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Related Concept Videos

Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure01:16

Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure

Oxygen therapy has emerged as a significant tool in enhancing the quality of life for patients suffering from pulmonary arterial hypertension (PAH). While this therapy has principally been studied on patients with significant hypoxemia, this therapeutic approach helps prevent potential organ damage and can be administered in the comfort of one's home.
Oxygen therapy is vital in increasing and maintaining blood oxygen levels in PAH patients. As a result, it aids in reducing fatigue, improving...
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...
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...

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Related Experiment Video

Updated: Jul 20, 2026

A Hypoxia-Reoxygenation Injury Model in Self-Assembling Human Cardioids
10:41

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Published on: March 17, 2026

Re-oxygenation improves hypoxia-induced pulp cell arrest.

Y Ueno1, C Kitamura, M Terashita

  • 1Division of Pulp Biology, Operative Dentistry, and Endodontics, Department of Cariology and Periodontology, Science of Oral Functions, Kyushu Dental College, 2-6-1 Manazuru, Kokurakita, Kitakyushu 803-8580, Japan.

Journal of Dental Research
|August 26, 2006
PubMed
Summary

Hypoxia suppresses dental pulp cell growth and survival, causing cell cycle arrest. However, this arrest is reversible upon re-oxygenation, with cyclin D2 playing a key role in recovery.

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Published on: January 7, 2019

Area of Science:

  • Cell Biology
  • Dental Research
  • Hypoxia Studies

Background:

  • Dental pulp cells face hypoxia during inflammation and dental procedures.
  • The cellular response to hypoxia in dental pulp is not fully understood.
  • Investigating hypoxia's impact on pulp cell behavior is crucial for regenerative dentistry.

Purpose of the Study:

  • To investigate the effects of hypoxia on dental pulp cell growth and cell cycle regulation.
  • To identify molecular mechanisms underlying hypoxia-induced changes in pulp cells.
  • To determine if hypoxia-induced effects on pulp cells are reversible.

Main Methods:

  • In vitro culture of dental pulp cells.
  • Exposure to hypoxic conditions (48 hours).
  • Cell viability assays (Hoechst staining), Western blot analysis for protein phosphorylation (retinoblastoma protein), cyclin D2, and p21(CIP1/WAF1) expression.
  • Re-oxygenation experiments.

Main Results:

  • Hypoxia significantly suppressed dental pulp cell growth and induced cell death.
  • Hypoxia inhibited retinoblastoma protein phosphorylation, suppressed cyclin D2, and activated p21(CIP1/WAF1).
  • Re-oxygenation reversed hypoxia-induced cell cycle arrest, improving cell viability and cyclin D2 expression.

Conclusions:

  • Hypoxia induces a reversible cell cycle arrest in dental pulp cells.
  • Cyclin D2 is essential for the recovery of cell proliferation following re-oxygenation.
  • These findings offer insights into pulp cell responses to ischemic conditions.