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Hypoxia

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...

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...

Acute Respiratory Failure-II

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:

Adaptive Mechanisms in Cancer Cells

Adaptive Mechanisms in Cancer Cells

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.
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...

Oxygen Transport in the Blood

Oxygen Transport in the Blood

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,...

Hyperpnea and Hyperventilation

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Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...

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Related Experiment Video

Updated: Jun 15, 2026

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

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

Published on: August 2, 2018

'Desperate house genes': the dramatic example of hypoxia.

J Caradec¹, N Sirab, C Keumeugni

¹INSERM, U955 EQ07, Paris Est University, Créteil, France.

British Journal of Cancer

|February 25, 2010

Summary

Hypoxia significantly alters housekeeping gene (HKG) expression, impacting biological analysis. Selecting appropriate HKGs is crucial for reliable gene expression normalization in cancer research.

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

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Area of Science:

Molecular Biology
Cancer Research
Gene Expression Analysis

Background:

Microenvironmental conditions, such as hypoxia, can affect biological analyses.
Housekeeping genes (HKG) are commonly used for normalizing gene expression data but may fluctuate under different conditions.
Recent studies question the stability of HKGs across various tissues and treatments.

Purpose of the Study:

To investigate the impact of hypoxia on the expression of commonly used HKGs.
To evaluate the variability of HKG expression across different cell lines and oxygen concentrations.
To determine the most stable HKGs for gene expression normalization under hypoxic conditions.

Main Methods:

Measured the expression of 10 HKGs in four cell lines exposed to varying oxygen concentrations (1-20%).
Compared three statistical methods to identify the most stable HKGs.
Assessed the impact of HKG selection on the normalization of a target gene (PAR1).

Main Results:

Observed significant variations in HKG transcripts under hypoxic conditions, varying by cell line and oxygen concentration.
The selection of the most stable HKG depended heavily on the statistical method employed.
Different HKG choices led to divergent conclusions regarding the expression of the PAR1 gene under hypoxia.

Conclusions:

The selection of appropriate HKGs is critical for the accurate interpretation of gene expression data.
HKG variations must be systematically determined for each experimental context to ensure reliable normalization.
Validated HKG selection is essential for robust in vitro experimental design and potential in vivo applications.