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Related Concept Videos

Introduction to Innate and Adaptive Immunity01:21

Introduction to Innate and Adaptive Immunity

The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
Innate immunity is the body's natural, nonspecific defense system that acts quickly to protect against pathogens. It incorporates physical barriers like skin and mucous membranes and cellular elements such as phagocytes and natural killer cells. This part of our immune system provides an immediate,...
Cells of the Innate Immune Response01:28

Cells of the Innate Immune Response

The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
What is the Immune System?01:38

What is the Immune System?

Overview

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Related Experiment Video

Updated: May 13, 2026

T Cells Capture Bacteria by Transinfection from Dendritic Cells
11:39

T Cells Capture Bacteria by Transinfection from Dendritic Cells

Published on: January 13, 2016

Host innate immune responses to microbial pathogens.

Julie Delaloye1, Thierry Calandra

  • 1Infectious Diseases Service, Department of Medicine, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland.

Current Vascular Pharmacology
|March 20, 2013
PubMed
Summary
This summary is machine-generated.

Sepsis, a deadly host response to infection, involves dysregulated immune reactions. Understanding innate immune sensors like pattern-recognition receptors is key to developing effective sepsis treatments.

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Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages
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Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages

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Last Updated: May 13, 2026

T Cells Capture Bacteria by Transinfection from Dendritic Cells
11:39

T Cells Capture Bacteria by Transinfection from Dendritic Cells

Published on: January 13, 2016

Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling
09:51

Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling

Published on: July 26, 2017

Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages
12:47

Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages

Published on: November 3, 2014

Area of Science:

  • Immunology
  • Infectious Diseases
  • Critical Care Medicine

Background:

  • Sepsis is a major global health threat with increasing incidence.
  • It is characterized by a dysregulated immune response to infection, potentially leading to organ failure and death.

Observation:

  • Innate immune sensors, termed pattern-recognition receptors (PRRs), initiate host defense.
  • PRRs include complement system, Toll-like receptors, NOD-like receptors, RIG-I-like helicases, and C-type lectin receptors.
  • Activated PRRs trigger intracellular cascades, influencing innate and adaptive immunity.

Findings:

  • Despite advances in understanding molecular mechanisms, therapies targeting innate immune pathways have largely failed.
  • Recent clinical trials for adjunctive anti-sepsis treatments show minimal impact on sepsis morbidity and mortality.

Implications:

  • Further research into the transition from infection to sepsis is crucial for developing effective treatments.
  • Continued investigation in both laboratory and clinical settings is necessary to address the sepsis challenge.