Inhibitory pattern recognition receptors

J Exp Med. 2022 Jan 3;219(1):e20211463. doi: 10.1084/jem.20211463. Epub 2021 Dec 14.


Pathogen- and damage-associated molecular patterns are sensed by the immune system's pattern recognition receptors (PRRs) upon contact with a microbe or damaged tissue. In situations such as contact with commensals or during physiological cell death, the immune system should not respond to these patterns. Hence, immune responses need to be context dependent, but it is not clear how context for molecular pattern recognition is provided. We discuss inhibitory receptors as potential counterparts to activating pattern recognition receptors. We propose a group of inhibitory pattern recognition receptors (iPRRs) that recognize endogenous and microbial patterns associated with danger, homeostasis, or both. We propose that recognition of molecular patterns by iPRRs provides context, helps mediate tolerance to microbes, and helps balance responses to danger signals.

Publication types

  • Review

MeSH terms

  • Animals
  • Disease Susceptibility
  • Gene Expression Regulation
  • Homeostasis
  • Host-Pathogen Interactions / genetics
  • Host-Pathogen Interactions / immunology
  • Humans
  • Immune System / cytology
  • Immune System / immunology
  • Immune System / metabolism
  • Immune Tolerance
  • Immunity
  • Immunity, Innate
  • Inflammation / etiology
  • Inflammation / metabolism
  • Inflammation / pathology
  • Organ Specificity
  • Receptors, Pattern Recognition / physiology*
  • Signal Transduction


  • Receptors, Pattern Recognition