Korean J Physiol Pharmacol.  2024 Jul;28(4):361-377. 10.4196/kjpp.2024.28.4.361.

Analysis of the mechanism of fibrauretine alleviating Alzheimer's disease based on transcriptomics and proteomics

Affiliations
  • 1College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun 130118, China
  • 2Key Laboratory of Animal Production, Product Quality and Security, Ministry of Education of China, Changchun 130118, China
  • 3Jilin Provincial Engineering Research Center for Efficient Breeding and Product Development of Sika Deer of China, Changchun 130118, China

Abstract

The dried rattan stem of the Fibraurea Recisa Pierre plant contains the active ingredient known as fibrauretine (FN). Although it greatly affects Alzheimer's disease (AD), the mechanism of their effects still remains unclear. Proteomics and transcriptomics analysis methods were used in this study to determine the mechanism of FN in the treatment of AD. AD model is used through bilateral hippocampal injection of Aβ1-40. After successful modeling, FN was given for 30 days. The results showed that FN could improve the cognitive dysfunction of AD model rats, reduce the expression of Aβ and P-Tau, increase the content of acetylcholine and reduce the activity of acetylcholinesterase. The Kyoto Encyclopedia of Genes and Genomes enriched differentially expressed genes and proteins are involved in signaling pathways including metabolic pathway, AD, pathway in cancer, PI3K-AKT signaling pathway, and cAMP signaling pathway. Transcriptomics and proteomics sequencing resulted in 19 differentially expressed genes and proteins. Finally, in contrast to the model group, after FN treatment, the protein expressions and genes associated with the PI3K-AKT pathway were significantly improved in RT-qPCR and Western blot and assays. This is consistent with the findings of transcriptomic and proteomic analyses. Our study found that, FN may improve some symptoms of AD model rats through PI3K-AKT signaling pathway.

Keyword

Alzheimer's disease; fibrauretine; Proteomics; Transcriptomics

Figure

  • Fig. 1 The experimental process of analyzing the mechanism of FN improving AD symptoms based on transcriptomics and proteomics. FN, fibrauretine; AD, Alzheimer’s disease.

  • Fig. 2 Result of Morris water maze experiment. (A) Escape latency. (B) Time of crossing platform. (C) Thermal infrared trajectories of positioning navigation. (D) Thermal infrared trajectories of space exploration. Values are presented as mean ± SD. N = 10. FN, fibrauretine. ##p < 0.01 vs. control group. **p < 0.01, *p < 0.05 vs. model group.

  • Fig. 3 The effects of FN on the contents of A β and P-Tau in hippocampus. (A) The expression of Aβ and P-Tau was detected by immunohistochemistry (200×). (B) Average optical density of Aβ. (C) Average optical density of P-Tau. Values are presented as mean ± SD. N = 6. FN, fibrauretine; Aβ, amyloid β. ##p < 0.01 vs. control group. **p < 0.01, vs. model group.

  • Fig. 4 Differentially expressed genes between groups. (A) Volcano plot of differentially expressed genes between the control and model group. (B) Volcano plot of differentially expressed genes between the model and FN group. (C) Venn of common differentially expressed genes in the control group and model group, model group and FN group. (D) Differentially expressed genes clustering heatmap. N = 3. FN, fibrauretine.

  • Fig. 5 GO enrichment analysis of differentially expressed genes. (A) Bubble plots of the enrichment analysis of differentially expressed genes in biological processes between the control and model group. (B) Bubble plots of the enrichment analysis of differentially expressed genes in cell composition between the control and model group. (C) Bubble plots of the enrichment analysis of differentially expressed genes in molecular function between the control and model group. (D) Bubble plots of the enrichment analysis of differentially expressed genes in biological processes between the model and FN group. (E) Bubble plots of the enrichment analysis of differentially expressed genes in cell composition between the model and FN group. (F) Bubble plots of the enrichment analysis of differentially expressed genes in molecular function between the model and FN group. N = 3. GO, Gene Ontology; FN, fibrauretine.

  • Fig. 6 KEGG enrichment analysis. (A) KEGG classification annotation map of differentially expressed genes between the control group and model group. (B) KEGG classification annotation map of differentially expressed genes between the model group and FN group. (C) Top 20 pathways enriched to KEGG in the control group vs. model group. (D) Top 20 pathways enriched to KEGG in the model group vs. FN group. N = 3. KEGG, Kyoto Encyclopedia of Genes and Genomes; FN, fibrauretine.

  • Fig. 7 The mRNA expression level of SPP1, Nr4a1, KLF4 in each group was detected by RT-qPCR. Values are presented as mean ± SD. N = 6. FN, fibrauretine. ##p < 0.01 vs. control group. **p < 0.01, *p < 0.05 vs. model group.

  • Fig. 8 PCA analysis and differentially expressed proteins volcano map, Wayne map and heat map. (A) PCA analysis between groups. (B) Differentially expressed proteins volcano map between the control group and model group. (C) Venn of common differentially expressed proteins in the control group and model group, model group and FN group. (D) Differentially expressed proteins volcanoes between the model group and FN group. (E) Differentially expressed proteins clustering heat map. N = 3. PCA, principal component analysis; FN, fibrauretine.

  • Fig. 9 GO enrichment analysis of differentially expressed proteins. (A) Control group vs. model group in terms of molecular function enriched to entries. (B) Control group vs. model group enriched to entries on biological processes. (C) Entries enriched to cell composition in the control group vs. model group. (D) The entries enriched in molecular function in the model group vs. FN group. (E) Entries enriched to biological processes in the model group vs. FN group. (F) Entries enriched to cell composition in the model group vs. FN group. N = 3. GO, Gene Ontology; FN, fibrauretine.

  • Fig. 10 KEGG classification of differentially expressed proteins in each group. (A) KEGG classification of differentially expressed proteins between the control group and model group. (B) KEGG classification of differentially expressed proteins between the model group and FN group. N = 3. KEGG, Kyoto Encyclopedia of Genes and Genomes; FN, fibrauretine.

  • Fig. 11 The effect of FN on the expression of PI3K-AKT pathway-related proteins. (A) Western blot was used to detect the expression of PI3K-AKT pathway-related proteins. (B) The level of PI3K. (C) The level of AKT. (D) The level of MTOR. Values are presented as mean ± SD. N = 3. FN, fibrauretine. ##p < 0.01, #p < 0.05 vs. control group. *p < 0.05 vs. model group.

  • Fig. 12 Overlapping of differentially expressed protein-coding genes and differentially expressed genes. N = 3.


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