Radiosynthesis and preliminary evaluation of 5-[123/125I]iodo-3-(2(S)-azetidinylmethoxy)pyridine: a radioligand for nicotinic acetylcholine receptors.

Published

Journal Article

The radiochemical syntheses of 5-[125I]iodo-3-(2(S)-azetidinylmethoxy)pyridine (5-[125I]-iodo-A-85380, [125I]1) and 5-[123I]-iodo-A-85380, [123I]1, were accomplished by radioiodination of 5-trimethylstannyl-3-((1-tert-butoxycarbonyl-2(S)-azetidinyl)metho xy)pyridine, 2, followed by acidic deprotection. Average radiochemical yields of [125I]1 and [123I]1 were 40-55%; and the average specific radioactivities were 1,700 and 7,000 mCi/mumol, respectively. Binding affinities of [125I]1 and [123I]1 in vitro (rat brain membranes) were each characterized by a Kd value of 11 pM. Preliminary in vivo assay and ex vivo autoradiography of mouse brain indicated that [125I]1 selectively labels nicotinic acetylcholine receptors (nAChRs) with very high affinity and specificity. These studies suggest that [123I]1 may be useful as a radioligand for single photon emission computed tomography (SPECT) imaging of nAChRs.

Full Text

Duke Authors

Cited Authors

  • Horti, AG; Koren, AO; Lee, KS; Mukhin, AG; Vaupel, DB; Kimes, AS; Stratton, M; London, ED

Published Date

  • February 1999

Published In

Volume / Issue

  • 26 / 2

Start / End Page

  • 175 - 182

PubMed ID

  • 10100216

Pubmed Central ID

  • 10100216

International Standard Serial Number (ISSN)

  • 0969-8051

Digital Object Identifier (DOI)

  • 10.1016/s0969-8051(98)00086-9

Language

  • eng

Conference Location

  • United States