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Related Concept Videos

Hypoxia01:23

Hypoxia

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...
Oxygen Requirements and Growth Patterns01:29

Oxygen Requirements and Growth Patterns

Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...
Physiological Control of Respiration01:23

Physiological Control of Respiration

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...
Chemical Factors Affecting Respiration Centers01:31

Chemical Factors Affecting Respiration Centers

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. Under...
Respiratory Assessment: Purpose and Indications01:19

Respiratory Assessment: Purpose and Indications

Respiratory assessment is a cornerstone of nursing assessments, crucial for the early detection of patient deterioration. This evaluation transcends routine procedures, representing a critical skill nurses must master to ensure optimal patient care.
Objectives and Importance:
The primary goal of respiratory assessment is to evaluate patients at early risk of clinical deterioration. Since respiratory distress often precedes other signs of declining health, breathing patterns and sounds become a...
Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

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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Related Experiment Video

Updated: Jul 13, 2026

Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions
09:17

Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions

Published on: August 2, 2018

Oxygen sensing and hypoxia-induced responses.

Mathew L Coleman1, Peter J Ratcliffe

  • 1Henry Wellcome Building for Molecular Physiology, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, U.K.

Essays in Biochemistry
|August 21, 2007
PubMed
Summary

Cellular hypoxia threatens tissues, but organisms use a conserved pathway involving oxygen-sensing enzymes and hypoxia-inducible factors (HIF) to adapt. This review explores HIF signaling and potential new oxygen-sensing pathways.

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Induction and Testing of Hypoxia in Cell Culture
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Tracking Hypoxic Signaling within Encapsulated Cell Aggregates

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Last Updated: Jul 13, 2026

Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions
09:17

Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions

Published on: August 2, 2018

Induction and Testing of Hypoxia in Cell Culture
07:01

Induction and Testing of Hypoxia in Cell Culture

Published on: August 12, 2011

Tracking Hypoxic Signaling within Encapsulated Cell Aggregates
09:14

Tracking Hypoxic Signaling within Encapsulated Cell Aggregates

Published on: December 16, 2011

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Physiology

Background:

  • Low cellular oxygen (hypoxia) poses a significant threat to tissue viability.
  • Multicellular organisms possess a conserved signaling pathway for physiological oxygen homeostasis.
  • This pathway involves oxygen-sensing enzymes regulating the hypoxia-inducible factor (HIF) transcription factor.

Purpose of the Study:

  • To summarize the canonical HIF hydroxylase signaling pathway.
  • To explore the potential for other oxygen-sensing enzymes.
  • To speculate on the role of these enzymes in alternative hypoxia signaling pathways.

Main Methods:

  • Review of existing literature on hypoxia signaling.
  • Analysis of the role of HIF hydroxylases in oxygen homeostasis.
  • Discussion of identified protein hydroxylations and their responsible enzymes.

Main Results:

  • The canonical hypoxia signaling pathway, mediated by HIF hydroxylases, is crucial for adapting to low oxygen.
  • HIF hydroxylases have been observed in contexts beyond canonical hypoxia signaling, suggesting broader substrate roles.
  • Several intracellular proteins are hydroxylated, but the responsible enzymes remain largely unidentified.

Conclusions:

  • The canonical HIF pathway is well-established for hypoxia adaptation.
  • Evidence suggests the existence of additional oxygen-sensing enzymes.
  • These novel enzymes may mediate hypoxia signaling through alternative pathways.