Abstract:
:The abundance of nitric oxide (NO) synthesizing enzymes identified in the vertebrate retina highlight the importance of NO as a signaling molecule in this tissue. Here we describe opposing actions of NO on the rod and cone photoreceptor synapse. Depolarization-induced increases of calcium concentration in rods and cones were enhanced and inhibited, respectively, by the NO donor S-nitrosocysteine. NO suppressed calcium current in cones by decreasing the maximum conductance, whereas NO facilitated rod Ca channel activation. NO also activated a nonselective voltage-independent conductance in both rods and cones. Suppression of NO production in the intact retina with N(G)-nitro-l-arginine favored cone over rod driven postsynaptic signals, as would be expected if NO enhanced rod and suppressed cone synaptic activity. These findings may imply involvement of NO in regulating the strength of rod and cone pathways in the retina during different states of adaptation.
journal_name
J Neurophysioljournal_title
Journal of neurophysiologyauthors
Kourennyi DE,Liu XD,Hart J,Mahmud F,Baldridge WH,Barnes Sdoi
10.1152/jn.00606.2003subject
Has Abstractpub_date
2004-07-01 00:00:00pages
477-83issue
1eissn
0022-3077issn
1522-1598pii
00606.2003journal_volume
92pub_type
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