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Hypoxia01:23

Hypoxia

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Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
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There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
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Acute Respiratory Failure-II01:21

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Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
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Electron Transport Chain: Complex I and II01:46

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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.
ROS generation is regulated and maintained at moderate levels necessary...
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The Electron Transport Chain01:30

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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
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Peroxisomes and Mitochondria01:30

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Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.
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Mitochondria01:37

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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: May 2, 2026

Author Spotlight: Oxygen-Independent Assays to Measure Mitochondrial Function in Mammals
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Author Spotlight: Oxygen-Independent Assays to Measure Mitochondrial Function in Mammals

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Mitochondrial respiratory function induces endogenous hypoxia.

Sara Prior1, Ara Kim1, Toshitada Yoshihara2

  • 1Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America.

Plos One
|March 4, 2014
PubMed
Summary

Mitochondria regulate intracellular hypoxia in cancer cells through oxygen consumption. This finding challenges the traditional view of hypoxia originating solely from external oxygen supply, highlighting a novel mechanism in cancer biology.

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Area of Science:

  • Cell Biology
  • Cancer Research
  • Biochemistry

Background:

  • Hypoxia is crucial in cancer, typically attributed to limited oxygen supply.
  • Cancer cell oxygen consumption's role in inducing hypoxia is understudied.

Purpose of the Study:

  • To investigate the role of mitochondria in inducing intracellular hypoxia.
  • To explore the regulation of intracellular oxygen levels by cancer cell metabolism.

Main Methods:

  • Utilized Acetylacetonatobis [2-(2'-benzothienyl) pyridinato-kN, kC3'] iridium (III) (BTP), an oxygen sensor, for microscopy-based detection of intracellular hypoxia.
  • Examined oxygen consumption in well-differentiated (LNCaP, MCF-7) and poorly-differentiated (PC-3, MDAMB231) cancer cell lines.
  • Assessed the impact of mitochondrial complex I inhibition (rotenone) and mitochondrial DNA (mtDNA) reduction on intracellular hypoxia.
  • Investigated the influence of glucose concentration, fetal calf serum (FCS), androgen analogs, and anti-androgens on hypoxic status.

Main Results:

  • Well-differentiated cancer cells (LNCaP, MCF-7) exhibited intracellular hypoxia due to high oxygen consumption, unlike poorly-differentiated cells (PC-3, MDAMB231).
  • Mitochondrial activity, specifically complex I function and mtDNA content, directly regulated intracellular hypoxia.
  • Hypoxia-inducible factor 1-alpha (HIF-1α) activation in LNCaP cells was dependent on mitochondrial respiration.
  • Glucose concentration influenced intracellular hypoxia via a parabolic dose response, with low glucose inducing the strongest hypoxia (Crabtree effect).
  • FCS and androgen analogs (R1881) induced hypoxia in LNCaP cells, while flutamide inhibited this effect.

Conclusions:

  • Mitochondrial respiratory function is a key determinant of intracellular hypoxic status in cancer cells.
  • This mitochondrial regulation of oxygen levels impacts oxygen-dependent biological functions within cancer cells.
  • Findings suggest a novel mechanism for hypoxia induction within tumors, driven by cellular metabolism.