文蛤糖肽MGP0501的分离纯化及性质鉴定

文蛤粗提液经超滤、层析等纯化得到分子量为15.878×103、纯度为96.42%、糖和蛋白质含量各占约55.18%和44.82%的糖肽MGP0501。MTT法和流式细胞术检测证实MGP0501对A549细胞具有体外抗肿瘤活性,对小鼠移植瘤S180的体内抗肿瘤实验检测亦证实其对小鼠移植瘤S180具有体内抑制作用,表明MGP0501是一种具有抗肿瘤作用的糖肽。     

唾液酸糖肽的研究进展

唾液酸糖肽(SGP)是一种含有唾液酸寡糖链的N-糖肽,是蛋黄中的主要组成部分。由于其分支型糖链的结构和唾液酸化糖链的存在,SGP及其相关物质有较好的抗细菌和抗病毒作用。以SGP为基础合成SGP的衍生物,有望成为新的预防性抗细菌和抗病毒药物。我们简要综述了SGP的抗菌、抗病毒研究,SGP相关衍生物的合成及其抗菌、抗病毒的机制。     

酸奶中糖肽复合物的分离纯化

对酸奶中的肽类物质进行了提取、纯化和初步分析,认为该肽类成分是一种糖肽复合物。     

白藜芦醇的生物活性及作用机制

白藜芦醇(RSV)是一种广泛存在的非黄酮类多酚化合物,具有抗氧化、抗炎、抗菌、抗病毒以及调节细胞代谢等多种生物学功能,目前在人体健康领域和动物生产中具有广泛的应用。本文简要综述了RSV的来源及理化性质、生物利用率、生物活性及其作用机制,为RSV的深入研究和进一步开发应用提供参考依据。     

超支化聚合物新材料富集糖肽方法的研究

目的：将自合成的超支化聚合物固定到氨基硅球上形成一种新型的糖肽富集材料,用于糖肽的高效分离与富集。方法：阴离子开环聚合法合成的超支化聚缩水甘油,经高碘酸氧化成为超支化聚甘油醛（hyperbranched polyglycerol-aldehydes,HPG-ALD）后固定于氨基硅球上,再用己二酸二酰肼修饰得到的酰肼材料应用于糖肽富集。结果：经扫描电镜（Scanning Electron Microscope,SEM）、热重分析（thermogravimetric analysis,TGA）等手段证明材料被成功合成。同时,使用制备成功的新材料来富集标准糖蛋白和糖肽都获得了良好的富集效果。结论：实验证明超支化缩水甘油酰肼材料（hyperpolymer-assisted hydrazide functionalized microspheres,HHMs）可用于低丰度糖蛋白/糖肽的富集。     

云芝糖肽的液体发酵培养基的研究

通过液体发酵的摇瓶实验,考察碳源、氮源、碳氮比和乙醇浓度对云芝糖肽的产率影响,确定葡萄糖和玉米淀粉为适宜碳源,蛋白胨和黄豆饼粉为适宜氮源,合适的碳氮比为20∶1,适宜的乙醇体积分数为1.5%。采用以上的培养基进行70 L发酵罐进行扩大实验和10 t工业生产规模试验。发酵周期32 h,最终生物量达到13.0 g/L,云芝糖肽产率平均为2.21 g/L,与摇瓶发酵水平相当。此外工业实验还确定了云芝液体发酵的pH值、残糖浓度以及菌丝体形态等终点指标。     

酸浆的化学成分及药理作用研究进展

酸浆为茄科多年生草本植物,资源丰富,应用广泛。迄今已从酸浆中分离鉴定出159种化合物,可分为类固醇类、黄酮类、苯丙素类、含氮化合物等。借助现代药理学研究手段,酸浆广泛的药理活性被陆续发现,其可发挥抗炎、抗菌、抗氧化、抗肿瘤等功效,同时在抗糖尿病、抗衰老、抗肥胖以及调节肠道菌群平衡等方面也发挥着重要的作用。本文主要对酸浆化学成分及药理作用的研究进展进行综述,以期为酸浆的合理开发和综合应用提供科学依据。     

蕲蛇提取物抗炎镇痛药理作用的研究

目的 研究蕲蛇提取物的抗炎及镇痛作用,为蕲蛇的临床应用提供科学依据.方法 采用热板法、冰醋酸刺激致痛法研究蕲蛇提取物对小鼠痛阈的影响,利用二甲苯致小鼠耳廓炎症模型和腹腔染料渗出法测定蕲蛇提取物的抗炎作用.结果 蕲蛇提取物醇溶性和水溶性部位对小鼠热板及冰醋酸致痛反应有明显镇痛作用,对二甲苯致小鼠耳廓肿胀、冰醋酸致腹腔毛细血管通透性增高均有明显的抑制作用.结论 蕲蛇提取物醇溶性和水溶性部位有一定的抗炎及镇痛作用,并且水溶性部位较醇溶性部位的药效好,可为蕲蛇的临床应用提供指导作用.     

N-糖肽的规模化质谱解析方法进展

蛋白质糖基化修饰的鉴定是蛋白质翻译后修饰分析中最具挑战性的任务之一,近几年尤其受到关注.快速发展的质谱技术为规模化的蛋白质糖基化修饰研究提供了有效的手段.与其他基于质谱技术的翻译后修饰鉴定相比,糖基化鉴定的难点在于糖链是大分子而且存在微观不均一性,另外糖链本身可以在串联质谱中碎裂且与肽段的碎裂规律不同,导致蛋白质组学的质谱解析方法和软件难以完整地鉴定肽段序列和糖链结构.完整N-糖肽的鉴定是糖基化分析的热点内容之一,针对N-糖肽的鉴定,近年来,人们开发了多种多样的质谱解析方法,其中包括用N-糖酰胺酶切除糖链后鉴定N-糖基化位点的方法、基于电子转运裂解的糖肽肽段鉴定、基于高能碰撞裂解与电子转运裂解联用或碰撞诱导裂解与三级谱联用的完整N-糖肽鉴定等等.本文对这些质谱解析方法进行了整理和综述,简要指出了目前完整糖肽鉴定软件存在的一些不足,展望了未来的发展方向.     

Eradication of Helicobacter pylori does not reduce the incidence of gastroduodenal ulcers in patients on long-term NSAID treatment: double-blind, randomized, placebo-controlled trial

BACKGROUND: Helicobacter pylori and nonsteroidal antiinflammatory drugs (NSAIDs) are the major causes of gastroduodenal ulcers. Studies on the benefit of eradication of H. pylori in NSAID users yielded conflicting results. OBJECTIVE: To investigate whether H. pylori eradication in patients on long-term NSAIDs reduces the incidence of gastroduodenal ulcers. METHODS: Patients on long-term NSAID treatment and who are H. pylori positive on serologic testing, were randomly assigned to either H. pylori eradication (omeprazole, amoxicillin, and clarithromycin) or placebo. Primary endpoint was the presence of endoscopic gastric or duodenal ulcers 3 months after randomization. RESULTS: One hundred sixty-five (48%) of a total of 347 patients were on gastroprotective medication. At endoscopy, gastroduodenal ulcers were diagnosed in 6 (4%) and 8 (5%) patients in the eradication and placebo group, respectively (p = .65). During follow-up of 12 months, no symptomatic ulcers or ulcer complications developed. No significant differences were found in the development of gastroduodenal erosions, dyspepsia, or in quality of life. CONCLUSION: H. pylori eradication therapy in patients on long-term NSAID treatment had no beneficial effect on the occurrence of ulcers, erosions, or dyspepsia. Ulcer rates in both study arms are remarkably low, in both patients with and without gastroprotective therapy.     

Licorice: A possible anti-inflammatory and anti-ulcer drug

The purpose of this investigation was to study the anti-inflammatory activities of both glycerrhitinic acid (GA) and the aqueous licorice extract (ALE) in comparison with diclofenac sodium (DS) (10 mg/kg), using the carrageenan-induced paw edema model in male albino rats. In addition, the anti-ulcer activities of ALE, famotidine (FT), and a combination of ALE and FT using indomethacin-induced ulceration technique in rat stomach were investigated. Conventional DS tablets containing GA, as well as DS chewable tablets containing either GA or ALE with different tastes were prepared. Also, rapidly disintegrating FT tablets were prepared using direct compression and camphor sublimation methods. ALE or GA produced significant anti-inflammatory activity similar to DS, and when taken concomitantly, there is no possible antagonism. The anti-ulcer activity of licorice was found to be similar to that of FT in indomethacin-induced ulceration technique in rat stomach. Combination therapy of both FT and licorice showed higher anti-ulcer activity than either of them alone. Generally, tablets containing the crosslinked sodium carboxymethyl cellulose (AcDisol) showed more rapidly disintegrating effect than those including Sodium starch glycolate (Primojel). The oral disintegration was very rapid for all the tested formulations. Also, the amount of FT absorbed from the oral cavity was nearly 9 from 10 mg theoretically present in each formula. It could be concluded that both GA and ALE have anti-inflammatory activity comparable with DS. It may be recommended to add ALE to either FT or diclofinac for more effective anti-inflammatory or anti-ulcer formulations, respectively.     

Brazilian Red Propolis Accelerates Gastric Healing and Reduces Gastric Submucosal Layer Inflammation in Ultrasound-Monitored Rats

Propolis has been used for the treatment of gastric disturbances in folk medicine, nevertheless, the gastric healing effects of Brazilian red propolis have not been unveiled. This study aimed to assess the gastric healing effect of the hydroalcoholic extract of red propolis (HERP) in the acetic acid-induced ulcer model. Rats under acetic acid-induced-ulcer were treated with HERP (100 mg/kg, p.o.) twice a day for seven days. Histological changes, oxidative stress, and inflammatory parameters were analyzed in the gastric tissue. Moreover, the gastric wall thickness was measured by ultrasound. The in vitro cytotoxicity of HERP and cellular migration of fibroblasts were evaluated. The treatment with HERP promoted gastric healing, reducing gastric wall thickness, macroscopic lesion area, and histopathological damages compared to the vehicle. Moreover, HERP reduced oxidative stress and inflammation in the gastric tissue but did not change mucin or collagen levels. HERP did not show signs of toxicity either in vivo or in vitro. HERP displayed a healing effect in vivo by reducing oxidative stress and inflammation. These data contribute to validating the popular use of this product in the treatment of gastric disorders and advance scientific knowledge in the search for new drugs for the management of gastric ulcers.     

Analgesic,anti-inflammatory and anti-ulcer properties of Thai Perilla frutescence fruit oil in animals

Perilla frutescens fruit oil (PFO) is rich in α-linolenic acid (ALA) and exhibits biological activities. We aimed to investigate analgesic, anti-inflammatory and anti-ulcer activities of PFO and PFO-supplemented soybean milk (PFO-SM) in animal models. Analgesic activity was assessed in acetic acid-induced writhing in mice, while anti-inflammatory activity was performed in ethyl phenylpropiolate (EPP)-induced ear edema and carrageenan-induced hind paw edema in rats. Anti-ulcer effects were conducted in water immersion stress, HCl/ethanol and indomethacin-induced gastric ulcer in rats. Distinctly, PFO, containing 6.96 mg ALA and 2.61 mg LA equivalence/g, did not induce acute toxicity (LD₅₀ > 10 mL/kg) in mice. PFO (2.5 and 5 mL/kg) and PFO-SM (0.05 mL PFO equivalence/kg) inhibited incidences of writhing (16.8, 18.0 and 32.3%, respectively) in acetic acid-induced mice. In addition, topical applications of PFO (0.1 and 1 mL/ear) significantly inhibited EPP-induced ear edema (59.3 and 65.7%, respectively) in rats, while PFO-SM slightly inhibited ear edema (25.9%). However, PFO and PFO-SM did not inhibit carrageenan-induced hind paw edema in rats. Indeed, PFO (2.5 and 5 mL/kg) significantly inhibited gastric ulcers in rats that induced by water immersion stress (92.4 and 96.6%, respectively), HCl/ethanol (74.8 and 73.3%, respectively) and indomethacin (68.8 and 88.9%, respectively), while PFO-SM did not. PFO displayed potent analgesic, anti-inflammatory and anti-ulcer properties, while PFO-SM exerted only analgesic properties. Thus, Thai PFO and its functional drink offer potential benefits in treatment of analgesic, inflammatory diseases and gastric ulcer.     

树脂酸及其衍生物的生物活性

树脂酸是松香的主要组分,在工业上具有广泛的应用。近年来,研究表明树脂酸及其衍生物具有重要的生物学功能,包括抗氧化、消炎等活性。本文综述了这些化合物的生物活性。