不同厂家胰酶制备鸡胚成纤维细胞对比试验

本试验用半胚法制备鸡胚成纤维细胞,用胰酶对SPF鸡胚进行消化培养,并观察所得细胞的生长情况。在相同条件下设立两个对照组,观察胰酶在细胞制备过程中对试验的影响,并比较不同厂家(Gibco和Difco)生产的胰酶在相同条件下对鸡胚消化情况及所得细胞生长情况的影响。     

Regulation of ectopic trypsin and proinflammatory cytokine expression by NF-κB and AP-1 in influenza A virus induced myocarditis

AIM: To investigate the regulatory effects of nuclear factor-κB (NF-κB) and activator protein-1 (AP-1) on the expression of ectopic trypsin and proinflammatory cytokines in influenza A virus (IAV)-induced myocarditis. METHODS: Male BALB/c mice of 8 weeks old (n=40) were randomly divided into 4 groups: normal control group (NC), infection control group (IC), NF-κB inhibitor group (NI) and AP-1 inhibitor group (AI). The mice in NC group and IC group were instilled intranasally with 15 μL saline and 40 plaque forming units (PFU) IAV, respectively. The mice in NI group and AI group were infected intranasally with 40 PFU IAV and injected intraperitoneally with 10 mg/kg NF-κB inhibitor pyrrolidine dithiocarbamate (PDTC) or 2.5 mg/kg AP-1 inhibitor nordihydroguaiaretic acid (NDGA) once daily. The mice were euthanized at day 9 after instillation, and the hearts were removed for pathological and biochemical analysis. RESULTS: IAV infection induced significant up-regulation of ectopic trypsin, and proinflammatory cytokines interleukin 6 (IL-6), IL-1β and tumor necrosis factor-α (TNF-α) in the myocardium, and triggered acute myocarditis. PDTC significantly inhibited NF-κB activation and up-regulation of ectopic trypsin and proinflammatory cytokines, and effectively suppressed IAV replication and myocardial inflammatory response (P<0.01). NDGA effectively inhibited AP-1 activity (P<0.01) and mildly suppressed up-regulation of proinflammatory cytokines (P<0.05), but had no effects on the expression of ectopic trypsin, IAV replication and the extent of myocarditis (P>0.05). CONCLUSION: IAV infection induces up-regulation of ectopic trypsin and proinflammatory cytokines in myocardium predominantly by the activation of NF-κB. AP-1 signaling pathway might be only partially involved in the regulation of proinflammatory cytokines.     

蓖麻蚕不同组织器官中胰蛋白酶抑制剂的种类与分析

胰蛋白酶抑制剂(TI)是鳞翅目昆虫体内广泛存在的一种蛋白酶抑制剂,主要功能是抑制胰蛋白酶的降解。采用非变性聚丙烯酰胺凝胶电泳和胰蛋白酶抑制剂活性染色,对18个蓖麻蚕品种5龄第5天的血液及其它组织中TI种类的分布进行了调查。经碱性聚丙烯酰胺凝胶电泳,在血液中共检测到8种TIs,分别命名为ETI-1~ETI-8,品种间存在多态性分布;在头和脂肪体中分别检测到1种TI;在体壁中检测到3种TIs。经酸性聚丙烯酰胺凝胶电泳,在血液中共检测到4种TIs,分别命名为ETI-b1、ETI-b2、ETI-b3和ETI-b4,品种间种类分布无差异;在血液中检测到的TI包含了在头、脂肪体和体壁中检测到的TI种类。     

中国大豆（G．max）种子蛋白SBTi—A_2电泳谱带新类型的遗传研究──ⅠTi~b型×Ti~x型（新类型）F_2种子的遗传规律

本文是对作者在１９９１年用ＰＡＯＥ技术检测甘肃省大豆（Ｇ．ｍａｘ）时发现的ＳＢＴｉ—Ａ２电泳谱带新类型的遗传研究结果之一。对单株上收获的２１２粒Ｆ２种子的电泳检测结果进行了卡方测验，符合孟德尔１：２：１基因分离规律。     

大豆胰蛋白酶抑制因子对力克斯青年兔血液生化指标及器官重的影响

选择健康、平均体重为1 544.2±114.8g的美系力克斯青年兔50只(公母比例为1:1),按性别、体重随机分为5组,每组10只,单笼饲养.5个组日粮中分别添加25%的生大豆、25%化学钝化大豆、25%热处理大豆、25%豆粕和13%生大豆 12%豆粕,试验期为6周.试验结束时,从每组随机选出3只公兔进行屠宰,宰前称其活重,心脏采血,用于测定血清生化指标;测定有关内脏器官重量,计算器官重与体重之比.结果表明:生大豆及不同加工处理大豆饲喂力克斯青年兔,血液生化指标在5个组间无显著差异(P＞0.05);胰腺重、肝脏重、肾重、脾重及其与体重之比,各组间差异不显著(P＞0.05).     

大豆(G.max)种子蛋白SBTi位点新类型的发现及甘肃省大豆SBTi位点各等位基因频率的研究

1991年,用PAGE技术检测了甘肃省243份大豆(G.max)品种种子蛋白中SBTi位点的等位基因型。检测结果:Ti~a型品种22份,占品种总数的90.9％,Ti~b21份,占8.6％,未发现Ti~c及ti型。发现一份材料的电泳图谱在与标样上Ti~a、Ti~b、Ti~c对应位置上没有谱带,而在Ti~b位置紧上方,有一条新谱带(Rf=0.79,Ti~b=0.82)。经加胰蛋白酶等措施多次验证,初步认为这很可能是在Ti位点上的一个新的等位基因控制下形成的蛋白谱带。     

Effect of heat treatments on trypsin/chyomotrypsin inhibitor activity of red gram (Cajanus cajan L.)

The application of dry heat to the seeds and meal was not effective in inactivating the trypsin inhibitory activity (TIA) and chymotrypsin inhibitory activity (CIA). Soaking for 24 hours followed by cooking for 20 min was effective in destroying the TIA and CIA.     

Effect of additives on flavonoids, d-chiro-Inositol and trypsin inhibitor during the germination of tartary buckwheat seeds

In this study, we evaluated tartary buckwheat during germination to provide an effective process that can lead to a rapid accumulation of both the total flavonoids and d-chiro-Inositol (DCI), as well as the elimination of trypsin inhibitor activity. At different concentrations of Al³⁺, Cu²⁺, and Zn²⁺, we found significant differences of the total flavonoids and DCI accumulation, and we observed changes in phenylalanine ammonia-lyase (PAL), chalcone isomerase (CHI), and α-Galactosidase (α-Gal) activities in germinated tartary buckwheat (p < 0.05). Correlation analysis between these enzymes (PAL, CHI and α-Gal) activities and the total flavonoids and DCI contents revealed a significant correlation in germinated tartary buckwheat. The maximum accumulation of the total flavonoids and DCI were 1315.52 mg/100 g DW and 60.46 mg/g DW with the addition of Al³⁺, 1315.41 and 63.59 with the addition of Cu²⁺, and 1189.42 and 53.10 with the addition of Zn²⁺. In these metal-treated samples, both total flavonoids and DCI were significantly higher than in the control (p < 0.05). Moreover, the metallic additives at the optimum concentration had no influence on total protein content, whereas a lower trypsin inhibitor activity was observed in correlation with higher protein digestibility.     

中药对脾虚仔猪胃蛋白酶和胰蛋白酶的影响

[目的]确定自拟的固肠促长散对脾虚仔猪胃蛋白酶和胰蛋白酶的影响。[方法]采用给仔猪注射利血平和交替不喂与喂饱的方法构建脾虚仔猪模型,分别在注射利血平前、最后一次注射利血平当天、灌药结束后次日及第8天测定仔猪的胃蛋白酶活力和胰蛋白酶含量。[结果]试验结束后,固肠促长散组的各种酶活性与正常对照组差异不显著,脾虚对照组和思密达组的各种酶活性与正常对照组差异显著。[结论]固肠促长散能促进利血平所致脾虚仔猪的胃蛋白酶活力和胰蛋白酶恢复。