Effect of Guibi-tang on Neuronal Apoptosis and Cognitive Impairment Induced by Beta Amyloid in Mice

다국어 초록 (Multilingual Abstract)

Objectives: This study evaluated the effects of Guibi-tang (GBT) on neuronal apoptosis and cognitive impairment induced by beta amyloid (Aβ), (1-42) injection in the hippocampus of ICR mice.
Methods: Aβ (1-42) was injected unilaterally into the lateral ventricle using a Hamilton syringe and micropump (2 ㎍/3 ㎕, 0.6 ㎕/min). Water extract of GBT was administered orally once a day (500 mg/kg) for 3 weeks after the Aβ (1-42) injection. Acquisition of learning and retention of memory were tested using the Morris water maze. Neuronal damage and Aβ accumulation in the hippocampus was observed using cresyl violet and Congo red staining. The anti-apoptotic effect of GBT was evaluated using TUNEL labeling in the hippocampus.
Results: GBT significantly shortened the escape latencies during acquisition training trials. GBT significantly increased the number of target headings to the platform site, the swimming time spent in the target quadrant, and significantly shortened the time for the 1st target heading during the retention test trial. GBT significantly attenuated the reduction in thickness and number of CA1 neurons, and Aβ accumulation in the hippocampus produced by Aβ (1-42) injection. GBT significantly reduced the number of TUNEL-labeled neurons in the hippocampus.
Conclusion: These results suggest that GBT improved cognitive impairment by reducing neuronal apoptosis and Aβ accumulation in the hippocampus. GBT may be a beneficial herbal formulation in treating cognitive impairment including Alzheimer’s disease.

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