Exp Mol Med.  2007 Aug;39(4):421-438.

Toll-like receptor signal transduction

Affiliations
  • 1Department of Molecular Science and Technology, Ajou University, Suwon 443-749, Korea. sangdunchoi@ajou.ac.kr
  • 2Institute of Advanced Biosciences, Keio University, Yamagata 997-0035, Japan.
  • 3Brain Disease Research Center, Ajou University School of Medicine, Suwon 443-749, Korea.
  • 4Department of Biological Sciences, College of Natural Science, Ajou University, Suwon 443-749, Korea.

Abstract

Toll-like receptors (TLRs) are the archetypal pattern recognition receptors in sensing exogenous pathogens. Activation of TLRs is a first line of defense of the immune system, leading to the activation and recruitment of neutrophils and macrophages to sites of infection and enhances antimicrobial activity. The TLR signaling through different intracellular molecules, such as MAP kinases and IkappaB kinases which are conserved signaling elements for many receptors, leads to a distinct set of proinflammatory gene expressions. However, how these pathways differentially and precisely control the transcription of identical genes remains largely unknown. Our review focuses on the details of up-to- date signaling molecules including negative regulators and their role in controlling innate immune response. We also stress the importance of developing systemic approaches for the global understanding of TLR signaling so that appropriate drug therapeutic targets can be identified for regulating inflammatory diseases.

Keyword

immunity, natural; ligands; signal transduction; systems biology; Toll-like receptors

MeSH Terms

Adaptor Proteins, Signal Transducing/*immunology
Animals
Humans
MAP Kinase Signaling System/*immunology
Receptor Cross-Talk
Receptors, Interleukin-1/immunology
*Signal Transduction
Toll-Like Receptors/*immunology
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