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Open AccessJournal ArticleDOI

Drp1-dependent mitochondrial fission via MiD49/51 is essential for apoptotic cristae remodeling

TLDR
Drp1-dependent mitochondrial fission through MiD49 and MiD51, but not through Mff, is essential for cristae remodeling to facilitate cytochrome c release during the early phase of intrinsic apoptosis.
Abstract
Mitochondrial fission facilitates cytochrome c release from the intracristae space into the cytoplasm during intrinsic apoptosis, although how the mitochondrial fission factor Drp1 and its mitochondrial receptors Mff, MiD49, and MiD51 are involved in this reaction remains elusive. Here, we analyzed the functional division of these receptors with their knockout (KO) cell lines. In marked contrast to Mff-KO cells, MiD49/MiD51-KO and Drp1-KO cells completely resisted cristae remodeling and cytochrome c release during apoptosis. This phenotype in MiD49/51-KO cells, but not Drp1-KO cells, was completely abolished by treatments disrupting cristae structure such as OPA1 depletion. Unexpectedly, OPA1 oligomers generally thought to resist cytochrome c release by stabilizing the cristae structure were similarly disassembled in Drp1-KO and MiD49/51-KO cells, indicating that disassembly of OPA1 oligomers is not directly linked to cristae remodeling for cytochrome c release. Together, these results indicate that Drp1-dependent mitochondrial fission through MiD49/MiD51 regulates cristae remodeling during intrinsic apoptosis.

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Molecular mechanisms of cell death: recommendations of the Nomenclature Committee on Cell Death 2018.

Lorenzo Galluzzi, +186 more
TL;DR: The Nomenclature Committee on Cell Death (NCCD) has formulated guidelines for the definition and interpretation of cell death from morphological, biochemical, and functional perspectives.
Journal ArticleDOI

Mitochondria as multifaceted regulators of cell death.

TL;DR: Surprisingly, recent data demonstrate that besides eliciting caspase activation, MOMP engages various pro-inflammatory signalling functions, suggesting that mitochondria-derived signalling downstream of pro-apoptotic cues may also have non-lethal functions.
Journal ArticleDOI

Mitochondrial dynamics: overview of molecular mechanisms

TL;DR: An overview of the molecular mechanisms that govern mitochondrial fission and fusion in mammals is described and several members of the machinery can undergo post-translational modifications modulating these processes.
Journal ArticleDOI

The cell biology of mitochondrial membrane dynamics

TL;DR: How bioenergetics and cellular signalling are linked to dynamic changes of mitochondrial morphology is described, with morphological changes to mitochondria accompanying a multitude of processes as diverse as cell pluripotency, division, differentiation, senescence and death.
References
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Journal ArticleDOI

Mitochondria and cell death: outer membrane permeabilization and beyond

TL;DR: MOMP typically leads to cell death irrespective of caspase activity by causing a progressive decline in mitochondrial function, although cells can survive this under certain circumstances, which may have pathophysiological consequences.
Journal ArticleDOI

The role of dynamin-related protein 1, a mediator of mitochondrial fission, in apoptosis.

TL;DR: In healthy cells, fusion and fission events participate in regulating mitochondrial morphology and inhibition of Drp1 blocks cell death, implicating mitochondrial fission as an important step in apoptosis.
Journal ArticleDOI

ER Tubules Mark Sites of Mitochondrial Division

TL;DR: It was found that mitochondrial division occurred at positions where ER tubules contacted mitochondria and mediated constriction before Drp1 recruitment, suggesting that ERtubules may play an active role in defining the position of mitochondrial division sites.
Journal ArticleDOI

Cyclophilin D-dependent mitochondrial permeability transition regulates some necrotic but not apoptotic cell death

TL;DR: The results indicate that the CypD-dependent mPT regulates some forms of necrotic death, but not apoptotic death, as indicated by resistance to ischaemia/reperfusion-induced cardiac injury.
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