Abstract |
A 78 kDa gastrin- binding protein is a likely target for the anti-proliferative effects of the cholecystokinin ( CCK) receptor antagonists D,L-4-benzamido-N,N-dipropylglutaramic acid ( proglumide) and N-4-chlorobenzoyl-L-tryptophan ( benzotript) on colorectal carcinoma cell lines [Baldwin, G.S., 1994. Antiproliferative gastrin/ cholecystokinin receptor antagonists target the 78-kDa gastrin- binding protein. Proc. Natl. Acad. Sci. USA 91, 7593-7597.]. Definition of the physiological role of the gastrin- binding protein has been hampered by the very low affinity of benzotript for the gastrin- binding protein. Benzotript analogues were therefore tested for their ability to inhibit the binding of iodinated gastrin to the gastrin- binding protein. The affinity of the most potent analogue (the D-isomer of benzotript, CR 665) was similar to the value reported previously for the L-isomer. In order to isolate more potent binding inhibitors, several selective CCK receptor antagonists were also tested as inhibitors of the binding of gastrin to the gastrin- binding protein. The affinity of the most potent binding inhibitor PD 149164 (benzenebutanoic acid, 4-fluoro-! b/-[[3-(1H-indol-3-yl)-2-methyl-1-oxo-2-[[(tricyclo-[3.3 .1. 1(3,7)]dec-2-yloxy)carbonyl]amino]propyl]amino]-, [R-(R*,S*)]-) was approximately 10-fold higher than the L-isomer of benzotript. PD 149164 may serve as the lead compound for the future development of more potent and selective gastrin- binding protein inhibitors.
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Authors | K A Rorison, Z Yang, G S Baldwin |
Journal | European journal of pharmacology
(Eur J Pharmacol)
Vol. 388
Issue 1
Pg. 9-15
(Jan 24 2000)
ISSN: 0014-2999 [Print] Netherlands |
PMID | 10657541
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Anti-Ulcer Agents
- Benzamides
- Carrier Proteins
- Fatty Acids
- Gastrins
- Indoles
- Multienzyme Complexes
- PD 149164
- Receptors, Cholecystokinin
- Mitochondrial Trifunctional Protein
- Proglumide
- benzotript
- Adamantane
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Topics |
- Adamantane
(analogs & derivatives, pharmacology)
- Animals
- Anti-Ulcer Agents
(metabolism, pharmacology)
- Benzamides
(metabolism, pharmacology)
- Carrier Proteins
(antagonists & inhibitors, isolation & purification, metabolism)
- Cells, Cultured
- Fatty Acids
(metabolism)
- Fibroblasts
(metabolism)
- Gastrins
(metabolism)
- Humans
- Indoles
(pharmacology)
- Mitochondria
(metabolism)
- Mitochondrial Trifunctional Protein
- Multienzyme Complexes
- Oxidation-Reduction
- Proglumide
(metabolism, pharmacology)
- Protein Binding
- Receptors, Cholecystokinin
(agonists, antagonists & inhibitors)
- Swine
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