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Study of Endoplasmic Reticulum and Mitochondria Interactions by In Situ Proximity Ligation Assay in Fixed Cells
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DIAPH1-MFN2 interaction regulates mitochondria-SR/ER contact and modulates ischemic/hypoxic stress
Gautham Yepuri1, Lisa M Ramirez2, Gregory G Theophall2
1Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, NYU Grossman School of Medicine, New York, New York, 10016, USA.
Nature Communications
|October 31, 2023
Summary
Diaphanous-1 (DIAPH1) protein interacts with Mitofusin-2 (MFN2) to regulate mitochondria-ER contact, crucial for cellular health. Targeting this DIAPH1-MFN2 interaction may aid recovery from tissue ischemia.
Area of Science:
- Cell Biology
- Molecular Biology
- Physiology
Background:
- Inter-organelle communication between mitochondria and the sarco/endoplasmic reticulum (SR/ER) is vital for cellular homeostasis.
- This communication network is disrupted during tissue ischemia, a condition causing significant cellular damage.
Purpose of the Study:
- To investigate the role of the formin Diaphanous-1 (DIAPH1) in regulating mitochondria-SR/ER contact.
- To determine if DIAPH1-MFN2 interactions influence cellular responses to ischemia.
Main Methods:
- Biochemical assays to confirm DIAPH1 and Mitofusin-2 (MFN2) interaction.
- Solution structure studies to elucidate the interaction interface.
- Cellular and molecular analyses in cardiomyocytes, endothelial cells, and macrophages.
- Studies involving synthetic constructs to modulate mitochondria-SR/ER distance.
Main Results:
- DIAPH1 directly interacts with MFN2, shortening the distance between mitochondria and SR/ER, thus enhancing their contact.
- This interaction regulates mitochondrial turnover, mitophagy, and oxidative stress in cardiomyocytes.
- Artificial shortening of mitochondria-SR/ER distance mimicked beneficial effects of DIAPH1 modulation during ischemia.
Conclusions:
- The DIAPH1-MFN2 interaction is a key regulator of mitochondria-SR/ER contact networks.
- Targeting DIAPH1-MFN2 pathways offers a potential therapeutic strategy for improving recovery from tissue ischemia.
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