Project description:We selected wild A. venetum of four distributed regions (jinta county, minqin county, hangjinqi and baicheng) as the test materials in the study. Based on the study of community composition, population genetic diversity and soil environmental properties of wild A. venetum, physiological characteristics, transcriptomics and proteomics analysis of A. venetum under salt stress, and key regulatory proteins and genes of A. venetum salt tolerance were measured and identified to reveal the ecological adaptability of wild A. venetum and underlying mechanisms in response to salt stress. The study is beneficial to promote the protection and rational development and utilization of germplasm resources of wild A. venetum, and is of great significance to the development of national pharmacology and the construction of ecological civilization in China.
Project description:Introduction: Emerging proof suggests that Apocynum venetum flowers polysaccharides (AVFP) has immunomodulatory effects in vitro. However, the action mechanism of AVFP is still unclear in vivo. The purpose of this study is to probe into the potential mechanism of AVFP on immunosuppressed mice through investigating organ index, cytokine levels, anti-oxidative stress capacity, transcriptomics and gut microbiota. Methods: Immunocompromised mouse model induced by cyclophosphamide (CXT) was divided into 6 groups. Enzyme-labeled method, HE, transcriptomics and high-throughput sequencing were used to detect the regulatory effects of AVFP on immunocompromised mice, as well as the function of AVFP on the concentration of short-chain fatty acids (SCFAs) by high-performance liquid chromatographic analysis (HPLC). Pearson was used to analyze the correlation between intestinal microbiota and biochemical indexes. Results: The experimental results illustrated that AVFP has protective effects against CXT-induced immunosuppression in mice via prominently increasing organ index, levels of anti-inflammatory factors in serum as well as enhancing antioxidant capacity of the liver. Meanwhile, it could also signally decrease the level of pro-inflammatory cytokines in serum, the activity of transaminase in serum and the content of free radicals in liver. Transcriptomics results discovered that AVFP could play a role in immune regulation via participating in NF-κB signaling pathway, regulating the immune-related genes Bcl3, Hp, Lbp, Cebpd, Gstp2 and Lcn2. Intestinal microbiota results illustrated that AVFP could increase abundance of beneficial bacteria, reduce abundance of harmful bacteria, while dramatically improved the content of SCFAs, modulated immune responses and improved host metabolism. Spearman analysis further assessed the correlation between gut microbiota and biochemical indicators. Conclusion: These findings demonstrated that AVFP could enhance the immune effects of the immunosuppressed mice and improve the body's ability to resist oxidative stress.
