2,6-Diisopropylphenol,a general anesthetic,inhibits glutamate action on rat synaptosomes

2,6-diisopropylphenol (propofol), a general intravenous anesthetic, inhibits the glutamate-dependent Ca²⁺ entry in rat synaptosomes with an approximate IC₅₀ of 3.0×10^–5 M.Propofol, at concentrations above 10^–6M, also inhibits the ATP-dependent uptake of glutamate in the presence of Ca²⁺, with an approximate IC₅₀ of 3.5×10^–5M, while it only has a slight inhibitory effect on the release of glutamate. The ouabain-insensitive synaptosomal ATPase is strongly inhibited by propofol, with an IC₅₀ of about 2.5×10^–6M, at concentrations which do not affect the luciferase system.