The significance of toll-like receptors in human diseases

M T Montero Vega1, A de Andrés Martín

  • 1Servicio de Bioquímica-Investigación, Madrid, Spain. teresa.montero@hrc.es

Insights

Toll-like receptors (TLRs) recognize microbial and tissue damage signals, initiating immune responses. Understanding TLRs is crucial for developing treatments for infections and inflammatory diseases like cancer and autoimmunity.

Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • Toll-like receptors (TLRs) are evolutionarily conserved transmembrane receptors.
  • They recognize microbial components and endogenous danger signals.
  • TLR activation triggers signaling pathways, leading to gene expression and immune responses.

Purpose of the Study:

  • To highlight the critical role of TLRs in innate and adaptive immunity.
  • To emphasize the involvement of TLRs in various non-infective inflammatory disorders.
  • To underscore the therapeutic potential of targeting TLRs for human diseases.

Main Methods:

  • Analysis of mutations and experimental models affecting TLR function.
  • Review of existing literature on TLR signaling and disease pathogenesis.

Main Results:

  • TLRs are essential for coordinating innate immunity, modulating adaptive immunity, and promoting tissue repair.
  • Dysfunctional TLRs are implicated in susceptibility to infections.
  • TLRs play a significant role in the pathogenesis of inflammatory conditions including cancer, allergy, autoimmunity, inflammatory bowel disease, and atherosclerosis.

Conclusions:

  • TLRs are central regulators of immune responses and tissue homeostasis.
  • Targeting TLRs offers promising avenues for novel vaccines and therapies.
  • Further research into TLRs can lead to innovative treatments for a wide range of human diseases.

Related Concept Videos

Signal Transduction: Overview01:26

Signal Transduction: Overview

Cells respond to many types of information, often through receptor proteins positioned on the membrane. They respond to chemical signals, such as hormones, neurotransmitters, and other signaling molecules, initiating a series of molecular reactions to produce an appropriate response. This is called signal transduction. Cells also coordinate different responses elicited by the same signaling molecule via mediators, allowing molecular cross-talk.
Typically, signal transduction involves three...
The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
Transducer Mechanism: Enzyme-Linked Receptors01:27

Transducer Mechanism: Enzyme-Linked Receptors

Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
NF-κB-dependent Signaling Pathway02:26

NF-κB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
T Cell Types and Functions01:24

T Cell Types and Functions

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...
Notch Signaling Pathway03:14

Notch Signaling Pathway

The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...