大鼠实验性胃溃疡自愈期间肠嗜铬样细胞的变化

目的:探讨肠嗜铬样细胞与大鼠实验性胃溃疡自愈的关系. 方法:通过制备大鼠乙酸性胃体溃疡模型,采用免疫组化、逆转录聚合酶链反应(RT-PCR)和放射免疫测定的方法,观察溃疡自愈过程中大鼠胃黏膜内ECL细胞形态、组氨酸脱羧酶(HDC)mRNA和组胺含量的变化. 结果:胃溃疡大鼠胃黏膜内HDC阳性细胞率和胞质平均灰度值在制模术后第1日即开始降低,术后第6日达到最低,随后开始回升,术后第12日基本正常. 胃黏膜内HDC mRNA表达在制模术后第1日开始降低,第3日最明显,第6日开始恢复,第9日后接近正常. 制模术后胃黏膜内组胺含量也出现下调,以术后第6日为最低. 结论:ECL细胞可通过减弱其合成组胺的功能,参与胃溃疡自愈的调节过程.     

Gastrointestinal hormone abnormalities and G and D cells in functional dyspepsia patients with gastric dysmotility

AIM: To investigate the relationship between gastric dysmotility, gastrointestinal hormone abnormalities, and neuroendocrine cells in gastrointestinal mucosa in patients with functional dyspepsia (FD). METHODS: Gastric emptying was assessed with solid radiopaque markers in 54 FD patients, and the patients were divided into two groups according to the results, one with delayed gastric emptying and the other with normal gastric emptying. Seventeen healthy volunteers acted as normal controls. Fasting and postprandial plasma levels and gastroduodenal mucosal levels of gastrointestinal hormones gastrin, somatostatin (SS) and neurotensin (NT) were measured by radioimmunoassay in all the subjects. G cells (gastrin-producing cells) and D cells (SS-producing cells) in gastric antral mucosa were immunostained with rabbit anti-gastrin polyclonal antibody and rabbit anti-SS polyclonal antibody, respectively, and analyzed quantitatively by computerized image analysis. RESULTS: The postprandial plasma gastrin levels, the fasting and postprandial plasma levels and the gastric and duodenal mucosal levels of NT were significantly higher in the FD patients with delayed gastric emptying than in those with normal gastric emptying and normal controls. The number and gray value of G and D cells and the G cell/D cell number ratio did not differ significantly between normal controls and the FD patients with or without delayed gastric emptying. CONCLUSION: Our findings suggest that the abnormalities of gastrin and NT may play a role in the pathophysiology of gastric dysmotility in FD patients, and the abnormality of postprandial plasma gastrin levels in FD patients with delayed gastric emptying is not related to the changes both in the number and gray value of G cells and in the G cell/D cell number ratio in gastric antral mucosa.     

Paeonol ameliorates CFA-induced inflammatory pain by inhibiting HMGB1/TLR4/NF-κB p65 pathway

Metabolic Brain Disease - The enhanced release of inflammatory cytokines mediated by high mobility group box1 (HMGB1) leads to pain sensation, and has been implicated in the etiology of...     

A nano silicon adjuvant enhances inactivated transmissible gastroenteritis vaccine through activation the Toll-like receptors and promotes humoral and cellular immune responses

Inactivated transmissible gastroenteritis virus (TGEV) vaccines are widely used in swine herds in China. These are limited, however, by the need to elicit both humoral and cellular immunity, as well as the efficiency of adjuvants. In this study, a 70-nm nano silicon particle was applied with inactivated TGEV vaccine in mice, and its immune-enhancing effects and mechanism of action investigated. We found that nano silicon applied with inactivated TGEV vaccine induced high antibody titers, increase IL-6, TNF-α and IFN-γ expression, and stimulate CD3+ T cell proliferation with a high CD4+/CD8+ T lymphocyte ratio. Nano silicon could quickly activate innate and adaptive immunity by stimulating Toll-like receptor signaling pathways, indicating that the nano silicon adjuvant enhanced long-term humoral and early cellular immune responses when combined with inactivated TGEV vaccine. Nano silicon could be considered for use as an antigen- carrier and adjuvant for veterinary vaccines.     

桑寄生化学成分的研究广寄生叶中d-儿茶素及檞皮甙的分离和鉴定

桑寄生为常用中药,广寄生(Taxillus Chinensis(DC.)Danser)为桑寄生主流品种之一,中国药典各版均有收载。据文献报道叶中含广寄生甙(Avicullarin)及檞皮素(Quercetin)。作者从叶中分得二种结晶,理化鉴定及光谱分析证明晶Ⅰ为d-儿茶素(d-Catechin),晶Ⅱ为檞皮甙(Quercitrin),收率分别为0.013％和0.14％。为进一步考察广寄生叶中黄酮成分的组成,取夏季、冬季采收的广寄生及两种市售的寄生茶作叶的总黄丽层折鉴定,用檞皮甙、广寄生甙、d-儿茶素、槲皮素纯品对照,结果均含以上成分,但以檞皮甙为主,广寄生甙含量很低。     

载脂蛋白E基因多态性与早发性阿尔茨海默病的相关性

目的：探讨载脂蛋白E（ApoE）基因多态性与早发性阿尔茨海默病（EOAD）的相关性。方法：用扩增抗拒突变系统法检测103例EOAD患者、159例迟发性阿尔茨海默病（LOAD）患者和118例认知功能正常对照（Nc）者的ApoE基因多态性,分析其与EOAD患病的相关性。结果：EOAD组ApoE等位基因和基因型分布频率与正常对照组差异有显著统计学意义,与LOAD组差异无统计学意义;Logisfc回归证实携带ApoEg4与EOAD有显著相关性;ε4等位基因拷贝数的增加,可显著提高EOAD的患病率,但不影响EOAD的发病年龄。结论：ApoEg4是EOAD的独立危险因素,可显著增加EOAD的患病率。     

Electron microscopic observation of endocrine cells in the antrum in response to Helicobacter pylori infection.]

OBJECTIVE: To observe the ultrastructural changes of the endocrine cells in the antrum after the onset of Helicobacter pylori (Hp) infection. METHODS: Seven patients with chronic gastritis were included in this study, and toluidine blue staining and rapid urease test were performed to determine the Hp status of the gastric antral mucosa biopsies. Five patients identified as being positive for Hp constituted the test group, leaving the 2 Hp-negative patients serving as control. The endocrine cells in the antrum of the patients were sampled to observe the ultrastructural changes by transmission electron microscopy (TEM). RESULTS: TEM showed increased electron density of the secretion granules in the endocrine cells, and secretions in the parietal cells were active. CONCLUSION: The ultrastructural changes of the endocrine cells in the antrum might explain high gastrin levels after the onset of Hp infection.     

丝胶对2型糖尿病大鼠血糖和血脂的影响

目的观察丝胶对2型糖尿病大鼠血糖(BG)和血脂的影响。方法采用腹腔注射链脲佐菌素(STZ)建立糖尿病动物模型。60只SD大鼠随机分为正常对照组、糖尿病模型组、丝胶预防组、丝胶治疗组和二甲双胍治疗组。丝胶治疗组和二甲双胍治疗组大鼠分别给予丝胶(2.4 g.kg-1.d-1)和二甲双胍(55.33 mg.kg-1.d-1)灌胃,丝胶预防组大鼠于造模前给予同等剂量丝胶灌胃。分别检测各组大鼠的BG,血甘油三酯(TG)、总胆固醇(TC)、高密度脂蛋白(HDL-C)和低密度脂蛋白(LDL-C)。结果与正常对照组相比,糖尿病模型组大鼠BG、TG、TC、LDL-C明显升高(P<0.01),HDL-C明显降低(P<0.05)。与糖尿病模型组相比,丝胶治疗组、二甲双胍治疗组和丝胶预防组大鼠的BG、TG、TC和LDL-C明显降低,HDL-C明显升高(P<0.01),且丝胶治疗组与二甲双胍治疗组比较无明显差异(P>0.05)。结论丝胶对糖尿病BG升高和血脂代谢紊乱具有良好的治疗及预防作用。