Dopamine D1 receptor expression is bipolar cell type‐specific in the mouse retina |
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Authors: | David M. Krolewski Paul D. Walker Tomomi Ichinose |
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Affiliation: | 1. Molecular and Behavioral Neuroscience Institute, University of Michigan Medical School, Ann Arbor, Michigan, USA;2. Department of Anatomy and Cell Biology, Wayne State University School of Medicine, Detroit, Michigan, USA;3. Department of Ophthalmology, Wayne State University School of Medicine, Detroit, Michigan, USA |
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Abstract: | In the retina, dopamine is a key molecule for daytime vision. Dopamine is released by retinal dopaminergic amacrine cells and transmits signaling either by conventional synaptic or by volume transmission. By means of volume transmission, dopamine modulates all layers of retinal neurons; however, it is not well understood how dopamine modulates visual signaling pathways in bipolar cells. Here we analyzed Drd1a‐tdTomato BAC transgenic mice and found that the dopamine D1 receptor (D1R) is expressed in retinal bipolar cells in a type‐dependent manner. Strong tdTomato fluorescence was detected in the inner nuclear layer and localized to type 1, 3b, and 4 OFF bipolar cells and type 5‐2, XBC, 6, and 7 ON bipolar cells. In contrast, type 2, 3a, 5‐1, 9, and rod bipolar cells did not express Drd1a‐tdTomato. Other interneurons were also found to express tdTomato including horizontal cells and a subset (25%) of AII amacrine cells. Diverse visual processing pathways, such as color or motion‐coded pathways, are thought to be initiated in retinal bipolar cells. Our results indicate that dopamine sculpts bipolar cell performance in a type‐dependent manner to facilitate daytime vision. J. Comp. Neurol. 524:2059–2079, 2016. © 2015 Wiley Periodicals, Inc. |
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Keywords: | BAC transgenic mice immunohistochemistry in situ hybridization: RRID: AB_10000347 RRID: AB_2313634 RRID: AB_2079751 RRID: AB_2086774 RRID: AB_2094841 RRID: AB_2314280 RRID: AB_10013483 RRID: AB_94936 RRID: AB_2115181 RRID: AB_2248534 RRID: AB_2314947 RRID: AB_2158332 RRID: AB_397957 RRID: AB_628142 RRID: AB_2261205 RRID: AB_10013783 RRID: AB_2201528 |
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