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Related Concept Videos

Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is important. 
Pulse Oximetry01:24

Pulse Oximetry

Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...

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Related Experiment Video

Updated: Jun 20, 2026

Quantitative and Temporal Control of Oxygen Microenvironment at the Single Islet Level
11:49

Quantitative and Temporal Control of Oxygen Microenvironment at the Single Islet Level

Published on: November 17, 2013

NOX4 as an oxygen sensor to regulate TASK-1 activity.

Young-Mee Lee1, Byung-Joo Kim, Yang-Sook Chun

  • 1Department of Physiology and Biophysics, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul 110-799, South Korea.

Cellular Signalling
|July 16, 2005
PubMed
Summary
This summary is machine-generated.

Hypoxia inhibits oxygen sensing cells by affecting TASK-1 channels. The study reveals NADPH oxidase (NOX4) acts as a regulatory partner, modulating TASK-1

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Area of Science:

  • Physiology
  • Molecular Biology
  • Cell Biology

Background:

  • Oxygen sensing cells are activated by hypoxia, leading to inhibition of background K+ currents.
  • TASK-1 potassium channels are expressed in oxygen sensing cells and are inactivated by hypoxia, suggesting their role in hypoxic excitation.
  • TASK-1 channels may require a regulatory protein to sense oxygen levels.

Purpose of the Study:

  • To investigate the role of NADPH oxidase NOX4 as an oxygen-sensing partner for TASK-1.
  • To determine if NOX4 modulates the oxygen sensitivity of TASK-1.

Main Methods:

  • Confocal imaging to assess co-localization of TASK-1 and NOX4.
  • Electrophysiological recordings in HEK293 cells to measure TASK-1 activity under hypoxia.
  • Utilizing NOX4 siRNA and NADPH oxidase inhibitors to assess functional effects.

Main Results:

  • TASK-1 and NOX4 were found to co-localize in the plasma membrane.
  • Hypoxia moderately inhibited TASK-1 activity in HEK293 cells, an effect significantly augmented by NOX4.
  • NOX4 knockdown (siRNA) and NADPH oxidase inhibitors abolished the oxygen sensitivity of TASK-1.

Conclusions:

  • NOX4 functions as an oxygen-sensing partner for TASK-1.
  • NOX4 plays a critical role in the oxygen-dependent regulation of TASK-1 activity.
  • This interaction provides a novel mechanism for oxygen sensing in cellular physiology.