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Related Concept Videos

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...
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...
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...
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,...
What is the Immune System?01:38

What is the Immune System?

Overview
Immune Surveillance by NK Cells and Phagocytes01:25

Immune Surveillance by NK Cells and Phagocytes

Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...

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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

Pathogen recognition by innate receptors.

Yutaro Kumagai1, Osamu Takeuchi, Shizuo Akira

  • 1Laboratory of Host Defense, WPI Immunology Frontier Research Center, 3-1 Yamada-oka, Suita, Osaka, 565-0871, Japan.

Journal of Infection and Chemotherapy : Official Journal of the Japan Society of Chemotherapy
|July 16, 2008
PubMed
Summary
This summary is machine-generated.

Host immune cells use germline-encoded pattern recognition receptors (PRRs), including Toll-like receptors (TLRs), retinoic acid-inducible gene I-like helicases (RLHs), and NOD-like receptors (NLRs), to detect microbial invaders and initiate antiviral immunity.

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Last Updated: Jul 3, 2026

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Stimulation of Cytoplasmic DNA Sensing Pathways In Vitro and In Vivo
11:44

Stimulation of Cytoplasmic DNA Sensing Pathways In Vitro and In Vivo

Published on: September 18, 2014

Area of Science:

  • Immunology
  • Microbiology
  • Molecular Biology

Background:

  • Host immune responses are crucial for combating microbial infections.
  • Pattern Recognition Receptors (PRRs) are key to detecting pathogens.
  • Toll-like Receptors (TLRs), cytosolic RIG-I-like helicases (RLHs), and NOD-like Receptors (NLRs) are critical PRRs.

Purpose of the Study:

  • To review pathogen recognition mechanisms by PRRs.
  • To elucidate signaling pathways activated by these receptors.
  • To describe the in vivo roles of PRRs in innate antiviral immunity.

Main Methods:

  • Literature review of recent studies on PRRs.
  • Analysis of pathogen recognition by TLRs, RLHs, and NLRs.
  • Examination of signaling cascades and in vivo immune functions.

Main Results:

  • PRRs, including TLRs, RLHs, and NLRs, are essential for microbial detection.
  • These receptors initiate distinct signaling pathways upon pathogen recognition.
  • Differential utilization of PRRs by the host leads to robust immune responses.

Conclusions:

  • Understanding PRR-mediated pathogen recognition is vital for innate immunity.
  • RLHs and NLRs play significant roles in cytosolic pathogen sensing.
  • This review consolidates knowledge on PRRs in antiviral defense.