Effect of dietary protein on Masheri-induced drug metabolising enzymes

The modulation of drug metabolising enzymes by Masheri extract (ME) and Benzo(a)Pyrene [B(a)P] was studied in male Sprague Dawley rats fed different dietary protein levels. Two groups of 21 days old male Sprague Dawley rats were put on a high protein diet (SHP) with 20% Casein, and a low protein diet (SLP) with 3% Casein semisynthetic based diets for 12 weeks. The SLP fed animals showed lower basal levels of the Phase I activating enzymes viz. Cytochrome P450, Benzo(a)Pyrene hydroxylase, Benzphetamine demethylase and Phase II glutathione detoxification system viz. Glutathione (GSH) and Glutathione-S-transferase. ME and B(a)P treatment significantly depleted the glutathione detoxification system in the SLP group whereas an opposite effect was observed in the SHP group. Interstingly, ME and B(a)P treated rats in the SLP group showed a higher percent increase in the hepatic and pulmonary Phase I enzyme activities than those observed in the treated ME/B(a)P treated SHP rats. Furthermore, both ME and B(a)P significantly decreased the hepatic pool of vitamin A while a concomittant increase in that of vitamin C was observed.     

CD117阳性小肠间质瘤中Ki67和p53蛋白的表达及在预后中的意义

目的 :研究小肠间质瘤 (smallbowelstromaltumors,SBST)Ki6 7和p5 3免疫组织化学的表达 ,探讨两者在肿瘤良恶性划分和预后中的作用。方法 :选用CD117阳性的SBST 33例进行光镜观察 ,用EnVisionTM+二步法免疫组化方法检测Ki6 7和 p5 3蛋白在肿瘤中的表达情况并与形态学进行比较。 结果 :33例SBST患者 ,男 2 0例 ,女13例 ,年龄 2 1～ 71岁 ,发生于十二指肠 5例 ,空肠 2 2例 ,回肠 6例。肿瘤最大径的范围在 1.5～ 2 0cm之间。在光镜下出现肿瘤内坏死的有 11例。肿瘤核分裂象计数每 5 0个高倍镜视野 0个有 6例 ,1～ 2个 5例 ,≥ 3个的有 2 2例。 33例中良性 4例 ,交界性 4例 ,恶性 2 5例。随访时间为 3～ 180个月 (平均 73.3个月 ) ,结果为良性组 4例均无瘤生存 ;交界性组 2例无瘤生存 ,1例失访 ,1例在无瘤生存 18个月后失访 ;恶性组无瘤生存有 7例 ,带瘤生存者及死亡有 16例 ,2例失访。Ki6 7染色阴性 2例 ,均为良性 ;其余 31例阳性中 ,增殖指数 (阳性细胞数 )大于 5 %的有恶性 16例 (94 .1% ) ,交界性 1例。在免疫组化p5 3染色中 ,恶性组 2 5例均呈阳性表达 (平均阳性细胞数 4 2 .9% ) ,其中 12例阳性细胞数大于 5 0 %。当Ki6 7和 p5 3均为阴性或两者阳性细胞数分别是 <1%和 <10 %时 ,肿瘤呈良性经过 ,预后     

胃肠道肿瘤病人围手术期细胞因子及蛋白质代谢的变化

目的 :探讨胃肠道肿瘤病人手术后肿瘤坏死因子 α (TNF α)、白介素 6 (IL 6 )、白介素 10 (IL 10 )的变化以及与蛋白质代谢的关系。　方法 :用酶联免疫法 (ELISA)检测 19例胃肠道肿瘤根治术病人术前和术后 1、3、5天血清TNF α、IL 6和IL 10水平 ,同时检测蛋白质分解代谢相关指标、2 4h尿中尿素和肌酐排泄量。　结果 :胃肠道肿瘤根治术后病人TNF α呈下降趋势 ,术后第 1天较术前明显下降 (P <0 .0 5 )。IL 6和IL 10术后升高 (P <0 .0 1) ,尤以术后第 1天升高明显。术后 2 4h尿中尿素和肌酐排泄量明显升高。　结论 :胃肠道肿瘤根治术后病人IL 6和IL 10的升高支持手术应激导致的细胞因子释放变化 ,但TNF α呈下降趋势 ,可能与胃肠道肿瘤病人术前TNF α的高表达有关。术后蛋白质分解代谢增加 ,可能与细胞因子IL 6和IL 10的升高有关。     

Glucocorticoid regulation of eicosanoid production by glial cells under basal and stimulated conditions

We measured the production of two eicosanoids, prostaglandin E₂ and thromboxane-B₂, by rat glial cell cultures under basal conditions, following stimulation with phorbol-12-myristate-13-acetate and the bacterial endotoxin lipopolysaccharide, and following treatment with synthetic glucocorticoids. Stimulation of rat glial cells in culture with either phorbol-12-myristate-13-acetate or lipopolysaccharide caused a 1.5–5.0-fold increase in prostaglandin E₂ production, but did not affect thromboxane production. Pretreatment of the cultures with dexamethasone markedly inhibited the stimulated production of prostaglandin E₂ but had only a modest effect on basal production. Dexamethasone did not affect the activity of the enzyme protein kinase C, a putative regulator of eicosanoid synthesis. Our findings show that glucocorticoids have the potential to modulate central nervous system eicosanoid production particularly under conditions of stimulated production, such as inflammatory and demyelinating disorders. This mechanism may explain, at least in part, the therapeutic benefit of glucocorticoids in patients with multiple sclerosis.     

Fentanyl and the interleukin-6 response to surgery

It has been suggested that large doses of opioids may suppress the interleukin-6 response to surgery. We examined the effects of the supplementation of inhalational anaesthesia with either 3 or 15 μg.kg⁻¹ fentanyl on the circulating interleukin-6, interleukin-8, C-reactive protein, cortisol and glucose concentrations in 16 patients undergoing pelvic surgery. In both groups, surgery evoked the expected glucose, cortisol and interleukin-6 response but no increase in interleukin-8 was detected. There were no significant differences between the two groups. We conclude that the supplementation of inhalational anaesthesia with conventional doses of opioids does not modify the cytokine response to surgery.     

油菜和向日葵花粉的成分分析及其蛋白质营养评价

<正> 花粉在古代就曾作为强身保健食品。美、英两国的科学家曾分析了花粉的成分,发现花粉由96种元素组成,其中有维生素、矿物质、酶、蛋白质和某些其它物质。美国明尼苏达大学曾做过花粉对动物的增重实验。当41～150日龄小猪饲料中添加2～3％的玉米花粉时,体重增长明显快于对照组,     

SP-C对重组肺表面活性物质活性的影响

目的 探讨不同浓度的肺表面活性物质(PS)相关蛋白C(SP-C)与合成脂质构成的重组PS活性的变化。方法 从新鲜猪肺的灌洗液中提取PS,从PS中分离出SP-C。将二棕榈酰磷脂酰胆碱、二油酰磷脂酰胆碱和棕榈酰油酰磷脂酰甘油按60:20:20的重量比混合,即为合成脂质(SL),将SP-C按1％、2％、3％(与脂质的重量比)加入SL中,制成三种重组PS:RS-1、RS-2和RS-3。将上述物质溶于生理盐水中即为实验液体。用气泡型表面张力计测定各实验液体的表面张力。将PS缺如的未成熟胎兔随机分为4组:PS、SL、RS-3和对照组。分别向PS、SL和RS-3组气道内注入PS、SL、RS-3液;对照组未注入任何物质。然后进行人工通气,通气后5、10、15、20min测定各组潮气量。结果 PS的最小表面张力(γmin)为(0.9±0.3)mN/m,SL的γmin为(22.6±1.3)mN/m,明显高于PS(P<0.01);随SP-C浓度的增加γmin逐渐降低,RS-3的γmin降至(0.7±0.1)mN/m(与PS相比,P>0.05)。通气20min时,PS组、RS-3动物的潮气量分别达到(25±7)ml/kg、(25±4)ml/kg,明显高于对照组和SL组(P<0.01)。结论 不含SP-C的合成脂质表面活性低,加入SP-C后构成的重组PS表面活性明显增强。     

大肠癌手术治疗前后血清蛋白质谱的变化

目的观察大肠癌手术前后血清蛋白质谱的变化,从而筛选特异性蛋白标志物。方法选用IMAC#3蛋白质芯片和SELDITOF蛋白质芯片技术,对64例大肠癌患者和40名正常人的血清蛋白质谱进行分析。结果通过对大肠癌术前血清与正常人血清蛋白质谱分析发现共有19个蛋白质表达量有明显差异。并获得分子量为5908.55Da等5个蛋白质组成的模板,可将大肠癌与正常人正确分组,其正确分组率分别为97.5%(56/64)和80.0%(32/40)。术后血清蛋白质谱中,原高表达的蛋白质明显下调。利用该模板诊断大肠癌的灵敏度达96.8%,特异性达92.5%。结论血清中可以筛选到诊断大肠癌的特异性蛋白标志物并用以预后的判断。SELDITOF蛋白质芯片技术为建立蛋白质模板用以早期诊断大肠癌提供了可靠的技术平台。     

乳腺癌组织P21WAF1基因多态性与蛋白表达的关系

目的 :探讨乳腺癌组织p2 1WAF1DNA多态性与蛋白表达的关系。方法 :分别采用聚合酶链反应单链构象多态性技术 (PCR -SSCP)和免疫组化S -P法检测 10 0例乳腺癌石蜡包埋组织和 4 0例乳腺良性病变组织p2 1WAF1DNA多态性和蛋白表达。结果 :18% (18/ 10 0 )的乳腺癌组织和 5 % (2 / 4 0 )对照组组织分别出现两种p2 1WAF1DNA多态性 ,前者明显高于后者 ,组间有显著差异 (χ2 =3 94 ,P <0 0 5 ) ;5 0 % (5 0 / 10 0 )的乳腺癌组织和 12 5 % (5 / 4 0 )对照组组织表达p2 1WAF1蛋白 ,前者明显高于后者 ,组间有显著差异 (χ2 =16 84 ,P <0 0 1) ;10 0 % (18/ 18例 )的具有p2 1WAF1DNA多态性的乳腺癌组织p2 1WAF1蛋白表达阳性 ,39% (32 / 82 )的无p2 1WAF1DNA多态性乳腺癌组织蛋白表达阳性 ,p2 1WAF1DNA多态性组明显高于无多态性组 ,组间有显著差异 (χ2 =2 1 95 ,P <0 0 1) ;p2 1WAF1DNA多态性与p2 1WAF1蛋白表达呈正相关 (r =0 5 76 ,P <0 0 1)。结论 :乳腺癌组织p2 1WAF1DNA多态性可能产生不同的转录本并生成相应的蛋白质分子。     

Wnt-frizzled信号通路与心血管疾病关系的研究进展

Many researches have focused on the wnt- frizzled cascade in the recent years, while much work has been done in neoplastic diseases and embryology, the role of the wnt- frizzled signal transduction pathway in cardiovascular diseases has only recently begun to be explored. It plays a very important role in many physiological and pathophysiological processes, such as its transduction pathway, the healing after myocardial infarction, the proliferation, differentiation and orientation of cardiomyocytes, angiogenesis/neovascularization, cardiac hypertrophy and heart failure, the deposition of the extracellular matrix and so on. This article is aimed at its relation with myocardial infarction and the role of this pathway in cardiovascular diseases.