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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...
Cellular Injury I: Introduction01:00

Cellular Injury I: Introduction

Cellular injury occurs when a cell cannot maintain homeostasis or adapt to stressors such as hypoxia, toxins, or trauma. Depending on severity and duration, injury may be reversible, allowing recovery, or irreversible, leading to cell death.General Mechanisms of Cell InjuryAlthough causes vary, most cellular injuries arise from a few key mechanisms that disrupt essential functions and often amplify one another. Cell survival depends on the extent and balance of these disturbances.ATP depletion...

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Related Experiment Video

Updated: Jun 3, 2026

Hypoxia Alters miRNAs Levels Involved in Non-Mendelian Inheritance of Autism Spectrum Disorder in Mice
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Hypoxia Alters miRNAs Levels Involved in Non-Mendelian Inheritance of Autism Spectrum Disorder in Mice

Published on: July 11, 2025

Cellular changes underlying hyperoxia-induced delay of white matter development.

Thomas Schmitz1, Jonathan Ritter, Susanne Mueller

  • 1Center for Neuroscience Research, Children's National Medical Center, Washington, DC 20010, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 18, 2011
PubMed
Summary

Hyperoxia exposure in neonatal mice causes periventricular white matter injury (PWMI) by disrupting oligodendrocyte development and glutamate homeostasis, leading to long-term white matter deficits despite cellular recovery.

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Isolation of Pulmonary Artery Smooth Muscle Cells from Neonatal Mice
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Published on: October 19, 2013

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Neonatal Research

Background:

  • Periventricular white matter injury (PWMI) impairs neurological development in premature infants, often linked to myelination abnormalities.
  • Neonatal hyperoxia exposure has been shown to disrupt myelin formation, suggesting a potential cause for PWMI.

Purpose of the Study:

  • To investigate the cellular mechanisms underlying hyperoxia-induced PWMI in neonatal mice.
  • To characterize the effects of hyperoxia on oligodendrocyte development and glutamate homeostasis in the white matter.

Main Methods:

  • Utilized transgenic mice (EGFP and GFAP-EGFP) exposed to hyperoxia (80% oxygen) from postnatal day 6 to 8.
  • Assessed myelin basic protein expression, oligodendroglia (CC1+), progenitor cells (NG2+), and astrocyte markers (GFAP).
  • Evaluated cell proliferation, apoptosis, glutamate uptake, and astrocyte-conditioned medium effects on oligodendrocyte progenitor cells.

Main Results:

  • Hyperoxia decreased myelin basic protein and oligodendroglia at P8, with recovery by P15, but revealed persistent white matter deficiencies at P30 and P60 via diffusion tensor imaging.
  • Hyperoxia induced apoptosis and reduced proliferation of oligodendrocyte progenitor cells, followed by recovery of cell population and oligodendrogenesis.
  • Astrocytes showed altered GFAP and glutamate-aspartate transporter expression, with reduced glutamate uptake and impaired protection of oligodendrocyte progenitor cells against glutamate toxicity.

Conclusions:

  • Hyperoxia-induced PWMI involves disruption of oligodendrocyte development and impaired glutamate homeostasis.
  • Astrocytes play a critical role in mediating hyperoxia-induced white matter damage through altered glutamate regulation.
  • Understanding these mechanisms is crucial for developing targeted therapies for hyperoxia-induced neurological deficits in premature infants.