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Ginsenoside Rg1 promotes β‑amyloid peptide degradation through inhibition of the ERK/PPARγ phosphorylation pathway in an Alzheimer's disease neuronal model

  • Authors:
    • Qiankun Quan
    • Xinxin Ma
    • Ming Li
    • Xi Li
    • Haifeng Yuan
  • View Affiliations / Copyright

    Affiliations: Department of Geriatrics, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China, Department of Psychology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China, Department of Rehabilitation, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
    Copyright: © Quan et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 31
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    Published online on: November 23, 2023
       https://doi.org/10.3892/etm.2023.12319
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Abstract

β‑Amyloid peptide (Aβ) deposition in the brain is an important pathological change in Alzheimer's disease (AD). Insulin‑degrading enzyme (IDE), which is regulated transcriptionally by peroxisome proliferator‑activated receptor γ (PPARγ), is able to proteolyze Aβ. One of the members of the MAPK family, ERK, is able to mediate the phosphorylation of PPARγ at Ser112, thereby inhibiting its transcriptional activity. Ginsenoside Rg1 is one of the active ingredients in the natural medicine ginseng and has inhibitory effects on Aβ production. The present study was designed to investigate whether ginsenoside Rg1 is able to affect the regulation of PPARγ based on the expression of its target gene, IDE, and whether it is able to promote Aβ degradation via inhibition of the ERK/PPARγ phosphorylation pathway. In the present study, primary cultured rat hippocampal neurons were treated with Aβ1‑42, ginsenoside Rg1 and the ERK inhibitor PD98059, and subsequently TUNEL staining was used to detect the level of neuronal apoptosis. ELISA was subsequently employed to detect the intra‑ and extracellular Aβ1‑42 levels, immunofluorescence staining and western blotting were used to detect the translocation of ERK from the cytoplasm to the nucleus, immunofluorescence double staining was used to detect the co‑expression of ERK and PPARγ, and finally, western blotting was used to detect the phosphorylation of PPARγ at Ser112 and IDE expression. The results demonstrated that ginsenoside Rg1 or PD98059 were able to inhibit primary cultured hippocampal neuron apoptosis induced by Aβ1‑42 treatment, reduce the levels of intra‑ and extraneuronal Aβ1‑42 and inhibit the translocation of ERK from the cytoplasm to the nucleus. Furthermore, administration of ginsenoside Rg1 or PD98059 resulted in attenuated co‑expression of ERK and PPARγ, inhibition of phosphorylation of PPARγ at Ser112 mediated by ERK and an increase in IDE expression. In addition, the effects when PD98059 to inhibit ERK followed by treatment with ginsenoside Rg1 were found to be more pronounced than those when using PD98059 alone. In conclusion, ginsenoside Rg1 was demonstrated to exert neuroprotective effects on AD via inhibition of the ERK/PPARγ phosphorylation pathway, which led to an increase in IDE expression, the promotion of Aβ degradation and the decrease of neuronal apoptosis. These results could provide a theoretical basis for the clinical application of ginsenoside Rg1 in AD.
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Copy and paste a formatted citation
Spandidos Publications style
Quan Q, Ma X, Li M, Li X and Yuan H: Ginsenoside Rg1 promotes β‑amyloid peptide degradation through inhibition of the ERK/PPARγ phosphorylation pathway in an Alzheimer's disease neuronal model. Exp Ther Med 27: 31, 2024.
APA
Quan, Q., Ma, X., Li, M., Li, X., & Yuan, H. (2024). Ginsenoside Rg1 promotes β‑amyloid peptide degradation through inhibition of the ERK/PPARγ phosphorylation pathway in an Alzheimer's disease neuronal model. Experimental and Therapeutic Medicine, 27, 31. https://doi.org/10.3892/etm.2023.12319
MLA
Quan, Q., Ma, X., Li, M., Li, X., Yuan, H."Ginsenoside Rg1 promotes β‑amyloid peptide degradation through inhibition of the ERK/PPARγ phosphorylation pathway in an Alzheimer's disease neuronal model". Experimental and Therapeutic Medicine 27.1 (2024): 31.
Chicago
Quan, Q., Ma, X., Li, M., Li, X., Yuan, H."Ginsenoside Rg1 promotes β‑amyloid peptide degradation through inhibition of the ERK/PPARγ phosphorylation pathway in an Alzheimer's disease neuronal model". Experimental and Therapeutic Medicine 27, no. 1 (2024): 31. https://doi.org/10.3892/etm.2023.12319
Copy and paste a formatted citation
x
Spandidos Publications style
Quan Q, Ma X, Li M, Li X and Yuan H: Ginsenoside Rg1 promotes β‑amyloid peptide degradation through inhibition of the ERK/PPARγ phosphorylation pathway in an Alzheimer's disease neuronal model. Exp Ther Med 27: 31, 2024.
APA
Quan, Q., Ma, X., Li, M., Li, X., & Yuan, H. (2024). Ginsenoside Rg1 promotes β‑amyloid peptide degradation through inhibition of the ERK/PPARγ phosphorylation pathway in an Alzheimer's disease neuronal model. Experimental and Therapeutic Medicine, 27, 31. https://doi.org/10.3892/etm.2023.12319
MLA
Quan, Q., Ma, X., Li, M., Li, X., Yuan, H."Ginsenoside Rg1 promotes β‑amyloid peptide degradation through inhibition of the ERK/PPARγ phosphorylation pathway in an Alzheimer's disease neuronal model". Experimental and Therapeutic Medicine 27.1 (2024): 31.
Chicago
Quan, Q., Ma, X., Li, M., Li, X., Yuan, H."Ginsenoside Rg1 promotes β‑amyloid peptide degradation through inhibition of the ERK/PPARγ phosphorylation pathway in an Alzheimer's disease neuronal model". Experimental and Therapeutic Medicine 27, no. 1 (2024): 31. https://doi.org/10.3892/etm.2023.12319
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