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Molecular Pharmacology

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Abstract

Characterization of a 5-lipoxygenase-activating protein binding assay: correlation of affinity for 5-lipoxygenase-activating protein with leukotriene synthesis inhibition.

S Charleson, P Prasit, S Léger, J W Gillard, P J Vickers, J A Mancini, P Charleson, J Guay, A W Ford-Hutchinson and J F Evans
Molecular Pharmacology May 1992, 41 (5) 873-879;
S Charleson
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P Prasit
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S Léger
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J W Gillard
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P J Vickers
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J A Mancini
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P Charleson
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J Guay
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A W Ford-Hutchinson
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J F Evans
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Abstract

A binding assay has been developed to measure the affinity of leukotriene synthesis inhibitors for 5-lipoxygenase-activating protein (FLAP), using human leukocyte membranes as the source of FLAP and a radioiodinated leukotriene synthesis inhibitor, 125I-L-691,831, as ligand. Linearity of specific binding of radiolabeled ligand was demonstrated with increasing protein and ligand concentrations. Saturation analysis of radioligand binding showed a Kd of 6 nM and a Bmax that, depending on the membrane preparation, varied between 8 and 53 pmol/mg of protein. An excellent correlation was shown between affinity for FLAP in the binding assay and inhibition of leukotriene synthesis in human polymorphonuclear leukocytes for compounds from two structurally distinct classes, namely indoles and quinolines. A large number of membrane-active compounds did not compete with 125I-L-691,831 binding to FLAP. In addition, direct 5-lipoxygenase inhibitors and a selection of eicosanoids were unable to compete for FLAP binding. This study validates a selective binding assay for leukotriene synthesis inhibitors whose protein target is FLAP.

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Molecular Pharmacology
Vol. 41, Issue 5
1 May 1992
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Abstract

Characterization of a 5-lipoxygenase-activating protein binding assay: correlation of affinity for 5-lipoxygenase-activating protein with leukotriene synthesis inhibition.

S Charleson, P Prasit, S Léger, J W Gillard, P J Vickers, J A Mancini, P Charleson, J Guay, A W Ford-Hutchinson and J F Evans
Molecular Pharmacology May 1, 1992, 41 (5) 873-879;

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Abstract

Characterization of a 5-lipoxygenase-activating protein binding assay: correlation of affinity for 5-lipoxygenase-activating protein with leukotriene synthesis inhibition.

S Charleson, P Prasit, S Léger, J W Gillard, P J Vickers, J A Mancini, P Charleson, J Guay, A W Ford-Hutchinson and J F Evans
Molecular Pharmacology May 1, 1992, 41 (5) 873-879;
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