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Mitochondria

Mitochondria

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,...

Mitochondrial Membranes

Mitochondrial Membranes

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,...

Electron Transport Chain: Complex I and II

Electron Transport Chain: Complex I and II

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.
ROS generation is regulated and maintained at moderate levels necessary...

Regulation of Angiogenesis and Blood Supply

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...

The Inner Mitochondrial Membrane

The Inner Mitochondrial Membrane

The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria. In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...

Mechanism of Angiogenesis

Mechanism of Angiogenesis

Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...

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Related Experiment Video

Updated: Jul 15, 2026

Evaluation of Bioenergetic Function in Cerebral Vascular Endothelial Cells

Evaluation of Bioenergetic Function in Cerebral Vascular Endothelial Cells

Published on: November 19, 2016

Endothelial mitochondria: contributing to vascular function and disease.

Sean M Davidson¹, Michael R Duchen

¹The Hatter Cardiovascular Institute, Department of Medicine, Royal Free and University College Medical School, London, United Kingdom. s.davidson@ucl.ac.uk

Circulation Research

|April 28, 2007

Summary

Endothelial cell mitochondria, often overlooked, play crucial roles in vascular health by regulating calcium, reactive oxygen species, and nitric oxide. They are key targets of oxidative stress and may sense blood oxygen levels, impacting cardiovascular function.

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Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research

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Published on: October 22, 2014

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Last Updated: Jul 15, 2026

Evaluation of Bioenergetic Function in Cerebral Vascular Endothelial Cells

Evaluation of Bioenergetic Function in Cerebral Vascular Endothelial Cells

Published on: November 19, 2016

Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research

Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research

Published on: October 22, 2014

Area of Science:

Cardiovascular Biology
Mitochondrial Function
Endothelial Cell Physiology

Background:

Vascular dysfunction underlies major diseases like atherosclerosis, diabetes, and heart failure.
Oxidative stress and altered lipoprotein levels are key risk factors for these conditions.
Endothelial cells are central to vascular health and disease processes.

Purpose of the Study:

To review the emerging roles of endothelial cell mitochondria in vascular function.
To highlight their involvement in calcium dynamics, reactive oxygen species (ROS) and nitric oxide (NO) production.
To discuss their susceptibility to oxidative stress and potential signaling functions.

Main Methods:

Literature review focusing on endothelial cell mitochondria.
Analysis of studies investigating mitochondrial roles in calcium homeostasis, ROS/NO generation, and apoptosis.
Examination of evidence for mitochondrial sensing of oxygen levels.

Main Results:

Endothelial mitochondria modulate intracellular calcium and generate ROS and NO.
They are critical targets of oxidative stress, influencing cell survival via apoptosis pathways.
Evidence suggests endothelial mitochondria may sense blood oxygen and influence vasodilation.

Conclusions:

Endothelial mitochondria are vital, multifaceted players in vascular health and disease.
Their roles in cellular signaling and response to oxidative stress warrant further investigation.
Understanding these functions could reveal new therapeutic targets for cardiovascular diseases.