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Related Concept Videos

Cellular Injury I: Introduction01:00

Cellular Injury I: Introduction

Cellular injury occurs when a cell cannot maintain homeostasis or adapt to stressors such as hypoxia, toxins, or trauma. Depending on severity and duration, injury may be reversible, allowing recovery, or irreversible, leading to cell death.General Mechanisms of Cell InjuryAlthough causes vary, most cellular injuries arise from a few key mechanisms that disrupt essential functions and often amplify one another. Cell survival depends on the extent and balance of these disturbances.ATP depletion...
Cellular Injury II: Classification01:21

Cellular Injury II: Classification

Cellular injury is any process that disrupts a cell’s ability to maintain homeostasis, leading to structural or functional changes. It is broadly classified based on etiology (cause) and mechanism of damage.Classification by EtiologyCellular injury may result from several causes. Hypoxic injury happens due to reduced oxygen delivery, most commonly from inadequate blood supply, such as arterial obstruction; for example, coronary artery thrombosis can cause myocardial infarction. Chemical injury...
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

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...
Traumatic Brain Injury l: Introduction01:28

Traumatic Brain Injury l: Introduction

DefinitionTraumatic brain injury, or TBI, is a disturbance of normal brain function induced by an external mechanical force, such as a direct blow to the head or a penetrating injury. It can affect both brain structure and function, producing a wide range of clinical outcomes. TBI is a heterogeneous condition, meaning its effects may differ based on the type, location, and severity of the injury.Basis of ClassificationTBI is classified based on severity, injury mechanism, or pathophysiology. In...
Increased Intracranial Pressure ll: Pathophysiology01:29

Increased Intracranial Pressure ll: Pathophysiology

Increased intracranial pressure (ICP) refers to a potentially life-threatening rise in pressure inside the skull. This usually happens when there is a major change in the volume of brain tissue, blood, or cerebrospinal fluid (CSF) — the three components inside the skull. According to the Monro-Kellie doctrine, if the volume of one component increases, the volumes of the other components must decrease to maintain normal pressure. If this does not happen, ICP rises.The process often begins with...
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 30, 2026

Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury
10:33

Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury

Published on: August 14, 2019

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Cellular infiltration in traumatic brain injury.

Aftab Alam1, Eric P Thelin2,3,4, Tamara Tajsic2

  • 1Division of Neurosurgery, Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK. alam.camb@gmail.com.

Journal of Neuroinflammation
|November 4, 2020
PubMed
Summary

Traumatic brain injury triggers a cascade of cellular damage and immune responses, involving neutrophils, microglia, and astrocytes. These cells work to clear debris, contain injury, and initiate repair processes in the central nervous system.

Keywords:
Cellular infiltrationMicroglial dynamicsNeuroinflammationTraumatic brain injury

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Systems Analysis of the Neuroinflammatory and Hemodynamic Response to Traumatic Brain Injury
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Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Traumatic brain injury (TBI) causes cellular damage, releasing damage-associated molecular patterns (DAMPs).
  • DAMPs initiate inflammatory responses involving cytokines and chemokines, recruiting immune cells to the injury site.
  • Resident glial cells, including microglia and astrocytes, play crucial roles in the early and later stages of TBI response.

Purpose of the Study:

  • To elucidate the sequential cellular and molecular events following traumatic brain injury.
  • To understand the roles of various immune cells and glial cells in the brain's response to TBI.
  • To identify mechanisms contributing to both injury progression and repair after TBI.

Main Methods:

  • Observational study detailing cellular responses post-TBI.
  • Analysis of immune cell infiltration and glial activation dynamics.
  • Investigation of signaling pathways involving DAMPs, cytokines, and chemokines.

Main Results:

  • Neutrophils are rapidly recruited to clear debris and limit injury spread.
  • Microglia and astrocytes form a barrier at the injury site, facilitating repair.
  • Monocyte infiltration aids in astrocyte recruitment and brain tissue repair.
  • Neurons and astrocytes modulate inflammation, while T and B cells may be recruited later.

Conclusions:

  • The brain mounts a complex, multi-stage immune and cellular response to traumatic brain injury.
  • Specific immune cells and glial cells orchestrate distinct phases of injury management and repair.
  • Understanding these cellular dynamics is crucial for developing therapeutic strategies for TBI.