Abstract:
:Repertaxin is a new non-competitive allosteric blocker of interleukin-8 (CXCL8/IL-8) receptors (CXCR1/R2), which by locking CXCR1/R2 in an inactive conformation prevents receptor signaling and human polymorphonuclear leukocyte (PMN) chemotaxis. Given the unique mode of action of repertaxin it was important to examine the ability of repertaxin to inhibit a wide range of biological activities induced by CXCL8 in human leukocytes. Our results show that repertaxin potently and selectively blocked PMN adhesion to fibrinogen and CD11b up-regulation induced by CXCL8. Reduction of CXCL8-mediated PMN adhesion by repertaxin was paralleled by inhibition of PMN activation including secondary and tertiary granule release and pro-inflammatory cytokine production, whereas PMN phagocytosis of Escherichia coli bacteria was unaffected. Repertaxin also selectively blocked CXCL8-induced T lymphocyte and natural killer (NK) cell migration. These data suggest that repertaxin is a potent and specific inhibitor of a wide range of CXCL8-mediated activities related to leukocyte recruitment and functional activation in inflammatory sites.
journal_name
Biochem Pharmacoljournal_title
Biochemical pharmacologyauthors
Casilli F,Bianchini A,Gloaguen I,Biordi L,Alesse E,Festuccia C,Cavalieri B,Strippoli R,Cervellera MN,Di Bitondo R,Ferretti E,Mainiero F,Bizzarri C,Colotta F,Bertini Rdoi
10.1016/j.bcp.2004.10.007subject
Has Abstractpub_date
2005-02-01 00:00:00pages
385-94issue
3eissn
0006-2952issn
1873-2968pii
S0006-2952(04)00728-2journal_volume
69pub_type
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