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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...

Ion Channels

Ion Channels

The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow specific...

The Role of Ion Channels in Neuronal Computation

The Role of Ion Channels in Neuronal Computation

A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.

Non-gated Ion Channels

Non-gated Ion Channels

Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.

Non-gated Ion Channels

Non-gated Ion Channels

Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.

Voltage-gated Ion Channels

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...

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Related Experiment Video

Updated: Jun 5, 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

Hypoxia. 4. Hypoxia and ion channel function.

Larissa A Shimoda¹, Jan Polak

¹Div. of Pulmonary and Critical Care Medicine, Johns Hopkins University, 5501 Hopkins Bayview Circle, Baltimore, MD 21224, USA. shimodal@welch.jhu.edu

American Journal of Physiology. Cell Physiology

|December 24, 2010

Summary

This summary is machine-generated.

Understanding how cells respond to low oxygen (hypoxia) is vital for survival. This review details how hypoxia affects various ion channels in mammals, impacting cell function and viability.

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Area of Science:

Physiology
Molecular Biology
Cell Biology

Background:

Cellular oxygen sensing is crucial for survival.
Ion channels regulate vital physiological processes like neuronal transmission and cardiac function.
Hypoxia (low oxygen) significantly impacts cell viability and function.

Purpose of the Study:

To review the effects of acute and sustained hypoxia on mammalian ion channels.
To elucidate the mechanisms of action of hypoxia on ion channels.
To highlight the role of these channels in various cellular processes.

Main Methods:

Literature review of studies on oxygen-sensitive ion channels.
Analysis of research on hypoxia's impact on ion channels across different cell types and tissues.
Synthesis of information on the functional consequences of altered ion channel activity during hypoxia.

Main Results:

Hypoxia affects a diverse range of mammalian ion channels.
Both acute and sustained (continuous and intermittent) hypoxia alter ion channel function.
These changes in ion channel activity contribute to cellular responses to oxygen deprivation.

Conclusions:

Ion channels are key mediators of cellular responses to hypoxia.
Understanding these oxygen-sensitive channels is critical for comprehending cell viability and function.
Further research into hypoxia-ion channel interactions may reveal therapeutic targets.