Nitric oxide increases in the rat retina after continuous illumination.
Continuous illumination (CI) of the retina induces an oxidative stress followed by the degeneration of photoreceptors. This phenomenon may be partially related to the excessive production of nitric oxide (NO). In order to confirm this hypothesis, the aims of this work are to determine NO levels during the illumination of the retina by electron paramagnetic resonance (EPR), and if an increase of NO is found, to characterize the NOS isoform responsible of the increment by using Western blot. Sprague-Dawley rats were continuously illuminated with white light (12,000 lux) for 2, 24, 48 h, 5 and 7 days while control rats were maintained at light/dark cycles of 12/12 h. Using EPR, an increase of NO signal was observed in the light exposed retinas peaking at 24 h of CI. Western blot analysis showed the expression of iNOS in the illuminated retinas with a peak after 24 h of CI, but did not show significant differences of nNOS among illuminated and control retinas. In summary, there is an increase of NO during CI. Further studies will reveal whether this mechanism is responsible for light induced photoreceptor degeneration.
Piehl
L
L
Cátedra de Física, Facultad de Farmacia y Bioquímica, UBA. Lanais RLBM, Argentina.
Capani
F
F
Facorro
G
G
López
E M
EM
de Celis
E Rubin
ER
Pustovrh
C
C
Hager
A
A
Coirini
H
H
López-Costa
J J
JJ
D000818:Animals; D004578:Electron Spin Resonance Spectroscopy; D015971:Gene Expression Regulation, Enzymologic / Q000528:radiation effects; D008027:Light; D009569:Nitric Oxide / Q000378:metabolism*; D052248:Nitric Oxide Synthase Type I / Q000235:genetics; D052247:Nitric Oxide Synthase Type II / Q000235:genetics / Q000528:radiation effects; D018384:Oxidative Stress / Q000528:radiation effects; D051381:Rats; D012016:Reference Values; D012160:Retina / Q000502:physiology* / Q000528:radiation effects
D009569:Nitric Oxide; D052248:Nitric Oxide Synthase Type I; D052247:Nitric Oxide Synthase Type II