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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...

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Related Experiment Video

Updated: Jun 2, 2026

An Improved Method to Isolate Mitochondrial Contact Sites

An Improved Method to Isolate Mitochondrial Contact Sites

Published on: June 16, 2023

Mitochondria unite to survive.

Craig Blackstone, Chuang-Rung Chang

Nature Cell Biology

|May 5, 2011

Summary

Starvation triggers autophagy for nutrients, but paradoxically enlarges mitochondria. This occurs due to PKA inhibiting mitochondrial fission, optimizing ATP production and preventing mitochondrial destruction.

Area of Science:

Cellular biology
Mitochondrial dynamics
Autophagy

Background:

Nutrient deprivation activates autophagy, a cellular recycling process.
Mitochondria paradoxically enlarge during starvation, despite cellular degradation.
Mitochondrial fission and fusion dynamics are crucial for cellular homeostasis.

Discussion:

Starvation inhibits mitochondrial fission via PKA-mediated phosphorylation of DRP1.
Inhibition of fission leads to mitochondrial elongation.
Elongated mitochondria are protected from autophagic degradation.

Key Insights:

PKA signaling pathway regulates mitochondrial morphology during starvation.
DRP1 phosphorylation by PKA is a key mechanism controlling mitochondrial fission.

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Analysis of the Expression and Complexes Assembly of the Mitochondrial Respiratory Chain Proteins in the Fission Yeast Schizosaccharomyces pombe

Analysis of the Expression and Complexes Assembly of the Mitochondrial Respiratory Chain Proteins in the Fission Yeast Schizosaccharomyces pombe

Published on: May 2, 2025

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Published on: June 16, 2023

Isolation and Functional Analysis of Mitochondria from Cultured Cells and Mouse Tissue

Isolation and Functional Analysis of Mitochondria from Cultured Cells and Mouse Tissue

Published on: March 23, 2015

Analysis of the Expression and Complexes Assembly of the Mitochondrial Respiratory Chain Proteins in the Fission Yeast Schizosaccharomyces pombe

Analysis of the Expression and Complexes Assembly of the Mitochondrial Respiratory Chain Proteins in the Fission Yeast Schizosaccharomyces pombe

Published on: May 2, 2025

Mitochondrial elongation serves a dual purpose: enhanced ATP production and survival.

Outlook:

Further investigation into PKA's role in mitochondrial dynamics.
Therapeutic targeting of mitochondrial fission/fusion in metabolic diseases.
Understanding the interplay between autophagy and mitochondrial health.