玉米芯抗肿瘤活性研究

采用MTT法检测玉米芯水提物对人结肠癌细胞株SW480、SW620、DLD1以及正常人肝细胞HL-7702的增殖活力的影响;倒置显微镜下观察细胞形态的变化;DAPI染色法检测该水提物对不同细胞株细胞核凋亡的影响.结果表明:不同浓度(1、2、4、6 mg/mL)的玉米芯水提物对人结肠癌细胞株均有抑制能力,且呈明显的量效依赖关系.用该水提物处理正常细胞HL-7702,在低浓度时没有抑制作用,在高浓度时略有抑制作用.该水提物对各细胞株作用24h,半数抑制浓度(IC50)分别为2、3、4、6 mg/mL.显微镜观察表明:经该玉米芯水提物处理后的结肠癌细胞,形态发生明显的改变,细胞形状变圆,贴壁细胞数量明显减少.DAPI染色结果显示:多数细胞核表现出染色质的不均一性,有典型的“梅花”状凋亡小体出现.     

内生镰刀菌Dzf17多糖对盾叶薯蓣培养物薯蓣皂苷元积累的促进作用(英文)

从盾叶薯蓣(Dioscorea zingiberensis)内生镰刀菌(Fusarium oxysporum)Dzf17制备出胞外多糖(EPS)、菌丝水提多糖(WPS)和菌丝碱提多糖(SPS),研究了这3种多糖对盾叶薯蓣幼苗和细胞培养物薯蓣皂苷元积累的影响。3种多糖中,菌丝水提多糖对盾叶薯蓣幼苗和细胞培养物薯蓣皂苷元的积累有最明显的促进作用。向培养基中添加20 mg/L的菌丝水提多糖培养盾叶薯蓣幼苗和细胞,薯蓣皂苷元的产率分别为10.04 mg/L和2.40mg/L,是对照的3.11倍和3.87倍。结果表明,可以利用内生镰刀菌Dzf17多糖有效提高盾叶薯蓣培养物中薯蓣皂苷元的产量。     

瓜蒂醇提物通过调控Wnt/β-catenin信号通路对肝癌细胞Hep3B恶性生物学行为的影响

该文探讨了瓜蒂醇提物对肝癌细胞Hep3B增殖、迁移、侵袭和凋亡的影响及其分子机制。肝癌细胞Hep3B被分为NC组、不同浓度瓜蒂醇提物(1.0、5.0、10.0、20.0μg/mL)组、LiCl组、20.0μg/mL瓜蒂醇提物+LiCl组。采用CCK-8法检测细胞活性;克隆形成实验检测Hep3B细胞克隆形成数量;流式细胞术检测Hep3B细胞的凋亡情况;蛋白质印迹法检测蛋白表达情况; Transwell检测Hep3B细胞的迁移和侵袭数。不同浓度瓜蒂醇提物处理Hep3B细胞后, Hep3B细胞的活性降低,克隆数量以及迁移侵袭数减少, Hep3B细胞的凋亡率升高, Cleaved-caspase-3表达水平升高, procaspase-3、MMP2、MMP9表达水平降低, Wnt3a、cyclinD1、c-myc、核β-catenin蛋白表达水平降低,APC和质β-catenin蛋白表达水平升高(P<0.05)。Wnt/β-catenin信号通路激活剂LiCl可以逆转瓜蒂醇提物对Hep3B细胞增殖、迁移、侵袭和凋亡的影响。瓜蒂醇提物通过调控Wnt/β-catenin信号通路抑制Hep3B...     

柴胡复方水提物对大鼠急性胃溃疡预防作用的影响

目的:研究柴胡复方水提物对大鼠急性胃溃疡预防作用的影响.方法:大鼠灌胃给予消炎痛(70 mg/kg)复制急性胃溃疡模型,测定胃溃疡指数和溃疡抑制率,常规苏木素-伊红染色观察胃黏膜病理形态学的改变,一氧化氮硝酸还原酶法测定血清一氧化氮(NO)含量的变化,黄嘌呤氧化酶法测定血清超氧化物歧化酶(SOD)的活力,观察柴胡复方水提物对大鼠急性胃溃疡的预防作用.结果:阳性药物Stillen组(100 mg/kg)、柴胡复方水提物低剂量(100mg/kg)和高剂量组(200mg/kg),溃疡指数明显低于溃疡模型组(P＜0.01),溃疡抑制率分别为48％、79％和80.9％,血清SOD较模型组显著降低(P＜0.01);与模型组比较,柴胡复方水提物高低剂量组血清NO降低(P＜0.05);胃组织病理形态学观察,模型组胃黏膜层大量缺失,严重者已脱落坏死,黏膜下层充血、水肿,且有少量纤维素、炎性细胞浸润,阳性药物组和柴胡复方高低剂量组胃组织病变有明显改善.结论:柴胡复方水提物对大鼠急性胃溃疡模型有明显的预防保护作用.     

制首乌醇提物及其主要成分大黄素对斑马鱼非酒精性脂肪肝的治疗作用

研究制首乌醇提物及其主要成分大黄素对斑马鱼非酒精性脂肪肝疾病(non-alcoholic fatty liver disease, NAFLD)的治疗作用。选取野生型斑马鱼若干,随机均分为对照组、模型组、制首乌醇提物(RPMP)组和大黄素(emodin)组,于胚胎受精后5天,对照组给于普通饲料AP100,模型组给予2 mg/mL蛋黄粉(EY powder),制首乌醇提物组分别给予2 mg/mL蛋黄粉与低剂量组(1 mg/mL)、中剂量组(1.5 mg/mL)、高剂量组(2 mg/mL),大黄素组分别给予2 mg/mL蛋黄粉与低剂量组(0.25μg/mL)、中剂量组(0.5μg/mL)、高剂量组(1μg/mL)。72 h后观察斑马鱼存活率和体重、体长、BMI的变化■,用整体油红染色评判脂肪肝发生率,石蜡切片观察肝组织病理形态,甘油三酯(TG)、总胆固醇(TC)试剂盒判断斑马鱼体脂含量。制首乌醇提物组与大黄素组能显著降低非酒精性脂肪肝斑马鱼的死亡率、BMI、TG含量,并显著改善斑马鱼幼鱼肝脏脂质沉积情况(P<0.05)。由此可见制首乌醇提物与大黄素可有效治疗斑马鱼NAFLD,且大黄素可能为制首乌治疗NAFLD的主要有效成分。     

脱氧胆酸钠对人脐静脉内皮细胞凋亡的影响

目的:探讨脱氧胆酸钠(SD)对体外培养的人脐静脉内皮细胞(HUVEC)凋亡的影响。方法:(1)以不同终浓度(0、0.015mg/mL、0.05 mg/mL、0.15 mg/mL、0.5 mg/mL、1.0 mg/mL)的脱氧胆酸钠分别作用于人脐静脉血管内皮细胞,使用CCK-8检测细胞活力、TUNEL荧光染色检测细胞凋亡;(2)以终浓度为0.15 mg/mL的SD作用于HUVEC4、8、12 h后用Western blot检测Caspase-3、7、9蛋白及PARP活化情况;(3)观察Caspase-3抑制剂Z-DEVD-FMK对0.15 mg/mL脱氧胆酸钠组的影响。结果:CCK8结果显示随SD浓度(0~1.0 mg/mL)及作用时间(0~12 h)增加,HUVEC活力降低,0.15 mg/mL时活力为80%,1.0 mg/mL时细胞活力仅不到10%;Tunel检测示随着SD浓度的增加HUVEC凋亡明显增多;Western Blot结果示SD作用于HUVEC后Caspase-3、7、9蛋白及PARP活化明显增加;Z-DEVD-FMK明显抑制了0.15 mg/mLSD引起的PARP活化。结论:脱氧胆酸钠(SD)通过启动Caspase级联反应介导了人脐静脉内皮细胞的凋亡。     

长裂苦苣菜水提取物对肺癌细胞A549增殖和凋亡的影响

为了探讨长裂苦苣菜水提取物对肺癌细胞A549的影响,本研究用不同浓度的长裂苦苣菜水提取物作用于体外培养的A549细胞,从细胞形态(显微镜观察)、细胞增殖活力(CCK-8法)、细胞凋亡(Annexin V-FITC/PI染色)、线粒体膜电位(JC-1染色)和细胞内活性氧水平(荧光探针DCFH-DA染色)几个方面检测长裂苦苣菜水提取物对体外培养的A549细胞的影响。当处理浓度达到1 mg/mL作用细胞48 h后,细胞出现明显皱缩的凋亡形态学特征,与对照组相比处理组细胞增殖活力明显下降(P0.05)。进一步用流式细胞仪检测发现≥1mg/mL的处理浓度作用细胞48 h后细胞凋亡率显著提高(P0.05),同时检测到处理组细胞的膜电位都明显下降,细胞内活性氧水平明显上升,都呈剂量依赖关系。这些结果表明长裂苦苣菜水提取物可以诱导A549细胞凋亡,并抑制其生长和增殖,是一种潜在的预防和抑制肿瘤生长的药食两用植物。     

牛樟芝多糖对HepG2细胞酒精性氧化损伤的保护作用

研究了不同剂量(100、200和400μg/mL)的牛樟芝粗多糖(CP)和醇提物后的水提物(WEE)对酒精诱导的HepG2细胞氧化损伤的保护作用.研究结果表明:与模型组比较,各剂量组的CP和200、400μg/mL的WEE均能极显著提高HepG2细胞的细胞活力.100μg/mL的CP和WEE均能极显著降低细胞培养液的A...     

ERK1/2信号通路对黄芪苷Ⅳ抗H_2O_2诱导H9c2细胞氧化损伤的作用

目的:研究黄芪苷Ⅳ(AST)是否通过细胞外信号调节激酶1/2(ERK1/2)通路发挥对H2O2诱导的H9c2细胞氧化损伤的保护作用。方法:用200μmol/L的H2O2处理细胞6 h,采用MTT法检测细胞存活率,建立H2O2诱导的H9c2细胞氧化损伤模型;比色法测定细胞培养液中乳酸脱氢酶(LDH)活性、总超氧化物歧化酶(T-SOD)和锰超氧化物歧化酶(Mn-SOD)活力以及丙二醛(MDA)含量;Western blot检测H9c2细胞ERK1/2蛋白的磷酸化水平。结果:在H2O2浓度为200μmol/L作用6 h条件下,细胞存活率降低程度适中,实验结果重复性好,确定后续实验采用200μmol/L H2O2作用6 h建立模型。与H2O2组比较,10 mg/L及20 mg/L AST均显著提高细胞存活率(P<0.01),使细胞培养液中LDH活性显著降低(P<0.01),T-SOD及Mn-SOD活力显著提高(P<0.01),MDA含量显著降低(P<0.01)。10 mg/L及20 mg/L AST均显著增加H2O2损伤的H9c2细胞p-ERK1/2蛋白的表达(P<0.01),当用PD98059(ERK1/2的抑制剂...     

不同植物药提取物对灵芝细胞生长和胞内三萜产物形成的影响

研究了不同植物药的水提和醇提物对灵芝深层发酵过程中菌丝量和胞内三萜产量的影响。将不同植物药的水提物和醇提物分别加入到发酵基础培养基中,培养7d后检测灵芝生物量和胞内三萜含量。结果表明,金银花和枸杞子水提物添加浓度为100mg/L时,可促进灵芝细胞的生长（p＜0.05）。连翘水提物对灵芝生长和胞内三萜的形成都有显著促进作用,当连翘水提物浓度为400mg/L时,胞内三萜产量从对照的（192.54±8.99）mg/L提高到（302.52±3.79）mg/L。金银花和枸杞子醇提物浓度为200mg/L时能显著促进灵芝细胞生长;枸杞子醇提物在同样浓度下还能促进灵芝胞内三萜的形成。但板蓝根和银杏叶水提物和醇提物都对灵芝的细胞生长和胞内三萜形成有较强的抑制作用。     

Functional proteomics reveal the effect of Salvia miltiorrhiza aqueous extract against vascular atherosclerotic lesions

Salvia miltiorrhiza is a Chinese herb widely used for cardiovascular disorder regimens, yet little is known about the cellular mechanisms that contribute to attenuated growth of smooth muscle cells (SMCs) under oxidative stress such as homocysteine (Hcy) treatment. As anticipated, a low dose (0.015 mg/mL) of S.miltiorrhiza aqueous extract (SMAE) significantly inhibited (> 60%) the growth of a rat smooth muscle cell line (A10) under Hcy stimulation and the intracellular reactive oxygen species (ROS) concentration obviously decreased after SMAE treatment in terms of reducing p47^phox translocation and increasing catalase activity. Signaling profile suggests that SMAE inhibited Hcy-induced A10 cell growth via the PKC/MAPK-dependent pathway. Two-dimensional electrophoresis (2-DE) coupled with mass spectrometry revealed statistically significant changes in the intensity of 14 proteins in response to Hcy and Hcy/SMAE. Meanwhile, SMAE attenuated carbonyl-modification of specific cytoskeleton and chaperone proteins leading to cell type transformation. Moreover, a network analysis using MetaCore™ shed more light on the molecular basis associated with SMAE efficacy. SMAE exerts its protective effect through the scavenging of ROS and subsequent modulation of protein carbonylation to inhibit cell proliferation. These signature networks and functional proteomics highlighted herein may facilitate the evaluation of potential therapeutic targets and elucidate novel mechanisms through which protein functions can be regulated by the redox status.     

Comparative evaluation of antioxidant, nitrite scavenging, and antitumor effects of Antrodia camphorata extract

The effects of decoctions prepared from Antrodia camphorata on antioxidant, nitrite scavenging, and antitumor activities were investigated. Glutathione (GSH) production was 18.2 μM/g of rat liver under the influence of a methanol extract, a result similar to with the effect of silymarin administration. GSH peroxidase activity was about 2.0-fold higher than with silymarin administration. Superoxide dismutase activity was 18.9 U/mg protein, about 2.5-fold higher than the control group. The hot water extract (1000 μg/mL) showed the highest nitrite scavenging activity at 98.1%, similar to those observed with BHA and vitamin E. Among a variety of human cancer cell lines, when the concentration of hot water extract was increased from 31 to 500 μg/mL, the viability of Hep3B cell was decreased from 100 to 60.7%. On the other hand, in the case of methanol extract, it was decreased from 98.4 to 10.0%. These results supported the conclusion that the antioxidant, nitrite scavenging, and antitumor activities of this A. camphorata methanol extract indicate a potential source for the development of various health supplements and pharmaceutical and nutraceutical applications.     

紫穗槐种子提取物的抑菌活性研究

目的研究紫穗槐种子提取物的抑菌活性。方法将紫穗槐种子乙醇提取物分别通过石油醚、乙酸乙酯和正丁醇萃取,选择金黄色葡萄球菌和肺炎克雷伯杆菌为供试菌,采用试管二倍稀释法测定紫穗槐种子提取物的最小抑菌浓度（MIC）和最小杀菌浓度（MBC）,涂布平板法绘制杀菌曲线,电镜下观察药物对细菌超微结构的影响。结果紫穗槐种子提取物经乙酸乙酯萃取后对供试菌抑制作用较强,其中对金黄色葡萄球菌的MIC和MBC分别为2．5、5．0mg／mL;对肺炎克雷伯杆菌的MIC和MBC分别为5．0、10．0mg／mL;杀菌曲线结果表明,药物对供试菌的抑制作用存在浓度和时间依赖性;电镜结果说明,药物的作用可能与破坏菌体细胞壁、改变细胞膜通透性有关。结论紫穗槐种子提取物具有显著的抗菌活性。     

甘草提取物通过调控miR-212-5p/BCL2L2 基因抑制甲状腺肿瘤细胞的增殖、迁移和侵袭

目的探讨甘草提取物GL-1对甲状腺肿瘤细胞增殖、迁移和侵袭的影响及其分子机制。方法以10、20、30 μg/mL GL-1处理甲状腺肿瘤细胞CAL-62,或在CAL-62细胞中转染miR-212-5p mimics、anti-miR-212-5p、si-BCL2L2、pcDNA-BCL2L2。其中转染pcDNA-BCL2L2细胞并以30 μg/mL GL-1处理。噻唑蓝比色法 (MTT)检测CAL-62细胞增殖,Transwell小室法检测CAL-62细胞迁移和侵袭,实时定量PCR (qPCR)检测CAL-62细胞中miR-212-5p表达,Western blot检测相关蛋白Bcl-2样蛋白2 (BCL2L2)、细胞周期蛋白D1 (Cyclin D1)和基质金属蛋白酶-2 (MMP-2)表达。生物学信息预测miR-212-5p的下游靶基因,双荧光素酶基因报告实验进一步验证。数据采用单因素方差分析、Tukey’s事后检验和t检验。结果与对照组相比,10、20、30 μg/mL浓度GL-1降低CAL-62细胞24、48、72 h的细胞活性 (P < 0.05),并呈剂量、时间依赖性。与对照组相比,10、20、30 μg/mL浓度GL-1干预后,CAL-62细胞侵袭数[(143.56±14.22)个、(100.32±10.23)个、(68.23±6.49)个比(189.65±15.23)个]、迁移数[(198.56±14.35)个、(141.35±12.58)个、(89.56±8.95)个比 (295.36±17.56)个]和BCL2L2蛋白表达量 (0.76±0.08、0.51±0.06、0.24±0.02比1.00±0.12)均降低 (P 均< 0.05),而miR-212-5p水平 (1.61±0.11、1.99±0.13、2.28±0.15比1.00±0.07)升高(P < 0.05),并呈剂量依赖性。过表达miR-212-5p和沉默BCL2L2表达在24、48、72 h时CAL-62细胞活性、细胞迁移数、侵袭数和Cyclin D1、MMP-2蛋白表达量降低 (P < 0.05)。生物学信息预测和双荧光素酶基因报告实验证实BCL2L2是miR-212-5p的靶基因。过表达miR-212-5p抑制BCL2L2蛋白水平,沉默miR-212-5p促进BCL2L2蛋白表达 (P < 0.05)。过表达BCL2L2可逆转GL-1对CAL-62细胞增殖、迁移、侵袭及Cyclin D1、MMP-2蛋白表达的抑制作用。结论 GL-1通过miR-212-5p/BCL2L2抑制甲状腺肿瘤细胞的增殖、迁移和侵袭。     

C-reactive protein can influence the proliferation, apoptosis, and monocyte chemotactic protein-1 production of human umbilical vein endothelial cells

C-reactive protein (CRP) has been shown to be closely associated with coronary heart disease. The serum CRP concentrations of chronic periodontitis (CP) patients were increased due to periodontal inflammation. CRP may be a potential key mediator associating CP with coronary heart disease. This study aimed to investigate the effects of CRP on human endothelial cells in vitro. CRP ranging from 0 to 10 μg/mL was adopted to imitate the chronic inflammatory conditions of periodontitis. The influences of CRP on proliferation, apoptosis, and monocyte chemotactic protein-1 (MCP-1) production of human umbilical vein endothelial cells (HUVECs) were studied through 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay, flow cytometry, and enzyme-linked immunosorbent assay analysis, respectively. Compared to the blank control, 2.5 and 5.0 μg/mL CRP significantly suppressed cell proliferation by 6.9% and increased apoptosis by 10.2% and 14.6%, respectively (p<0.05). Concentrations of 7.5 and 10.0 μg/mL CRP also induced 2.3% HUVEC proliferation suppression (p>0.05) and significantly increased apoptosis ratio compared to that of the blank control. CRP could promote MCP-1 production of HUVECs in a concentration-dependent manner. The MCP-1 production of 10.0 μg/mL CRP group was about 15.3% higher than that of the control group. It is concluded that low concentrations of CRP, which appears in CP, inhibits cell proliferation, promotes cell apoptosis, and increases MCP-1 production in endothelium, which may initiate self-repairing function of vascular endothelium following vascular injury process.     

Evaluation of zebrafish (Danio rerio) PGCs viability and DNA damage using different cryopreservation protocols

Cryopreservation of primordial germ cells (PGCs) is a better alternative for the conservation of the diploid genome in fish until embryo cryopreservation is achieved. A good cryopreservation protocol must guarantee high survival rates but also absence of genetic damage. In this study, a cell toxicity test using several internal and external cryoprotectants was carried out. The best combination of cryoprotectants (DMSO 5 mol/L, ethylene glicol (EG) 1 mol/L, polyvinyl pyrrolidone (PVP) 4%) was used with and without antifreeze proteins (AFPs) at two different concentrations (10 mg/mL and 20 mg/mL) for cryopreservation trials. Different cryopreservation methods were used with single PGCs, genital ridges, and whole zebrafish embryos using cryovials, 0.5 mL straws, microcapsules, and microdrops. All embryos were obtained from the vasa EGFP zf45 transgenic line and viability was evaluated using trypan blue. High cell viability rates after cryopreservation in 0.5 mL straws were obtained (around 90%) and a decrease in viability was only observed when cells were cryopreserved in microcapsules and when AFP at 20 mg/mL was added to the freezing media. Genetic damage was determined by comet assay and was compared in cells cryopreserved in 0.5 mL straws and microcapsules (lowest viability rate). There were significantly more DNA strand breaks after cryopreservation in the cells cryopreserved without cryoprotectants and in those cryopreserved in microcapsules. Genetic damage in the cells cryopreserved with cryoprotectants in 0.5 mL straws was similar to fresh control samples, regardless of the concentration of AFP used. The decrease in PGC viability with the addition of AFP 20 mg/mL did not correlate with an increase in DNA damage. This study reported a successful method for zebrafish PGC cryopreservation that not only guarantees high cell survival but also the absence of DNA damage.     

岩藻糖基化人乳低聚糖在新生儿无乳链球菌肺炎治疗中的作用

目的探讨岩藻糖基化人乳低聚糖在新生儿无乳链球菌肺炎中的治疗作用。方法收集本院2015年7月至2017年2月痰培养阳性新生儿无乳链球菌、大肠埃希菌和肺炎克雷伯菌感染性肺炎病例,分析不同喂养方式、不同病原类别肺炎在住院时间、炎症、并发症等指标差异,探讨岩藻糖基化人乳低聚糖对无乳链球菌感染的独特治疗作用;使用含有不同浓度岩藻糖基化人乳低聚糖的培养基对无乳链球菌进行培养,研究岩藻糖基化人乳低聚糖抑制无乳链球菌的最佳浓度;分别使用岩藻糖基化人乳低聚糖或酸性人乳低聚糖加入培养基中对无乳链球菌、大肠埃希菌、肺炎克雷伯菌进行培养,进一步探讨岩藻糖基化人乳低聚糖对无乳链球菌的独特抑制作用。结果无乳链球菌肺炎患儿,母乳喂养组的住院时间较人工喂养组住院时间减少[(8.35±0.77)d vs(10.91±0.54)d,t=1.557 676,P<0.05)],PCT值较人工喂养组低[(2.38±0.63)ng/mL vs(8.69±2.23)ng/mL,t=1.419 964,P<0.05],白细胞计数较人工喂养组低[(13.28±1.08)×10^9/L vs(16.16±0.98)×10^9/L,t=1.878 447,P<0.05],脑膜炎发生率较人工喂养组低(5%vs 35%,χ^2=5.601 353,P<0.05),呼吸机使用率较人工喂养组低(10.0%vs 36.4%,χ^2=4.005 042,P<0.05);大肠埃希菌肺炎患儿、肺炎克雷伯菌肺炎患儿,母乳喂养组与人工喂养组比较,住院时间稍减少,PCT值、白细胞计数、脑膜炎发生率和呼吸机使用率均有所降低,差异无统计学意义;细菌培养实验发现岩藻糖基化人乳低聚糖在2.5 mg/L浓度的时候可以明显抑制无乳链球菌的生长,对大肠埃希菌和肺炎克雷伯菌无明显抑制作用,酸性人乳低聚糖对3种细菌均无抑制作用。结论岩藻糖基化人乳低聚糖可以明显抑制无乳链球菌的生长,可能成为未来无乳链球菌感染性肺炎治疗中新的靶点,值得深入研究。     

甘薯提取物对谷氨酸所致PC12细胞损伤的保护作用初探

观察甘薯提取物对谷氨酸诱导的PC12细胞损伤的保护作用.将大鼠嗜铬细胞瘤细胞(PC12)分为空白对照组、模型组、甘薯提取物0.1、1.0、10.0 μg/mL低、中、高剂量组和1.0 μmol/L尼莫地平阳性药物对照组,用2.0 mmol/L谷氨酸造成PC12细胞损伤,MTT法测定损伤细胞的存活率,观察其细胞损伤的形态学变化,考察甘薯提取物对谷氨酸所致PC12细胞损伤的保护作用.结果表明甘薯提取物可明显提高谷氨酸诱导的PC12损伤细胞存活率,同时能够明显改善谷氨酸诱导的PC12损伤细胞的细胞形态变化,并呈现剂量相关性,具有一定的神经营养及保护作用.     

黑木耳中抑制胰脂肪酶活性物质的提取工艺及体外抑制效果

本文以黑木耳醇提物和水提物为研究对象,以对胰脂肪酶活性的抑制率为指标,分别对其提取工艺进行了单因素和正交试验,选取优化后抑制率高的提取物进行抑制类型和3T3-L1前脂肪细胞方面的研究。结果表明醇提物的最佳提取工艺为提取温度70℃、提取时间1h、乙醇浓度90%、料液比1:20,抑制胰脂肪酶的IC₅₀=681.56μg/mL。水提物的最佳提取工艺为提取温度70℃、提取时间2h、料液比1:40,抑制胰脂肪酶的IC₅₀=850.59μg/mL,醇提物的抑制效果优于水提物。醇提物对胰脂肪酶的抑制类型为非竞争性抑制,抑制常数为4.69mg/mL;醇提物浓度低于1mg/mL时,对3T3-L1前脂肪细胞的活性无影响;浓度高于400μg/mL时即可显著抑制前脂肪细胞的分化。     

菜籽饼提取物抑制黑色素生成作用

为了研究菜籽饼提取物对黑色素合成的抑制作用,为菜籽饼提取物作为美白化妆品的天然添加剂提供实验依据。采用ABTS法、DPPH法检测菜籽饼提取物清除自由基的能力,测定A-375黑色素细胞中酪氨酸酶活性和黑色素含量,并利用各自的试剂盒检测A-375细胞中抗氧化相关因子(MDA, SOD, GSH)。研究结果表明:菜籽饼提取物具有清除DPPH和ABTS的能力,对DPPH和ABTS的半数抑制率分别为304μg/mL和305.8μg/mL。菜籽饼提取物具有显著的抑制A-375黑色素的作用,药物作用48 h后,其IC50为113.3μg/m L,同时能够显著的降低黑色素的含量和酪氨酸酶的活性。与空白对照组(17.66 mol/ng)相比,菜籽饼提取物能显著降低A-375细胞内MDA含量,其抑制率为9.21 mol/ng,且能够显著提高SOD的含量,当浓度为125μg/m L时,SOD的含量较空白对照组提高了36.54 U/mL,与此同时,菜籽饼提取物亦能增加GSH的含量,当浓度为62.5μg/mL时,细胞中GSH的含量为6.43 mol/ng,其含量显著高于空白对照组。因此,菜籽饼提取物在降低黑色素含量、抑制酪氨酸酶活性的同时,也能够通过显著的抗氧化能力和清除自由基的能力,抑制A-375细胞中黑色素的生成。