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Ischemic Stroke ll: Pathophysiology01:15

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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...
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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.
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Isolation and Flow Cytometric Analysis of Immune Cells from the Ischemic Mouse Brain
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Antigen-specific immune reactions to ischemic stroke.

Xabier Urra1, Francesc Miró2, Angel Chamorro1

  • 1Functional Unit of Cerebrovascular Diseases, Hospital Clínic Barcelona, Spain ; August Pi i Sunyer Biomedical Research Institute (IDIBAPS) Barcelona, Spain.

Frontiers in Cellular Neuroscience
|October 14, 2014
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Summary

Stroke can trigger immune responses to brain proteins, potentially affecting recovery. Understanding these antigen-specific immune events is crucial for stroke patient outcomes.

Keywords:
antigensautoimmunitybrainlymphoid tissuestroketolerance

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Area of Science:

  • Neuroimmunology
  • Stroke research
  • Cerebrovascular disease

Background:

  • Brain proteins in cerebrospinal fluid (CSF) and blood correlate with stroke damage extent.
  • Post-stroke antibody production suggests a humoral immune response to brain injury.
  • Immune tolerance induction shows promise in animal models of cerebral ischemia.

Purpose of the Study:

  • To investigate antigen-specific immune responses following stroke.
  • To explore the mechanisms of immune tolerance to brain antigens in stroke patients.
  • To determine if immune events contribute to neurological complications and impaired stroke recovery.

Main Methods:

  • Detection of brain proteins and antibodies in CSF and blood.
  • Analysis of T cell sensitization and antigen-presenting cells (APCs) in lymphoid tissues.
  • Investigation of brain antigen efflux routes and their impact on immune responses.

Main Results:

  • Circulating T cells sensitized to brain antigens and APCs with brain antigens were found in stroke patients.
  • Brain proteins, inflammatory mediators, and danger signals can access the periphery via multiple routes after stroke.
  • Mechanisms of tolerance to peripherally released brain antigens under inflammatory conditions require further characterization.

Conclusions:

  • Stroke can induce antigen-specific immune responses, involving T cells and APCs.
  • The route of brain antigen access to lymphoid tissue may influence the immune response type.
  • Further research is needed to clarify the role of immune events in stroke-related neurological complications and recovery.