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Updated: Aug 17, 2025

Study of Endoplasmic Reticulum and Mitochondria Interactions by In Situ Proximity Ligation Assay in Fixed Cells
Published on: December 10, 2016
Endosomal lipid signaling reshapes the endoplasmic reticulum to control mitochondrial function
Wonyul Jang1, Dmytro Puchkov1, Paula Samsó1
1Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany.
MTM1 regulates cell adaptation to nutrient changes by controlling endosomal signaling. This impacts endoplasmic reticulum shape, mitochondrial function, and metabolism during starvation.
Area of Science:
- Cell Biology
- Molecular Biology
- Metabolism
Background:
- Cells adapt metabolism and organelle dynamics to nutrient fluctuations.
- The orchestration of these cell-wide adaptive changes remains unclear.
Purpose of the Study:
- To investigate the role of MTM1 in cellular adaptation to nutrient availability.
- To elucidate the mechanism by which MTM1 controls organelle dynamics and metabolism.
Main Methods:
- Studied the effect of MTM1 on endosomal lipid turnover.
- Investigated MTM1's impact on endoplasmic reticulum (ER) morphology and mitochondrial fission.
- Assessed changes in cellular metabolism under starvation conditions.
Main Results:
- MTM1-mediated PI(3)P turnover impairs ER-early endosome contacts during starvation.
- This leads to ER tubule-to-sheet conversion and inhibits mitochondrial fission.
- Cells exhibit sustained oxidative metabolism under starvation.
Conclusions:
- MTM1 is a key regulator of ER shape and mitochondrial function.
- Early endosomal lipid signaling controls cellular adaptation to nutrient stress.
- Findings provide insight into X-linked centronuclear myopathy pathogenesis.
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