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Related Concept Videos

Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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ATP Synthase: Mechanism01:48

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Adrenal Gland Disorders01:27

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Adrenal gland disorders manifest when the production of adrenal hormones deviates from the norm, resulting in either excessive or insufficient concentrations.
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Mitochondrial Membranes01:45

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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Mitochondria01:37

Mitochondria

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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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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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Related Experiment Video

Updated: Aug 13, 2025

Phosphorus-31 Magnetic Resonance Spectroscopy: A Tool for Measuring In Vivo Mitochondrial Oxidative Phosphorylation Capacity in Human Skeletal Muscle
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Adrenal Dysfunction in Mitochondrial Diseases.

Madeleine Corkery-Hayward1, Louise A Metherell2

  • 1Barts and the London Medical School, Queen Mary University of London, London E1 2AD, UK.

International Journal of Molecular Sciences
|January 21, 2023
PubMed
Summary

Mitochondrial diseases rarely cause adrenal insufficiency. While some cases exist, the incidence is not higher than in the general population, suggesting mitochondrial mutations alone are unlikely to impair cortisol production.

Keywords:
adrenal insufficiencyfamilial glucocorticoid deficiencymitochondriamitochondrial diseases

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Area of Science:

  • Endocrinology
  • Genetics
  • Mitochondrial Biology

Background:

  • Cortisol is vital for stress and immune responses; its deficiency causes severe disorders.
  • Mitochondria are crucial for cortisol synthesis and detoxification, with their dysfunction leading to multi-system diseases.
  • Genetic variants affecting mitochondrial function have been linked to isolated cortisol insufficiency.

Purpose of the Study:

  • To review the association between mitochondrial diseases and adrenal insufficiency.
  • To clarify the role of mitochondrial dysfunction in cortisol production impairment.

Main Methods:

  • Systematic literature review of cases reporting adrenal insufficiency in patients with confirmed mitochondrial diseases.
  • Analysis of prevalence and specific types of mitochondrial disorders associated with adrenal dysfunction.

Main Results:

  • Only 14 cases of adrenal insufficiency in patients with mitochondrial diseases were identified globally.
  • Adrenal dysfunction was most common in mitochondrial deletion syndromes (Pearson, Kearns-Sayre) and with mutations affecting oxidative phosphorylation.
  • The incidence of adrenal insufficiency in mitochondrial disease patients did not exceed general population rates.

Conclusions:

  • Mitochondrial mutations alone are unlikely to be the sole cause of cortisol insufficiency.
  • Further research is needed to understand the pathogenesis of adrenal disease in individuals with mitochondrial disorders.