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NADPH‐diaphorase distribution in the rabbit superior colliculus and co‐localization with calcium‐binding proteins
Author(s) -
GonzálezSoriano Juncal,
ContrerasRodríguez Julio,
MartínezSainz Pilar,
MartínPalacios Susana,
MarínGarcía Pilar,
RodríguezVeiga Elisia
Publication year - 2002
Publication title -
journal of anatomy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.932
H-Index - 118
eISSN - 1469-7580
pISSN - 0021-8782
DOI - 10.1046/j.1469-7580.2002.00025.x
Subject(s) - parvalbumin , calbindin , nadph dehydrogenase , nicotinamide adenine dinucleotide phosphate , diaphorase , nitric oxide synthase , nicotinamide adenine dinucleotide , superior colliculus , biophysics , nitric oxide , calcium binding protein , microbiology and biotechnology , biology , chemistry , calcium , biochemistry , anatomy , enzyme , neuroscience , nad+ kinase , endocrinology , organic chemistry , oxidase test
Nitric oxide (NO) and calcium‐binding proteins (CaBP) are important neuromodulators implicated in brain plasticity and brain disease. In addition, the mammalian superior colliculus (SC) has one of the highest concentrations of NO within the brain. The present study was designed to determine the distribution of nitric oxide‐synthesizing neurons in the SC of the rabbit by enzyme histochemistry for reduced nicotinamide adenine dinucleotide phosphate‐diaphorase (NADPH‐d), and its degree of co‐localization with CaBP, parvalbumin (PV) and calbindin (CB). NADPH‐d‐labelled fibres formed dense patches of terminal buttons within the intermediate grey layer and streams of fibres within the deepest layers of SC. Cells expressing NOS constitute a subpopulation of neurons in which practically all cell types are represented. Combined PV/NADPH‐d experiments showed a complete lack of co‐localization within individual neurons and fibres. On the contrary, double‐labelled neurons appeared in CB/NADPH‐d‐stained sections, only in the superficial layers, and mostly in the SGS and SO. These cells, which were intermingled with other neurons containing either NADPH‐d or CB, appear to be a subtype of narrow‐field and wide‐field vertical cells, and display an anterior–posterior gradient of density. Owing to the involvement of the superficial layers of the SC in the organization and integration of the visual information, it is suggested that these neurons may play a concrete role within the visual circuits. Our data indicate a clear selectivity in the expression of NADPH‐d, PV and CB in the SC, and that NO and CB probably serve as co‐modulators and/or co‐transmitters in the connectivity of the superficial layers of this midbrain structure.