Cortical application of crystalline KCl in male cats anaesthetised with α -chloralose induced four transient negative deflections in cortical direct current (d.c.) potential. In vehicle treated animals d.c. shifts were associated with a hyperaemia and a multiphasic nitric oxide (NO) release. In these animals, the first negative shift in d.c. potential produced a significantly larger NO electrode current, when compared to subsequent cortical depolarisations. However, regional cerebrovascular laser Doppler flux (rCBF LDF ) increases were similar for each event. In l - N G -nitro- l -arginine ( l -NAME; 10 mg/kg i.v. infused over 30 min) treated animals, d.c. shifts were also associated with NO release following a multiphasic waveform and increase in rCBF LDF , but were significantly attenuated when compared to controls.
Neuroscience Letters – Elsevier
Published: Sep 5, 1997
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