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Related Concept Videos

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:
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Regulation of Angiogenesis and Blood Supply01:24

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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...
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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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The Electron Transport Chain01:30

The Electron Transport Chain

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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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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.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
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Adaptive Mechanisms in Cancer Cells02:53

Adaptive Mechanisms in Cancer Cells

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Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
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Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions
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Cycling hypoxia selects for constitutive HIF stabilization.

Mariyah Pressley1,2, Jill A Gallaher1, Joel S Brown1

  • 1Department of Integrated Mathematical Oncology, Moffitt Cancer Center and Research Institute, SRB4, 12902 Magnolia Drive, Tampa, FL, 33612, USA.

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Facultative hypoxia-inducible factor alpha (HIF-α) regulation enhances cell proliferation under fluctuating oxygen. Constitutive HIF-α may offer an advantage in specific cancer conditions like pseudohypoxia.

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Area of Science:

  • Oncology
  • Mathematical Biology
  • Cellular Physiology

Background:

  • Tumors exhibit dynamic oxygenation changes, influencing cellular responses.
  • Hypoxia-inducible factors (HIF-α) are key regulators of oxygen homeostasis, typically stabilized by hypoxia.
  • Cancer cells can exhibit constitutive HIF-α stabilization even under normal oxygen levels (normoxia).

Purpose of the Study:

  • To model the impact of fluctuating oxygenation on HIF-α stabilization and net cell proliferation.
  • To compare the effectiveness of facultative versus constitutive HIF-α regulation strategies.
  • To investigate the selective pressures favoring constitutive HIF-α in cancer, such as pseudohypoxia.

Main Methods:

  • Development of a mathematical model to simulate HIF-α dynamics and cell proliferation.
  • Analysis of cell proliferation rates under varying oxygenation profiles (stochastic, slow, and rapid periodic).
  • Comparison of facultative and constitutive HIF-α regulation strategies in silico.

Main Results:

  • Facultative HIF-α regulation generally yields higher net cell proliferation than constitutive regulation under stochastic or slow oxygen fluctuations.
  • Cell fitness is comparable between facultative and constitutive HIF-α strategies during rapid periodic oxygenation.
  • Constitutive HIF-α expression may provide a selective advantage when expression costs are low, as seen in cancer's pseudohypoxia.

Conclusions:

  • Fluctuating oxygenation dynamics significantly influence the optimal strategy for HIF-α regulation.
  • Rapid, regular oxygen cycling favors constitutive HIF-α stabilization, consistent with pseudohypoxia and the Warburg Effect in cancer.
  • Ecological theory, specifically optimal defense, aligns with the selection of pseudohypoxia under specific oxygenation conditions.