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Related Concept Videos

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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Encephalitis l: Introduction01:19

Encephalitis l: Introduction

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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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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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Arboviral Encephalitis01:25

Arboviral Encephalitis

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Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
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Viral Meningitis01:18

Viral Meningitis

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Viral meningitis is the most common form of meningitis and is often referred to as aseptic meningitis to indicate the absence of bacterial involvement. It is generally milder than bacterial meningitis, with symptoms including fever, headache, stiff neck, drowsiness, nausea, photophobia, and vomiting. Rarely, more severe manifestations or death may occur. Common causative agents include enteroviruses, particularly coxsackie A and B viruses and echoviruses, all members of the Enterovirus genus...
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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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Inflammasome induction in Rasmussen's encephalitis: cortical and associated white matter pathogenesis.

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Rasmussen's encephalitis (RE) involves brain inflammation and neurological decline. This study found inflammasome activation in RE brains, suggesting it as a potential therapeutic target for this rare neurological disorder.

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Area of Science:

  • Neuroscience
  • Immunology
  • Pathology

Background:

  • Rasmussen's encephalitis (RE) is a rare inflammatory brain disorder causing progressive neurological deficits.
  • The underlying causes of RE pathogenesis remain largely unknown.
  • This study investigated the role of inflammasome activation in RE.

Purpose of the Study:

  • To investigate the role of inflammasome activation in the pathogenesis of Rasmussen's encephalitis (RE).
  • To correlate inflammasome activity with clinical and neuroimaging findings in RE patients.

Main Methods:

  • Analysis of four RE patients using neuroimaging, neuropsychological, molecular, and pathological assessments.
  • Examination of primary human microglia, astrocytes, and neurons via RT-PCR, ELISA, and western blotting.
  • Assessment of brain tissue for inflammasome components and immune cell infiltration.

Main Results:

  • RE brains showed increased expression of inflammasome-associated genes (e.g., IL-1β, NLRP3, CASP1) and proteins (e.g., MHC class II, IL-1β, caspase-1, ASC).
  • Increased inflammasome components were observed in white matter myeloid cells, correlating with gliosis and mononuclear cell infiltration.
  • Neuroinflammation, inflammasome induction, and neurocognitive deficits were evident in RE patients' white matter and adjacent cortex.

Conclusions:

  • Inflammasome activation is implicated in the pathogenesis of Rasmussen's encephalitis.
  • These findings highlight inflammasome pathways as potential therapeutic targets for RE.
  • Targeting inflammasomes may offer a novel strategy for treating this debilitating neurological condition.