枸杞果多糖对哮喘小鼠炎症损伤影响及作用机制

目的 探究枸杞果多糖对Ⅴ级卵清蛋白(OVA)诱导的哮喘小鼠模型炎症损伤影响及其作用机制.方法 以OVA诱导的哮喘小鼠为模型,并进行枸杞果多糖干预.肺组织苏木素-伊红(HE)染色、流式细胞术检测肺组织嗜酸性粒细胞水平反映炎症细胞浸润程度;肺组织马松(masson)染色检测肺组织纤维化程度,过碘酸-雪夫(PAS)染色检测支...     

Anti-inflammatory effect of the hexane fraction from Orostachys japonicus in RAW 264.7 cells by suppression of NF-κB and PI3K-Akt signaling

We investigated the anti-inflammatory effect of the hexane fraction from Orostachys japonicus (OJH) in LPS (lipopolysaccharide)-stimulated RAW 264.7 cells. Pretreatment with OJH dose-dependently reduced the cellular NO (nitric oxide) concentration and also inhibited expression of iNOS (inducible nitric oxide synthase) protein and mRNA. By the prevention of IκBα (inhibitory factor kappa B alpha) phosphorylation and degradation, OJH inhibited LPS-induced NF-κB (nuclear factor-kappa B) activation. OJH had no effect on the LPS-induced phosphorylation of ERK (extracellular signal-regulated kinase), JNK (c-Jun N-terminal kinase), or p38, whereas it attenuated the phosphorylation of Akt in a dose-dependent manner. In addition, OJH suppressed the LPS-induced expression of LPS receptors CD14 and TLR4 (toll like receptor 4). These results suggest that OJH may interrupt LPS-induced pro-inflammatory cascades through inhibition of NF-κB and Akt activation.     

枸杞子多糖通过改善氧化应激延缓疲劳作用的研究

本文研究枸杞子多糖（LBP）对小鼠疲劳的延缓作用及机制。将昆明种小鼠分为空白对照组（给予生理盐水）和高、中、低剂量枸杞子多糖处理组（剂量分别为100、50和25 mg/kg/day）,灌胃给药2周,通过跑步、疲劳转棒和负重游泳实验考察枸杞子多糖对小鼠的抗疲劳作用,并对运动后小鼠体内肝糖原、肌糖原以及血清、肝脏和肌肉中抗氧化指标进行检测。实验结果表明,LBP可以明显延长小鼠的运动时间,增加小鼠肝糖原和肌糖原含量,同时明显提高血清、肝脏和肌肉中超氧化物歧化酶（SOD）和谷胱甘肽过氧化物酶（GSH-Px）的活性,显著降低肝脏和肌肉中丙二醛（MDA）和活性氧（ROS）含量及血清中MDA含量。LBP具有延缓疲劳的作用,其机制可能是减弱氧化应激和提高糖原含量。      

大孔吸附树脂脱除枸杞多糖色素技术研究

以宁夏枸杞为原料提取枸杞多糖,采用9种大孔吸附树脂对多糖提取液中色素脱除技术进行研究。在静态实验的基础上,采用正交实验筛选出色素脱除效果最佳的树脂。以脱色率、多糖保留率和蛋白清除率为指标,衡量树脂脱色效果。结果表明:D318树脂脱除色素的效果最佳,样液质量浓度3mg/mL、树脂用量3g/25mL、pH7、处理3h时D318树脂的脱色率、多糖保留率和蛋白清除率分别为67.32%、85.49%和58.76%。      

配制白酒中枸杞多糖含量测定方法的研究

该文研究了配制白酒中枸杞多糖含量的测定方法。样品前处理醇沉浓度为95%vol,浓缩方法为水浴蒸干。枸杞多糖在1.70mg/L~17.04mg/L范围内呈良好的线性关系,相关系数R=0.9998,平均加标回收率95.35%,相对标准偏差为1.73%。说明用紫外-可见分光光度法所建立的方法简便、准确,重复性好,精密度高,可用于配制白酒中枸杞多糖的质量控制。     

纤维素酶提取枸杞多糖及工艺优化

通过单因素和正交实验对纤维素酶提取枸杞粗多糖的工艺条件进行优化,结果表明:最佳酶解工艺条件为纤维素酶用量0.45%、pH为4.5、酶解温度50℃、酶解时间160min,在此优化条件下,提取枸杞粗多糖的得率为23.68%,与热水法浸提的粗多糖8.65%相比有明显提高。其中采用酶法提取的粗多糖中的枸杞多糖含量也提高到了31.3%,为热水浸提法所得枸杞多糖含量的1.8倍。     

枸杞酒多糖的提取、成分测定及其对酒精性肝病的影响研究

以枸杞酒作为原料提取枸杞多糖,对其成分进行测定,并探讨其对酒精肝病的影响。将60只雄性C57BL/6小鼠随机分为对照组、模型组、对照+枸杞多糖组、模型＋枸杞多糖组。测定各组小鼠血清丙氯酸氨基转移酶（ALT）、天冬氨酸氨基转移酶（AST）及内毒素（LPS）的含量;酶联免疫吸附实验（ELISA）检测小鼠血清和肝脏炎症因子的变化。结果表明,枸杞酒中提取出的多糖含量为1.2 g/L,其中矿物质元素有Ca、P、Mg、K、Na,分别为0.09%、0.69%、0.28%、3.92%、0.51%。其17种氨基酸中天冬氨酸（ASP）及谷氨酸（GLU）的含量较多,分别为7.25%及4.96%。与模型组相比,模型＋枸杞多糖组ALT、AST及LPS含量明显降低（P＜0.05）,炎症细胞因子IL-1β、IL-6、TNF-α含量显著降低（P＜0.05）。表明枸杞酒多糖可明显缓解酒精性肝损伤。     

枸杞多糖的硒化及其对人宫颈癌细胞的抑制作用

在硝酸催化作用下,利用亚硒酸钠对枸杞多糖进行分子修饰,合成硒化枸杞多糖,反应条件为硝酸体积分数0.5%,70℃反应10h,透析24h。采用体外抗肿瘤实验测定硒化枸杞多糖对人宫颈癌细胞生长的抑制作用。结果显示硒化枸杞多糖对人宫颈癌细胞具有一定的抑制作用,与未硒化的枸杞多糖相比有显著性差异,且呈一定的剂量依赖性。     

基于RAW264.7细胞模型的不同茶类抗炎功能特性

茶叶根据经典加工工艺不同分为红茶、绿茶、青（乌龙）茶、白茶、黄茶、黑茶。为探讨不同加工工艺形成的不同茶类的抗炎功能特性,本研究以云南大叶种绿茶、红茶、普洱黑茶、金观音乌龙茶、福鼎大白白茶、君山银针黄茶为材料。采用硝普化钠法和脂多糖诱导RAW264.7巨噬细胞为体外炎症模型评价抗炎活性。结果发现,绿茶、白茶及黄茶对一氧化氮（NO）的清除能力较强,半抑制浓度（IC50）值在99.27¹04.83μg/m L范围内;在六种茶类中,黄茶对脂多糖诱导RAW264.7细胞产生炎症反应的抑制作用最强,其抑制NO产生的IC50值为398.13μg/m L,在浓度为500μg/m L时,其对肿瘤坏死因子α（TNF-α）和白介素6（IL-6）的抑制率分别为69.25%、87.68%;黄茶可在基因转录和翻译水平上,显著下调i NOS基因的转录和翻译。相关性分析表明,茶多酚含量与清除NO的IC50值、抑制细胞产生NO的IC50值、TNF-α以及IL-6产生量均呈显著负相关。表明六种茶类均具有抗炎活性,黄茶对促炎症因子（NO、TNF-α、IL-6）的抑制效果最佳,可通过下调i NOS基因的转录和翻译水平,减少NO产生,从而发挥抗炎功效。      

微波消解-1-苯基-3-甲基-5-吡唑啉酮柱前衍生-高效液相色谱法测定枸杞多糖含量及组成

目的 建立微波消解-1-苯基-3-甲基-5-吡唑啉酮(1-phenyl-3-methyl-5-pyrazolone, PMP)柱前衍生-高效液相色谱法(high performance liquid chromatography, HPLC)测定枸杞多糖(Lycium barbarum polysaccharides, LBPs)含量及组成的方法。方法 采用微波消解技术水解LBPs进行样品前处理,利用PMP进行柱前衍生,建立结合HPLC检测LBPs的方法,并利用该方法测定4个不同枸杞产地LBPs的含量及单糖组成。结果 经方法学评价,8种单糖均具有良好的线性关系,相关系数均大于0.98;平均加标回收率为94.95%~99.22%,相对标准偏差小于1.90%;检出限和定量限良好。结论 该方法可用于LBPs含量及组成的测定,分析表明LBPs主要由葡萄糖、阿拉伯糖、半乳糖、甘露糖、鼠李糖、木糖、葡萄糖醛酸、半乳糖醛酸组成,不同产地LBPs含量存在差异,其中甘肃玉门含量较高。     

大粒车前子多糖对脂多糖刺激RAW264.7巨噬细胞的免疫调节作用

采用脂多糖构建RAW264.7巨噬细胞炎症模型,研究大粒车前子多糖的抗炎作用。培养巨噬细胞RAW264.7,利用脂多糖构建细胞炎症模型,中性红吞噬实验检测细胞吞噬活性;酶联免疫吸附法检测车前子精制多糖（Plantago asiatica L. crude polysaccharide,PLCP）处理前后细胞上清液中肿瘤坏死因子-α（tumor necrosisfactor-α,TNF-α）、白细胞介素-10（interleukin-10,IL-10）和IL-6的分泌量,Griess反应测定RAW264.7细胞释放NO水平。结果表明,PLCP可显著抑制RAW264.7炎症细胞的吞噬活性,降低炎症细胞因子TNF-α、IL-10和IL-6的分泌量及NO的释放量。     

山楂酸调控STAT3磷酸化保护LPS致RAW264.7细胞炎症反应的研究

探讨山楂酸对脂多糖诱导的RAW264.7细胞炎症反应的保护作用及其对信号转导和转录活化因子3(STAT3)磷酸化的抑制作用.采用Griess法检测一氧化氮(NO)的生成,ELISA法检测细胞中白介素6(IL-6)、白介素1β(IL-1β)和白介素10(IL-10)的释放量;Western blot法检测诱导型一氧化氮合...     

枸杞子多糖不同组分的双向免疫调节机制研究进展

枸杞子多糖是枸杞中的主要功能成分,具有良好的免疫调节活性。现有研究大多关注枸杞子多糖的免疫促进功能,对其免疫抑制机制缺乏深入探索。因此,本文从肠黏膜保护、肠道菌群变化、免疫细胞和神经内分泌系统等方面,针对枸杞子多糖不同组分的免疫增强/抑制机制展开综述,为其在抗病毒治疗、抗肿瘤治疗、多种疫苗开发、动物饲料免疫增强配方和抗过敏药物/食品中的应用提供参考。     

兜唇石斛发酵多肽Asp-Asp-Asp-Tyr和Asp-Tyr- Asp-Asp对LPS诱导RAW264.7细胞的抗炎作用

为了研究兜唇石斛发酵多肽Asp-Asp-Asp-Tyr（DDDY）、Asp-Tyr-Asp-Asp（DYDD）对LPS诱导的RAW264.7巨噬细胞抗炎活性。以合成的兜唇石斛发酵多肽为研究对象,采用噻唑蓝法筛选增殖活性最高的发酵多肽浓度,通过中性红吞噬实验和倒置显微镜观察发酵多肽对细胞的吞噬作用和分化形态变化,使用ELISA试剂盒测定细胞中NO及细胞因子IL-1β、IL-6、IL-10和肿瘤坏死因子TNF-α的分泌量。结果表明：12.5、25、50和100 μg/mL四组质量浓度的发酵多肽对细胞无毒性并有增殖作用;100 μg/mL的DDDY和DYDD和1 μg/mL的LPS处理可以激活细胞,增强细胞吞噬能力,相对吞噬率为2.05%、1.97%和2.19%;构建LPS诱导的RAW264.7细胞炎症模型,发现两种发酵多肽处理有效抑制细胞分化,使细胞恢复正常形态;抑制细胞NO分泌能力,100 μg/mL DDDY和DYDD处理组的NO分泌能力降低到LPS组的0.41倍和0.49倍;并且对抑炎细胞因子分泌能力的提高和促炎细胞因子的降低有显著效果,均表现出剂量反应关系。由此可知,DDDY和DYDD对LPS诱导的RAW264.7巨噬细胞炎症反应具有抗炎作用,为后面探究发酵多肽的炎症机制提供理论支持。     

Lycium barbarum polysaccharide inhibits the proliferation of HeLa cells by inducing apoptosis

BACKGROUND: Lycium barbarum polysaccharide (LBP), isolated with boiling water from the famous Chinese medicinal herb Lycium barbarum fruits, is one of the most important functional constituents in Lycium barbarum. In this study the effects of LBP on cell proliferation, cell cycle and apoptosis in human cervical carcinoma cells (HeLa cells) were investigated. RESULTS: LBP could inhibit the proliferation of HeLa cells by changing cell cycle distribution and inducing apoptosis. In addition, the loss of mitochondrial transmembrane potential (Δψ_m) was observed by flow cytometry and the increase of intracellular Ca²⁺ concentration was detected by laser scanning confocal microscope in apoptotic cells. At the same time, the nitric oxide content, nitric oxide synthase and inducible nitric oxide synthase activities were also increased. CONCLUSION: The inhibitory effect of LBP on the proliferation of HeLa cells was caused by inducing apoptosis through the mitochondrial pathway. The results showed that LBP can be developed as a potential chemotherapeutic agent candidate against human cervical cancer. Copyright © 2012 Society of Chemical Industry     

Comparison of Immunomodulatory Effects of Fresh Garlic and Black Garlic Polysaccharides on RAW 264.7 Macrophages

Garlic has a long history to be used for medicine and food purposes. Black garlic, the fermented product of fresh garlic, is considered with better biological activities, such as antioxidant activity, and is developed as an increasingly popular functional food. Polysaccharides are the major components of fresh and black garlic, and immunomodulatory activity is one major pharmacological effect of polysaccharides. Therefore, chemical characteristics and immunomodulatory effects of polysaccharides from fresh and black garlic are investigated and compared in vitro for the 1st time, in order to reveal their molecular and pharmacological differences. It is demonstrated that the molecular weights of polysaccharides from the 2 sources and molar ratios of monosaccharides after acid hydrolysis are greatly variant. The effects of polysaccharides from 2 sources on RAW 264.7 macrophages functions, including promotion of phagocytosis, release of NO, and expressions of several immune‐related cytokines (including interleukin [IL]‐6, IL‐10, tumor necrosis factor alpha, and interferon gamma), were different from each other. The results indicated that fresh garlic polysaccharide exhibited stronger immunomodulatory activities than that of black garlic. Moreover, it is revealed that fructan might be the bioactive component in garlic and it is indicated that during the fermentation treatment, fructan constituents of garlic has degraded, and basically no immunomodulatory effect can be found in black garlic polysaccharides.