719110388294] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Anti-Müllerian hormone (AMH) inhibits the recruitment of primordial follicles into the growing pool, but its role in primary and secondary follicles is not clear. We isolated primary follicles from the ovaries of 9- to 10-week old mice and examined whether AMH affected follicular development. Follicles were matured in media that was prepared using unsexed fetal bovine serum (FBS) or female FBS (FFBS) with or without added AMH for approximately 2 weeks and maturation rates to secondary follicles and metaphase II (MII) oocytes were measured by standard morphological criteria. Rates of parthenogenetic activation and in vitro fertilization (IVF) were assessed by cleavage and blastocyst development, respectively. Whereas addition of AMH blocked primary to secondary follicle transition, the primary to secondary and secondary to MII follicle maturation rates was significantly improved with FFBS. Folliculogenesis resumed once AMH was removed from the media of the arrested primary follicles. The rates of IVF and parthenogenesis of oocytes after in vitro maturation (IVM) without AMH were also improved compared to controls. The results indicate that removal of AMH from culture conditions during IVM from primary follicular stages should be considered to improve outcome.
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Affiliation(s)
- Joo Hyun Park
- Vincent Center for Reproductive Biology, Department of Obstetrics and Gynecology, MA 02114, USA
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27
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Hazardous apoptotic effects of 2-bromopropane on maturation of mouse oocytes, fertilization, and fetal development. Int J Mol Sci 2010; 11:4361-80. [PMID: 21151443 PMCID: PMC3000087 DOI: 10.3390/ijms11114361] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Revised: 11/01/2010] [Accepted: 11/01/2010] [Indexed: 02/01/2023] Open
Abstract
2-Bromopropane (2-BP) is used as an alternative to ozone-depleting cleaning solvents. Previously, we reported that 2-BP has cytotoxic effects on mouse blastocysts and is associated with defects in subsequent development. Here, we further investigate the effects of 2-BP on oocyte maturation and subsequent pre- and post-implantation development, both in vitro and in vivo. Notably, 2-BP induced a significant reduction in the rates of oocyte maturation, fertilization, and in vitro embryonic development. Treatment of oocytes with 2-BP during in vitro maturation (IVM) resulted in increased resorption of postimplantation embryos and decreased fetal weights. Experiments with a mouse model disclosed that consumption of drinking water containing 20 μM 2-BP led to decreased oocyte maturation in vivo and fertilization in vitro, as well as impairment of early embryonic development. Interestingly, pretreatment with a caspase-3-specific inhibitor effectively prevented 2-BP-triggered hazardous effects, suggesting that embryonic impairment by 2-BP occurs via a caspase-dependent apoptotic process. A study using embryonic stem cells as the assay model conclusively demonstrated that 2-BP induces cell death processes through apoptosis and not necrosis, and inhibits early embryo development in mouse embryonic stem cells. These results collectively confirm the hazardous effects of 2-BP on embryos derived from pretreated oocytes.
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28
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Boone WR, Higdon HL, Johnson JE. Quality Management Issues in the Assisted Reproduction Laboratory. ACTA ACUST UNITED AC 2010. [DOI: 10.1177/205891581000100103] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In the United States, the Clinical Laboratory Improvement Act (CLIA) of 1988 describes requirements and guidelines for implementing a quality control/quality assurance (QC/QA) program for moderate and high complexity laboratories. These requirements and guidelines apply to Assisted Reproductive Technology (ART) laboratories as well. The general topic of QC and QA as it pertains to in vitro fertilization (IVF) and embryo transfer (ET) is extensively reviewed. This review summarizes many of the QC and QA events that contribute to the advancement of knowledge in this biotechnological field. These events include control of the culture environment inside and outside of the incubator, as well as factors that affect culture media. This review also discusses, in considerable detail, the QC and the QA that pertain to equipment used within the laboratory and how to control for potential contaminants, which reside within the laboratory. This review provides evidence to indicate the need for laboratory personnel to monitor quality improvement issues on a continuous basis. Personnel must be willing to change as improvements in technology occur in order to meet the ever-evolving demands of a more difficult patient population. Suggestions for meeting these demands are offered.
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Affiliation(s)
- William R. Boone
- Greenville Hospital System University Medical Center, Greenville, South Carolina Department of Obstetrics and Gynecology
| | - H. Lee Higdon
- Greenville Hospital System University Medical Center, Greenville, South Carolina Department of Obstetrics and Gynecology
| | - Jane E. Johnson
- Greenville Hospital System University Medical Center, Greenville, South Carolina Department of Obstetrics and Gynecology
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Chang YJ, Chan WH. Methylglyoxal has injurious effects on maturation of mouse oocytes, fertilization, and fetal development, via apoptosis. Toxicol Lett 2010; 193:217-23. [DOI: 10.1016/j.toxlet.2010.01.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Revised: 01/11/2010] [Accepted: 01/13/2010] [Indexed: 10/19/2022]
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Schelbach CJ, Kind KL, Lane M, Thompson JG. Mechanisms contributing to the reduced developmental competence of glucosamine-exposed mouse oocytes. Reprod Fertil Dev 2010; 22:771-9. [DOI: 10.1071/rd09193] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2009] [Accepted: 11/04/2009] [Indexed: 01/20/2023] Open
Abstract
Glucosamine (GlcN) is a widely used hyperglycaemia mimetic because of its ability to upregulate the ‘energy-sensing’ hexosamine biosynthesis pathway in a dose-dependent manner. A previous study demonstrated that addition of GlcN (2.5–5 mM) during IVM of cattle and pig cumulus–oocyte complexes (COC) inhibited development following fertilisation and early cleavage. In the present study, we demonstrate that the addition of 2.5 mM GlcN during IVM of mouse COCs similarly inhibits embryo development, with the degree of inhibition dependent upon the availability of glucose in the maturation medium. Furthermore, we determined that the effect of GlcN is likely mediated by the cumulus cell vestment, because we failed to observe inhibitory effects of GlcN following maturation of denuded (and therefore already developmentally compromised) oocytes. As with cattle oocytes, inhibition of O-linked glycosylation of unknown proteins within mouse cumulus cells significantly reversed the effects of GlcN. Finally, we also provide preliminary evidence that GlcN may inhibit the pentose phosphate metabolic pathway within the oocyte, an effect possibly mediated by cumulus cells in intact COCs. Collectively, our results demonstrate that GlcN inhibits the developmental competence of IVM mouse oocytes and suggest that this occurs via cumulus cell-mediated mechanisms. Therefore, the in vitro addition of GlcN is a useful experimental tool to determine the mechanisms of hyperglycaemic responses within COCs.
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Bermejo-Alvarez P, Lonergan P, Rizos D, Gutiérrez-Adan A. Low oxygen tension during IVM improves bovine oocyte competence and enhances anaerobic glycolysis. Reprod Biomed Online 2009; 20:341-9. [PMID: 20093090 DOI: 10.1016/j.rbmo.2009.12.006] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2009] [Revised: 07/15/2009] [Accepted: 11/16/2009] [Indexed: 11/13/2022]
Abstract
This study evaluated the effect of two oxygen concentrations (20 and 5%) on bovine embryo development (kinetics of first cleavage and blastocyst development) during maturation (M) and fertilization (F) and analysed differences in gene expression between cumulus-oocyte complexes (COC) matured at 5 or 20% oxygen and the resulting blastocysts. A total of 1179 COC were divided into four groups according to the oxygen tension used (M5F5, M5F20, M20F5 and M20F20). Relative poly(A) mRNA abundance of GLUT1, GAPDH, LDHA, G6PD, MNSOD, GPX1, IGFR2, BAX, CCNB1, PTGS2 and GREM1 was analysed in COC, whereas 10 quality-related genes were analysed in blastocysts. M20F5 group developmental rates were significantly lower than all other groups (one-way ANOVA, P < or = 0.05). Two-way ANOVA showed a beneficial effect of low oxygen tension during in-vitro maturation on developmental rates, whereas the opposite situation was obtained in fertilization (P < or = 0.05). GAPDH, IGFR2, CCNB1, and GREM1 were up-regulated in the oocytes matured in low oxygen, whereas GLUT1, GAPDH, LDHA and GREM1 were up-regulated and PTGS2 down-regulated in the cumulus cells from the M5 group (P < or = 0.05). No differences were observed in blastocysts. Low oxygen tension during maturation alters the expression of genes related to oocyte competence and glucose metabolism and significantly (P < or = 0.05) improves embryo development, but not blastocyst quality.
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Shiao NH, Chan WH. Injury effects of ginkgolide B on maturation of mouse oocytes, fertilization, and fetal development in vitro and in vivo. Toxicol Lett 2009; 188:63-9. [DOI: 10.1016/j.toxlet.2009.03.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2008] [Revised: 03/04/2009] [Accepted: 03/05/2009] [Indexed: 11/16/2022]
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The effect of interaction between macromolecule supplement and oxygen tension on bovine oocytes and embryos culturedin vitro. ZYGOTE 2009; 17:321-8. [DOI: 10.1017/s0967199409005450] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
SummaryAiming to improvein vitroproduction of bovine embryos and to obtain supplements to replace serum forin vitromaturation (IVM), this study evaluated the effects of macromolecular supplementation of IMV medium (bovine serum albumin – BSA, polyvinyl alcohol – PVA, polyvinyl pyrrolidone – PVP, Ficoll, KnockoutSR, or fetal calf serum – FCS) and oxygen tension [5% CO2in air (20% O2) or 5% CO2, 5% O2and 90% N2(5% O2)] on oocyte maturation and embryo development. Nuclear progression to germinal vesicle breakdown, metaphase I and metaphase II stages were evaluated and overall results revealed that undefined (FCS) and semi-defined (BSA) media gave better results at 20% O2and defined media (PVA, PVP and Ficoll) at 5% O2. Independent of macromolecule supplement, IVM at 20% O2was considered optimal for nuclear maturation. To evaluate embryo development, oocytes matured in the previously described conditions were fertilized and cultured at the same oxygen tension used for IVM and assessed for cleavage (43.0 to 74.8%) and development to morulae (16.4 to 33.8%), blastocyst (7.7 to 52.9%) and hatched blastocyst (9.6 to 48.1%). Apart from oxygen tension, all treatments, except Knockout (22.7%), gave similar results for blastocyst development (26.5 to 38.7%). Independently of macromolecule supplement, higher development rates were obtained in an oxygen tension of 20% O2(67.4% cleavage, 29.2% morulae, 40.8% blastocyst and 34.0% hatched blastocyst) when compared with 5% O2(52.5, 21.8, 18.2 and 15.6%, respectively). This study indicates that BSA, PVA, PVP and Ficoll can replace serum during IVM and that the optimal atmospheric condition forin vitroproduction of bovine embryos is 5% CO2and 20% O2.
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Hsieh MS, Shiao NH, Chan WH. Cytotoxic effects of CdSe quantum dots on maturation of mouse oocytes, fertilization, and fetal development. Int J Mol Sci 2009; 10:2122-2135. [PMID: 19564943 PMCID: PMC2695271 DOI: 10.3390/ijms10052122] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2009] [Revised: 04/26/2009] [Accepted: 04/28/2009] [Indexed: 01/06/2023] Open
Abstract
Quantum dots (QDs) are useful novel luminescent markers, but their embryonic toxicity is yet to be fully established, particularly in oocyte maturation and sperm fertilization. Earlier experiments by our group show that CdSe-core QDs have cytotoxic effects on mouse blastocysts and are associated with defects in subsequent development. Here, we further investigate the influence of CdSe-core QDs on oocyte maturation, fertilization, and subsequent pre- and postimplantation development. CdSe-core QDs induced a significant reduction in the rates of oocyte maturation, fertilization, and in vitro embryo development, but not ZnS-coated CdSe QDs. Treatment of oocytes with 500 nM CdSe-core QDs during in vitro maturation (IVM) led to increased resorption of postimplantation embryos and decreased placental and fetal weights. To our knowledge, this is the first study to report the negative impact of CdSe-core QDs on mouse oocyte development. Moreover, surface modification of CdSe-core QDs with ZnS effectively prevented this cytotoxicity.
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Sturmey RG, Hawkhead JA, Barker EA, Leese HJ. DNA damage and metabolic activity in the preimplantation embryo. Hum Reprod 2009; 24:81-91. [PMID: 18835872 DOI: 10.1093/humrep/den346] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND Embryos with greater viability have a lower or 'quieter' amino acid metabolism than those which arrest. We have hypothesized this is due to non-viable embryos possessing greater cellular/molecular damage and consuming more nutrients, such as amino acids for repair processes. We have tested this proposition by measuring physical damage to DNA in bovine, porcine and human embryos at the blastocyst stage and relating the data to amino acid profiles during embryo development. METHODS Amino acid profiles of in vitro-derived porcine and bovine blastocysts were measured by high-performance liquid chromatography and the data related retrospectively to DNA damage in each individual blastomere using a modified alkaline comet assay. Amino acid profiles of spare human embryos on Day 2-3 were related to DNA damage at the blastocyst stage. RESULTS A positive correlation between amino acid turnover and DNA damage was apparent when each embryo was examined individually; a relationship exhibited by all three species. There was no relationship between DNA damage and embryo grade. CONCLUSIONS Amino acid profiling of single embryos can provide a non-invasive marker of DNA damage at the blastocyst stage. The data are consistent with the quiet embryo hypothesis with viable embryos (lowest DNA damage) having the lowest amino acid turnover. Moreover, these data support the notion that metabolic profiling, in terms of amino acids, might be used to select single embryos for transfer in clinical IVF.
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Affiliation(s)
- Roger G Sturmey
- Biology Department (Area 3), University of York, York YO10 5YW, UK.
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Chan WH. Effects of citrinin on maturation of mouse oocytes, fertilization, and fetal development in vitro and in vivo. Toxicol Lett 2008; 180:28-32. [DOI: 10.1016/j.toxlet.2008.05.011] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2008] [Revised: 05/22/2008] [Accepted: 05/23/2008] [Indexed: 10/22/2022]
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