Effects of nitric oxide on normal and ischemic cochlea of the guinea pig

Experimental Neurology
R S RuanK H Yeoh

Abstract

To determine whether nitric oxide (NO)/peroxynitrite plays any role in neurodestruction observed in ischemic cochlea of the guinea pig, the effects of NO donors like S-nitrosocysteine (S-NC) and nitroglycerin (NTG), peroxynitrite generators like 3-morpholinosydnonimine (SIN-1), peroxynitrite inhibitors like superoxide dismutase plus catalase (SOD/Cat), as well as NOS inhibitors like N(G)-nitro-l-arginine methyl ether (L-NAME), were tested on normal and ischemic cochleae. Various concentrations of S-NC and SIN-1 were introduced into the perilymphatic space of normal guinea pig cochlea. Quantitative scanning electron microscopy of inner and outer hair cells was carried out 2 days later. To determine the level of NO in the cochlea after 20 to 120 min of ischemia, nitrites/nitrates in the perilymph were measured. The effects of NO on the ischemic cochlea were tested by infusion of SOD/Cat, L-NAME, S-NC, and NTG into the perilymphatic space just before decapitation. Introduction of fixative into the cochlea was delayed for 15 min to investigate the effects of the chemicals on nerve endings at the base of inner hair cells. The results showed that the level of nitrites/nitrates tended to decline with increasing time of ischemia. There...Continue Reading

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Citations

Jun 5, 2012·Nitric Oxide : Biology and Chemistry·Ulf-Rüdiger Heinrich, Kai Helling
Jun 22, 2002·Annals of the New York Academy of Sciences·Run-Sheng Ruan
May 25, 2013·Acta Cirúrgica Brasileira·Fernando Kaoru YonamineOswaldo Laércio Mendonça Cruz
Jan 2, 2003·The Journal of Comparative Neurology·Kenichiro KogaKiyofumi Gyo
Oct 13, 2006·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Cláudio Márcio Yudi IkinoNewton Macuco Capella
Jan 18, 2006·Journal of Speech, Language, and Hearing Research : JSLHR·James A HenryMartin A Schechter

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