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Volume 17, Number 9,
Issue of May 1, 1997
pp. 3157-3167
Copyright ©1997 Society for Neuroscience
The 5-HT3 Receptor Is Present in Different
Subpopulations of GABAergic Neurons in the Rat Telencephalon
Received Oct. 1, 1996; revised Jan. 27, 1997; accepted Feb. 10, 1997.
Marisela Morales and
Floyd E. Bloom
The Scripps Research Institute, Department of Neuropharmacology, La
Jolla, California 92037
The type 3 serotonin receptor (5-HT3R) is a
ligand-gated ion channel whose presence in the CNS has been established
by radioligand binding, in situ hybridization, and
immunohistochemical analysis. To analyze further the role of the
5-HT3R in the CNS, we used in situ
hybridization and immunocytochemistry to determine that 5-HT3R-expressing neurons are mainly GABA-containing cells
in the rat telencephalon. We determined that
5-HT3R/GABA-containing neurons do not exhibit somatostatin
immunoreactivity but often contain cholecystokinin (CCK)
immunoreactivity. 5-HT3R-expressing cells with CCK
immunoreactivity were observed in the neocortex, olfactory cortex,
hippocampus, and amygdala. The 5-HT3R/CCK interneurons represent between 35 and 66% of the total population of CCK-containing cells in the neocortex.
Further characterization of the 5-HT3R/GABAergic neurons
was based on their calcium-binding protein immunoreactivity and showed that these neurons lack parvalbumin (PV) and represent a
subpopulation of calbindin (CB)-containing interneurons that were
preferentially present in the CA1-CA3 subfield of the hippocampus.
Although some 5-HT3R/GABAergic neurons with
calretinin (CR) were found in the neocortex, olfactory cortex,
hippocampus, and amygdala, these neurons were more often present in the
agranular insular and piriform cortices.
We conclude that the neuronal expression of the 5-HT3R is
selective within the GABA neuron population in the rat telencephalon. These 5-HT3R-expressing interneurons might contain CCK, CB,
and CR. We suggest that serotonin through the 5-HT3R may
regulate GABA and CCK neurotransmission in the telencephalon.
Key words:
5-HT3R;
serotonin;
GABA;
interneurons;
calcium-binding proteins;
cholecystokinin
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