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Related Concept Videos

Physiological Control of Respiration01:23

Physiological Control of Respiration

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Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
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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%.
Types of Hypoxia
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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Chemical Factors Affecting Respiration Centers01:31

Chemical Factors Affecting Respiration Centers

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Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
CO2 has a potent influence on respiration and is strictly regulated....
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Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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Membrane Fluidity01:23

Membrane Fluidity

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Regulation of Metabolism01:19

Regulation of Metabolism

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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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Related Experiment Video

Updated: Sep 23, 2025

Author Spotlight: Extended Oxygen Consumption Measurement in Retinal Pigment Epithelium Using Resipher
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Author Spotlight: Extended Oxygen Consumption Measurement in Retinal Pigment Epithelium Using Resipher

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Modulating Nucleus Oxygen Concentration by Altering Intramembrane Cholesterol Levels: Creating Hypoxic Nucleus in

Joao Seco1,2, Clarence C King3, Gianmarco Camazzola1

  • 1Division of Biomedical Physics in Radiation Oncology, DKFZ German Cancer Research Center, 69120 Heidelberg, Germany.

International Journal of Molecular Sciences
|May 14, 2022
PubMed
Summary
This summary is machine-generated.

Cancer cells can lower nuclear oxygen levels by controlling membrane cholesterol, enhancing resistance to therapy. This occurs independently of external hypoxia, impacting cell cycle progression and treatment outcomes.

Keywords:
HIFOERWarburg Effectcholesterolhypoxianucleus oxygen concentration

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Oncology

Background:

  • Cancer cells can develop resistance to chemotherapy and radiotherapy.
  • Hypoxia, or low oxygen conditions, is known to promote cancer cell survival and treatment resistance.
  • The role of intracellular oxygen levels, independent of external hypoxia, in cancer progression is less understood.

Purpose of the Study:

  • To propose and investigate a novel mechanism by which cancer cells can modulate nuclear oxygen concentration.
  • To explore the role of cellular membrane cholesterol in regulating intracellular oxygen diffusion.
  • To determine if altered nuclear oxygen levels contribute to chemo- and radio-resistance during the cell cycle.

Main Methods:

  • Experimental evaluation of cellular and nuclear oxygen content in bladder (T24) cancer cells.
  • Synchronization of cells at the late G1-phase/early S-phase using hydroxyurea (HU).
  • Analysis using RT-qPCR for hypoxia-inducible factors (HIF) and prolyl hydroxylases (PHD) and radiation clonogenic assays.

Main Results:

  • Cancer cells can create low nuclear oxygen conditions by modulating membrane cholesterol, which slows oxygen diffusion.
  • This mechanism allows for the creation of low nuclear oxygen independent of an external hypoxic microenvironment.
  • Cells exhibit increased radiation resistance (2- to 3-fold) during the late S-phase/early G2-phase due to reduced nuclear oxygen.

Conclusions:

  • Cholesterol-mediated regulation of membrane rigidity impacts intracellular oxygen diffusion and nuclear oxygen levels.
  • Reduced nuclear oxygen during specific cell cycle phases enhances cancer cell resistance to radiation therapy.
  • This finding offers potential new therapeutic strategies targeting intracellular oxygen homeostasis in cancer treatment.