In vivo studies with [125I]5-I-A-85380, a nicotinic acetylcholine receptor radioligand.

Published

Journal Article

5-[125I]iodo-3-(2(S)-azetidinylmethoxy)pyridine ([125I]5-I-A-85380) was evaluated in the mouse as a potential in vivo imaging ligand for central nicotinic acetylcholine receptors (nAChRs). After i.v. administration of [125I]5-I-A-85380, peak brain levels of radioactivity were measured within 1 h and declined slowly over 4 h. [125I]5-I-A-85380 binding was saturable, and both its pharmacology, based upon inhibition studies, and its pattern of accumulation in brain regions having high nAChR densities were consistent with an interaction at alpha4beta2 nAChR agonist binding sites. The thalamus:cerebellum radioactivity ratio, a measure of specific labeling, reached 37. Therefore, radiolabeled 5-I-A-85380 has excellent potential as an imaging radiotracer for nAChRs, particularly with single photon emission computed tomography, when 123I is incorporated into the molecule.

Full Text

Duke Authors

Cited Authors

  • Vaupel, DB; Mukhin, AG; Kimes, AS; Horti, AG; Koren, AO; London, ED

Published Date

  • July 13, 1998

Published In

Volume / Issue

  • 9 / 10

Start / End Page

  • 2311 - 2317

PubMed ID

  • 9694220

Pubmed Central ID

  • 9694220

International Standard Serial Number (ISSN)

  • 0959-4965

Digital Object Identifier (DOI)

  • 10.1097/00001756-199807130-00030

Language

  • eng

Conference Location

  • England