Flavonoids and stilbenoids as a promising arsenal for the management of chronic arsenic toxicity

Rapid industrial and technological development has impacted ecosystem homeostasis strongly. Arsenic is one of the most detrimental environmental toxins and its management with chelating agents remains a matter of concern due to associated adverse effects. Thus, safer and more effective alternative therapy is required to manage arsenic toxicity. Based on existing evidence, native and indigenous plant-based active biomolecules appear as a promising strategy to mitigate arsenic-induced toxicity with an acceptable safety profile. In this regard, various phytochemicals (flavonoids and stilbenoids) are considered important classes of polyphenolic compounds with antioxidant and chelation effects, which may facilitate the removal of arsenic from the body more effectively and safely with regard to conventional approaches. This review presents an overview of conventional chelating agents and the potential role of flavonoids and stilbenoids in ameliorating arsenic toxicity. This report may provide a roadmap for identifying novel prophylactic/therapeutic strategies for managing arsenic toxicity.     

Lycopene and resveratrol ameliorate zinc oxide nanoparticles-induced oxidative stress in Nile tilapia,Oreochromis niloticus

Industrial products contained nano-zinc oxide (ZnONP) can gain access to the aquaculture environment causing hazardous effects on the living biota. Therefore, this work was planned to examine the ameliorative effects of dietary supplementation of lycopene (LYC) and/or resveratrol (RES) against ZnONP toxicity in Nile tilapia. Five groups with 20 fish each were used; Control, received tap water only; ZnONP group, was intoxicated with ZnONP (50 mg/L); ZnONP-LYC group, was exposed to ZnONP and LYC (500 mg/ kg of the diet); ZnONP-RES group, was exposed to ZnONP and RES (50 mg/kg of the diet); ZnONP-LYC-RES group, was exposed to ZnONP and a combination of LYC and RES. The experiment was continued for 30 days. Fish blood and tissues were then assembled for determination of liver and kidney function and oxidative stress status in liver, kidney, and gills tissue. Results revealed a considerable elevation of aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), cholesterol, urea, and creatinine with a noticeable lowering of total proteins and albumin serum levels in response to ZnONP intoxication. In addition, there were significant increase in malondialdehyde (MDA) and reduction in the reduced-glutathione (GSH) levels and superoxide dismutase (SOD) and catalase (CAT) activities. However, treatment with LYC and/or RES ameliorated the ZnONP-inflicted oxidative stress which possibly attributed to their beneficial antioxidant activities.     

白藜芦醇治疗结直肠癌的机制研究进展

【摘要】白藜芦醇是一种天然的多酚化合物，有预防心血管疾病，预防衰老，抗炎，抗癌等作用。该文总结了近年来白藜芦醇作用于结直肠癌的机制的研究进展，为白藜芦醇的进一步研究提供依据。     

Resveratrol improves the therapeutic efficacy of bone marrow-derived mesenchymal stem cells in rats with severe acute pancreatitis

ObjectiveBone marrow-derived mesenchymal stem cells (BMSCs) are effective in the treatment of severe acute pancreatitis (SAP), but their therapeutic effects could still be improved. In order to optimize the clinical application of BMSCs, we adopted the strategy of resveratrol (Res) pretreatment of BMSCs (Res-BMSCs) and applied it to a rat model of sodium taurocholate (NaT)-induced acute pancreatitis.MethodsSAP was induced by injection of 3% NaT into the pancreatic duct and successful induction of SAP occurred after 12 h. Rats were treated with BMSCs, Res or BMSCs primed with Res at 40 mmol/L, Vandetanib (ZD6474) daily oral dosages of 50 mg/kg vandetanib.ResultsRes stimulated BMSCs to secrete vascular endothelial growth factor A (VEGFA), activated the downstream phosphatidylinositol-4,5-bisphosphate 3-kinase (PI3K)/protein kinase B (AKT) signaling pathway, and inhibited pancreatic cell apoptosis. In addition, conditioned medium (CM) from Res-BMSCs enhanced the proliferation of human umbilical vein endothelial cells (HUVECs) in vitro, increased resistance to apoptosis and promoted the expression of angiogenesis-related proteins CD31, VEGF and VEGFR2 in pancreatic tissue, but Vandetanib partly abolished these effects by blocking the VEGFA- mediated pathway.ConclusionResveratrol-preprocessed BMSCs can activate the PI3K/AKT signaling pathway in pancreatic cells and HUVECs through paracrine release of VEGFA; thus, achieving the therapeutic effect of resisting apoptosis of pancreatic cells and promoting regeneration of damaged blood vessels. Res pretreatment may be a new strategy to improve the therapeutic effect of BMSCs on SAP.     

Resveratrol attenuates high-fat diet-induced non-alcoholic steatohepatitis by maintaining gut barrier integrity and inhibiting gut inflammation through regulation of the endocannabinoid system

1. Download : Download high-res image (110KB)
2. Download : Download full-size image

     

白藜芦醇通过抑制Akt/mTOR信号通路活性促进肺癌细胞自噬发挥抗肿瘤效应的研究

目的 探讨白藜芦醇对肺癌细胞生长活性的抑制效应及可能的机制。方法 稳定培养肺癌细胞系H292,分别加入含10、20、40 μmol·L^-1白藜芦醇的培养基进行干预,采用CCK-8、流式细胞术、细胞集落形成实验检测白芦藜醇对H292细胞生长活性的影响,采用免疫荧光、Western blotting检测白藜芦醇对细胞Akt/mTOR信号通路相关蛋白的影响。结果 （1） CCK-8检测结果显示,白藜芦醇对H292细胞增殖有明显抑制作用（P<0.05）,且呈时间和剂量依赖性,同时对H292细胞周期有明显影响,能阻滞细胞周期于G₂/M期。（2）白藜芦醇可明显抑制H292细胞集落形成（P<0.05）,并呈剂量依赖性。（3） Western blotting检测结果显示,白藜芦醇以剂量依赖的方式诱导H292细胞中LC3-II的累积。免疫荧光检测发现,白藜芦醇可诱导细胞核和线粒体中GFP-LC3显著增加。（4）自噬抑制剂3-MA能有效减弱白藜芦醇对H292细胞活力的抑制作用,溶酶体酸化抑制剂Bafilomycin A1则可促进白藜芦醇导致的LC3-II累积。（5）白藜芦醇可下调H292细胞中p-Akt、p-P70S6K、p-mTOR蛋白的表达（P<0.05）,而对Akt、P70S6K、mTOR蛋白的表达无明显影响（P>0.05）。结论 白藜芦醇可通过抑制Akt/mTOR信号通路抑制肺癌细胞的增殖。     

白藜芦醇抗肝星状细胞活性和抗肝纤维化的实验研究

目的 探讨白藜芦醇调节肝星状细胞(hepatic stellate cells,HSCs)活性及其抗肝纤维化作用.方法 从大鼠肝脏分离纯化培养HSCs;DCFH-DA法检测不同浓度白藜芦醇对HSCs中活性氧的影响;通过CCK-8比色法检测白藜芦醇对HSCs增殖的影响.Western blot检测HSCs的α-肌动蛋白(α-SMA)表达.通过PCR检测白藜芦醇对HSCs活性相关基因表达的影响.给大鼠肝纤维化模型经腹输注白藜芦醇,检测肝组织病理切片,肝纤维化指标.结果 从大鼠活体分离培养HSCs.白藜芦醇可抑制HSCs中活性氧的产生;明显抑制HSCs的α-SMA表达(103 ±7,90 ±7,63 ±4,53 ±3,F=62.179,P ＜0.05)与增殖(0.536±0.052,0.411±0.047,0.327±0.063,0.312±0.032,F=12.776,P＜0.05);抑制HSCs活性相关基因(大鼠生肌调节因子、胶原蛋白Ⅲ及胶原蛋白Ⅰ)的表达(122 ±.5,96±3,68 ±3,60 ±3,F=180.600,P ＜0.05) (100 ±8,82±3,53±3,51 ±2,F =77.451,P＜0.05) (170±3,147±4,92 ±3,90 ±2,F=462.878,P＜0.05).大鼠活体实验显示白藜芦醇可降低肝羟脯氨酸含量及血清胶原蛋白Ⅲ和透明质酸水平(358.3 ±20.2,320.5±15.3,290.3±24.5,F=23.929,P ＜0.05) (32.8±3.1,28.9±1.3,25.3±1.8,F=20.050,P＜0.05)(276.3±17.8,225.3±28.3,195.4±11.2,F=18.585,P＜0.05).结论 白藜芦醇能够抑制大鼠HSCs的活化增殖,对活体肝纤维化具有一定的抑制作用,这可能与白藜芦醇的抗氧化及抑制MyoD的表达作用有关.