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Related Concept Videos

Inflammatory Response01:28

Inflammatory Response

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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
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Inflammation01:38

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Overview
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T Cell Types and Functions01:24

T Cell Types and Functions

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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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
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GPCRs Regulate Adenylyl Cylase Activity01:09

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Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
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Related Experiment Video

Updated: Dec 17, 2025

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

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Cathelicidins Modulate TLR-Activation and Inflammation.

Maaike R Scheenstra1, Roel M van Harten1, Edwin J A Veldhuizen1

  • 1Division of Infectious Diseases and Immunology, Department of Biomolecular Health Sciences, Utrecht University, Utrecht, Netherlands.

Frontiers in Immunology
|June 26, 2020
PubMed
Summary

Cathelicidins, key innate immune peptides, modulate Toll-like receptor (TLR) activation by interacting with microbial patterns. This impacts host defense, autoimmune inflammation, and therapeutic applications.

Keywords:
DAMPsLL-37MAMPsToll-like receptorsantimicrobial peptidescathelicidinsdendritic cellsmacrophages

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Myeloid Innate Signaling Pathway Regulation by MALT1 Paracaspase Activity
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Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells
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Area of Science:

  • Immunology
  • Innate Immunity
  • Molecular Biology

Background:

  • Cathelicidins are cationic peptides integral to the innate immune system.
  • Initially recognized for direct antimicrobial activity, their immunomodulatory roles are increasingly significant.

Purpose of the Study:

  • To comprehensively review the immunomodulatory functions of cathelicidins.
  • To focus on their effects on Toll-like receptor (TLR) activation by various molecular patterns.

Main Methods:

  • Literature review focusing on cathelicidin interactions with lipidic (LPS, lipoproteins) and nucleic acid (RNA, DNA) TLR ligands.
  • Analysis of direct and indirect mechanisms influencing TLR signaling pathways.
  • Discussion of implications in host response to infection and autoimmune diseases.

Main Results:

  • Cathelicidins directly modulate TLR activation by altering ligand stability, cellular uptake, and receptor interactions.
  • Indirect mechanisms involving downstream TLR signaling are also affected by cathelicidins.
  • These modulations influence host defense against pathogens and the exacerbation of autoimmune inflammation.

Conclusions:

  • Cathelicidin interactions with TLRs are crucial for immune response regulation.
  • Understanding these mechanisms offers potential for therapeutic strategies in infectious diseases, autoimmune conditions, and cancer therapy.
  • Exploiting cathelicidin immunomodulatory activities is promising for vaccine development.