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Oliveira I, Fisch J, Gomes J, Lopes RFF, Oliveira ATDD. Selection of Rattus norvegicus cumulus-oocyte complex for vitrification by brilliant cresyl blue. ZYGOTE 2023; 31:483-490. [PMID: 37449710 DOI: 10.1017/s0967199423000394] [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] [Indexed: 07/18/2023]
Abstract
The influence of the method of evaluating developmentally competent oocytes on their viability after cryopreservation still needs to be better understood. The objective of this study was to determine the cleavage and embryo developmental rates after parthenogenetic activation of cumulus-oocyte complexes (COCs) selected by different concentrations of brilliant cresyl blue (BCB) and cryopreservation. In the first experiment, COCs were separated into groups and incubated for 1 h in medium containing BCB (13 μM, 16 μM, or 20 μM). The control group was not exposed to BCB staining. In the second experiment, COCs were divided into four groups: 13 μM BCB(+), 13 μM BCB(-), fresh control (selected by morphologic observation and immediately in vitro matured) and vitrified control (selected by morphologic evaluation, vitrified, and in vitro matured). In the first experiment, the 13 μM BCB group displayed greater development rates at the morula stage (65.45%, 36/55) when compared with the other groups. In the second experiment, cleavage (47.05%, 72/153) and morula development (33.55%, 51/153) of the control group of fresh COCs were increased compared with the other groups. However, when comparing morula rates between vitrified COC control and BCB(+) groups, the BCB(+) group had better results (19.23%, 5/26 and 64.7%, 11/17, respectively). Our best result in rat COC selection by BCB staining was obtained using a concentration of 13 μM. This selection could be a valuable tool to improve vitrification outcomes, as observed by the BCB(+) group that demonstrated better results compared with the vitrified COC control.
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Affiliation(s)
- Iaskara Oliveira
- PPG - Ciências da Saúde - Universidade Federal de Ciências da Saúde de Porto Alegre -UFCSPA, Porto Alegre, RS, Brazil
| | - Joana Fisch
- PPG - Ciências da Saúde - Universidade Federal de Ciências da Saúde de Porto Alegre -UFCSPA, Porto Alegre, RS, Brazil
| | - Juliana Gomes
- Laboratório de Biotecnologia Animal Aplicada- Universidade Federal do Rio Grande do Sul-UFRGS, Porto Alegre, RS, Brazil
| | - Rui Fernando Felix Lopes
- Laboratório de Biotecnologia Animal Aplicada- Universidade Federal do Rio Grande do Sul-UFRGS, Porto Alegre, RS, Brazil
| | - Alexandre Tavares Duarte de Oliveira
- PPG - Ciências da Saúde - Universidade Federal de Ciências da Saúde de Porto Alegre -UFCSPA, Porto Alegre, RS, Brazil
- Laboratório de Biotecnologia Animal Aplicada- Universidade Federal do Rio Grande do Sul-UFRGS, Porto Alegre, RS, Brazil
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Tessaro I, Modina SC, Crotti G, Franciosi F, Colleoni S, Lodde V, Galli C, Lazzari G, Luciano AM. Transferability and inter-laboratory variability assessment of the in vitro bovine oocyte fertilization test. Reprod Toxicol 2015; 51:106-13. [PMID: 25625651 DOI: 10.1016/j.reprotox.2015.01.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Revised: 12/16/2014] [Accepted: 01/06/2015] [Indexed: 11/28/2022]
Abstract
The dramatic increase in the number of animals required for reproductive toxicity testing imposes the validation of alternative methods to reduce the use of laboratory animals. As we previously demonstrated for in vitro maturation test of bovine oocytes, the present study describes the transferability assessment and the inter-laboratory variability of an in vitro test able to identify chemical effects during the process of bovine oocyte fertilization. Eight chemicals with well-known toxic properties (benzo[a]pyrene, busulfan, cadmium chloride, cycloheximide, diethylstilbestrol, ketoconazole, methylacetoacetate, mifepristone/RU-486) were tested in two well-trained laboratories. The statistical analysis demonstrated no differences in the EC50 values for each chemical in within (inter-runs) and in between-laboratory variability of the proposed test. We therefore conclude that the bovine in vitro fertilization test could advance toward the validation process as alternative in vitro method and become part of an integrated testing strategy in order to predict chemical hazards on mammalian fertility.
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Affiliation(s)
- Irene Tessaro
- Reproductive and Developmental Biology Laboratory, Department of Health, Animal Science and Food Safety, University of Milan, 20133 Milan, Italy
| | - Silvia C Modina
- Reproductive and Developmental Biology Laboratory, Department of Health, Animal Science and Food Safety, University of Milan, 20133 Milan, Italy; Interdepartmental Research Centre for the Study of Biological Effects of Nano-Concentrations (CREBION), University of Milan, 20133 Milan, Italy
| | - Gabriella Crotti
- Avantea, Laboratory of Reproductive Technologies, 26100 Cremona, Italy
| | - Federica Franciosi
- Reproductive and Developmental Biology Laboratory, Department of Health, Animal Science and Food Safety, University of Milan, 20133 Milan, Italy
| | - Silvia Colleoni
- Avantea, Laboratory of Reproductive Technologies, 26100 Cremona, Italy
| | - Valentina Lodde
- Reproductive and Developmental Biology Laboratory, Department of Health, Animal Science and Food Safety, University of Milan, 20133 Milan, Italy
| | - Cesare Galli
- Avantea, Laboratory of Reproductive Technologies, 26100 Cremona, Italy; Dipartimento di Scienze Mediche Veterinarie, Università di Bologna, 40064 Bologna, Italy; Fondazione Avantea, Cremona, Italy
| | - Giovanna Lazzari
- Avantea, Laboratory of Reproductive Technologies, 26100 Cremona, Italy; Fondazione Avantea, Cremona, Italy
| | - Alberto M Luciano
- Reproductive and Developmental Biology Laboratory, Department of Health, Animal Science and Food Safety, University of Milan, 20133 Milan, Italy; Interdepartmental Research Centre for the Study of Biological Effects of Nano-Concentrations (CREBION), University of Milan, 20133 Milan, Italy.
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