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Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

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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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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Multiple sclerosis is a chronic autoimmune disease of the central nervous system (CNS) that affects the brain, spinal cord, and optic nerves. It is an inflammatory demyelinating disorder and a leading cause of neurological disability in young adults.EpidemiologyMS commonly begins between 20 and 40 years of age and is twice as common in women. Its exact cause remains unclear, but genetic susceptibility contributes, with higher risk in first-degree relatives and identical twins. A greater...
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Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...
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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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Immune-mediated CNS damage.

Katrin Kierdorf1, Yiner Wang, Harald Neumann

  • 1Institute of Reconstructive Neurobiology, University Bonn LIFE and BRAIN Center, University Bonn and Hertie-Foundation, Sigmund-Freud-Str. 25, 53127, Bonn, Germany.

Results and Problems in Cell Differentiation
|January 9, 2009
PubMed
Summary
This summary is machine-generated.

Multiple sclerosis involves immune-mediated damage to the nervous system. Understanding how innate and adaptive immunity cause axonal injury and neurodegeneration is key to developing new therapies for multiple sclerosis (MS).

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Area of Science:

  • Neuroimmunology
  • Autoimmune diseases
  • Neurodegeneration

Background:

  • Multiple sclerosis (MS) is a demyelinating autoimmune disease.
  • Neurological deficits in MS stem from axonal injury and neurodegeneration, triggered by immune responses.
  • Innate and adaptive immunity play critical roles in MS pathogenesis.

Purpose of the Study:

  • To elucidate the mechanisms of immune-mediated neuronal damage in multiple sclerosis.
  • To highlight the roles of innate and adaptive immunity in MS-related neurodegeneration and axonal injury.

Main Methods:

  • Review of current literature on the immunological mechanisms in MS.
  • Analysis of the contributions of microglial cells, macrophages, and T cells to neuronal damage.

Main Results:

  • Activated microglia and macrophages (innate immunity) contribute to chronic neurodegeneration via reactive oxygen species and proinflammatory cytokines.
  • Cytotoxic CD8+ T cells (adaptive immunity) mediate acute demyelination and axonal injury by attacking oligodendrocytes and neurons.

Conclusions:

  • Immune-mediated damage is central to MS progression.
  • Targeting specific immune pathways may offer novel therapeutic strategies for MS patients.