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Postmortem oxygen consumption by mitochondria and its effects on myoglobin form and stability
Jiali Tang1, Cameron Faustman, Thomas A Hoagland
1Department of Animal Science, University of Connecticut, 3636 Horsebarn Hill Road Ext., Storrs, Connecticut 06269-4040, USA.
Journal of Agricultural and Food Chemistry
|February 17, 2005
Summary
Postmortem bovine cardiac mitochondria lose structural and functional integrity over time. Mitochondrial respiration alters myoglobin forms, influenced by pH, oxygen, and density.
Area of Science:
- Mitochondrial biology
- Biochemistry
- Postmortem tissue analysis
Background:
- Mitochondria are crucial for cellular energy production.
- Myoglobin (Mb) plays a role in oxygen transport and storage in muscle.
- Understanding postmortem changes in cardiac mitochondria is vital for tissue preservation and research.
Purpose of the Study:
- To assess the morphological and functional integrity of postmortem bovine cardiac mitochondria.
- To evaluate the in vitro interaction between mitochondria and myoglobin.
Main Methods:
- Electron microscopy for morphological assessment.
- Measurement of mitochondrial oxygen consumption rate (OCR) and respiratory control ratio.
- In vitro incubation of mitochondria with myoglobin under varying pH and oxygen conditions.
Main Results:
- Mitochondria maintained integrity up to 2 hours postmortem, with degradation thereafter.
- Mitochondrial function (OCR, RCR) declined significantly with prolonged storage and lower pH.
- Mitochondrial respiration altered myoglobin forms (OxyMb to DeoMb/MetMb), dependent on pH, oxygen, and mitochondrial density.
Conclusions:
- Postmortem bovine cardiac mitochondria exhibit progressive structural and functional decline.
- Mitochondrial respiration directly influences myoglobin redox state and form.
- These findings have implications for understanding postmortem muscle biochemistry and potential applications in tissue research.