Antagonist activity of methyl-substituted analogues of 2-amino-4-phosphonobutanoic acid in the hippocampal slice

Stephen L. Crooks, Ronald K. Freund, David A. Halsrud, James F. Koerner, Rodney L. Johnson

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Four monomethyl-substituted analogues of 2-amino-4-phosphonobutanoic acid (APB), an antagonist of excitatory pathways in the central nervous system, were prepared in order to investigate the steric requirements of the APB receptor. Methyl groups were incorporated at the amino, α-, β-, and γ-positions. The β- and γ-methyl-substituted analogues of APB were found to be moderately potent antagonists in excitatory synapses of the hippocampal perforant path, as judged by extracellular recording techniques, while the N- and α-methyl-substituted analogues had much lower potencies. All of these APB analogues had very low potencies in the Schaffer collateral pathway. The APB receptors in the perforant path displayed more tolerance of methyl-substitution at the β- and γ-positions of APB than at the amino or α-positions in this system.

Original languageEnglish (US)
Pages (from-to)346-349
Number of pages4
JournalBrain Research
Volume329
Issue number1-2
DOIs
StatePublished - Mar 11 1985

Bibliographical note

Funding Information:
This researchw as supportedb y NIH grant NS 17944.R .K.F. is a recipiento f NIH Training Grant 5T32-GM0732309R. .L.J. is a recipiento f NIH Re-searchC areerD evelopmenAtw ardHL00932.

Keywords

  • 2-amino-4-phosphonobutanoic acid (APB) analogues
  • antagonist
  • extracellular recording
  • glutamate analogues
  • methyl substitution
  • perforant path

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