Cited by 67Radiopharmaceutical Chemistry and ApplicationsNicotinic Acetylcholine Receptors StudyChemical Reactions and Isotopes

Synthesis of an I-123 analog of A-85380 and preliminary SPECT imaging of nicotinic receptors in baboon

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Musachio, John L., Villemagne, Victor L., Scheffel, Ursula A., Dannals, Robert F., Dogan, A.Semih, Yokoi, Fuji, Wong, Dean F.·1999·Nuclear Medicine and Biology

Abstract

A radiosynthetic method to prepare the nicotinic acetylcholine receptor radioligand (S)-5-[123I]iodo-3-(2-azetidinylmethoxy)pyridine, 5-IA, has been developed. The two-step sequence produced [123I]-5-IA in high radiochemical yield (52%), high radiochemical purity (98%), and high specific radioactivities (> 8,500 mCi/mumol). Preliminary single photon emission computed tomography studies with [123I]-5-IA in baboon demonstrated the appropriate regional localization for a high-affinity nicotinic radioprobe (thalamus > frontal cortex > cerebellum). Pretreatment with cytisine blocked [123I]-5-IA uptake in all brain regions (78-59% reduction), demonstrating the specificity of the radiotracer.

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Crossref · 10.1016/s0969-8051(98)00101-2

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  • [123I]5-IA is a radioligand that has specificity for the agonist binding site on β2*-nAChRs.

    “With the recent development of [ 123 I]5-IA-85380 ([ 123 I]5-IA), a radioligand that has specificity for the agonist binding site on ␤ 2 *- nAChRs (Musachio et al., 1998(Musachio et al., , 1999;;Horti et al., 1999)”

    From Human Tobacco Smokers in Early Abstinence Have Higher Levels of β<sub>2</sub>* Nicotinic Acetylcholine Receptors than Nonsmokers (2006) · cites this paper as Musachio et al., 1999

    The Discussion (page not provided) describes [123I]5-IA as a highly specific probe for central nAChRs and reports that the agonist cytisine blocked its uptake in baboon brain. It does not establish specificity for the agonist binding site on β2*-nAChRs; it says only that radioiodinated 5-IA might be more selective for the α4β2 subtype. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • The recent development and use of [123I]5-I-A as a SPECT radioligand allows unparalleled access to β2*-nAChRs in vivo in the human brain.

    “The recent development and use of [123I]5-I-A ([123I]-5-iodo-3-[2(S)-2-azetidinylmethoxy] pyridine) as a SPECT radioligand to quantify β2*-nAChRs in vivo in the human brain now allows unparalleled access to this system in vivo (23–25).”

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Authors
Musachio, J. L., Villemagne, V. L., Scheffel, U. A., Dannals, R. F., Dogan, A. S., Yokoi, F., & Wong, D. F.
Affiliations
Johns Hopkins University (US)
Corresponding author
Musachio, John L.
Venue
Nuclear Medicine and Biology
Publisher
Elsevier BV
Published
1999-02
Volume
26
Issue
2
Pages
201-207
ISSN
0969-8051 (ISSN-L)
OpenAlex
W2072961809
Cited by
67
References
29
Citations by year
2019: 1 · 2018: 2 · 2015: 1 · 2014: 1 · 2013: 2 · 2012: 4
FWCI
5.76
Type
journal article
Language
en
Open access
Locations
  • Nuclear Medicine and Biology (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
  • National Cancer Institute (CA 77349, HD 24448)
  • U.S. Public Health Service
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Radiopharmaceutical Chemistry and Applications
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmaceutical Science › Chemical Reactions and Isotopes
Keywords
nicotinic acetylcholine receptors, radioligand synthesis, iodine-123, SPECT imaging, baboons, cytisine, thalamus, frontal cortex, cerebellum
MeSH terms
Animals, Azetidines, Brain, Iodine Radioisotopes, Male, Papio, Radiochemistry, Radioligand Assay, Receptors, Nicotinic, Molecular Structure, Tomography, Emission-Computed, Single-Photon, Rats, Sprague-Dawley, Rats

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