Pathogen-associated and damage-associated molecular patterns (PAMPs/DAMPs)

Inflammation and infection site–associated molecular components refers to a broad category of molecules that serve as signals for the innate immune system to identify the presence of pathogens or tissue injury. These are primarily classified into Pathogen-Associated Molecular Patterns (PAMPs), which are unique to microbes (e.g., lipopolysaccharides, peptidoglycans), and Damage-Associated Molecular Patterns (DAMPs), which are endogenous molecules released by stressed or dying host cells (e.g., HMGB1, ATP, mitochondrial DNA). These components are recognized by Pattern Recognition Receptors (PRRs) on the surface of or within immune cells, leading to the activation of inflammatory pathways and the recruitment of leukocytes. In therapeutic contexts, these molecular components are targeted for neutralization or their receptors are blocked to mitigate excessive inflammation in conditions such as sepsis, rheumatoid arthritis, and acute respiratory distress syndrome (ARDS). They also function as vital biomarkers for the clinical assessment of infection severity and inflammatory status.

Other names

Inflammation and infection site–associated molecular componentsMicrobe-associated molecular patternsMAMPsAlarminsExogenous and endogenous danger signalsMolecular patterns

Neutralization of pro-inflammatory ligands (e.g., LPS, HMGB1, cytokines) or competitive inhibition of their binding to pattern recognition receptors (PRRs) or cytokine receptors to prevent the initiation and amplification of inflammatory cascades.