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Differential localization of rat Eag1 and Eag2 potassium channels in the retina.

Neurosci. Lett.2008 Jan 24;431(1):12-6. Epub 2007 Nov 17
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摘要


Despite of their wide expression in the brain, the precise neurophysiological role of rat Eag1 (rEag1) and Eag2 (rEag2) K(+) channels remains elusive. Our previous studies in hippocampal pyramidal neurons demonstrate a somatodendritic localization of rEag1 and rEag2 channels, suggesting that the two channel isoforms may contribute to setting the membrane excitability of somas and dendrites. Here, we aim to further characterize the cellular and subcellular localization patterns of rEag1 and rEag2 proteins by studying their laminar distribution in the retina. Confocal microscopic analyses of immunofluorescence data revealed that rEag1 and rEag2 K(+) channels exhibit distinct cellular expression pattern in the retina. rEag1 immunoreactivity was most prominent in the outer half of the inner plexiform layer, whereas strong rEag2 immunostain was found in the outer and inner segments of photoreceptor cells, the outer plexiform layer, and the inner nuclear layer. These results suggest that rEag1 and rEag2 K(+) channels may play a significant role in the transmission of electrical signals along the retinal neuronal circuits. We also performed double-labeling experiments to demonstrate that rEag1 and rEag2 are predominantly expressed in the somatodendritic compartment of retinal neurons. In addition, we presented evidence suggesting that rEag1 channels may be expressed in the GABAergic amacrine cell. Finally, based on their different immunostaining patterns over the inner region of the retina, we propose that compared to rEag2, rEag1 expression encompasses a significantly broader range of the somatodendritic compartment of the retinal ganglion cell.

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