Localization and developmental expression of GABAB receptors in the rat olfactory bulb |
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Authors: | Panzanelli Patrizia López-Bendito Guillermina Luján Rafael Sassoé-Pognetto Marco |
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Affiliation: | 1. Department of Anatomy, Pharmacology and Forensic Medicine, University of Turin, C.so Massimo d'Azeglio 52, 10126, Turin, Italy 3. Department of Human Anatomy and Genetics, University of Oxford, Oxford, OX1 3QX, UK 4. Centro Regional de Investigaciones Biomédicas, Facultad de Medicina, Universidad de Castilla-La Mancha, Campus Biosanitario, 02071, Albacete, Spain 2. Rita Levi Montacini Center for Brain Repair, University of Turin, C.so Massimo d'Azeglio 52, 10126, Turin, Italy
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Abstract: | In this study, we investigated the distribution and developmental expression of the GABAB receptor subunits, GABAB1 and GABAB2, in the main and accessory olfactory bulbs of the rat. Antibodies raised against these subunits strongly labelled the glomerular layer, suggesting that olfactory and vomeronasal nerve fibers express functional GABAB receptors. Using postembedding immunogold cytochemistry, we found that GABAB receptors can be present at both extrasynaptic and presynaptic sites of olfactory nerve terminals, and in the latter case they are preferentially associated with the peripheral part of the synaptic specialization. Olfactory nerve fibers expressed GABAB1 and GABAB2 at early developmental stages, suggesting that GABAB receptors may play a role in olfactory development. Output and local neurons of the main and accessory olfactory bulbs were also labelled for GABAB1 and GABAB2, although the subcellular distribution patterns of the two subunits were not completely overlapping. These results indicate that presynaptically located GABAB receptors modulate neurotransmitter release from olfactory and vomeronasal nerve fibers and that, in addition to this presynaptic role, GABAB receptors may regulate neuronal excitability in infraglomerular circuits. |
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