Journal
IMMUNOGENETICS
Volume 60, Issue 2, Pages 83-93Publisher
SPRINGER
DOI: 10.1007/s00251-008-0277-3
Keywords
chemoattractant receptor; inflammation; chemotaxis; cell signaling; haplotype
Categories
Funding
- NCRR NIH HHS [P20 RR-016464, P20 RR016464] Funding Source: Medline
- NIAID NIH HHS [R01 AI051726-04, R01 AI051726, R01 AI51726] Funding Source: Medline
- NIDCR NIH HHS [R21DE16114, R21 DE016114] Funding Source: Medline
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The chemoattractant neutrophil formyl peptide receptor (FPR) binds bacterial and mitochondrial N-formylated peptides, which allows the neutrophils to find the bacterial source and/or site of tissue damage. Certain inflammatory disorders may be due in part to an impaired innate immune system that does not respond to acute bacterial damage in a timely fashion. Because the human FPR is encoded by a large number of different haplotypes arising from ten single-nucleotide polymorphisms, we examined the possibility that some of these haplotypes are functionally distinct. We analyzed the response of three common FPR haplotypes to peptides from Escherichia coli, Mycobacterium avium ssp. paratuberculosis, and human mitochondria. All three haplotypes responded similarly to the E. coli and mitochondrial peptides, whereas one required a higher concentration of the M. avium peptide fMFEDAVAWF for receptor downregulation, receptor signaling, and chemotaxis. This raises the possibility of additional bacterial species differences in functional responses among FPR variants and establishes a precedent with potentially important implications for our innate immune response against bacterial infections. We also investigated whether certain FPR haplotypes are associated with rheumatoid arthritis (RA) by sequencing FPR1 from 148 Caucasian individuals. The results suggested that FPR haplotypes do not significantly contribute toward RA.
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