Discovery of a novel CCR3 selective antagonist
In searching for a novel CCR3 receptor antagonist, we designed a library that included a variety of carboxamide derivatives based on the structure of our potent antagonists for human CCR1 and CCR3 receptors, and screened the new compounds for inhibitory activity against 125I-Eotaxin binding to human...
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Veröffentlicht in: | Bioorganic & medicinal chemistry letters 2001-05, Vol.11 (9), p.1219-1223 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In searching for a novel CCR3 receptor antagonist, we designed a library that included a variety of carboxamide derivatives based on the structure of our potent antagonists for human CCR1 and CCR3 receptors, and screened the new compounds for inhibitory activity against
125I-Eotaxin binding to human CCR3 receptors expressed in CHO cells. Among them, two 2-(benzothiazolethio)acetamide derivatives (
1a and
2a) showed binding affinities with IC
50 values of 750 and 1000
nM, respectively, for human CCR3 receptors. These compounds (
1a and
2a) also possessed weak binding affinities for human CCR1 receptors. We selected
1a as a lead compound for derivatization to improve in vitro potency and selectivity for CCR3 over CCR1 receptors. Derivatization of
1a by incorporating substituents into each benzene ring of the benzothiazole and piperidine side chain resulted in the discovery of a compound (
1b) exhibiting 820-fold selectivity for CCR3 receptors (IC
50=2.3
nM) over CCR1 receptors (IC
50=1900
nM). This compound (
1b) also showed potent functional antagonist activity for inhibiting Eotaxin (IC
50=27
nM)- or RANTES (IC
50=13
nM)-induced Ca
2+ increases in eosinophils.
A 2-(benzothiazolethio)acetamide derivative (
1b) was discovered as a CCR3 selective antagonist. |
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ISSN: | 0960-894X 1464-3405 |
DOI: | 10.1016/S0960-894X(01)00176-7 |