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Oxygen-Glucose Deprivation and Reoxygenation as an In Vitro Ischemia-Reperfusion Injury Model for Studying Blood-Brain Barrier Dysfunction

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Oxygen-dependent lipid peroxidation during lung ischemia.

A B Fisher¹, C Dodia, Z T Tan

¹Institute for Environmental Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104.

The Journal of Clinical Investigation

|August 1, 1991

Summary

Elevated oxygen levels during lung ischemia increase lipid peroxidation, a marker of tissue injury. Inhibiting eicosanoids and reducing blood flow can mitigate this damage, even without reperfusion.

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Area of Science:

Pulmonary Medicine
Biochemistry
Cellular Biology

Background:

Lung ischemia can lead to significant tissue damage.
Lipid peroxidation is a key indicator of oxidative stress and cellular injury.

Purpose of the Study:

To investigate the impact of alveolar oxygen tension on lung lipid peroxidation during ischemia.
To explore the role of eicosanoids and perfusion flow in ischemia-induced lung injury.

Main Methods:

Isolated rat lungs were perfused and subjected to global ischemia.
Ventilation with varying oxygen concentrations (0-95%) was employed.
Lipid peroxidation was measured using thiobarbituric acid-reactive products and conjugated dienes.

Main Results:

Increased lipid peroxidation was observed during ischemia, directly correlating with oxygen concentration.
Ventilation with nitrogen significantly inhibited lipid peroxidation.
Eicosanoid generation contributed substantially to lipid peroxide production.
Reduced perfusion flow prevented lipid peroxidation, and lung fluid accumulation correlated with lipid peroxidation.

Conclusions:

Reperfusion is not essential for lipid peroxidation during lung ischemia.
Elevated partial pressure of oxygen (PO2) during ischemia accelerates lung tissue injury.
Eicosanoids play a significant role in ischemia-induced lung lipid peroxidation.