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Prion diseases are transmissible and fatal neurodegenerative disorders which involve infiltration and activation of mononuclear phagocytes at the brain lesions. A 20-aa acid fragment of the human cellular prion protein, PrP(106-126), was reported to mimic the biological activity of the pathologic isoform of prion and activates mononuclear phagocytes. The cell surface receptor(s) mediating the activity of PrP(106-126) is unknown. In this study, we show that PrP(106-126) is chemotactic for human monocytes through the use of a G protein-coupled receptor formyl peptide receptor-like 1 (FPRL1), which has been reported to interact with a diverse array of exogenous or endogenous ligands. Upon stimulation by PrP(106-126), FPRL1 underwent a rapid internalization and, furthermore, PrP(106-126) enhanced monocyte production of proinflammatory cytokines, which was inhibited by pertussis toxin. Thus, FPRL1 may act as a "pattern recognition" receptor that interacts with multiple pathologic agents and may be involved in the proinflammatory process of prion diseases.

the journal of immunology/the journal of immunology

Cutting Edge: The Neurotoxic Prion Peptide Fragment PrP106–126 Is a Chemotactic Agonist for the G Protein-Coupled Receptor Formyl Peptide Receptor-Like 1