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Acute Inflammation I: Cellular Phase01:26

Acute Inflammation I: Cellular Phase

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The cellular phase of acute inflammation is a tightly orchestrated sequence of events that recruits leukocytes, primarily neutrophils, to sites of tissue injury or infection. Following the initial vascular changes, this phase ensures effective immune cell migration, activation, and function at the affected site to eliminate pathogens and initiate tissue repair.Leukocyte Recruitment CascadeLeukocyte recruitment happens in four steps: margination, adhesion, transmigration, and chemotaxis. Reduced...
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An adult in good health typically has between 4,500 and 11,000 leukocytes, or white blood cells, per microliter of blood, which constitutes about 1% of the total blood volume. Unlike red blood cells, white blood cells contain a nucleus and other cellular organelles but do not have hemoglobin. Most white blood cells reside in connective tissues, particularly in lymphatic organs such as the lymph nodes, with only a small fraction present in circulating blood.
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Acute Inflammation I: Inflammatory Response01:26

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Acute inflammation is a rapid, short-lived physiological response to tissue injury or infection, designed to eliminate harmful agents and initiate repair. This tightly regulated process typically lasts from minutes to several days and is triggered by factors such as microbial invasion, physical trauma, or chemical injury.Recognition and Mediator ReleaseThe inflammatory response begins when resident immune cells—such as mast cells, macrophages, and dendritic cells—detect...
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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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Related Experiment Video

Updated: Apr 19, 2026

In Vivo Imaging Uncovers the Migratory Behavior of Leukocytes within the Joints
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Leukocyte migration into inflamed tissues.

Sussan Nourshargh1, Ronen Alon2

  • 1William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK.

Immunity
|December 18, 2014
PubMed
Summary
This summary is machine-generated.

Leukocyte migration into tissues is crucial for immune responses. This review covers how immune cells like neutrophils and T cells move through blood vessel walls to reach infection sites.

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Area of Science:

  • Immunology
  • Cell Biology
  • Vascular Biology

Background:

  • Leukocyte migration is essential for immune surveillance and response to infection, injury, or stress.
  • This process involves complex interactions between leukocytes and the vascular endothelium.
  • Understanding these interactions is key to modulating immune responses in extralymphoid organs.

Purpose of the Study:

  • To review current knowledge on leukocyte migration mechanisms through activated venular walls.
  • To identify open questions regarding effector leukocyte interactions with peripheral vessels.
  • To discuss the roles of various cell types in regulating leukocyte extravasation.

Main Methods:

  • Review of existing literature on leukocyte trafficking and immune cell interactions.
  • Analysis of mechanisms governing leukocyte adhesion, shape change, and transmigration.
  • Discussion of the roles of endothelial cells, pericytes, macrophages, and mast cells.

Main Results:

  • Leukocyte stimulation enhances adhesion and shape changes, facilitating attachment to venular walls.
  • Polarized motility and transient barrier disruption by vascular cells enable leukocyte passage.
  • Perivascular cells (macrophages, mast cells) modulate leukocyte exit from the vascular lumen.

Conclusions:

  • Leukocyte extravasation is a multi-step process involving dynamic cellular interactions.
  • Further research is needed to fully elucidate the mechanisms governing leukocyte trafficking in extralymphoid tissues.
  • Targeting these mechanisms could offer therapeutic strategies for inflammatory and immune diseases.