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Related Concept Videos

Ischemic Stroke ll: Pathophysiology01:15

Ischemic Stroke ll: Pathophysiology

An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
Neurogenesis and Regeneration of Nervous Tissue01:15

Neurogenesis and Regeneration of Nervous Tissue

In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
Secondary Spinal Cord Injury llI: Pathophysiology01:25

Secondary Spinal Cord Injury llI: Pathophysiology

Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...
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...
Ischemic Stroke l: Introduction01:15

Ischemic Stroke l: Introduction

Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.
Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...

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Related Experiment Video

Updated: Jun 27, 2026

A Cell Culture Model for Studying the Role of Neuron-Glia Interactions in Ischemia
11:36

A Cell Culture Model for Studying the Role of Neuron-Glia Interactions in Ischemia

Published on: November 14, 2020

Astrocytes and ischemic injury.

Takahiro Takano1, Nancyann Oberheim, Maria Luisa Cotrina

  • 1Divison of Glial Disease and Therapeutics, Center for Translational Neuromedicine, Department of Neurosurgery, University of Rochester Medical Center, 601 Elmwood Avenue, Rochester, NY 14642, USA.

Stroke
|December 10, 2008
PubMed
Summary

Astrocytes, not neurons, are central to ischemic stroke injury. Supporting astrocyte function, rather than targeting neurons directly, may be a more effective neuroprotection strategy for stroke.

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Monitoring Astrocyte Reactivity and Proliferation in Vitro Under Ischemic-Like Conditions
15:08

Monitoring Astrocyte Reactivity and Proliferation in Vitro Under Ischemic-Like Conditions

Published on: October 21, 2017

Related Experiment Videos

Last Updated: Jun 27, 2026

A Cell Culture Model for Studying the Role of Neuron-Glia Interactions in Ischemia
11:36

A Cell Culture Model for Studying the Role of Neuron-Glia Interactions in Ischemia

Published on: November 14, 2020

Monitoring Astrocyte Reactivity and Proliferation in Vitro Under Ischemic-Like Conditions
15:08

Monitoring Astrocyte Reactivity and Proliferation in Vitro Under Ischemic-Like Conditions

Published on: October 21, 2017

Area of Science:

  • Neuroscience
  • Cell Biology
  • Pathology

Background:

  • Ischemic injury traditionally focuses on neuronal loss.
  • However, ischemic infarcts affect all brain cells, including astrocytes.
  • The role of astrocytes in ischemic neuronal death is increasingly recognized.

Purpose of the Study:

  • To review the fundamental role of astrocytes in ischemic neuronal death.
  • To propose a "gliocentric view" of stroke pathogenesis.
  • To evaluate the potential of astrocyte-targeted therapies for neuroprotection.

Main Methods:

  • Literature review of existing research on ischemic injury and astrocyte function.
  • Analysis of the metabolic support provided by astrocytes to neurons.
  • Theoretical framework development for a gliocentric perspective on stroke.

Main Results:

  • Astrocytes are crucial for maintaining neuronal metabolic needs.
  • Failure of astrocyte support is a primary driver of ischemic neuronal death.
  • Current neuroprotective strategies targeting neurons may be less effective.

Conclusions:

  • A gliocentric view reframes stroke pathogenesis.
  • Targeting astrocyte functional integrity offers a promising avenue for neuroprotection.
  • Future research should focus on enhancing astrocyte support to improve stroke outcomes.