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Updated: Jun 5, 2026
Multi-parameter Measurement of the Permeability Transition Pore Opening in Isolated Mouse Heart Mitochondria
Published on: September 7, 2012
[Measurement of rat myocardial mitochondria permeability transition with spectrophotometer]
1Institute of Hygiene & Environmental Medicine, Academy of Military Medical Sciences, Tianjin 300050.
Aim:
Mitochondrial permeability transition (MPT) is an important index to indicate the integrity and function of mitochondria. The principle of measurement for MPT is to observe the change of absorbance at 540 nm, due to the swelling of mitochondria by the disturbance of permeability transition of mitochondrial membrane when MPT increase. Consulting the literature and according to the reality in our laboratory, we established a spectrophotometric method for measuring myocardial MPT by using UV-240 spectrophotometer.
Methods:
The decrease of absorbance and the time to equilibrium deltaA/min indicates the change of MPT.
Results And Conclusion:
The results showed that the optimal pH, concentration of protein and temperature for measuring MPT in our laboratory are pH 7.4, 0.5 mg protein/ml of mitochondria and 25 degrees C respectively.
Insights
This study details a spectrophotometric method for measuring mitochondrial permeability transition (MPT), a key indicator of mitochondrial function. Optimal conditions were identified as pH 7.4, 0.5 mg/ml protein concentration, and 25°C.
Area of Science:
- Biochemistry
- Cell Biology
- Spectrophotometry
Context:
- Mitochondrial permeability transition (MPT) is crucial for assessing mitochondrial integrity and function.
- Measuring MPT involves observing absorbance changes at 540 nm due to mitochondrial swelling.
- Established laboratory protocols are essential for accurate MPT assessment.
Purpose:
- To establish a reliable spectrophotometric method for measuring myocardial mitochondrial permeability transition (MPT).
- To optimize conditions for MPT measurement using a UV-240 spectrophotometer in a laboratory setting.
Summary:
- A spectrophotometric method was developed to measure myocardial MPT by monitoring absorbance changes.
- The method relies on observing the decrease in absorbance (deltaA/min) to indicate MPT changes.
- Optimal conditions determined were pH 7.4, 0.5 mg protein/ml mitochondrial concentration, and 25°C.
Impact:
- Provides a standardized method for assessing mitochondrial function in myocardial tissue.
- Facilitates research into conditions affecting mitochondrial integrity.
- Enhances the reliability of MPT measurements in laboratory diagnostics.
