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Related Concept Videos

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...
Cytotoxic Edema: Pathophysiology01:21

Cytotoxic Edema: Pathophysiology

Cytotoxic edema is a form of cerebral edema characterized by intracellular swelling of neurons, astrocytes, and other glial cells. It develops when the mechanisms responsible for maintaining ionic gradients across the cell membrane become impaired. Under normal physiological conditions, the sodium–potassium ATPase actively transports sodium ions out of the cell and potassium ions into the cell, preserving osmotic balance and enabling electrical signaling. This pump requires a continuous supply...
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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%.
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Related Experiment Video

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A Novel In Vitro Model of Blast Traumatic Brain Injury
08:59

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Published on: December 21, 2018

Hyperoxic exposure leads to cell death in the developing brain.

Uluç Yiş1, Semra Hiz Kurul, Abdullah Kumral

  • 1Department of Pediatric Neurology, School of Medicine, Dokuz Eylül University, Inciralti, 35340 Izmir, Turkey. ulyis@yahoo.com

Brain & Development
|March 11, 2008
PubMed
Summary
This summary is machine-generated.

High oxygen levels, or hyperoxia, harm the developing brains of premature infants, leading to reduced neuronal density and increased cell death. This brain injury may explain later motor and cognitive impairments in these vulnerable infants.

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Area of Science:

  • Neuroscience
  • Neonatal Research
  • Developmental Biology

Background:

  • Premature infants often experience motor and cognitive impairments.
  • Neonatal intensive care units routinely use high oxygen concentrations (hyperoxia).
  • Hyperoxia is known to injure infant lungs and retinas, but its effects on the developing brain are less understood.

Purpose of the Study:

  • To investigate the impact of hyperoxia on the developing rat brain.
  • To determine if high oxygen exposure causes neuronal loss or cell death in specific brain regions.

Main Methods:

  • Wistar rat pups were exposed to either 21% (control) or 80% (hyperoxia) oxygen from birth to day 5.
  • Immunohistochemistry and ELISA cell death assays were used to assess neuronal density and apoptosis.
  • Specific brain regions examined included the hippocampus (CA1 and dentate gyrus), prefrontal cortex, parietal cortex, subiculum, and retrosplenial cortex.

Main Results:

  • Exposure to 80% oxygen significantly decreased neuronal density across all investigated brain areas.
  • ELISA cell death and TUNEL assays revealed a significant increase in cell death in the brains of hyperoxia-exposed rat pups.
  • Hyperoxia demonstrably induces cell death in the developing brain tissue.

Conclusions:

  • Hyperoxia is a significant factor contributing to cell death in the developing brain.
  • This hyperoxia-induced brain damage may be a key mechanism underlying motor and cognitive deficits observed in premature infants later in life.