Endogenous nitric oxide enhances the light-response of cones during light-adaptation in the rat retina

作者：Sato Masaki; Ohtsuka Teruya^*; Stell William K

来源：Vision Research, 2011, 51(1): 131-137.

DOI：10.1016/j.visres.2010.10.011

• CPTIO
• Electroretinogram
• Cone photoreceptor
• Rat
• Light-adaptation

The electroretinogram (ERG) is a non-invasive indicator of retinal function. Light flashes evoke a cornea-negative a-wave followed by a cornea-positive b-wave. Light-adaptation is known to increase the amplitude of cone-dependent b-waves. To identify the underlying mechanism, we recorded rat cone photoresponses in situ, using intravitreally-injected glutamate to block synaptic transmission and intense paired-flash stimuli to isolate cone a-waves. Steady adapting illumination caused a progressive increase in cone a-wave amplitude, which was suppressed in a dose-dependent manner by intravitreal CPTIO, a nitric oxide scavenger. We conclude that light-adaptation causes release of nitric oxide, which enhances the cone photoresponse.

• 出版日期2011-1