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From the Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesia, Perioperative and Pain Medicine, Brigham and Womens Hospital, and Harvard Medical School, Boston, Massachusetts
Aspirin-triggered lipoxin A4 (ATL,
15-epi-LXA4) and leukotriene D4
(LTD4) possess opposing vascular actions mediated via
receptors distinct from the LXA4 receptor (ALX) that is
involved in leukocyte trafficking. Here, we identified these
receptors by nucleotide sequencing and demonstrate that
LTD4 receptor (CysLT1) is induced in human
vascular endothelia by interleukin-1ß. Recombinant CysLT1
receptor gave stereospecific binding with both
[3H]-LTD4 and a novel labeled mimetic of ATL
([3H]-ATLa) that was displaced with LTD4 and
ATLa (
IC50 0.2 to 0.9 nmol/L), but not with a
bioinactive ATL isomer. The clinically used CysLT1 receptor
antagonist, Singulair, showed a lower rank order for
competition with [3H]-ATLa (IC50
8.3
nmol/L). In contrast, LTD4 was an ineffective
competitive ligand for recombinant ALX receptor with
[3H]-ATLa, and ATLa did not compete for
[3H]-LTB4 binding with recombinant
LTB4 receptor. Endogenous murine CysLT1
receptors also gave specific [3H]-ATLa binding that was
displaced with essentially equal affinity by LTD4 or ATLa.
Systemic ATLa proved to be a potent inhibitor (>50%) of
CysLT1-mediated vascular leakage in murine skin (200
µg/kg) in addition to its ability to block polymorphonuclear
leukocyte recruitment to dorsal air pouch (4 µg/kg). These
results indicate that ATL and LTD4 bind and compete with
equal affinity at CysLT1, providing a molecular
basis for aspirin-triggered LXs serving as a local damper of both
vascular CysLT1 signals as well as ALX receptor-regulated
polymorphonuclear leukocyte traffic.
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