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Updated: Oct 13, 2026
Assessment of Open Probability of the Mitochondrial Permeability Transition Pore in the Setting of Coenzyme Q Excess
Published on: June 1, 2022
Opening of mitochondrial potassium channels: a new target for graft preservation strategies?
E Kevelaitis1, A Oubenaissa, C Mouas
1Department of Physiology, Kaunas Medical University, Lithuania.
Background:
This study was designed to assess the protective effects of the mitochondrial adenosine triphosphate-sensitive potassium channel (KATP) opener diazoxide as an additive to heart preservation solution.
Methods:
Forty isolated isovolumic buffer-perfused rat hearts were divided into four groups. Groups I and III hearts were arrested with and cold-stored in Celsior solution for 4 hr and 10 hr, respectively. In Groups II and IV, hearts underwent a protocol similar to that used in Group I and III, respectively, except that Celsior was supplemented with 100 micromol/L of diazoxide.
Results:
The protective effects of diazoxide were primarily manifest as a better preservation of diastolic function and a reduction of myocardial edema. The improvement of postischemic systolic function was observed only after prolonged exposure to diazoxide in Group IV, compared with Group III. The endothelium-dependent and endothelium-independent coronary flow postischemic responses were not affected by the supplementation of Celsior with diazoxide.
Conclusions:
Pharmacologic activation of mitochondrial KATP channels seems to be an effective means of improving preservation of cold-stored hearts, which is consistent with the presumed role of these channels as end effectors of the cardioprotective preconditioning pathway.
Insights
Diazoxide, a mitochondrial adenosine triphosphate-sensitive potassium channel (KATP) opener, improves heart preservation by enhancing diastolic function and reducing edema. This additive offers a promising strategy for protecting cold-stored hearts.
Area of Science:
- Cardiology
- Cardiovascular Research
- Organ Preservation
Background:
- Mitochondrial adenosine triphosphate-sensitive potassium channels (KATP) play a role in cardioprotection.
- Diazoxide is a known KATP channel opener.
- Heart preservation solutions aim to minimize ischemic injury.
Purpose of the Study:
- To evaluate the protective effects of diazoxide as an additive to a heart preservation solution.
- To assess the impact of diazoxide on myocardial function and edema during cold storage.
Main Methods:
- Isolated isovolumic buffer-perfused rat hearts were used.
- Four groups were established: control (Celsior solution) and diazoxide-supplemented Celsior.
- Hearts were cold-stored for 4 or 10 hours.
Main Results:
- Diazoxide improved diastolic function and reduced myocardial edema.
- Enhanced systolic function was observed after prolonged diazoxide exposure.
- Coronary flow responses were not significantly affected by diazoxide.
Conclusions:
- Pharmacologic activation of mitochondrial KATP channels with diazoxide enhances heart preservation.
- Diazoxide's protective effects align with its role in the preconditioning pathway.
- Diazoxide is a potential additive for improving cold-stored heart preservation.
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