Fission and selective fusion govern mitochondrial segregation and elimination by autophagy
Introduction
Results
Mitochondrial fusion is selective
Fusion and fission are paired consecutive events
Membrane potential changes during fusion and fission
Depolarized daughter mitochondrion is unlikely to fuse
Δψm Depolarization occurs hours before autophagy
Reduced OPA1 characterizes non‐fusing and autophagocytosed mitochondria
Inhibition of fission reduces mitochondrial autophagy
Fission‐deficient mitochondria have more oxidized protein but less ROS
FIS1 knockdown affects metabolism and insulin secretion
Discussion
Mitochondrial fusion is selective
OPA1 as a mechanism for selective fusion
Metabolic consequences of single fission events
Is autophagy preventing subsequent fusion of the depolarized daughter unit?
Mitochondrial fission is essential for autophagy
Mitochondrial dynamics and insulin secretion
Materials and methods
Animals
Islet isolation, primary cells and cell line culture
Cell lines
DNA plasmids, constructs
Confocal microscopy
Measurement of ROS production
O2 consumption
Immunostaining
Insulin secretion from INS‐1 cells
Protein oxidation detection
Statistics
Supplementary data
Acknowledgements
Supporting Information
References
Information & Authors
Information
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Cheetah Chase - A female cheetah chases a baby Thomson's Gazelle on the Masai Mara, Kenya, November 2006. The image was taken by Graeme Guy, who leads a Signal Transduction Laboratory at the Institute of Molecular and Cell Biology, an A-Star funded facility in the Biopolis complex in Singapore.
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