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Using a repeated acquisition procedure in a 3-panel runway apparatus, the effect of WEB 1881 FU on impairment of working memory produced either by scopolamine or by cerebral ischemia was investigated in rats and compared with those of aniracetam and Ca hopantenate. Intraperitoneal injection of scopolamine at 0.56 mg/kg significantly increased the number of errors (pushes made on the two incorrect panels of the three panel-gates located at each choice point). WEB 1881 FU at 10-32 mg/kg, p.o., caused a dose-related reduction in the increase of errors expected in the scopolamine-treated rats. Aniracetam at 10-100 mg/kg, p.o., or Ca hopantenate at 100 and 560 mg/kg, p.o., also significantly diminished the increase in errors induced by 0.56 mg/kg of scopolamine. Cerebral ischemia for 5 min significantly increased errors in the 3-panel runway task. WEB 1881 FU at 32 and 56 mg/kg, administered p.o. immediately after blood flow recirculation and again 1 hr before the runway test, conducted 24 hr after ischemia, significantly reduced the increase in errors expected to occur after 5 min of ischemia. Aniracetam at 32 and 100 mg/kg, p.o., similarly diminished the increase in errors in ischemic rats. These findings suggest that WEB 1881 FU has a beneficial effect on memory that has been impaired by scopolamine or by cerebral ischemia.

WEB 1881 FU Ameliorates Impairment of Working Memory Induced by Scopolamine and Cerebral Ischemia in the Three-Panel Runway Task