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Pattern recognitions receptors in immunodeficiency disorders.

Esameil Mortaz1, Ian M Adcock2, Payam Tabarsi3

  • 1Department of Immunology, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Clinical Tuberculosis and Epidemiology Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran.

European Journal of Pharmacology
|January 18, 2017
PubMed
Summary
This summary is machine-generated.

Pattern recognition receptors (PRRs) are crucial for innate immunity. This review details how defects in Toll-like receptor (TLR) signaling cause various primary immune deficiencies (PIDs), impacting susceptibility to infections.

Keywords:
Chronic granulomatous diseaseIgE syndromePrimary immune deficienciesTLRs

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Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • Pattern recognition receptors (PRRs) detect pathogen-associated molecular patterns (PAMPs) to initiate innate immune responses.
  • Key PRR classes include Toll-like receptors (TLRs), C-type lectin receptors (CLRs), and Nod-like receptors (NLRs).
  • Primary immune deficiencies (PIDs) affecting PRR signaling highlight their critical role in host defense.

Purpose of the Study:

  • To review the role of TLRs and their downstream signaling pathways in various primary immune deficiencies (PIDs).
  • To elucidate the impact of genetic defects in TLR signaling components on immune system function and infection susceptibility.

Main Methods:

  • Literature review of studies on PRRs, TLRs, and PIDs.
  • Analysis of clinical and genetic data linking TLR pathway defects to specific immune disorders.
  • Summarization of known functional alterations in TLR responses across different PIDs.

Main Results:

  • Defects in TLR signaling components like MyD88 and NEMO lead to susceptibility to bacterial, viral, and fungal infections.
  • Specific TLR defects, such as TLR3 deficiency, are linked to herpes simplex virus encephalitis.
  • Altered TLR responses (up or down-regulated) are observed in various PIDs including CVID, CGD, XLA, HIES, and ADA deficiency.

Conclusions:

  • TLRs and their downstream pathways are essential for effective immune responses against diverse pathogens.
  • Dysregulation of TLR signaling is a common feature in many PIDs, contributing to increased infection risk.
  • Understanding these pathways is crucial for diagnosing and potentially treating PIDs.