The Ameliorating Effects of Acute and Chronic Administration of LiuWei Dihuang Wang on Learning Performance in Rodents.

Hsieh Ming-Tsuen, Cheng Sung-Jen, Lin Li-Wei, Wang Wen-Hsin, Wu Chi-Rei

doi:10.1248/bpb.26.156

The ameliorating effects of LiuWei Dihuang Wang (LDW) after single, one-week or two-week treatment of scopolamine (SCOP)-induced and p-chloroamphetamine (PCA)-induced amnesia by using the passive avoidance task and the facilitatory effects on two-way active avoidance performance in rats were studied. LDW (2 g/kg) after single treatment significantly prolonged the shortened step-through latency induced by SCOP and PCA. Then, SCOP- and PCA-induced amnesia was reversed by 1 and 0.1—1 g/kg LDW with one-week consecutive treatment respectively. For two-week consecutive treatment with LDW, the reversal from SCOP- and PCA-induced amnesia required only 0.01 g/kg. However, the rats treated with LDW only at 0.5, but not 0.01—0.1 g/kg, before or after each training session showed an increasing number of avoidances and a decreasing number of escapes on days 2—5 of learning. LDW at any dose alone did not influence the step-through latency in the training trial produced by non-shock rats, the motor activity and pentobarbital-induced hypnosis in rodents. These results suggest that LDW possesses the anti-amnestic and cognitive-enhancing activities related to the memory processes, and these activities were parallel to treatment duration and dependent on the learning models.

The Ameliorating Effects of Acute and Chronic Administration of LiuWei Dihuang Wang on Learning Performance in Rodents.

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