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Stout TAE, Crabtree JR, Cuervo-Arango J. Advances in equine reproduction. Equine Vet J 2024; 56:644-649. [PMID: 38837794 DOI: 10.1111/evj.14102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Accepted: 04/26/2024] [Indexed: 06/07/2024]
Affiliation(s)
- Tom A E Stout
- Department of Clinical Sciences, Utrecht University, Utrecht, The Netherlands
| | | | - Juan Cuervo-Arango
- Equine Fertility Group, Faculty of Veterinary Medicine, Universidad Cardenal-Herrera-CEU, Valencia, Spain
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Luis-Calero M, Fernández-Hernández P, Ortiz-Rodríguez JM, Muñoz-García CC, Jardin I, Macías-García B, González-Fernández L. Description of a new quantitative method to assess mitochondrial distribution pattern in mature equine oocytes. Vet Res Commun 2024; 48:1867-1871. [PMID: 38340267 PMCID: PMC11147904 DOI: 10.1007/s11259-024-10325-z] [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: 11/24/2023] [Accepted: 02/04/2024] [Indexed: 02/12/2024]
Abstract
The Mitochondrial distribution pattern or MDP in mammalian oocytes serves as an indicator of their cytoplasmic maturity, with a heterogeneous pattern associated with mature cytoplasm. Currently, MDP assessment involves fluorescent labelling of mitochondria followed by visual evaluation, as no quantitative method exists. Our objective was to develop a quantitative approach to assess MDP in mature equine oocytes. Equine oocytes, obtained by ovum pick up (OPU) were matured in vitro, and only metaphase II oocytes were used in the study (n = 56). Following denudation, oocytes were fixed, stained with MitoTracker™ Red CMXRos (50 nM in TCM-199 with Hank´s salts and 10% FBS) for 15 min at 38 °C, and then incubated with 2.5 µg/ml Hoechst 33342 for 10 min at 38 °C. Confocal microscope images were acquired, and the oocyte's MDP was visually classified as either homogeneous (HoD; n = 17) or heterogeneous (HeD; n = 39). For quantitative analysis, Fiji-ImageJ software was employed. Background subtraction was performed, and a 1-pixel line along the diameter was drawn to calculate the intensity profile. Fluorescence intensities were normalized, and ratios of peripheral to central fluorescence intensity were determined. Student´s t-test was used for comparations; MDP ratio was (mean ± standard error of the mean): 0.8 ± 0.02 for HoD and 0.3 ± 0.02 for HeD (p < 0.001). These results demonstrate concordance between quantitative and qualitative MDP assessment in mature equine oocytes. Our study describes a new approach to quantify mitochondrial distribution pattern and cytoplasmic maturation in mature equine oocytes.
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Affiliation(s)
- Marcos Luis-Calero
- Departamento de Medicina animal, Grupo de Investigación Medicina Interna Veterinaria (MINVET), Instituto de Investigación INBIO G+C, Universidad de Extremadura, Cáceres, Spain
| | - Pablo Fernández-Hernández
- Departamento de Medicina animal, Grupo de Investigación Medicina Interna Veterinaria (MINVET), Instituto de Investigación INBIO G+C, Universidad de Extremadura, Cáceres, Spain
| | | | - Carmen Cristina Muñoz-García
- Departamento de Medicina animal, Grupo de Investigación Medicina Interna Veterinaria (MINVET), Instituto de Investigación INBIO G+C, Universidad de Extremadura, Cáceres, Spain
| | - Isaac Jardin
- Departamento de Fisiología, Grupo de Investigación Fisiología Celular, Instituto Universitario de Biomarcadores de Patologías Metabólicas y Moleculares (IBPM), Universidad de Extremadura, Cáceres, Spain
| | - Beatriz Macías-García
- Departamento de Medicina animal, Grupo de Investigación Medicina Interna Veterinaria (MINVET), Instituto de Investigación INBIO G+C, Universidad de Extremadura, Cáceres, Spain
| | - Lauro González-Fernández
- Departamento de Bioquímica y Biología Molecular y Genética, Grupo de Investigación Señalización Intracelular y Tecnología de la Reproducción (SINTREP), Instituto de Investigación INBIO G+C, Universidad de Extremadura, Av. de las Ciencias, s/n, Cáceres, 10004, Spain.
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