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Co-localisation of markers for glycinergic and GABAergic neurones in rat nucleus of the solitary tract: implications for co-transmission.
J Chem Neuroanat. 2010 Oct; 40(2):160-76.JC

Abstract

Immunoreactive structures visualised with antibodies to glycine were prominent in areas of the nucleus of the solitary tract (NTS) surrounding the tractus solitarius, but scarcer in medial and ventral areas of the nucleus. This contrasted with a higher density, more homogenous distribution of structures labelled for gamma-aminobutyric acid (GABA). Immunolabelling of adjacent semi-thin sections nonetheless indicated a close correspondence between cells and puncta labelled by glycine and GABA antisera in certain NTS areas. With post-embedding electron microscopic immunolabelling, synaptic terminals with high, presumed transmitter levels of glycine were discriminated from terminals containing low, metabolic levels by quantitative analysis of gold particle labelling densities. In a random sample of terminals, 28.5% qualified on this basis as glycinergic (compared to 44.4% GABAergic); these glycinergic terminals targeted mainly dendritic structures and contained pleomorphic vesicles and symmetrical synapses. Serial section analysis revealed few terminals (5.2%) immunoreactive for glycine alone, with 82% of glycinergic terminals also containing high levels of GABA immunoreactivity. No evidence for co-localisation of glycine and glutamate was found. Light, confocal and electron microscopic labelling with antibodies to proteins specific for glycine and GABA synthesis, release and uptake confirmed that glycinergic terminals also containing GABA are found predominantly in more lateral areas of NTS, despite glycine receptors and the 'glial' glycine transporter (GLYT1) being expressed throughout all areas of the nucleus. The data suggest that synaptic terminals in certain functionally distinct areas of NTS co-release both inhibitory amino acids, which may account for the previously reported differential inhibitory effects of glycine and GABA on NTS neurones.

Authors+Show Affiliations

Division of Cardiovascular & Neuronal Remodelling, LIGHT Institute, School of Medicine, University of Leeds, Leeds LS2 9JT, United Kingdom. t.f.c.batten@leeds.ac.ukNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20434539

Citation

Batten, Trevor F C., et al. "Co-localisation of Markers for Glycinergic and GABAergic Neurones in Rat Nucleus of the Solitary Tract: Implications for Co-transmission." Journal of Chemical Neuroanatomy, vol. 40, no. 2, 2010, pp. 160-76.
Batten TF, Pow DV, Saha S. Co-localisation of markers for glycinergic and GABAergic neurones in rat nucleus of the solitary tract: implications for co-transmission. J Chem Neuroanat. 2010;40(2):160-76.
Batten, T. F., Pow, D. V., & Saha, S. (2010). Co-localisation of markers for glycinergic and GABAergic neurones in rat nucleus of the solitary tract: implications for co-transmission. Journal of Chemical Neuroanatomy, 40(2), 160-76. https://doi.org/10.1016/j.jchemneu.2010.04.001
Batten TF, Pow DV, Saha S. Co-localisation of Markers for Glycinergic and GABAergic Neurones in Rat Nucleus of the Solitary Tract: Implications for Co-transmission. J Chem Neuroanat. 2010;40(2):160-76. PubMed PMID: 20434539.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Co-localisation of markers for glycinergic and GABAergic neurones in rat nucleus of the solitary tract: implications for co-transmission. AU - Batten,Trevor F C, AU - Pow,David V, AU - Saha,Sikha, Y1 - 2010/04/29/ PY - 2010/03/25/received PY - 2010/04/21/revised PY - 2010/04/22/accepted PY - 2010/5/4/entrez PY - 2010/5/4/pubmed PY - 2010/10/26/medline SP - 160 EP - 76 JF - Journal of chemical neuroanatomy JO - J. Chem. Neuroanat. VL - 40 IS - 2 N2 - Immunoreactive structures visualised with antibodies to glycine were prominent in areas of the nucleus of the solitary tract (NTS) surrounding the tractus solitarius, but scarcer in medial and ventral areas of the nucleus. This contrasted with a higher density, more homogenous distribution of structures labelled for gamma-aminobutyric acid (GABA). Immunolabelling of adjacent semi-thin sections nonetheless indicated a close correspondence between cells and puncta labelled by glycine and GABA antisera in certain NTS areas. With post-embedding electron microscopic immunolabelling, synaptic terminals with high, presumed transmitter levels of glycine were discriminated from terminals containing low, metabolic levels by quantitative analysis of gold particle labelling densities. In a random sample of terminals, 28.5% qualified on this basis as glycinergic (compared to 44.4% GABAergic); these glycinergic terminals targeted mainly dendritic structures and contained pleomorphic vesicles and symmetrical synapses. Serial section analysis revealed few terminals (5.2%) immunoreactive for glycine alone, with 82% of glycinergic terminals also containing high levels of GABA immunoreactivity. No evidence for co-localisation of glycine and glutamate was found. Light, confocal and electron microscopic labelling with antibodies to proteins specific for glycine and GABA synthesis, release and uptake confirmed that glycinergic terminals also containing GABA are found predominantly in more lateral areas of NTS, despite glycine receptors and the 'glial' glycine transporter (GLYT1) being expressed throughout all areas of the nucleus. The data suggest that synaptic terminals in certain functionally distinct areas of NTS co-release both inhibitory amino acids, which may account for the previously reported differential inhibitory effects of glycine and GABA on NTS neurones. SN - 1873-6300 UR - https://www.unboundmedicine.com/medline/citation/20434539/Co_localisation_of_markers_for_glycinergic_and_GABAergic_neurones_in_rat_nucleus_of_the_solitary_tract:_implications_for_co_transmission_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0891-0618(10)00055-4 DB - PRIME DP - Unbound Medicine ER -