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Phagocyte Activation by Trp–Lys–Tyr–Met–Val–Met, Acting through FPRL1/LXA 4 R, is not Affected by Lipoxin A 4
Author(s) -
Christophe T.,
Karlsson A.,
Rabiet M.J.,
Boulay F.,
Dahlgren C.
Publication year - 2002
Publication title -
scandinavian journal of immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.934
H-Index - 88
eISSN - 1365-3083
pISSN - 0300-9475
DOI - 10.1046/j.1365-3083.2002.01149.x
Subject(s) - formyl peptide receptor , lipoxin , agonist , receptor , respiratory burst , downregulation and upregulation , chemistry , transfection , microbiology and biotechnology , chemotaxis , n formylmethionine leucyl phenylalanine , biology , biochemistry , gene
Lipoxin A 4 (LXA 4 ) has been shown to bind to the leucocyte formyl peptide receptor (FPR) homologue, FPRL1, without triggering the biological activities induced by other FPRL1 agonists. We investigated the direct effect of LXA 4 as well as the effect on agonist‐induced biological responses using transfected HL‐60 cells expressing FPR, FPRL1 or FPRL2. LXA 4 neither induced an intracellular rise in calcium in these transfectants nor affected the response induced by the peptide Trp–Lys–Tyr–Met–Val–Met (WKYMVM), an agonist that activates cells through FPRL1 and ‐2. Both agonists induced Erk‐2 activation; however, the eicosanoid‐induced activity was independent of FPRL1 and FPRL2. Moreover, LXA 4 was unable to trigger neutrophil upregulation of complement receptor 3 and respiratory burst, and it had no effect on the responses induced by triggering with WKYMVM. We conclude that LXA 4 is unable to affect the WKYMVM‐induced signalling through FPRL1 and suggest that it acts through a receptor different from FPRL1.