Linked Life Data

2859375

Source:http://linkedlifedata.com/resource/pubmed/id/2859375

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1985-6-3
pubmed:abstractText
The syntheses of (RS)-alpha-amino-3-hydroxy-5-tert-butyl-4-isoxazolepropionic acid (9, ATPA), (alpha-RS, beta-RS)-alpha-amino-beta-methyl-3-hydroxy-5-isoxazolepropionic acid (8), (RS)-alpha-amino-3-hydroxy-5-isoxazolebutyric acid (15a), and (RS)-alpha-amino-3-hydroxy-5-isoxazolevaleric acid (15b) are described. The compounds were tested in vitro together with (RS)-alpha-amino-3-hydroxy-5-(bromomethyl)-4-isoxazolepropionic acid (ABPA) as inhibitors of the binding of radioactive-labeled (RS)-alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) to rat brain synaptic membranes. These data were compared with the earlier reported effects of the compounds on single neurons in the feline spinal cord obtained by microelectrophoretic techniques. The three compounds AMPA, ATPA, and ABPA are agonists at the class of receptors assumed to represent a subtype of physiological (S)-glutamic acid (Glu) receptors. Inhibition of [3H]AMPA binding by ATPA was 1 order of magnitude weaker than that of AMPA, in agreement with the relative potency of these compounds in vivo. ABPA proved to be equipotent with AMPA both as an inhibitor of AMPA binding and as a neuronal excitant. The compounds 8, 15a, and 15b have no effect as inhibitors of AMPA binding, in agreement with in vivo studies that have shown that 8 does not affect the firing of central neurons whereas 15a and 15b are antagonists at NMDA receptors, a subpopulation of excitatory receptors not affected by AMPA. Molecular mechanical calculations on AMPA, ATPA, and ABPA using the program MM2 showed that conformations of AMPA, ABPA, and especially ATPA by rotation of the amino acid side chain have energy barriers. A possible receptor-active conformation is suggested.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0022-2623
pubmed:author
pubmed:issnType
Print
pubmed:volume
28
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
668-72
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed-meshheading:2859375-Amino Acids, pubmed-meshheading:2859375-Animals, pubmed-meshheading:2859375-Brain, pubmed-meshheading:2859375-Cats, pubmed-meshheading:2859375-Electrophoresis, pubmed-meshheading:2859375-Ibotenic Acid, pubmed-meshheading:2859375-Molecular Conformation, pubmed-meshheading:2859375-Neurons, pubmed-meshheading:2859375-Oxazoles, pubmed-meshheading:2859375-Quantum Theory, pubmed-meshheading:2859375-Rats, pubmed-meshheading:2859375-Receptors, AMPA, pubmed-meshheading:2859375-Receptors, Drug, pubmed-meshheading:2859375-Receptors, Glutamate, pubmed-meshheading:2859375-Receptors, N-Methyl-D-Aspartate, pubmed-meshheading:2859375-Receptors, Neurotransmitter, pubmed-meshheading:2859375-Spinal Cord, pubmed-meshheading:2859375-Structure-Activity Relationship, pubmed-meshheading:2859375-Synaptic Membranes, pubmed-meshheading:2859375-alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid
pubmed:year
1985
pubmed:articleTitle
Ibotenic acid analogues. Synthesis, molecular flexibility, and in vitro activity of agonists and antagonists at central glutamic acid receptors.
pubmed:publicationType
Journal Article, In Vitro