当前位置： SCI文献检索 > JOURNAL OF MEDICINAL CHEMISTRY期刊下所有文献 > Studies on neurokinin antagonists. 2. Design and structure-activity relationships of novel tripeptide substance P antagonists, N alpha-[N alpha-(N alpha-acetyl-L-threonyl)-N1-formyl-D-tryptophyl]-N- methyl-N-(phenylmethyl)-L-phenylalaninamide and its rela

Studies on neurokinin antagonists. 2. Design and structure-activity relationships of novel tripeptide substance P antagonists, N alpha-[N alpha-(N alpha-acetyl-L-threonyl)-N1-formyl-D-tryptophyl]-N- methyl-N-(phenylmethyl)-L-phenylalaninamide and its rela

Abstract：

:Continuing studies on the chemical modification of the previously reported novel tripeptide SP antagonist, N alpha-[N alpha-[N alpha- (tert-butyloxycarbonyl)glutaminyl]-N1-formyl-D-tryptophyl]phenylalanine benzyl ester [Boc-Gln-D-Trp-(CHO)-Phe-OBzl (1)], are described herein. We initially investigated the stability of 1 in guinea pig plasma and liver homogenate to elucidate the most labile part in the structure. It was consequently revealed that the benzyl ester part was easily hydrolyzed to produce the inactive acid analog. Thus we searched for a benzyl ester surrogate that would be more resistant to hydrolytic enzymes. This approach found an isosteric amide structure, N-methyl-N-(phenylmethyl)amide, suitable in terms of potency and stability. Subsequent modification of the amino terminal into N alpha-acetyl-L-threonine led to the most potent compound, N alpha-[N alpha-(N alpha-acetyl-L-threonyl)-N1-formyl-D-tryptophyl]-N- methyl-N-(phenylmethyl)-L-phenylalaninamide [Ac-Thr-D-Trp(CHO)-Phe-NMeBzl (5a, FR113680)]. This compound 5a potently blocked 3H-SP binding to guinea pig lung membranes with IC50 of (5.8 +/- 0.78) x 10(-9) M. In vitro, 5a inhibited SP-induced contraction of isolated guinea pig trachea strips with IC50 of 2.3 x 10(-6) M and caused no contraction when used alone in this preparation up to 3.2 x 10(-5) M. In addition 5a exhibited no effect on the contraction induced by histamine or acetylcholine. Intriguingly, it was demonstrated in vivo that 5a suppressed the SP-induced bronchoconstriction and airway edema in guinea pigs with ED50 of 0.42 mg/kg and 0.66 mg/kg, respectively, when administered intravenously.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Hagiwara D,Miyake H,Morimoto H,Murai M,Fujii T,Matsuo M

doi

10.1021/jm00095a013

keywords:

subject

Has Abstract

pub_date

1992-08-21 00:00:00

pages

3184-91

issue

17

eissn

0022-2623

issn

1520-4804

journal_volume

35

pub_type

杂志文章

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