Carbobenzoxy amino acids: Structural requirements for cholecystokinin receptor antagonist activity

Journal Article · Mon Apr 01 04:00:00 EST 1985 · Am. J. Physiol.; (United States)

OSTI ID:5483935

Maton, P N; Sutliff, V E; Jensen, R T; Gardner, J D

The authors used dispersed acini prepared from guinea pig pancreas to examine 28 carbobenzoxy (CBZ) amino acids for their abilities to function as cholecystokinin receptor antagonists. All amino acid derivatives tested, except for CBZ-alanine, CBZ-glycine, and N alpha-CBZ- lysine, were able to inhibit the stimulation of amylase secretion caused by the C-terminal octapeptide of cholecystokinin. In general, there was a good correlation between the ability of a carbobenzoxy amino acid to inhibit stimulated amylase secretion and the ability of the amino acid derivative to inhibit binding of /sup 125/I-cholecystokinin. The inhibition of cholecystokinin-stimulated amylase secretion was competitive, fully reversible, and specific for those secretagogues that interact with the cholecystokinin receptor. The potencies with which the various carbobenzoxy amino acids inhibited the action of cholecystokinin varied 100-fold and CBZ-cystine was the most potent cholecystokinin receptor antagonist. This variation in potency was primarily but not exclusively a function of the hydrophobicity of the amino acid side chain.

• Research Organization: National Institute of Arthritis, Bethesda, MD
• OSTI ID: 5483935
• Journal Information: Am. J. Physiol.; (United States), Journal Name: Am. J. Physiol.; (United States) Vol. 248; ISSN AJPHA
• Country of Publication: United States
• Language: English

Related Subjects

550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ALANINES
AMINO ACIDS
AMYLASE
ANIMALS
BIOCHEMICAL REACTION KINETICS
CARBOXYLIC ACIDS
CYSTINE
DISULFIDES
DRUGS
ENZYME ACTIVITY
ENZYMES
GLYCINE
GLYCOSYL HYDROLASES
GUINEA PIGS
HORMONE ANTAGONISTS
HORMONES
HYDROLASES
KINETICS
LYSINE
MAMMALS
O-GLYCOSYL HYDROLASES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PEPTIDES
POLYPEPTIDES
PROTEINS
REACTION KINETICS
RECEPTORS
RODENTS
STRUCTURE-ACTIVITY RELATIONSHIPS
VERTEBRATES