Application of extracellular flux analysis for determining mitochondrial function in mammalian oocytes and early embryos.
Abstract: Mitochondria provide the major source of ATP for mammalian oocyte maturation and early embryo development. Oxygen Consumption Rate (OCR) is an established measure of mitochondrial function. OCR by mammalian oocytes and embryos has generally been restricted to overall uptake and detailed understanding of the components of OCR dedicated to specific molecular events remains lacking. Here, extracellular flux analysis (EFA) was applied to small groups of bovine, equine, mouse and human oocytes and bovine early embryos to measure OCR and its components. Using EFA, we report the changes in mitochondrial activity during the processes of oocyte maturation, fertilisation, and pre-implantation development to blastocyst stage in response to physiological demands in mammalian embryos. Crucially, we describe the real time partitioning of overall OCR to spare capacity, proton leak, non-mitochondrial and coupled respiration - showing that while activity changes over the course of development in response to physiological demand, the overall efficiency is unchanged. EFA is shown to be able to measure mitochondrial function in small groups of mammalian oocytes and embryos in a manner which is robust, rapid and easy to use. EFA is non-invasive and allows real-time determination of the impact of compounds on OCR, facilitating an assessment of the components of mitochondrial activity. This provides proof-of-concept for EFA as an accessible system with which to study mammalian oocyte and embryo metabolism.
Publication Date: 2019-11-14 PubMed ID: 31727902PubMed Central: PMC6856134DOI: 10.1038/s41598-019-53066-9Google Scholar: Lookup
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Summary
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This research applies extracellular flux analysis for understanding the mitochondrial function of various mammalian oocytes and early embryos, including bovines, equine, mouse and humans. The study highlights the changes in mitochondrial activity during the processes of ovule maturation, fertilization, and pre-implantation development in response to physiological demands of mammalian embryos.
Understanding Mitochondrial Function in Mammalian Oocytes and Early Embryos
- The research focuses on how mitochondria, which are the primary source of ATP, work during the maturation of oocytes and the early stages of embryo development in mammals.
- The overall uptake of Oxygen Consumption Rate (OCR) has generally been restricted in mammalian oocytes and embryos, hence, the particular components of OCR related to specific molecular events are not well-understood. This research applies extracellular flux analysis (EFA) to break down and understand these components.
Applying Extracellular Flux Analysis (EFA) to Measure OCR
- EFA is applied to small groups of different types of mammalian oocytes and early embryos, including those belonging to bovine, equine, mouse and humans, in order to measure OCR and its distinct components. This allows for a more detailed understanding of mitochondrial function during crucial stages of development.
- By using EFA, researchers can observe changes in mitochondrial activity during the processes of oocyte maturation, fertilization, and pre-implantation development. These stages respond to physiological demands in mammalian embryos.
Assessing Efficiency and Partitioning of OCR
- Despite changes in activity in different development stages, the overall efficiency of OCR remains constant. Moreover, the partitioning of overall OCR to several components such as spare capacity, proton leak, non-mitochondrial and coupled respiration can be tracked in real-time with EFA.
- The study proves EFA to be a useful, rapid, and robust method for examining mitochondrial function in small groups of mammalian oocytes and embryos. It is also non-invasive and permits real-time evaluation of different compound’s impact on OCR. This assessment can further clarify the different components of mitochondrial activity.
Implications and Future Directions
- Results of the study provide a proof-of-concept for EFA as an accessible system to study mammalian oocyte and embryo metabolism. Due to its non-invasive nature, EFA presents an invaluable tool suitable for more detailed and insightful future research on the mitochondrial function in mammalian oocytes and early embryos.
Cite This Article
APA
Muller B, Lewis N, Adeniyi T, Leese HJ, Brison DR, Sturmey RG.
(2019).
Application of extracellular flux analysis for determining mitochondrial function in mammalian oocytes and early embryos.
Sci Rep, 9(1), 16778.
https://doi.org/10.1038/s41598-019-53066-9 Publication
Researcher Affiliations
- Centre for Atherothrombosis and Metabolic Disease, Hull York Medical School, University of Hull, Hull, HU6 7RX, UK.
- Institute of Aging and Chronic Disease, University of Liverpool, Liverpool, UK.
- Department of Reproductive Medicine, Manchester University NHS Foundation Trust, Manchester Academic Health Sciences Centre UK, Manchester, UK.
- Centre for Atherothrombosis and Metabolic Disease, Hull York Medical School, University of Hull, Hull, HU6 7RX, UK.
- Department of Reproductive Medicine, Manchester University NHS Foundation Trust, Manchester Academic Health Sciences Centre UK, Manchester, UK.
- Maternal and Fetal Health Research Centre, School of Medical Sciences, University of Manchester UK, Manchester, UK.
- Centre for Atherothrombosis and Metabolic Disease, Hull York Medical School, University of Hull, Hull, HU6 7RX, UK. roger.sturmey@hyms.ac.uk.
MeSH Terms
- Animals
- Biosensing Techniques / methods
- Cattle
- Embryo, Mammalian / metabolism
- Embryonic Development
- Female
- Fertilization
- Horses
- Humans
- Mice
- Mitochondria / metabolism
- Oocytes / metabolism
- Oxygen Consumption
Conflict of Interest Statement
The authors declare no competing interests.
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