Synthesis of an I-123 analog of A-85380 and preliminary SPECT imaging of nicotinic receptors in baboon
Open accessAbstract
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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[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 measuredThe 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).”
From Persistent β <sub>2</sub> *-Nicotinic Acetylcholinergic Receptor Dysfunction in Major Depressive Disorder (2012) · cites this paper as [23]
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“With the recent development of [ 123I]5-IA-85380 ([ 123I]5-IA), a radioligand that has specificity for the agonist binding site on 2*- nAChRs (Musachio et al., 1998, 1999; Horti et al., 1999), it is now possible to measure this site in living smokers during acute abstinence from smoking and to…”
5-Iodo-A-85380, an α4β2 Subtype-Selective Ligand for Nicotinic Acetylcholine Receptors
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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
- hybrid
- doi.org
- Licence
- 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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