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Development of fluorescence imaging probes for nicotinic acetylcholine α4β2 ∗ receptors.

Authors :
Samra GK
Intskirveli I
Govind AP
Liang C
Lazar R
Green WN
Metherate R
Mukherjee J
Source :
Bioorganic & medicinal chemistry letters [Bioorg Med Chem Lett] 2018 Feb 01; Vol. 28 (3), pp. 371-377. Date of Electronic Publication: 2017 Dec 17.
Publication Year :
2018

Abstract

Nicotinic acetylcholine α4β2 <superscript>∗</superscript> receptors (nAChRs) are implicated in various neurodegenerative diseases and smoking addiction. Imaging of brain high-affinity α4β2 <superscript>∗</superscript> nAChRs at the cellular and subcellular levels would greatly enhance our understanding of their functional role. Since better resolution could be achieved with fluorescent probes, using our previously developed positron emission tomography (PET) imaging agent [ <superscript>18</superscript> F]nifrolidine, we report here design, synthesis and evaluation of two fluorescent probes, nifrodansyl and nifrofam for imaging α4β2 <superscript>∗</superscript> nAChRs. The nifrodansyl and nifrofam exhibited nanomolar affinities for the α4β2 <superscript>∗</superscript> nAChRs in [ <superscript>3</superscript> H]cytisine-radiolabeled rat brain slices. Nifrofam labeling was observed in α4β2 <superscript>∗</superscript> nAChR-expressing HEK cells and was upregulated by nicotine exposure. Nifrofam co-labeled cell-surface α4β2 <superscript>∗</superscript> nAChRs, labeled with antibodies specific for a β2 subunit extracellular epitope indicating that nifrofam labels α4β2 <superscript>∗</superscript> nAChR high-affinity binding sites. Mouse brain slices exhibited discrete binding of nifrofam in the auditory cortex showing promise for examining cellular distribution of α4β2 <superscript>∗</superscript> nAChRs in brain regions.<br /> (Copyright © 2017 Elsevier Ltd. All rights reserved.)

Details

Language :
English
ISSN :
1464-3405
Volume :
28
Issue :
3
Database :
MEDLINE
Journal :
Bioorganic & medicinal chemistry letters
Publication Type :
Academic Journal
Accession number :
29277457
Full Text :
https://doi.org/10.1016/j.bmcl.2017.12.036