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.
Inhibitory pattern recognition receptors
Disclosures: L. Meyaard reported grants from Boehringer Ingelheim, NextCure, and NGM Biopharmaceuticals outside the submitted work. No other disclosures were reported.
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Matevž Rumpret, Helen J. von Richthofen, Victor Peperzak, Linde Meyaard; Inhibitory pattern recognition receptors. J Exp Med 3 January 2022; 219 (1): e20211463. doi: https://doi.org/10.1084/jem.20211463
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