Immunohistochemical localization of AMPA-type glutamate receptor subunits in the nucleus of the Edinger-Westphal in embryonic chick

Autor(es)

Toledo, Claudio A. B. ^[1] ; Reiner, Anton ^{[2, 3]} ; Patel, Reena S. ^[4] ; Vitale, Adriane W. ^[4] ; Klein, Jordan M. ^[4] ; Dalsania, Bob J. ^[4] ; Fitzgerald, Malinda E. C. ^{[2, 3, 4]}

Afiliação do(s) autor(es)

^[1] Univ Cidade Sao Paulo, Nucleo Pesquisa Neurociencias, BR-03071000 Sao Paulo - Brazil

^[2] Univ Tennessee, Hlth Sci Ctr, Dept Anat & Neurobiol, Memphis, TN 38163 - USA

^[3] Univ Tennessee, Hlth Sci Ctr, Dept Ophthalmol, Memphis, TN 38163 - USA

^[4] Christian Bros Univ, Dept Biol, Memphis, TN 38104 - USA

• Tipo de documento: Artigo Científico
• Fonte: Neuroscience Letters; v. 498, n. 3, p. 199-203, JUL 12 2011.
• Citações Web of Science: 0

Resumo

The Edinger-Westphal nucleus (EW) in birds is responsible for the control of pupil constriction, accommodation, and choroidal blood flow. The activation of EW neurons is mediated by the neurotransmitter glutamate, in large part through AMPA-type glutamate receptors (GluRs), whose behavior varies according to the subunit composition. We investigated the developmental expression of the GluR subunits in EW of the chick (Gallus gallus) using immunohistochemistry on tissue from embryonic days 10 through 20 (E10-E20). Of the three antibodies used, one recognized the GluR1 subunit, another the GluR4 subunit, and the third recognized a sequence common to GluR2 and GluR3 subunits. No immunolabeling of EW neurons for any GluR subunits was observed prior to E12, although immunolabeling was seen in somatic oculomotor prior to E12. At E12, immunoreactivity for each of the three antibodies was in only approximately 2% of EW neurons. By E14, the abundance of GluR1+ perikarya in EW had increased to 13%, and for GluR2/3 had increased to 48%. The perikaryal abundance of the immunoreactivity for GluR1 and GluR2/3 declined to 3% and 23%, respectively, by E16. At E14, 33% of EW neurons immunolabeled for GluR4, and their frequency increased to 43% by E16, and remained at that approximate percentage through hatching. The increased expression of GluR1 and GluR4 in EW at E14 coincides with the reported onset of the expression of the calcium-binding protein parvalbumin, and the calcium currents associated with AMPA receptors formed by these two subunits may play a role in the occurrence of parvalbumin expression. (C) 2011 Published by Elsevier Ireland Ltd. (AU)

• Processo FAPESP: 08/51110-2 - Aspectos funcionais dos receptores ionotropicos de glutamato no sistema nervoso de vertebrados.
• Beneficiário: Sandra Regina Mota Ortiz
• Modalidade de apoio: Auxílio à Pesquisa - Regular