GABA and GABA-transporter (GAT-1) immunoreactivities in the retina of the salmon (Salmo salar L.).
Putative GABAergic elements in the retina of the Atlantic salmon have been identified by immunohistochemistry, utilising polyclonal antisera against gamma-aminobutyric acid (GABA) and the GABA transporter GAT-1. Cell types immunoreactive (ir) for GABA comprise horizontal cells, amacrine cells, displaced amacrine cells in the ganglion cell layer, displaced amacrine cells in the inner plexiform layer (interstitial cells), and Müller cells. In addition, a GABA-immunonegative type of interstitial cell was also identified. In the inner plexiform layer, GABAir fibres were organised in sublayers that were strikingly similar to the sublayering of GAT-1ir fibres. GAT-1ir cell bodies comprise amacrine cells and displaced amacrine cells that may represent a subpopulation of the GABAir ones. In view of the very similar sublayering of GABAir and GAT-ir fibres in the IPL we suggest that a similar type of GABA transporter, that can be recognised with antibodies against rat GAT-1, is present at least in the dendrites of all GABAir amacrine cells but is not expressed in the cell bodies of all GABAir cells.
Ekström
P
P
Department of Zoology, Lund University, Helgonavägen 3, S-223 62, Lund, Sweden. peter.ekstrom@zoo1.lu.se
Anzelius
M
M
D000818:Animals; D002352:Carrier Proteins / Q000032:analysis*; D050485:GABA Plasma Membrane Transport Proteins; D007150:Immunohistochemistry; D008565:Membrane Proteins / Q000032:analysis*; D026901:Membrane Transport Proteins; D009419:Nerve Tissue Proteins / Q000032:analysis*; D027361:Organic Anion Transporters; D012160:Retina / Q000737:chemistry*; D020317:Salmo salar / Q000378:metabolism*; D005680:gamma-Aminobutyric Acid / Q000032:analysis* / Q000378:metabolism*
D002352:Carrier Proteins; D050485:GABA Plasma Membrane Transport Proteins; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; D009419:Nerve Tissue Proteins; D027361:Organic Anion Transporters; C493415:Slc6a1 protein, rat; D005680:gamma-Aminobutyric Acid