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Activation of Sirtuinl by lyceum barbarum polysaccharides in protection against diabetic cataract

作者 Yao, Qing; Zhou, Yue; Yang, Yanhui; Cai, Lianjun; Xu, Lihui; Han, Xuebo; Guo, Yu; Li, P. Andy

期刊 JOURNAL OF ETHNOPHARMACOLOGY , OCT 28 2020,:261

DOI 10.1016/j.jep.2020.113165 PubMed 32730875

摘要 Ethnopharmacological relevance: Lycium barbarum polysaccharide (LBP) extracted from the Lycium barbarum L. has been widely used to improve diabetes and its relative complications. However, the mechanisms have not fully understood. A recent study has demonstrated that LBP upregulates suituin 1 (SIRT1).Objective: This study was to define the role of Sirtl and its downstream signaling pathways in diabetic cataract using in vitro and in vivo models.Materials and methods: Human lens epithelial cell line SRA01/04 cells were cultured under high glucose (HG) medium with treatment of LBP or vehicle. Cell viability, apoptosis, protein and/or mRNA levels of Sirtl, BAX, Bcl-2, active-caspase-3, FOXO1, p27 and acetylated p53 were measured. SIRT1 upregulated- and knocked-down cells were generated and tested in high glucose culture. Diabetes mellitus was induced in rats by streptozotocin injection. Body weight, blood glucose levels, lens transparency and retinal function were assessed and SIRT1, as well as the aforementioned biomarkers were measured using Western blotting and qPCR in the animal lens samples.Results: The results showed that HG decreased cell viability and LBP prevented the decrease. The reduced viability in HG cultured SRA01/04 cells was associated with increased levels of BAX, active caspase 3, FOXO1, p27, and p53 and decreased levels of SIRT1 and Bcl-2. Further experiments using sirtl gene modulated cells showed that upregulation of Sirtl improved viability, increase cell division as reflected by an increased proportion of S phase in the cell cycle, reduced the number of apoptotic cell death and suppressed p53 acetylation and caspase 3 activation. Opposite results were observed in SIRT1 knock-down cells. Treating diabetic animals with LBP reduced body weight loss and blood glucose content in diabetic animals. Similarly, LBP hindered the development of cataract in lenses and improved retinal function. The beneficial effect of LBP on diabetic cataract was associated with the supression of p53, caspase 3, FOXO1, BAX, p27 and elevation of SIRT1 and Bcl-2, which were consistent with the in vitro findings.Conclusion: Our findings showed that diabetes caused cataract is associated with suppression of SIRT1 and Bcl-2 and activation of other cell death related genes. LBP prevented diabetic cataract in animals by upregulating Sirtl and Bcl-2 and suppressing cell death related genes.

涉及物种 黄果枸杞 Lycium barbarum