1
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Ochota M, Kulus MJ, Młodawska W, Kardasz-Kamocka M, Haczkiewicz-Leśniak K, Podchorska-Okołów M, Niżański W. Ultrastructural changes in feline oocytes during ovary storage for 24- and 48-hours. Theriogenology 2023; 197:101-110. [PMID: 36481579 DOI: 10.1016/j.theriogenology.2022.11.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 11/16/2022] [Accepted: 11/17/2022] [Indexed: 11/27/2022]
Abstract
Despite established microscopic markers of feline oocyte quality, little is known about their ultrastructural traits. To the best of our knowledge, there is no published report analysing the effect of 24 and 48 h ovarian storage time on the domestic cat oocytes characteristics at the ultrastructural level. Oocytes (n = 30) were classified using the light microscopy as good or bad quality and then proceeded for TEM observations. The location, shape, size and distribution of each organelle was noted in each examined oocyte. In in good quality oocytes the cytoplasmic organelles were generally easier to identify, and furthermore its distribution pattern was more obvious to spot than in bad quality ones. Whereas bad quality oocytes were typically characterised by the lower visibility of the cellular structures and cytoplasmic architecture was less apparent and often arranged without a predictable pattern. In good quality oocytes obtained from fresh ovaries cytoplasmic vacuoles (CVs) occupied a significantly larger area (0,72 vs. 0.18 CVs/μm2, respectively) than in bad quality ones, whereas in bad quality and stored oocytes more cytoplasm was occupied by lipid droplets (LDs) than in fresh good oocytes (0,22 ± 0,09 vs. 0,09 ± 0,05 respectively). It can be concluded that ultrastructure changes in feline oocytes during 24 and 48 h ovarian storage cannot be assessed in light microscopy. The ultrastructure of oocytes was seriously disturbed after 48 h of ovary storage, despite being classified as good quality. However, further investigations utilizing more cells are necessary to confirm reported traits of ultrastructure changes in stored and non-stored oocytes of good and bad quality.
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Affiliation(s)
- Małgorzata Ochota
- Department of Reproduction and Clinic of Farm Animals, Wroclaw University of Environmental and Life Sciences, Faculty of Veterinary Medicine, 50-366, Wrocław, Poland
| | - Michał Jerzy Kulus
- Division of Ultrastructural Research, Wroclaw Medical University, 50-368, Wrocław, Poland
| | - Wiesława Młodawska
- Department of Animal Reproduction, Anatomy and Genomics, University of Agriculture in Krakow, 30-059, Kraków, Poland
| | - Marta Kardasz-Kamocka
- Department of Reproduction and Clinic of Farm Animals, Wroclaw University of Environmental and Life Sciences, Faculty of Veterinary Medicine, 50-366, Wrocław, Poland
| | | | | | - Wojciech Niżański
- Department of Reproduction and Clinic of Farm Animals, Wroclaw University of Environmental and Life Sciences, Faculty of Veterinary Medicine, 50-366, Wrocław, Poland.
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2
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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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3
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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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4
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Piras AR, Ariu F, Falchi L, Zedda MT, Pau S, Schianchi E, Paramio M, Bogliolo L. Resveratrol treatment during maturation enhances developmental competence of oocytes after prolonged ovary storage at 4 °C in the domestic cat model. Theriogenology 2020; 144:152-157. [PMID: 31951984 DOI: 10.1016/j.theriogenology.2020.01.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 12/24/2019] [Accepted: 01/05/2020] [Indexed: 01/04/2023]
Abstract
Resveratrol (Resv; 3,4,5-trihydroxy-trans-stilbene) is a phytoalexin with antioxidant activity that modulates redox homeostasis in oocytes and improves in vitro embryo production. Cold storage of cat ovaries for a period longer than 24 h alters oxidative status of oocytes after in vitro maturation and reduces their developmental competence. The aim of this study was to evaluate the effect of resveratrol supplementation to the maturation medium on embryo development of oocytes after storage of domestic cat ovaries at 4 °C for 24 h or 48 h. Cumulus-oocyte complexes (COCs) were recovered from ovaries of domestic queens and cultured in maturation medium supplemented with (+) or without (-) 5 μM resveratrol for 24 h. COCs collected from fresh ovaries were matured in vitro (IVM) in standard conditions as control. After IVM, oocytes were in vitro fertilized (IVF) and presumptive zygotes cultured for 7 days. Oocyte nuclear maturation, reactive oxygen species (ROS) and glutathione (GSH) levels as well as cleavage, blastocyst formation and blastocyst cell number were determined. There were no differences in the maturation rates of oocytes between the control and stored groups, irrespective of resveratrol supplementation. Resveratrol treatment during IVM significantly increased the level of GSH and reduced the level of ROS of oocytes recovered from ovaries stored for 48 h as compared to the non-treated group (48 h-). The rate of blastocyst formation from oocytes recovered from ovaries after 48 h storage that underwent IVM with resveratrol was higher (P < 0.05) than that of oocytes matured without resveratrol and similar to that of control oocytes. Resveratrol treatment increased (P < 0.05) cell number in blastocysts from 24 h + and 48 h + groups as compared to their respective counterparts. In conclusion, our results demonstrated that resveratrol supplementation during IVM can reverse the adverse effect of oxidative stress on oocytes, and enhances embryo development after ovary storage at 4 °C for 48 h. These results may provide a basis for improving culture conditions and extend the possibility of storage of cat ovaries for more than 24 h thus ensuring successful in vitro embryo production.
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Affiliation(s)
- Anna Rita Piras
- University of Sassari, Department of Veterinary Medicine, 07100, Sassari, Italy
| | - Federica Ariu
- University of Sassari, Department of Veterinary Medicine, 07100, Sassari, Italy.
| | - Laura Falchi
- University of Sassari, Department of Veterinary Medicine, 07100, Sassari, Italy
| | - Maria Teresa Zedda
- University of Sassari, Department of Veterinary Medicine, 07100, Sassari, Italy
| | - Salvatore Pau
- University of Sassari, Department of Veterinary Medicine, 07100, Sassari, Italy
| | - Eleonora Schianchi
- University of Sassari, Department of Veterinary Medicine, 07100, Sassari, Italy
| | - MariaTeresa Paramio
- Universitat Autònoma de Barcelona, Departament de Ciència Animal i Dels Aliments, 08193, Bellaterra, Barcelona, Spain
| | - Luisa Bogliolo
- University of Sassari, Department of Veterinary Medicine, 07100, Sassari, Italy
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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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6
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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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7
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Sowińska N, Müller K, Niżański W, Jewgenow K. Mitochondrial characteristics in oocytes of the domestic cat (Felis catus
) after in vitro maturation and vitrification. Reprod Domest Anim 2017; 52:806-813. [DOI: 10.1111/rda.12982] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 03/16/2017] [Indexed: 11/28/2022]
Affiliation(s)
- N Sowińska
- Department of Reproduction Biology; Leibniz Institute for Zoo and Wildlife Research; Berlin Germany
- Department of Reproduction and Clinic of Farm Animals; Wroclaw University of Environmental and Life Science; Wroclaw Poland
- Center of Experimental and Innovative Medicine; University Center of Veterinary Medicine JU-AU; University of Agriculture in Krakow; Krakow Poland
| | - K Müller
- Department of Reproduction Biology; Leibniz Institute for Zoo and Wildlife Research; Berlin Germany
| | - W Niżański
- Department of Reproduction and Clinic of Farm Animals; Wroclaw University of Environmental and Life Science; Wroclaw Poland
| | - K Jewgenow
- Department of Reproduction Biology; Leibniz Institute for Zoo and Wildlife Research; Berlin Germany
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8
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Snoeck F, Sarrazin S, Wydooghe E, Van Soom A. Age and anti-Müllerian hormone levels predict the success of in vitro maturation of cat oocytes. Reprod Domest Anim 2016; 52 Suppl 2:98-102. [DOI: 10.1111/rda.12827] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- F Snoeck
- Department of Reproduction, Obstetrics and Herd Health; Faculty of Veterinary Medicine; Ghent University; Merelbeke Belgium
| | - S Sarrazin
- Department of Reproduction, Obstetrics and Herd Health; Faculty of Veterinary Medicine; Ghent University; Merelbeke Belgium
| | - E Wydooghe
- Department of Reproduction, Obstetrics and Herd Health; Faculty of Veterinary Medicine; Ghent University; Merelbeke Belgium
| | - A Van Soom
- Department of Reproduction, Obstetrics and Herd Health; Faculty of Veterinary Medicine; Ghent University; Merelbeke Belgium
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9
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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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10
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IZUMI T, SAKAKIDA S, MURANISHI Y, NAGAI T. Allometric Study on the Relationship between the Growth of Ovarian Follicles and Oocytes in Domestic Cats. J Reprod Dev 2012; 58:484-9. [DOI: 10.1262/jrd.2012-030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Tokukazu IZUMI
- Laboratory of Animal Reproduction, Ishikawa Prefectural University, Ishikawa 921-8836, Japan
- Center for Fetal DNA Diagnosis from Maternal Blood, Kanazawa Medical University, Ishikawa 920-0293, Japan
| | - Seishi SAKAKIDA
- Laboratory of Animal Reproduction, Ishikawa Prefectural University, Ishikawa 921-8836, Japan
| | - Yuki MURANISHI
- Department of Developmental Biology, Osaka Bioscience Institute, Osaka 565-0874, Japan
- Present: Unité Mixte de Recherche 1019, Unité de Nutrition Humaine, Institut National de la Recherche Agronomique, Centre de Recherche de Clermont-Ferrand/Theix, 63122 Saint Genès Champanelle, France
| | - Takashi NAGAI
- NARO Institute of Livestock and Grassland Science, Ibaraki 305-0901, Japan
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11
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Prediction of maturational competence of feline oocytes using supravital staining of cumulus cells by propidium iodide. ZYGOTE 2011; 20:333-7. [PMID: 21729378 DOI: 10.1017/s096719941100027x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We examined the relationship between integrity of cumulus cells and nuclear maturation rate after in vitro culture to determine a non-invasive prediction of the maturational competence of feline oocytes. Feline cumulus-oocyte complexes (COCs) were collected from either small (400-800 μm) or large (≥800 μm) follicles. Immediately after collection, cumulus cells were evaluated morphologically (thickness of cumulus cell layers) and stained with propidium iodide (PI), which penetrates only non-viable cells. Cumulus cells without PI staining were judged as having good membrane integrity. After evaluation, COCs were cultured for 30 h and their nuclear maturation rate was determined. The nuclear maturation rate of oocytes derived from large follicles (89.8%) was higher (p < 0.05) than that from small follicles (60.8%). There was no difference in the maturation rate of oocytes from follicles with the same size regardless of cumulus morphology. In contrast, oocytes that had cumulus cells with good membrane integrity showed a higher maturation rate (93.8%) than oocytes with poor cumulus integrity (76.9%) in large follicles (p < 0.05). We conclude that evaluation of membrane integrity of cumulus cells by propidium iodide staining can be used to predict the maturational competence of oocytes.
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12
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Uchikura K, Nagano M, Hishinuma M. The effect of ovarian status and follicular diameter on maturational ability of domestic cat oocytes. J Vet Med Sci 2010; 73:561-6. [PMID: 21173554 DOI: 10.1292/jvms.10-0381] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The objective of this study was to clarify the effect of ovarian status and follicular size on morphological normality and maturational ability of cat oocytes. Ovarian status was classified into inactive, follicular, luteal and prepubertal, and follicles were classified into three groups according to their diameter (400-800, 800-1200 and 1200-2000 µm). In each ovarian status, the number of follicles decreased but the percentage of morphologically normal oocytes increased with the growth of follicles (p<0.05). Only a single follicle that was 1200-2000 µm in diameter was observed in two of the five prepubertal cats. In follicles that were 800-1200 µm in diameter, the percentage of normal oocytes and maturation rate were higher in prepubertal cats than in mature cats (p<0.05). Oocyte diameter tended to increase with the growth of follicles. After oocytes were cultured individually in droplets of maturation medium, the oocyte maturation rate increased with the growth of follicles in each ovarian status (p<0.05). In conclusion, oocytes collected from larger follicles possess higher maturational ability in vitro in sexually mature cats. In prepubertal cats, a higher maturation rate can be obtained from oocytes derived from small follicles compared with in mature cats.
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Affiliation(s)
- Kenzo Uchikura
- Department of Theriogenology, School of Veterinary Medicine, Faculty of Agriculture, Tottori University, 4–101 Koyama-Minami,Tottori 680–8553, Japan
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13
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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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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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Reynaud K, Gicquel C, Thoumire S, Chebrout M, Ficheux C, Bestandji M, Chastant-Maillard S. Folliculogenesis and morphometry of oocyte and follicle growth in the feline ovary. Reprod Domest Anim 2008; 44:174-9. [PMID: 19055566 DOI: 10.1111/j.1439-0531.2007.01012.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
This study was designed to describe, both quantitatively (morphometry) and qualitatively (histological differentiation), follicle and oocyte growth in the feline ovary. The ovaries of 43 cats were collected and processed for histology. The diameters of 832 follicle/oocyte pairs were measured, with and without zona pellucida (ZP), and a special emphasis was placed on the study of early folliculogenesis. Primordial, primary, secondary, pre-antral and early antral follicles were measured at 44.3, 86.2, 126.0, 155.6 and 223.8 microm in diameter respectively. A biphasic pattern of follicle and oocyte growth was observed. Before antrum formation, follicle (x) and oocyte (y) size were positively and linearly correlated (y = 0.500x + 20.01, r(2) = 0.89). Antrum formation occurred when the follicle reached 160-200 microm in diameter (when oocyte was at 102 microm). After antrum formation, a decoupling was observed, a minimal increase in oocyte size contrasting with a significant follicle development (y = 0.001x + 114.39, r(2) = 0.01). The pre-ovulatory follicle diameter was approximately 3500 microm and the maximal oocyte diameter was 115 microm. The ZP, absent in primordial and primary follicles, appeared at the secondary stage and reached almost 6 microm at the pre-ovulatory stage. These results suggest that (i) in feline ovary, follicle and oocyte growth pattern is similar to that observed in other mammals; (ii) the antrum forms in 160-200 microm follicles, which represents 5% of the pre-ovulatory diameter and (iii) the oocyte had achieved more than 90% of its maximal growth at the stage of antrum formation.
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Affiliation(s)
- K Reynaud
- UMR 1198 INRA/ENVA/CNRS Biologie du Développement et Reproduction, Ecole Nationale Vétérinaire d'Alfort, 7 Avenue du Général de Gaulle, Maisons-Alfort Cedex, France.
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Naoi H, Otoi T, Shimamura T, Karja NWK, Agung B, Shimizu R, Taniguchi M, Nagai T. Developmental competence of cat oocytes from ovaries stored at various temperature for 24 h. J Reprod Dev 2006; 53:271-7. [PMID: 17139136 DOI: 10.1262/jrd.18115] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We conducted two experiments to investigate the effects of storage temperature and period for cat ovaries on the meiotic and developmental competence of oocytes collected from the ovaries. In Experiment 1, ovaries were stored in physiological saline for 24 h at 4 C, 23-25 C, or 38 C (cold, room, and incubator temperature groups, respectively), and then oocytes were collected from the ovaries in each group. Morphologically intact oocytes were then selected and cultured in maturation medium for 24 h. Significantly more oocytes reached metaphase II (MII) in the cold temperature group (53.4%) than in the room and incubator temperature groups (20.0 and 2.4%, respectively). In Experiment 2, ovaries were stored in physiological saline at room temperature for 0, 6, 12 or 18 h, and then they were stored at 4 C (cold storage) until reaching a total storage period of 24 h. After storage of the ovaries, morphologically intact oocytes were matured, fertilized with frozen-thawed spermatozoa, and cultured in vitro. The rates of morphologically intact oocytes obtained from the ovaries stored at room temperature for 0, 6, 12 or 18 h were 35.3, 30.0, 26.4 and 14.7%, respectively, and the rates of intact oocytes that reached MII were 63.2, 36.4, 26.5 and 11.9%, respectively. The results suggested that the numbers of morphologically intact oocytes and intact oocytes that reached MII after in vitro maturation decrease gradually as the period of storage at room temperature before cold storage increases. Only oocytes from ovaries stored for 6 h developed to the blastocyst stage after in vitro maturation and fertilization when ovaries were stored at room temperature before cold storage. These results indicate that 24 h storage of ovaries at high temperatures (>23 C) decreases the meiotic competence of oocytes. The quality and developmental competence of oocytes are influenced by the length of storage at room temperature before cold storage.
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Affiliation(s)
- Hideaki Naoi
- Laboratory of Animal Reproduction, United Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
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Abstract
Appreciable progress has been made in the development of assisted reproductive technology (ART) for creating in vitro embryos in cats. Moreover, the extent of advancement in the last decade has been similar, albeit of more modest magnitude, to that seen in some other domestic and laboratory species, particularly when the disparities in financial, and, hence, scientific, resources are considered. The recent progress in domestic felid ART has made it possible to envisage their potential role in supporting the conservation of endangered felid species, which, in reality, is a multifarious process requiring wide-ranging, yet coordinated approaches. The prospect of incorporating ART into that intricate domain, with limited exceptions, remains a long-term, but highly motivating objective. Meanwhile, the straightforward accessibility and abundant supply of domestic cat gametes from local veterinary clinics provides a valuable and practical source of material for further research on the basic aspects of in vitro oocyte maturation, fertilization and early embryo development. Furthermore, extrapolating the domestic biotechniques to non-domestic felids has produced encouraging results in some species.
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Affiliation(s)
- C E Pope
- Audubon Nature Institute Center for Research of Endangered Species, New Orleans, LA 70131, USA.
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Karja NWK, Otoi T, Murakami M, Fahrudin M, Suzuki T. In vitro maturation, fertilization and development of domestic cat oocytes recovered from ovaries collected at three stages of the reproductive cycle. Theriogenology 2002; 57:2289-98. [PMID: 12141577 DOI: 10.1016/s0093-691x(02)00905-6] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This study was conducted to examine the effect of the donor cat's reproductive cycle stage on in vitro maturation (IVM), in vitro fertilization (IVF), and in vitro development of oocytes recovered from ovaries that were collected and stored at 35 degrees C for a short period (1-6 h). Based on the presence or absence of follicles and corpora lutea, the ovarian pairs collected were classified into inactive, follicular, or luteal stages. Nuclear status of 161 cumulus-oocyte complexes (COCs) were examined immediately after recovery; 91.3% of the oocytes were found to be at the immature germinal vesicle (GV) stage, and 3.7% of the oocytes were at metaphase II (MII) stage. The percentage of the oocytes at the GV stage was significantly lower in the follicular stage than in the inactive stage (P < 0.01). Of the oocytes from the follicular stage, 9.1% were at MII stage. After culture for 24 h, however, the proportions of oocytes that reached metaphase I and MII were not different among the reproductive cycle stages of the ovaries collected (P > 0.05). After co-incubation with sperm, 63.1% of oocytes were fertilized, but there were no significant differences among the reproductive cycle stages of the ovaries with respect to the proportions of normal and polyspermic fertilization. However, the number of oocytes reaching cleavage stage and development to the morula and blastocyst stages from follicular stage ovaries were significantly lower (P < 0.05) than those obtained from inactive and luteal stage ovaries. These results indicate that the reproductive cycle stage of donor cat ovaries, stored at 35 degrees C, has no apparent effects on the frequencies of maturation and fertilization of oocytes, but influences developmental competence of the oocytes following IVM or IVF.
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Affiliation(s)
- N W K Karja
- Department of Veterinary Sciences, Yamaguchi University, Japan
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