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http://dx.doi.org/10.5352/JLS.2010.20.1.001

Retrograde Tracer Studies of Tecto-Reticulospinal Pathway and Dorsal Lateral Geniculate Nucleus on GluR1- and GluR4-Immunoreactive Neurons in the Hamster Superior Colliculus

Choi, Jae-Sik (Department of Biology, College of Natural Sciences, Kyungpook National University)
Lee, Jea-Young (Department of Biology, College of Natural Sciences, Kyungpook National University)
Jang, Yu-Jin (Department of Biology, College of Natural Sciences, Kyungpook National University)
Lee, Eun-Shil (Department of Biology, College of Natural Sciences, Kyungpook National University)
Jeon, Chang-Jin (Department of Biology, College of Natural Sciences, Kyungpook National University)

Publication Information

Journal of Life Science / v.20, no.1, 2010 , pp. 1-8 More about this Journal

Abstract

We recently reported the distributions of AMPA ( $\alpha$ -amino-3-hydroxyl-5-methyl-4-isoxazole-propionate) receptor subtypes glutamate receptors (GluR) 1 and GluR4 in the superior colliculi (SC) of hamsters with antibody immunocytochemistry and the effect of enucleation on these distributions. We also compared these labelings to those of calcium-binding proteins calbindin D28K, calretinin, parvalbumin, and GABA. In the present study, we investigated whether the GluR1- and GluR4-immunoreactive (IR) neurons are interneurons or projection neurons by injection of the retrograde tracer horseradish peroxidase (HRP) into one of each major ascending and descending pathways of the SC. HRP injections were made into a tecto-reticulospinal pathway (TRS) and dorsal lateral geniculate nucleus (dLGN). Animals were then allowed to recover and to survive for 48 hr before perfusion. Sections containing retrograde-labeled neurons were then treated for GluR-immunoreactivity. HRP injections proved that only a small population of the GluR1-IR cells project into TRS (1.4%) and dLGN (2.6%). However, a large subpopulation of GluR4-IR cells project into TRS (32.7%). The differential compositions of inter/projection neurons, along with our previous studies on the separate distribution of the GluR subunits, its differential co-localization with calcium-binding proteins and GABA, and differential reactions to enucleations, strongly imply the functional variety of the receptor subunits in visual behavior responses.

Keywords

AMPA glutamate receptors; retrograde tracer; localization; tecto-reticulospinal pathway; dorsal lateral geniculate nucleus;

Citations & Related Records

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