Chinese Journal of Tissue Engineering Research ›› 2023, Vol. 27 ›› Issue (28): 4487-4493.doi: 10.12307/2023.556

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Effect of ginsenoside Rg1 on learning and memory ability of brain aging mice induced by D-galactose

Yang Yazhu1, 2, Du Juan3, Qu Haifeng1, Li Jianmin1, 2, Zhang Yuxin3, Liu Junjie1, 2   

  1. 1Department of Clinical Medicine, 3Department of Basic Medicine, North China University of Science and Technology, Tangshan 063000, Hebei Province, China; 2Department of Neurosurgery, Affiliated Hospital of North China University of Science and Technology, Tangshan 063000, Hebei Province, China
  • Received:2022-06-23 Accepted:2022-08-08 Online:2023-10-08 Published:2023-01-29
  • Contact: Liu Junjie, Master, Lecturer, Attending physician, Department of Clinical Medicine, North China University of Science and Technology, Tangshan 063000, Hebei Province, China; Department of Neurosurgery, Affiliated Hospital of North China University of Science and Technology, Tangshan 063000, Hebei Province, China
  • About author:Yang Yazhu, Department of Clinical Medicine, North China University of Science and Technology, Tangshan 063000, Hebei Province, China; Department of Neurosurgery, Affiliated Hospital of North China University of Science and Technology, Tangshan 063000, Hebei Province, China
  • Supported by:
    Brain Aging and Comprehensive Intervention Research Talent Training Project, No. 381094 (to LJM)

Abstract: BACKGROUND: Brain aging can decline learning and memory functions, and the mechanism is not clear. Recent studies have found that ginsenoside Rb1 can improve the learning and memory ability of Alzheimer’s disease model mice, and its mechanism may be related to the improvement of postsynaptic density protein 95 expression.
OBJECTIVE: To investigate whether ginsenoside Rg1 can improve the learning and memory function and postsynaptic density protein 95 expression in the hippocampus of D-galactose-induced aging mice through brain-derived neurotrophic factor/TrkB signaling pathway. 
METHODS: Fifty male SPF Kunlun mice were randomly divided into five groups, A, B, C, D, and E, with 10 mice in each group. Group A: normal blank control group with no treatment; group B: brain aging model was established through subcutaneous injection of D-galactose solution 300 mg/kg per day; group C: at 1 hour after modeling, donepezil hydrochloride was intragastrically administered daily; group D: at 1 hour after modeling, ginsenoside Rg1 was intragastrically given; group E: at 1 hour after modeling, ginsenoside Rg1 (30 mg/kg per day) was intragastrically given and selective TrkB blocker ANA-12 was intraperitoneally injected every 2 days. Mice in each group were administered according to the corresponding dose and frequency for 6 weeks. The following contents were observed: learning and memory ability (open field test, novel object recognition test, and Morris water maze test); morphological observation of brain tissue using hematoxylin-eosin staining and Nissl staining; and western blot detection of postsynaptic density protein 95 and brain-derived neurotrophic factor protein expression in mouse hippocampus. 
RESULTS AND CONCLUSION: Compared with group A, the learning and memory abilities of mice in group B were significantly decreased (P < 0.05); compared with group B, the learning and memory abilities of mice were significantly improved in groups C and D (P < 0.05); compared with group D, the learning and memory abilities of mice were significantly decreased in group E (P < 0.05). Results of hematoxylin-eosin staining and Nissl staining showed that: compared with group A, the number of normal neurons in the hippocampal CA1 region was reduced and the expression of Nissl bodies was significantly reduced in group B; compared with group B, the number of normal neurons increased and the number of Nissl corpuscle granules increased significantly in groups C and D; compared with group D, the number of normal neurons was reduced and the expression of Nissl bodies were significantly reduced in group E. Western blot results indicated that compared with group A, the expressions of postsynaptic density protein 95 and brain-derived neurotrophic factor in the hippocampus of mice were significantly decreased in group B (P < 0.05); compared with group B, the expressions of postsynaptic density protein 95 and brain-derived neurotrophic factor were significantly increased in groups C and D (P < 0.05); compared with group D, the expression of postsynaptic density protein 95 was significantly decreased in group E (P < 0.05), while the expression of brain-derived neurotrophic factor had no statistical difference (P > 0.05). To conclude, ginsenoside Rg1 can improve D-galactose-induced neuronal damage and learning and memory abilities in brain aging mice and promote the expression of postsynaptic density protein 95 in the hippocampus. The brain-derived neurotrophic factor/TrKB signaling pathway may be one of its mechanisms.

Key words: brain aging, D-galactose, ginsenoside Rg1, brain-derived neurotrophic factor, TrkB signaling pathway, postsynaptic density protein 95

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