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A Flow Cytometry-based Assay for Measuring Mitochondrial Membrane Potential in Cardiac Myocytes After Hypoxia/Reoxygenation
Published on: July 13, 2018
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Mitochondrial transplantation attenuates hypoxic pulmonary vasoconstriction
Juan Zhou1,2,3, Jiwei Zhang4, Yankai Lu1,2,5
1Department of Pathophysiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
Oncotarget
|April 29, 2016
Summary
Mitochondrial differences dictate how pulmonary and systemic arteries react to low oxygen. Transplanting mitochondria between these vessels reversed their distinct responses to hypoxia, revealing their critical role.
Area of Science:
- Cardiovascular Biology
- Mitochondrial Physiology
- Vascular Smooth Muscle Function
Background:
- Hypoxia causes pulmonary artery constriction but systemic artery relaxation.
- Mitochondria exhibit functional and structural heterogeneity across cell types.
- Distinct vascular responses to hypoxia suggest underlying cellular differences.
Purpose of the Study:
- To investigate if mitochondrial heterogeneity controls differential responses of pulmonary and systemic artery smooth muscle cells to hypoxia.
- To determine the role of mitochondria in mediating hypoxia-induced vascular tone changes.
Main Methods:
- Mitochondria were isolated and transplanted between rat pulmonary artery smooth muscle cells and femoral artery smooth muscle cells.
- Functional assessments included cell membrane potential, intracellular calcium signaling ([Ca2+]i), and artery constriction/relaxation.
- Reactive oxygen species (ROS) generation and extracellular Ca2+-sensing receptor (CaSR) activation by mitochondria were analyzed.
Main Results:
- Transplanted mitochondria retained function and reversed hypoxia-induced changes in cell signaling and vascular tone.
- Pulmonary artery smooth muscle cells with transplanted systemic mitochondria showed relaxation, and vice versa.
- Differential mitochondrial ROS production and CaSR activation correlated with cell membrane potential and [Ca2+]i changes, driving distinct vascular responses.
Conclusions:
- Mitochondrial heterogeneity is a key determinant of vascular smooth muscle cell behavior under hypoxic conditions.
- Mitochondria directly influence cell membrane potential, calcium signaling, and ultimately, pulmonary and systemic artery tone during hypoxia.
- Targeting mitochondrial function may offer novel therapeutic strategies for hypoxia-related vascular diseases.
