Quantitative autoradiographic mapping of 5‐HT 3 receptors in the rat CNS using ( 125 I)iodo‐zacopride and ( 3 H)zacopride as radioligands

Quantitative autoradiographic mapping of 5‐HT 3 receptors in the rat CNS using ( 125... Substitution of the chlorine atom by a radio‐iodine in position 5 in the zacopride molecule yielded (125I)iodo‐zacopride that bound with high affinity (Kd = 4.3 nM) to 5‐HT3 receptors in the rat central nervous system. Assays with membranes from the posterior (mainly entorhinal) cortex confirmed that the pharmacolgical properties and regional distribution of (125I)iodo‐zacopride‐specific binding sites were identical with those of 5‐HT3 sites labelled by the reference radioligand (3H)zacopride. Autoradiographic investigations for the visualization and quantification of 5‐HT3 receptors yielded similar results with both radioligands, but autoradiograms could be obtained after only 1–3 days of exposure of sections labelled with (125I)iodo‐zacopride, instead of 4–6 months using (3H)zacopride. The highest density of 5‐HT3 sites was found in the nucleus tractus solitarius followed by, in decreasing order, the dorsal motor nucleus of the vagus nerve, the superficial layers of the dorsal horn in the spinal cord, the nucleus of the spinal tract of the trigeminal nerve, and the area postrema. Significant labelling of 5‐HT3 receptors was also observed in limbic areas (amygdala, hippocampus, frontal and entorhinal cortex), and to a much lower extent in the dorsal raphe nucleus, striatum, and substantia nigra. These multiple locations further support the idea that 5‐HT3 receptors are probably involved in several 5‐HT‐mediated functions in the central nervous system. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Synapse Wiley

Quantitative autoradiographic mapping of 5‐HT 3 receptors in the rat CNS using ( 125 I)iodo‐zacopride and ( 3 H)zacopride as radioligands

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Publisher
Wiley
Copyright
Copyright © 1992 Wiley‐Liss, Inc.
ISSN
0887-4476
eISSN
1098-2396
DOI
10.1002/syn.890100402
pmid
1585260
Publisher site
See Article on Publisher Site

Abstract

Substitution of the chlorine atom by a radio‐iodine in position 5 in the zacopride molecule yielded (125I)iodo‐zacopride that bound with high affinity (Kd = 4.3 nM) to 5‐HT3 receptors in the rat central nervous system. Assays with membranes from the posterior (mainly entorhinal) cortex confirmed that the pharmacolgical properties and regional distribution of (125I)iodo‐zacopride‐specific binding sites were identical with those of 5‐HT3 sites labelled by the reference radioligand (3H)zacopride. Autoradiographic investigations for the visualization and quantification of 5‐HT3 receptors yielded similar results with both radioligands, but autoradiograms could be obtained after only 1–3 days of exposure of sections labelled with (125I)iodo‐zacopride, instead of 4–6 months using (3H)zacopride. The highest density of 5‐HT3 sites was found in the nucleus tractus solitarius followed by, in decreasing order, the dorsal motor nucleus of the vagus nerve, the superficial layers of the dorsal horn in the spinal cord, the nucleus of the spinal tract of the trigeminal nerve, and the area postrema. Significant labelling of 5‐HT3 receptors was also observed in limbic areas (amygdala, hippocampus, frontal and entorhinal cortex), and to a much lower extent in the dorsal raphe nucleus, striatum, and substantia nigra. These multiple locations further support the idea that 5‐HT3 receptors are probably involved in several 5‐HT‐mediated functions in the central nervous system.

Journal

SynapseWiley

Published: Apr 1, 1992

References

  • ( 3 H)Zacopride: Ligand for the identification of 5‐HT 3 recognition sites
    Barnes, Barnes; Costall, Costall; Naylor, Naylor
  • Identification of 5‐HT 3 recognition sites in the ferret area postrema
    Barnes, Barnes; Costall, Costall; Naylor, Naylor; Tattersall, Tattersall
  • Zacopride: Anxiolytic profile in rodent and primate models of anxiety
    Costall, Costall; Domeney, Domeney; Gerrard, Gerrard; Kelly, Kelly; Naylor, Naylor
  • The attraction of proteins for small molecules and ions
    Scatchard, Scatchard
  • The emetic activity of centrally administered cisplatin in cats and its antagonism by zacopride
    Smith, Smith; Callaham, Callaham; Alphin, Alphin

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