大豆异黄酮对围绝经期大鼠子宫作用及机制研究

目的:研究不同剂量及大豆异黄酮(SI)对围绝经期大鼠子宫以及子宫雌激素受体亚型ERα、ERβ表达的影响,探讨SI对子宫的作用及机制。方法:设7月龄雌性SD大鼠为正常组,将11月龄雌性SD大鼠随机分为五组:模型组,己烯雌酚组和3个SI给药组(分别灌胃SI30、12、4.6mg/kg·d),35d后,HE染色、扫描电镜观察子宫内膜形态,放射免疫检测血清雌二醇(E2)、卵泡刺激素(FSH)、黄体生成素(LH)、睾酮(T)含量,免疫组化观察SI对子宫ERα,ERβ表达的影响。结果:低剂量SI可提高11月龄大鼠血清雌二醇水平而高剂量SI组雌二醇水平明显低于7月龄正常组动物,各剂量SI均能促进子宫内膜腺体发育和内膜上皮无纤毛细胞上的微绒毛生长,无明显剂量依赖趋势。高剂量SI能明显提高围绝经期雌鼠子宫中降低的ERβ水平而对ERα无显著影响。结论:大豆异黄酮对围绝经期雌鼠子宫有雌激素样作用并且对ERβ表达具有调节作用。     

大豆异黄酮保健食品中苷及苷元的等度HPLC法测定

目的建立等度高效液相色谱法(HPLC)分离测定保健食品中大豆异黄酮三种苷及其苷元的方法.方法采用Inert-silODS-3(4.6 mmx150 mm,5 μm)色谱柱,以1.5%乙酸-甲醇-乙腈(7022.57.5)为流动相等度洗脱,检测波长260 nm,柱温55℃,流速1.2 mL·min-1.样品用70%的乙醇超声提取,经0.45 μm滤膜过滤后进样.结果HPLC过程于30 min左右完成,大豆苷和黄豆苷的分离度为0.9以上,余者分离度均大于1.5.对4种市售保健食品作了分析.结论方法简便、快速、准确,为含大豆异黄酮的保健食品含量测定及质量控制提供了较为理想的方法.     

Soy-based formulas and phyto-oestrogens: a safety profile

Phyto-oestrogens are non-steroidal plant-derived compounds that possess oestrogenic activity and act as selective oestrogen receptor modulators (SERMs). Among the dietary oestrogens, the isoflavone class enjoy a wide-spread distribution in most of the members of the Leguminosae family, including such prominent high-content representatives as soybean. Phyto-oestrogen research has grown rapidly in recent years owing to epidemiological studies suggesting that diets rich in soy may be associated with potential health benefits. There is a paucity of data on endocrine effects of soy phytochemicals during infancy, the most sensitive period of life for the induction of toxicity. The safety of isoflavones in infant formulas has been questioned recently owing to reports of possible hormonal effects. Infants fed soy formula receive high levels of phyto-oestrogens in the form of isoflavones (genistein, daidzein and their glycosides). To date, no adverse effects of short- or long-term use of soy proteins have been observed in humans and exposure to soy-based infant formulas does not appear to lead to different reproductive outcomes than exposure to cow milk formulas. Soy formula seems to be a safe feeding option for most infants. Nevertheless, much closer studies in experimental animals and human populations exposed to phyto-oestrogen-containing products, and particularly soy-based infant formulas, are necessary.     

海洋碳样小单孢菌产生的大豆黄素和染料木素

目的研究海洋微生物FIM02—635产生的活性次级代谢产物。方法对产生菌进行分类鉴定。发酵液用有机溶媒提取具有免疫抑制活性的化合物，采用硅胶柱层析及高速逆流色谱的分离方法，提取纯化到2个化合物FW63511和FW63512，通过理化性质测定和光谱学测定分析2个化合物的结构并对这两个化合物进行体外生物活性测定。结果与结论产生菌定名为碳样小单孢菌FIM02—635。FW63511和FW63512分别与异黄酮大豆黄素和染料木素同质，它们具有免疫抑制和抗肿瘤活性，但没有抗菌活性。     

异黄酮活性成分对Aβ_(1-42)诱导的PC12细胞损伤的保护作用

目的探讨异黄酮活性成分对β淀粉样蛋白(Aβ1-42)诱导的PC12细胞损伤的保护作用。方法从大豆中提取纯化异黄酮活性成分,以Aβ1-42诱导PC12细胞损伤为细胞模型,采用细胞形态学方法、MTT法、LDH法观察不同剂量的异黄酮活性成分对PC12细胞损伤的保护作用。结果异黄酮活性成分能有效地改善PC12细胞的形态,提高细胞存活率(P<0.05),保护组LDH活性低于损伤组(P<0.05)。结论大豆异黄酮活性成分对Aβ1-42诱导的PC12细胞损伤具有显著的保护作用。     

大豆异黄酮抗血小板聚集作用的实验研究

[目的 ]研究大豆异黄酮对血小板聚集性的影响 .[方法 ]普通饲料中添加 2 0 g/kg大豆异黄酮混合物 ,饲喂GK/Jcl糖尿病大鼠 2 0周 ,测定其血小板聚集率 .利用ODS柱层析和高效液相色谱技术分离大豆异黄酮 ,体外观察大豆异黄酮单体对人血小板聚集率的影响 .[结果 ]长期食用大豆异黄酮的GK/Jcl糖尿病大鼠血小板聚集率显著降低 .在人体外血小板聚集实验中 ,大豆异黄酮均抑制腺嘌呤核苷二磷酸钠、胶原蛋白和肾上腺素诱导的血小板聚集 ,大豆异黄酮类型中金雀异黄素的最强 ,其 5 0 %抑制浓度值分别为 0 38,0 30 ,0 2 3mmol/L .[结论 ]大豆异黄酮具有血小板聚集抑制效应 ,在大豆抗血小板聚集中起着重要作用 .     

基于UPLC-Q-TOF-MS/MS技术快速鉴定降香中化学成分

目的:降香为我国传统名贵中药材,然目前市场上降香来源品种复杂,质量差异较大,为进一步明确其药效物质基础,采用超高效液相色谱-串联四极杆飞行时间高分辨率质谱(UPLC-Q-TOF-MS/MS)技术快速分析降香甲醇提取物中的化学成分。方法:采用UPLC RRHD SB-C18色谱柱(3.0 mm×100 mm,1.8μm),以0.1%甲酸水溶液-乙腈为流动相进行梯度洗脱,流速0.3 mL·min^-1,柱温40℃;采用电喷雾离子源,负离子模式采集数据。结果:通过一级精确荷质比和二级碎片信息数据,结合文献资料,质谱裂解规律,Mass bank质谱数据库及对照品的保留时间等,从降香的甲醇提取物中初步鉴定83个化学成分,包括18个黄酮类,31个异黄酮类,10个新黄酮类,9个异黄烷类,7个其他类型黄酮和8个其他类成分。结论:UPLCQ-TOF-MS/MS技术方法可快捷、准确、较全面地鉴定降香甲醇提取物中的化学成分,降香的主要化学成分为异黄酮、黄酮、新黄酮、异黄烷等黄酮类,为降香的药效物质基础研究奠定基础,也为降香药材的质量标准提升提供理论依据和技术支持。     

红三叶草异黄酮及其代谢研究进展

红三叶草异黄酮具有多种生理活性,从其结构特点上阐述了红三叶草异黄酮的植物雌激素功能。近年来国内外学者对其生理功能的研究发现,红三叶草异黄酮的植物雌激素作用与其代谢产物密切相关。红三叶草异黄酮属于4’-甲氧基类异黄酮,需要在生物体内通过微生物酶系作用下转化成具有双羟基结构以及活性更高的4’-羟基类异黄酮,从而能够更好地与雌激素受体结合,发挥植物雌激素作用。     

大豆异黄酮心血管作用的研究进展

异黄酮是一类具有雌激素样作用的生物活性物质。大豆中的异黄酮主要有两种形式：染料木黄酮和黄豆苷原。近年来发现，大豆异黄酮具有较强的扰动脉粥样硬化和舒血管效应，影响细胞增殖和新生血管的形成，对心血管有保护和调节作用。     

Soy Isoflavone Glycitin (4'‐Hydroxy‐6‐Methoxyisoflavone‐7‐D‐Glucoside) Promotes Human Dermal Fibroblast Cell Proliferation and Migration via TGF‐β Signaling

Glycitin is a soy isoflavone that exhibits antioxidant, antiallergic, and anti‐osteoporosis activities. We investigated the effects of glycitin on dermal fibroblast proliferation and migration. Treatment of primary dermal fibroblasts with glycitin increased cell proliferation and migration. In addition, treatment with 20 μM glycitin for 24 h induced the synthesis of collagen type I and type III at both the mRNA and protein levels. Fibronectin was also increased by 20% after treatment. Matrix metalloproteinase‐1 collagenase was decreased in the media after 24‐h incubation with glycitin, and the synthesis of transforming growth factor‐beta (TGF‐β) mRNA increased approximately twofold in cells following glycitin treatment. Phosphorylation of Smad2 and Smad3 increased after 1 h of glycitin treatment, and phosphorylation continued for 24 h. Furthermore, the phosphorylated form of AKT was increased in glycitin‐treated cells after 3 h and remained higher for 24 h. Thus, glycitin treatment produces anti‐aging effects including increased total collagen in the culture media, decreased elastase, and decreased β‐galactosidase. Together, these results indicate that glycitin stimulates TGF‐β secretion, and the subsequent autocrine actions of TGF‐β induce proliferation of fibroblasts, ultimately protecting skin cells from aging and wrinkling. Copyright © 2015 John Wiley & Sons, Ltd.