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Related Concept Videos

Secondary Spinal Cord Injury llI: Pathophysiology01:25

Secondary Spinal Cord Injury llI: Pathophysiology

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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...
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Acute Inflammation II: Local and Systemic Effects01:25

Acute Inflammation II: Local and Systemic Effects

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Acute inflammation produces a coordinated set of local and systemic changes that limit injury, eliminate pathogens, and initiate repair. These responses arise within minutes of infection, trauma, or chemical insult and are driven by vascular alterations and leukocyte-derived mediators. When the stimulus resolves, the reaction typically abates within days.Local EffectsAt the site of injury, arteriolar vasodilation increases blood flow, resulting in redness and warmth. Simultaneously, increased...
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Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

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Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
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Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

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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...
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Inflammatory Response I: Vascular and Cellular01:30

Inflammatory Response I: Vascular and Cellular

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The inflammatory response is the body's defense against infection, injury, or irritation from bacteria, trauma, toxins, or heat. Inflammation helps locate and destroy pathogens and remove damaged tissue elements to heal the body. During this initial phase, fluid, blood products, and nutrients migrate to the injured area, resulting in redness, heat, swelling, ache, and loss of function. Moreover, signs of systemic inflammation include fever, increased WBC count, malaise, anorexia, nausea,...
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Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

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Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
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Related Experiment Video

Updated: Apr 27, 2026

Author Spotlight: Developing Precise and Clinically Relevant Models for Studying Secondary Degeneration in Traumatic Optic Neuropathy
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The systemic response to CNS injury.

Daniel C Anthony1, Yvonne Couch1

  • 1Department of Pharmacology, University of Oxford, Oxford, UK.

Experimental Neurology
|July 15, 2014
PubMed
Summary

Central nervous system (CNS) injury triggers distinct inflammatory responses in the spinal cord versus the brain. Peripheral organs significantly influence CNS inflammation outcomes, impacting recovery and secondary damage.

Area of Science:

  • Neuroimmunology
  • Central Nervous System (CNS) Injury
  • Inflammation

Background:

  • Inflammation in the brain or spinal cord can cause neuronal damage and long-term disability in CNS pathologies.
  • Spinal cord injuries induce greater leukocyte recruitment and inflammation compared to brain injuries.
  • CNS injury impacts gene expression and cellularity in distant organs like the liver, lung, and spleen, potentially causing secondary damage.

Purpose of the Study:

  • To investigate the differential inflammatory responses in the spinal cord versus the brain following CNS injury.
  • To explore the role of peripheral organs (liver, lung, spleen) in modulating CNS inflammation and injury outcomes.
  • To understand how the peripheral immune system coordinates responses to CNS injury and the impact of concurrent infections or injuries.

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Systems Analysis of the Neuroinflammatory and Hemodynamic Response to Traumatic Brain Injury
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Main Methods:

  • Comparative analysis of inflammatory markers and leukocyte infiltration in the spinal cord and brain post-injury.
  • Assessment of gene expression and cellular changes in peripheral organs following CNS injury.
  • Evaluation of the influence of peripheral immune system activation on CNS inflammation and neurological outcomes.

Main Results:

  • Significant differences observed in leukocyte recruitment and inflammatory mediator levels between spinal cord and brain injuries.
  • CNS injury induces substantial alterations in peripheral organ physiology, contributing to systemic inflammation.
  • The timing and nature of peripheral immune system challenges dictate pro- or anti-inflammatory effects on CNS injury outcomes.

Conclusions:

  • The spinal cord exhibits a more pronounced inflammatory response to injury than the brain, influenced by systemic factors.
  • Peripheral organ responses are critical in determining the overall inflammatory milieu and recovery trajectory after CNS injury.
  • Understanding the interplay between central and peripheral inflammation is crucial for developing effective therapeutic strategies for CNS pathologies.