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Młodawska W, Maliński B, Godyń G, Nosal B. Lipid content and G6PDH activity in relation to ooplasm morphology and oocyte maturational competence in the domestic cat model. Reprod Biol 2024; 24:100927. [PMID: 39146721 DOI: 10.1016/j.repbio.2024.100927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 07/16/2024] [Accepted: 07/17/2024] [Indexed: 08/17/2024]
Abstract
The aim of the study was to investigate the relationship between ooplasm morphology, lipid content, glucose-6-phosphate dehydrogenase activity (G6PDH) and maturation potential of domestic cat oocytes. Cumulus-oocyte complexes were classified according to ooplasm morphology: evenly dark (dCOC), heterogeneous/mosaic (hCOC), or light/transparent (lCOC), however only dCOCs are thought to be the best-quality, the remaining ones are usually rejected, therefore little is known about their intracellular properties. Lipid droplets (LDs) were visualized and quantified using Oil Red O. G6PDH activity was assessed before in vitro maturation (IVM), using the brilliant cresyl blue (BCB) test. IVM-control oocytes underwent IVM without BCB staining. The dCOCs and hCOCs had different patterns of LD spatial distribution, but similar amounts of lipid, although this tended towards being lower in hCOCs. Low G6PDH activity (BCB+) was observed in 74 %, 60 % and 24 % (P < 0.01) of dCOCs, hCOCs, and lCOCs, respectively. Significantly more BCB+ /oocytes than BCB-/oocytes reached the metaphase II stage in all groups. The maturation rate of BCB+ /hCOCs was higher than that of IVM/hCOC-controls (40 % v.s. 20 %, P < 0.001), and was comparable to that of BCB+ /dCOCs (54 %; P > 0.05). lCOCs were the smallest (P < 0.01), contained fewer (P < 0.01) lipids than dCOCs or hCOCs, and displayed reduced maturational potential. Overall, LD content and distribution, as well as G6PDH activity, in cat oocytes were strongly associated with ooplasm morphology and oocyte maturational competence. Deeper understanding of the intrinsic properties of oocytes with different ooplasm morphology using the domestic cat model, may be particularly important in the context of the conservation of endangered felids.
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Affiliation(s)
- Wiesława Młodawska
- Department of Animal Reproduction, Anatomy and Genomics, University of Agriculture in Kraków, Al. Mickiewicza 24/28, 30-059 Kraków, Poland.
| | - Bartosz Maliński
- Department of Animal Reproduction, Anatomy and Genomics, University of Agriculture in Kraków, Al. Mickiewicza 24/28, 30-059 Kraków, Poland
| | - Gabriela Godyń
- Department of Animal Reproduction, Anatomy and Genomics, University of Agriculture in Kraków, Al. Mickiewicza 24/28, 30-059 Kraków, Poland
| | - Beata Nosal
- Department of Animal Reproduction, Anatomy and Genomics, University of Agriculture in Kraków, Al. Mickiewicza 24/28, 30-059 Kraków, Poland
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2
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Huijsmans TERG, Hassan HA, Smits K, Van Soom A. Postmortem Collection of Gametes for the Conservation of Endangered Mammals: A Review of the Current State-of-the-Art. Animals (Basel) 2023; 13:ani13081360. [PMID: 37106923 PMCID: PMC10135332 DOI: 10.3390/ani13081360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/03/2023] [Accepted: 04/12/2023] [Indexed: 04/29/2023] Open
Abstract
The collection of gametes from recently deceased domestic and wildlife mammals has been well documented in the literature. Through the utilization of gametes recovered postmortem, scientists have successfully produced embryos in 10 different wildlife species, while in 2 of those, offspring have also been born. Thus, the collection of gametes from recently deceased animals represents a valuable opportunity to increase genetic resource banks, obviating the requirement for invasive procedures. Despite the development of several protocols for gamete collection, the refinement of these techniques and the establishment of species-specific protocols are still required, taking into account both the limitations and the opportunities. In the case of wildlife, the optimization of such protocols is impeded by the scarcity of available animals, many of which have a high genetic value that must be protected rather than utilized for research purposes. Therefore, optimizing protocols for wildlife species by using domestic species as a model is crucial. In this review, we focused on the current advancements in the collection, preservation, and utilization of gametes, postmortem, in selected species belonging to Equidae, Bovidae, and Felidae, both domestic and wildlife.
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Affiliation(s)
- Tim E R G Huijsmans
- Department of Internal Medicine, Reproduction, and Population Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - Hiba Ali Hassan
- Department of Internal Medicine, Reproduction, and Population Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - Katrien Smits
- Department of Internal Medicine, Reproduction, and Population Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - Ann Van Soom
- Department of Internal Medicine, Reproduction, and Population Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
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3
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Chavez DR, Lee PC, Comizzoli P. Oocyte Meiotic Competence in the Domestic Cat Model: Novel Roles for Nuclear Proteins BRD2 and NPM1. Front Cell Dev Biol 2021; 9:670021. [PMID: 34012967 PMCID: PMC8126674 DOI: 10.3389/fcell.2021.670021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 04/12/2021] [Indexed: 12/03/2022] Open
Abstract
To participate in fertilization and embryo development, oocytes stored within the mammalian female ovary must resume meiosis as they are arrested in meiotic prophase I. This ability to resume meiosis, known as meiotic competence, requires the tight regulation of cellular metabolism and chromatin configuration. Previously, we identified nuclear proteins associated with the transition from the pre-antral to the antral follicular stage, the time at which oocytes gain meiotic competence. In this study, the objective was to specifically investigate three candidate nuclear factors: bromodomain containing protein 2 (BRD2), nucleophosmin 1 (NPM1), and asparaginase-like 1 (ASRGL1). Although these three factors have been implicated with folliculogenesis or reproductive pathologies, their requirement during oocyte maturation is unproven in any system. Experiments were conducted using different stages of oocytes isolated from adult cat ovaries. The presence of candidate factors in developing oocytes was confirmed by immunostaining. While BRD2 and ASRGL1 protein increased between pre-antral and the antral stages, changes in NPM1 protein levels between stages were not observed. Using protein inhibition experiments, we found that most BRD2 or NPM1-inhibited oocytes were incapable of participating in fertilization or embryo development. Further exploration revealed that inhibition of BRD2 and NPM-1 in cumulus-oocyte-complexes prevented oocytes from maturing to the metaphase II stage. Rather, they remained at the germinal vesicle stage or arrested shortly after meiotic resumption. We therefore have identified novel factors playing critical roles in domestic cat oocyte meiotic competence. The identification of these factors will contribute to improvement of domestic cat assisted reproduction and could serve as biomarkers of meiotically competent oocytes in other species.
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Affiliation(s)
- Daniela R Chavez
- Smithsonian Conservation Biology Institute, National Zoological Park, Washington, DC, United States
| | - Pei-Chih Lee
- Smithsonian Conservation Biology Institute, National Zoological Park, Washington, DC, United States
| | - Pierre Comizzoli
- Smithsonian Conservation Biology Institute, National Zoological Park, Washington, DC, United States
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4
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Chi Y, Peng B, Lu J. Effect of ovarian storage time at 4 degrees C on cumulus cell apoptosis in porcine antral follicles. Anim Sci J 2020; 91:e13465. [PMID: 33222358 DOI: 10.1111/asj.13465] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 07/08/2020] [Accepted: 07/15/2020] [Indexed: 02/03/2023]
Abstract
The present study was conducted to investigate the effect of cold storage time on apoptosis of cumulus cells (CCs) from porcine ovaries, and to compare the sensitivity of four apoptosis-detection methods. Porcine ovaries were stored in physiological saline solution at 4°C for 0, 7, 24 and 48 hr, and then cumulus cells or granulosa cells (GCs) in antral follicles were retrieved to detect cell apoptosis. Cumulus cells isolated from stored ovaries for 24 hr presented obvious apoptosis using terminal deoxynucleotidyl transferase (TdT)-mediated d-UTP nick end-labeling (TUNEL) assay. A typical DNA ladder pattern of apoptosis was observed in GCs 24 hr post storage treatment. The mean Olive Tail Moment of CCs was significantly increased after 24 hr using comet assay; however, the mean tail migration and mean tail DNA increased gradually after 7 hr of storage. In addition, annexin V/PI staining assay showed an obvious increase in apoptotic CCs (Annexin V positive, PI negative) 7 hr after treatment, and the apoptotic rate reached to a peak at 24 hr followed by a decline after 48 hr of storage to the level at 7 hr. In conclusion, cold storage of porcine ovary in physiological saline solution induced a time-dependent increase in apoptosis of cumulus cells, and annexin V/PI staining combined with comet assay provided a sensitive and reliable method to detect early damages in cumulus cells induced by cold storage of ovary.
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Affiliation(s)
- Yafei Chi
- Laboratory Animal Center, Capital Medical University, Beijing, China
| | - Boya Peng
- Laboratory Animal Center, Capital Medical University, Beijing, China
| | - Jing Lu
- Laboratory Animal Center, Capital Medical University, Beijing, China.,Department of Laboratory Animal Science, School of Basic Medical Science, Capital Medical University, Beijing, China
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Vilela JDMV, Dolmans MM, Amorim CA. Ovarian tissue transportation: a systematic review. Reprod Biomed Online 2020; 42:351-365. [PMID: 33288476 DOI: 10.1016/j.rbmo.2020.11.001] [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: 08/04/2020] [Revised: 11/06/2020] [Accepted: 11/06/2020] [Indexed: 12/20/2022]
Abstract
In recent years, some countries and fertility preservation networks have started adopting 24 h transportation for ovarian tissue, a practice that has the potential to spread very quickly due to the high costs and bureaucracy involved in the establishment of ovarian tissue cryobanks. While pregnancies and live births have been reported after such long periods of transportation, this, however, remains an empirical procedure. This review aims to prompt reflection on ovarian tissue transport, highlighting the lack of knowledge in humans by providing a counterpoint looking into more than 40 studies published in different animal models. By discussing these studies in animals, the findings of various models can be deciphered, and light shed on the patterns identified. Like the development of different assisted reproductive technology procedures, this is an important step in creating guidelines for future studies on human ovarian tissue transportation.
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Affiliation(s)
| | - Marie-Madeleine Dolmans
- Pôle de Recherche en Gynécologie, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, Brussels, Belgium; Gynecology Department, Cliniques Universitaires Saint-Luc, Brussels, Belgium
| | - Christiani Andrade Amorim
- Pôle de Recherche en Gynécologie, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, Brussels, Belgium.
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6
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Colombo M, Zahmel J, Binder C, Herbel J, Luvoni GC, Jewgenow K. Ovary cold storage and shipment affect oocyte yield and cleavage rate of cat immature vitrified oocytes. Cryobiology 2020; 98:181-186. [PMID: 33171197 DOI: 10.1016/j.cryobiol.2020.11.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 10/30/2020] [Accepted: 11/04/2020] [Indexed: 01/23/2023]
Abstract
In feline species, cooled transport of ovaries can be employed without detrimental effects to retrieve immature oocytes intended for in vitro embryo production purposes. Indeed, this is the most common way to collect gametes from gonads of wild, valuable animals after they die or are castrated far from specialized laboratories. However, fresh retrieved gametes are generally used, and their cryosensitivity is not known. This study employed ovariectomy-derived domestic cat gonads as a model for wild felids, and aimed to compare the yield and developmental competence of Cryotop-vitrified oocytes (VOs) collected and cryopreserved right after ovary excision (In loco-VOs) or after 24 h cooled transport of ovaries (Shipped-VOs). The number of collected oocytes was higher in In loco-VOs than in Shipped-VOs (mean ± SD: 8 ± 3.36 vs 5.6 ± 3.1, p = 0.05). In vitro embryo production resulted in similar maturation (35% for both vitrified groups, p = 1) and fertilization rates (In loco-VOs: 29.1%; Shipped-VOs: 22.2%; p = 0.295), but showed a difference in cleavage (In loco-VOs: 25.6%; Shipped-VOs: 14.5%; p = 0.0495). No differences were found in further embryo development. Taken together, results suggested that delayed oocyte vitrification after cooled transport of organs was feasible and allowed embryo development. However, the number of collected oocytes and the cleavage rate of matured oocytes were higher when oocyte vitrification was performed without delay after ovary excision, and this should be considered in gamete conservation programs for endangered felids.
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Affiliation(s)
- Martina Colombo
- Dipartimento di Scienze Veterinarie per la Salute, la Produzione Animale e la Sicurezza Alimentare "Carlo Cantoni", Università degli Studi di Milano, Via Celoria 10, 20133 Milan, Italy.
| | - Jennifer Zahmel
- Department of Reproduction Biology, Leibniz-Institute for Zoo and Wildlife Research, Alfred-Kowalke-Str. 17, D-10315, Berlin, Germany.
| | - Claudia Binder
- Obstetrics and Reproduction, Department for Small Animals and Horses, University of Veterinary Medicine, Veterinärplatz 1, 1210, Vienna, Austria.
| | - Johannes Herbel
- Obstetrics and Reproduction, Department for Small Animals and Horses, University of Veterinary Medicine, Veterinärplatz 1, 1210, Vienna, Austria.
| | - Gaia Cecilia Luvoni
- Dipartimento di Scienze Veterinarie per la Salute, la Produzione Animale e la Sicurezza Alimentare "Carlo Cantoni", Università degli Studi di Milano, Via Celoria 10, 20133 Milan, Italy.
| | - Katarina Jewgenow
- Department of Reproduction Biology, Leibniz-Institute for Zoo and Wildlife Research, Alfred-Kowalke-Str. 17, D-10315, Berlin, Germany.
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7
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In Vitro Culture of Embryos from Domestic Cats. Methods Mol Biol 2019. [PMID: 31230285 DOI: 10.1007/978-1-4939-9566-0_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
A variety of protocols are available for the production of feline blastocysts from oocytes that are matured and fertilized in vitro. However, most of these protocols utilize media that were developed for other cell types or the embryos of other species. The protocol outlined in this chapter is based on a series of studies that led to the development of feline optimized culture medium (FOCM), a feline-specific, sequential medium system. The initial embryo culture medium was subsequently modified for both IVM and IVF. Using a small number of stock solutions, a series of media can be easily prepared that allows for immature cat oocytes to be matured and fertilized in vitro, with the resulting embryos developing to the blastocyst stage without the use of serum.
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8
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Shirasawa H, Ono N, Kumazawa Y, Sato W, Sato N, Ihara M, Yaegashi N, Terada Y. Oocyte collection and in vitro maturation after train transportation of human follicular fluid aspirated from resected non-stimulated ovaries of patients with endometrial adenocarcinoma. Reprod Med Biol 2019; 18:180-189. [PMID: 30996682 PMCID: PMC6452027 DOI: 10.1002/rmb2.12265] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 12/20/2018] [Accepted: 12/23/2018] [Indexed: 12/14/2022] Open
Abstract
PURPOSE Immature human oocytes from resected ovaries can be used for research and fertility preservation, though it is unknown whether it is feasible to transport oocytes for these purposes. This study examined in vitro maturation (IVM) outcomes after the transportation of human follicular fluid (HFF) containing oocytes. METHODS Fourteen patients with endometrial adenocarcinoma were enrolled. Oocytes obtained from the resected ovaries of seven patients were transported with HFF by railway (transportation group). Samples of HFF from the other seven patients were not transported, and IVM was performed promptly (non-transportation group). The results of oocyte retrieval and IVM were compared. RESULTS The average ages in the transportation and non-transportation groups were 40.1 ± 2.0 and 39.6 ± 1.8 years, respectively, and the average numbers of collected oocytes were 8.1 ± 8.4 and 5.1 ± 5.1, respectively. There was a significant negative correlation between the number of collected oocytes and age. The proportions of oocytes that reached meiosis II (maturation rate) after IVM were 38.6% and 69.2% in the transportation and non-transportation groups, respectively (P = 0.013). CONCLUSION In this preliminary study, the usefulness of the transportation of HFF was limited. Further studies on maintaining oocyte normality during transportation are necessary for becoming the effective method for research and clinical use.
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Affiliation(s)
- Hiromitsu Shirasawa
- Department of Obstetrics and GynecologyAkita University Graduate School of MedicineAkitaJapan
| | - Natsuki Ono
- Department of Obstetrics and GynecologyAkita University Graduate School of MedicineAkitaJapan
| | - Yukiyo Kumazawa
- Department of Obstetrics and GynecologyAkita University Graduate School of MedicineAkitaJapan
| | - Wataru Sato
- Department of Obstetrics and GynecologyAkita University Graduate School of MedicineAkitaJapan
| | - Naoki Sato
- Department of Obstetrics and GynecologyAkita University Graduate School of MedicineAkitaJapan
| | - Motomasa Ihara
- Department of Obstetrics and GynecologyTohoku University Graduate School of MedicineSendaiJapan
| | - Nobuo Yaegashi
- Department of Obstetrics and GynecologyTohoku University Graduate School of MedicineSendaiJapan
| | - Yukihiro Terada
- Department of Obstetrics and GynecologyAkita University Graduate School of MedicineAkitaJapan
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Alam ME, Iwata J, Fujiki K, Tsujimoto Y, Kanegi R, Kawate N, Tamada H, Inaba T, Sugiura K, Hatoya S. Feline embryo development in commercially available human media supplemented with fetal bovine serum. J Vet Med Sci 2019; 81:629-635. [PMID: 30787208 PMCID: PMC6483925 DOI: 10.1292/jvms.18-0335] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Feline embryo development was examined for 7 days after fertilization using commercially
available human media supplemented with 0.3% bovine serum albumin (BSA) or 5% fetal bovine
serum (FBS). Cumulus-oocyte complexes were categorized as Grades 1, 2, and 3 according to
morphology. Only-One Medium (OM) was used for in vitro culture (IVC) in
OM + BSA, OM + FBS, and OM + BSA/FBS, with BSA supplementation for the first 2 days and
FBS for the subsequent 5 days. Embryos cultured in Early Culture Medium (1–2 days) and
Blastocyst Medium (3–7 days) were defined as EB + BSA and EB + BSA/FBS. The developmental
rate until the blastocyst stage of Grade 1 and 2 oocytes cultured in OM + BSA/FBS was
higher than for the other groups and was significantly higher than for the OM + BSA and EB
+ BSA groups (P<0.01). Grade 3 oocytes cultured in OM + BSA/FBS also
showed the greatest proportion of blastocyst formation. However, FBS supplementation
throughout the IVC period reduced blastocyst number. The percentage of 2 pronuclei after
fertilization as well as blastocyst cell number were significantly higher in Grade 1 and 2
than Grade 3 oocytes when cultured in OM + BSA/FBS (P<0.05). These
results indicate that commercially available OM supplemented with BSA for the first 2 days
of culture and FBS for the subsequent 5 days is suitable for feline embryo development
until the blastocyst stage.
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Affiliation(s)
- Md Emtiaj Alam
- Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka 598-8531, Japan
| | - Jun Iwata
- Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka 598-8531, Japan
| | - Kana Fujiki
- Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka 598-8531, Japan
| | - Yasunori Tsujimoto
- Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka 598-8531, Japan
| | - Ryoji Kanegi
- Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka 598-8531, Japan
| | - Noritoshi Kawate
- Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka 598-8531, Japan
| | - Hiromichi Tamada
- Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka 598-8531, Japan
| | - Toshio Inaba
- Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka 598-8531, Japan
| | - Kikuya Sugiura
- Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka 598-8531, Japan
| | - Shingo Hatoya
- Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka 598-8531, Japan
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10
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Barberino RS, Silva JRV, Figueiredo JR, Matos MHT. Transport of Domestic and Wild Animal Ovaries: A Review of the Effects of Medium, Temperature, and Periods of Storage on Follicular Viability. Biopreserv Biobank 2019; 17:84-90. [DOI: 10.1089/bio.2018.0057] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Affiliation(s)
- Ricássio S. Barberino
- Nucleus of Biotechnology Applied to Ovarian Follicle Development, Federal University of São Francisco Valley, Petrolina, Brazil
| | | | - José Ricardo Figueiredo
- Laboratory of Manipulation of Oocytes and Preantral Follicles (LAMOFOPA), Faculty of Veterinary, State University of Ceará, Fortaleza, Brazil
| | - Maria Helena T. Matos
- Nucleus of Biotechnology Applied to Ovarian Follicle Development, Federal University of São Francisco Valley, Petrolina, Brazil
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11
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Piras AR, Burrai GP, Ariu F, Falchi L, Zedda MT, Pau S, Gadau SD, Antuofermo E, Bebbere D, Ledda S, Bogliolo L. Structure of preantral follicles, oxidative status and developmental competence of in vitro matured oocytes after ovary storage at 4 °C in the domestic cat model. Reprod Biol Endocrinol 2018; 16:76. [PMID: 30097048 PMCID: PMC6087010 DOI: 10.1186/s12958-018-0395-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 08/02/2018] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Storage conditions during transportation of explanted ovaries are a critical step in setting up fertility preservation protocols in both animal and human fields. Here, we evaluated the effects of ovary storage at 4 °C on the preservation of preantral follicles and oocytes retrieved from antral follicles using the domestic cat as model. METHODS Ovaries were harvested from fifty-five healthy domestic queens during ovariectomy and stored at 4 °C for 0 (control), 24, 48, 72 and 96 h. In Experiment 1, the effects of the storage period at 4 °C on the morphology, cytoskeleton (α/β tubulin) and DNA integrity (phosphorylation of histone H2AX) of preantral follicles were investigated. In Experiment 2, oocytes recovered from antral follicles were matured and fertilized in vitro to evaluate their meiotic and developmental competence. Reactive oxygen species (ROS), glutathione (GSH) and lipid peroxidation were measured in matured oocytes. RESULTS The results showed that: a) storage up to 24 h did not affect the morphology and the DNA integrity of preantral follicles; b) extended storage times caused progressive morphological abnormalities, disassembling of microtubules and DNA damage; c) storage up to 48 h did not influence in vitro meiotic maturation of oocytes nor cleavage after in vitro fertilization. However, only oocytes stored within the ovary for 24 h produced blastocysts in a percentage similar to control oocytes; d) GSH levels of in vitro matured oocytes did not change at any time during ovary storage; a progressive increase in ROS levels was detected from 48 h associated with elevated lipid peroxidation at 72 and 96 h of storage. CONCLUSIONS Storage of cat ovaries for up to 24 h caused minimal alteration of preantral follicles and oocytes. The extension of the storage period beyond 24 h progressively impaired the structure of follicles, and modified the oxidative status of in vitro matured oocytes and their developmental competence after in vitro fertilization. This information may help when setting up programs for fertility conservation, especially for wild feline species which die in geographic areas located far away from ARTs centers.
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Affiliation(s)
- Anna Rita Piras
- 0000 0001 2097 9138grid.11450.31Department of Veterinary Medicine, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Giovanni Pietro Burrai
- 0000 0001 2097 9138grid.11450.31Department of Veterinary Medicine, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Federica Ariu
- 0000 0001 2097 9138grid.11450.31Department of Veterinary Medicine, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Laura Falchi
- 0000 0001 2097 9138grid.11450.31Department of Veterinary Medicine, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Maria Teresa Zedda
- 0000 0001 2097 9138grid.11450.31Department of Veterinary Medicine, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Salvatore Pau
- 0000 0001 2097 9138grid.11450.31Department of Veterinary Medicine, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Sergio Domenico Gadau
- 0000 0001 2097 9138grid.11450.31Department of Veterinary Medicine, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Elisabetta Antuofermo
- 0000 0001 2097 9138grid.11450.31Department of Veterinary Medicine, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Daniela Bebbere
- 0000 0001 2097 9138grid.11450.31Department of Veterinary Medicine, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Sergio Ledda
- 0000 0001 2097 9138grid.11450.31Department of Veterinary Medicine, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Luisa Bogliolo
- 0000 0001 2097 9138grid.11450.31Department of Veterinary Medicine, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
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12
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Amstislavsky SY, Kozhevnikova VV, Muzika VV, Kizilova EA. Reproductive biology and a genome resource bank of Felidae. Russ J Dev Biol 2017. [DOI: 10.1134/s1062360417020023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Duncan FE, Zelinski M, Gunn AH, Pahnke JE, O'Neill CL, Songsasen N, Woodruff RI, Woodruff TK. Ovarian tissue transport to expand access to fertility preservation: from animals to clinical practice. Reproduction 2016; 152:R201-R210. [PMID: 27492079 DOI: 10.1530/rep-15-0598] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 08/04/2016] [Indexed: 12/13/2022]
Abstract
Primordial follicles dictate a female's reproductive life span and therefore are central to fertility preservation for both endangered species and individuals with fertility-threatening conditions. Ovarian tissue containing primordial follicles can be cryopreserved and later thawed and transplanted back into individuals to restore both endocrine function and fertility. Importantly, increasing numbers of human live births have been reported following ovarian tissue cryopreservation and transplantation. A current limitation of this technology is patient access to sites that are approved or equipped to process and cryopreserve ovarian tissue - especially in larger countries or low resource settings. Here, we review empirical evidence from both animal models and human studies that suggest that ovarian tissue can be transported at cold temperatures for several hours while still maintaining the integrity and reproductive potential of the primordial follicles within the tissue. In fact, several human live births have been reported in European countries using tissue that was transported at cold temperatures for up to 20 h before cryopreservation and transplantation. Ovarian tissue transport, if implemented widely in clinical practice, could therefore expand both patient and provider access to emerging fertility preservation options.
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Affiliation(s)
- Francesca E Duncan
- Department of Obstetrics and GynecologyFeinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Mary Zelinski
- Oregon National Primate Research CenterBeaverton, Oregon, USA
| | - Alexander H Gunn
- Department of Obstetrics and GynecologyFeinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Jennifer E Pahnke
- Department of Obstetrics and GynecologyFeinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Conor L O'Neill
- Department of Obstetrics and GynecologyFeinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | | | - Ryan I Woodruff
- Department of Obstetrics and GynecologyFeinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Teresa K Woodruff
- Department of Obstetrics and GynecologyFeinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
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14
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Cocchia N, Corteggio A, Altamura G, Tafuri S, Rea S, Rosapane I, Sica A, Landolfi F, Ciani F. The effects of superoxide dismutase addition to the transport medium on cumulus-oocyte complex apoptosis and IVF outcome in cats (Felis catus). Reprod Biol 2014; 15:56-64. [PMID: 25726378 DOI: 10.1016/j.repbio.2014.10.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 08/10/2014] [Accepted: 10/04/2014] [Indexed: 10/24/2022]
Abstract
The aim of the present study was to examine the effects of superoxide dismutase (SOD) addition to the ovary transport medium (4°C, 3-72 h) on ovarian cell viability and apoptosis and in vitro embryo production (IVEP) in domestic cats. The ovaries collected from 76 mixed-breed domestic queens were randomly assigned to the control or SOD-treated groups and incubated for 3, 24, 48 or 72 h. The ovaries were then subjected to the following: (1) fixed in formalin to assess the incidence of apoptosis (fragmented DNA in situ detection kit), (2) stored at -196°C in liquid nitrogen to evaluate the expression of the pro-apoptotic Bax gene and the anti-apoptotic Bcl-2 gene (RT-PCR), and (3) used to obtain the cumulus-oocyte complexes (COCs) in order to test the cell viability (carboxyfluorescein or trypan blue staining) and IVEP. The incidence of apoptosis appeared to be higher in the control compared with the SOD-treated ovaries. The ovarian expression of Bax was lower and the Bcl-2 expression was higher in the SOD-treated group compared with the control group. The presence of SOD in the transport medium increased the viability of COCs and IVEP compared with the control medium. In summary, the supplementation of the ovary transport medium with SOD reduced cellular apoptosis and enhanced COC survival and IVEP in domestic cats.
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Affiliation(s)
- Natascia Cocchia
- Department of Veterinary Medicine and Animal Productions - University of Naples Federico II, Via F. Delpino n. 1, 80137 Naples, Italy
| | - Annunziata Corteggio
- Department of Veterinary Medicine and Animal Productions - University of Naples Federico II, Via F. Delpino n. 1, 80137 Naples, Italy
| | - Gennaro Altamura
- Department of Veterinary Medicine and Animal Productions - University of Naples Federico II, Via F. Delpino n. 1, 80137 Naples, Italy
| | - Simona Tafuri
- Department of Veterinary Medicine and Animal Productions - University of Naples Federico II, Via F. Delpino n. 1, 80137 Naples, Italy
| | - Silviana Rea
- Department of Veterinary Medicine and Animal Productions - University of Naples Federico II, Via F. Delpino n. 1, 80137 Naples, Italy
| | - Isabella Rosapane
- Department of Veterinary Medicine and Animal Productions - University of Naples Federico II, Via F. Delpino n. 1, 80137 Naples, Italy
| | - Alessandro Sica
- Department of Veterinary Medicine and Animal Productions - University of Naples Federico II, Via F. Delpino n. 1, 80137 Naples, Italy
| | | | - Francesca Ciani
- Department of Veterinary Medicine and Animal Productions - University of Naples Federico II, Via F. Delpino n. 1, 80137 Naples, Italy.
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15
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Yıldırım K, Vural MR, Küplülü S, Ozcan Z, Polat IM. The effects of EGF and IGF-1 on FSH-mediated in vitro maturation of domestic cat oocytes derived from follicular and luteal stages. Reprod Biol 2013; 14:122-7. [PMID: 24856471 DOI: 10.1016/j.repbio.2013.11.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2013] [Revised: 11/11/2013] [Accepted: 11/12/2013] [Indexed: 01/05/2023]
Abstract
The objective of this study was to evaluate the influence of epidermal growth factor (EGF) and insulin like growth factor-I (IGF-1) on the in vitro maturation of cat oocytes recovered from follicular and luteal stage ovaries. Oocytes from follicular (n=580) and luteal (n=209) stages were harvested and divided into four groups, which were cultured in FSH-mediated maturation medium supplemented with: (1) EGF alone (25ng/mL); (2) IGF-1 alone (100ng/mL); (3) EGF+IGF-1 (25ng/mL EGF+100ng/mL IGF-I); or (4) no growth factor (control). The proportion of follicular stage oocytes reaching the metaphase II stage was significantly higher than that of oocytes obtained at the luteal stage in both control and study groups (p<0.001). The percentages of oocytes reaching the metaphase II stage during the follicular period were 62.6% in control; 70.9% in EGF; 72.8% in IGF-1, and 78.1% in EGF+IGF-1 groups, whereas the respective values for gametes collected from luteal stage ovaries were 12.5%, 17.5%, 12.5%, and 16.9%. Additionally, the differences between the study and control groups were significant in the case of follicular stage oocytes. Finally, supplementing the maturation medium with EGF and/or IGF-1 significantly enhanced the meiotic maturation of oocytes recovered from follicular stage ovaries. The present study also demonstrated that the combination of EGF and IGF-I provides an additional or synergic effect on meiotic maturation of oocytes recovered from the follicular stage.
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Affiliation(s)
- Koray Yıldırım
- Department of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey
| | - M Rıfat Vural
- Department of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey.
| | - Sükrü Küplülü
- Department of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey
| | - Ziya Ozcan
- Department of Histology and Embriology, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey
| | - I Mert Polat
- Department of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey
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16
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The effect of relaxin supplementation of in vitro maturation medium on the development of cat oocytes obtained from ovaries stored at 4°C. Reprod Biol 2013; 13:122-6. [DOI: 10.1016/j.repbio.2013.04.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Revised: 04/03/2013] [Accepted: 04/03/2013] [Indexed: 11/21/2022]
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17
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Nishijima K, Liu E, Yamaguchi S, Tanaka M, Morimoto M, Watanabe T, Fan J, Kitajima S. Delaying embryo development by storing at 4°C for synchronization to recipients in microinjection technique in rabbits. Lab Anim 2012; 47:53-7. [PMID: 23258842 DOI: 10.1258/la.2012.012097] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Short-term storage of embryos at low temperature induces developmental arrest of the embryo and would appear to be a valuable aid in embryo-transfer techniques to avoid wasting embryos. Embryo storage at 4°C was examined to allow synchronization with embryo-transfer recipients using the microinjection technique. Superovulation was induced in female Japanese White donor rabbits four days before mating with males. At the same time, control recipients were injected with human chorionic gonadotropin (hCG) to allow synchronization (R1); the hCG injections were delayed by 24 h in the experimental group (R2). DNA constructs for expressing human C-reactive protein or apolipoprotein AII were microinjected into the male pronuclei of the ova. The microinjected embryos were immediately transferred to recipients (R1) or stored at 4°C in phosphate-buffered saline containing 10% fetal bovine serum. After 17-20 h, the stored embryos were incubated at 37°C for one hour, and the morphologically normal embryos were transferred to recipients (R2). In the R1 rabbits, 855 embryos were transferred to 29 recipients, and 72.4% of the recipients became pregnant. Seven of the 84 offspring were transgenic. In the R2 rabbits, 478 embryos were transferred to 16 recipients, and 62.5% of the recipients became pregnant. Two of the 39 offspring were transgenic. There were no differences in pregnancy rate, litter size and transgenic integration rate between R1 and R2. These results suggest that the short-term 4°C storage of microinjected embryos can be a valuable method for synchronization with recipients, and reducing wastage of embryos and the sacrifice of rabbits.
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Affiliation(s)
- K Nishijima
- Division of Biological Resources and Development, Analysis Research Center for Experimental Sciences, Saga University, Saga 849-8501, Japan.
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18
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Effect of sericin on preimplantation development of bovine embryos cultured individually. Theriogenology 2012; 78:747-52. [PMID: 22626775 DOI: 10.1016/j.theriogenology.2012.03.021] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Revised: 03/09/2012] [Accepted: 03/19/2012] [Indexed: 11/21/2022]
Abstract
The silk protein sericin has been identified as a potent antioxidant in mammalian cells. This study was conducted to examine the effects of sericin on preimplantation development and quality of bovine embryos cultured individually. When two-cell-stage embryos were cultured individually for 7 days in CR1aa medium supplemented with 0, 0.1, 0.5, or 1% sericin, rates of total blastocyst formation and development to expanded blastocysts from embryos cultured with 0.5% sericin were higher (P < 0.05) than those from embryos cultured with 0 or 1% sericin. When embryos were cultured individually for 7 days in the CR1aa medium supplemented with 0 or 0.5% sericin under two oxidative stress conditions (50 or 100 μm H(2)O(2)), the addition of sericin significantly improved the blastocyst formation rate of embryos exposed to 100 μm H(2)O(2). However, the protective effect of sericin was not observed in development of embryos exposed to 50 μm H(2)O(2). When embryos were exposed to 100 μm H(2)O(2) during culture, the DNA fragmentation index of total blastocysts from embryos cultured with 0.5% sericin was lower than blastocysts derived from embryos cultured without sericin (4.4 vs. 6.8%; P < 0.01). In conclusion, the addition of 0.5% sericin to in vitro culture medium improved preimplantation development and quality of bovine embryos cultured individually by preventing oxidative stress.
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19
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Jin YX, Cui XS, Yu XF, Han YJ, Kong IK, Kim NH. Alterations of spindle and microfilament assembly in aged cat oocytes. Reprod Domest Anim 2011; 45:865-71. [PMID: 21457360 DOI: 10.1111/j.1439-0531.2009.01400.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
To obtain insights into the cytoplasmic maturation status of cat oocytes recovered from cat ovaries following hormone treatment, we first examined microtubule and microfilament assembly in cat oocytes recovered from hormone-treated ovaries at various stages of maturation. Additionally, we determined the alteration of spindle and microfilament assembly, as well as mitogen-activated protein kinase (MAPK) activity, in cat oocytes at 0, 6, 12 and 18 h of further maturation in vitro. We then looked at pronuclear formation and cleavage of these oocytes following parthenogenetic activation. Similar to other species, microtubules are present in germinal vesicle (GV) stage cat oocytes, and following GV breakdown, microtubules encompassed condensed chromatin particles to form the meiotic metaphase spindle. Microfilaments were located in the cortex and around the GV. A microfilament-rich area, in which the chromatin is located, was observed in the oocytes during meiotic maturation. Maturation rates in aged oocytes (cultured for 18 h) were increased when compared with that in relatively fresh oocytes (<12 h culture), and the number of oocytes with abnormal spindle shapes was also increased in aged oocytes. Furthermore, in aged oocytes, the incidence of the metaphase plate observed outside the thick microfilament domain was higher compared with that of young oocytes, and this seemed to result in an increase in the number of oocytes with two pronuclei and one polar body following activation. Western blot analysis revealed a decrease in MAPK activity in aged cat oocytes. Taken collectively, these results suggest that the optimum time for improved cytoplasmic maturation is <12 h in cat oocytes recovered from hormone-treated ovaries.
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Affiliation(s)
- Y-X Jin
- Department of Animal Sciences, Chungbuk National University, Cheongju, Chungbuk, South Korea
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20
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Effect of storage temperature during transport of ovaries on in vitro embryo production in Iberian red deer (Cervus elaphus hispanicus). Theriogenology 2011; 75:65-72. [DOI: 10.1016/j.theriogenology.2010.07.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2009] [Revised: 07/12/2010] [Accepted: 07/18/2010] [Indexed: 11/24/2022]
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21
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Herrick J, Campbell M, Levens G, Moore T, Benson K, D'Agostino J, West G, Okeson D, Coke R, Portacio S, Leiske K, Kreider C, Polumbo P, Swanson W. In Vitro Fertilization and Sperm Cryopreservation in the Black-Footed Cat (Felis nigripes) and Sand Cat (Felis margarita)1. Biol Reprod 2010; 82:552-62. [DOI: 10.1095/biolreprod.109.081034] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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22
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Lunn MO, Wright SJ. Imaging the zona pellucida of canine and feline oocytes using scanning electron microscopy. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2009; 15:2-14. [PMID: 19144252 DOI: 10.1017/s1431927609090084] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Ultrastructure of the zona pellucida (ZP) of canine and feline oocytes has not been fully investigated. The objective of the study was to evaluate the potential use of the low vacuum scanning electron microscope (LVSEM) with oocytes. This required development of a method to prepare canine and feline cumulus-oocyte complexes (COCs) for LVSEM to provide ultrastructural information on the ZP. COCs were collected from ovaries, and cumulus cells were either partially or completely removed to reveal the ZP. COCs and zona-intact oocytes were fixed at 4 degrees C for 1 h in 2.5% glutaraldehyde in 0.1 M sodium cacodylate buffer, pH 7.4 and subsequently viewed wet or further processed by critical point drying, and viewed uncoated or sputter coated with gold. Although the spongy surface of the ZP was visible at low vacuum in uncoated oocytes, coated oocytes had more details at high vacuum. The ZP surface of canine and feline oocytes contained numerous various-sized, spherical or elliptical pores that narrowed centripetally splitting into several smaller, deep pores. The round to oblong cumulus cells tightly surrounded the ZP. Each corona radiata cumulus cell tapered into a thin projection that entered the ZP. Our detailed techniques will enable future studies connecting ultrastructural and molecular aspects of oocyte maturation and development in mammals.
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Affiliation(s)
- Matthew O Lunn
- Department of Biology, University of Dayton, 300 College Park Avenue, Dayton, OH 45469-2320, USA
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23
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Evecen M, Cirit U, Demir K, Karaman E, Hamzaoğlu AI, Bakirer G. Developmental competence of domestic cat oocytes from ovaries stored at various durations at 4 degrees C temperature. Anim Reprod Sci 2009; 116:169-72. [PMID: 19231113 DOI: 10.1016/j.anireprosci.2009.01.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2008] [Revised: 01/07/2009] [Accepted: 01/19/2009] [Indexed: 11/29/2022]
Abstract
Temporal storage of ovaries can provide opportunity to rescue oocytes from ovaries of endangered felids. The objective of the study was to examine the effect of different storage periods (2, 24 and 48h) of ovaries at 4 degrees C for maturation of cat oocytes in vitro. Ovaries were collected from 25 domestic cats at various stages of the estrous cycle by routine ovariohysterectomy following anesthesia at different local veterinary clinics, and maintained in physiological saline at 4 degrees C for 2, 24 or 48h until oocytes recovery. Selected COCs were maturated at 38 degrees C for 48h in four-well petri dishes, which included 500microL modified synthetic oviduct fluid (mSOF) medium under mineral oil in a humidified 5% CO(2), 5% O(2), and 90% N(2) atmosphere incubator. After the in vitro maturation period, there were no differences between the rate of oocytes matured at MII stages in 2 and 24h storage groups (50.7% and 48.2% respectively, p>0.05). However, the same result for the 48h group was significantly lower than the 2 and 24h groups (28.0%, p<0.001). Our results suggest that while 2 or 24h storage of ovaries at 4 degrees C does not affect the meiotic competence of oocytes in vitro, 48h storage of ovaries decrease the results dramatically.
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Affiliation(s)
- Mithat Evecen
- Department of Reproduction and Artificial Insemination, Istanbul University, Avcilar, Turkey
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24
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Nagano M, Uchikura K, Takahashi Y, Hishinuma M. Effect of duration of in vitro maturation on nuclear maturation and fertilizability of feline oocytes. Theriogenology 2007; 69:231-6. [PMID: 18029000 DOI: 10.1016/j.theriogenology.2007.09.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2007] [Revised: 09/04/2007] [Accepted: 09/18/2007] [Indexed: 11/26/2022]
Abstract
This study was conducted to improve in vitro production of embryos from domestic cats using TCM-199 as an IVM medium. The time sequence of nuclear maturation and the optimal timing of in vitro insemination were examined. Most oocytes were at the germinal vesicle stage immediately after collection; however, 8.3% had already resumed meiosis before IVM culture. After 30 h of IVM culture, the percentage of oocytes at metaphase II (MII) reached a peak (75.5%) and did not change (P>0.05) from 30 to 48 h after IVM culture. The percentage of oocytes with two pronuclei was higher (P<0.05) for oocytes matured for 30 and 36 h (38.2 and 33.0%, respectively) than for those after IVM culture for only 24 h (18.5%). Total sperm penetration rate was highest (P<0.05) for oocytes that had been matured for 30 h (46.1%). After 30 h of IVM and 18 h of IVF culture, 66.3 and 24.8% of inseminated oocytes had cleaved and developed to the blastocyst stage, respectively. We concluded that IVM of feline oocytes for 30 h in TCM-199 resulted in optimal nuclear maturation and sperm penetration.
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Affiliation(s)
- M Nagano
- Department of Theriogenology, School of Veterinary Medicine, Faculty of Agriculture, Tottori University, Tottori, Japan.
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