马链球菌兽疫亚种烯醇化酶对小鼠肺泡巨噬细胞吞噬功能的影响   总被引：1，自引：1，他引：0  

陈楷文  华承薇  袁宸  潘飞  蔺辉星  范红结  马喆 《畜牧兽医学报》2020,51(10):2576-2583

旨在研究马链球菌兽疫亚种（Streptococcus equi ssp.zooepidemicus，SEZ）烯醇化酶（enolase，Eno）对小鼠肺泡巨噬细胞（RAW264.7）吞噬能力的影响。通过构建原核表达质粒获得重组烯醇化酶（rEno），采用台盼蓝活细胞计数法，判定在不同处理浓度和时间下rEno蛋白对RAW264.7细胞的细胞毒性。将rEno蛋白与RAW264.7细胞共孵育后，用SEZ作用于细胞并检测细胞吞菌数量，判断RAW264.7细胞对SEZ的吞噬活性。进一步通过活细胞稳定同位素标记技术（SILAC）和蛋白质谱分析技术（LC-MS/MS），筛选到RAW264.7细胞中可能与SEZ Eno存在相互作用的候选蛋白。结果发现，10 μg·mL^-1 rEno蛋白处理对RAW264.7细胞有明显的细胞毒性，且10 μg·mL^-1 rEno蛋白处理RAW264.7细胞2和4 h可显著抑制其对SEZ的吞噬作用（P<0.01、P<0.05）。初步筛选到RAW264.7细胞中动力蛋白激活蛋白亚单位蛋白（dynactin subunit protein 2，Dctn）、整合素α-M蛋白（integrin alpha-M）等17种可能与Eno发生互作的蛋白。本研究获得了rEno重组表达蛋白，发现rEno可减少RAW264.7细胞对SEZ的吞噬，互作蛋白的初步筛选也为进一步揭示Eno在SEZ抗吞噬中的作用机制奠定了基础。  相似文献   

Outbreak of anaplasmosis associated with novel genetic variants of Anaplasma marginale in a dairy cattle     

《Comparative immunology, microbiology and infectious diseases》2017

During early lactation, dairy cows may present a transient immunosuppressive state and develop anaplasmosis caused by Anaplasma marginale. In this study, clinical anaplasmosis in dairy cattle in the Thrace region of Turkey was investigated with respect to within-herd prevalence, vertical transmission, and genetic diversity. In March and September 2015, thirty lactating cows showed primary clinical signs of anaplasmosis, including fever, anaemia, decreased milk yield, anorexia, and laboured breathing. Symptoms disappeared in most cows after administration of long-acting oxytetracycline, but nine of them (30%) died. Following diagnosis based on clinical signs, microscopy and molecular findings, blood samples were collected from apparently healthy lactating cows (n = 184), pregnant heifers (n = 39) and newborn calves (n = 24). DNA was extracted from each sample and analyzed for the presence of major surface proteins (MSPs) of A. marginale, followed by sequencing to assess diversity of isolates. Microscopic examination of erythrocytes revealed A. marginale inclusion bodies in symptomatic cows. Examination of thin blood smears showed 3.8% of the lactating, clinically asymptomatic, cows to be infected with A. marginale, while nPCR detected 31.0% positive. A. marginale infection was not detected in pregnant heifers by either method. Congenital infection was found in one calf by nPCR. This is the first report of transplacental transmission of A. marginale in Turkey. The MSP4 sequence analyses showed high genetic diversity among the isolates, presenting 97.6-99.6% homology at the amino acid level. The sequences of MSP1a amplicons revealed genetic diversity providing three new tandem repeats.  相似文献   

Transgenic expression of a sorghum gene (SbLRR2) encoding a simple extracellular leucine-rich protein enhances resistance against necrotrophic pathogens in Arabidopsis     

《Physiological and Molecular Plant Pathology》2015

Plant leucine-rich repeat (LRR) domain-containing proteins are known to play important roles in signaling transduction and defense responses. In sorghum, SbLRR2 is pathogen-inducible gene encoding a simple extracellular LRR protein. Here, we demonstrated an earlier and stronger expression of SbLRR2 in a sorghum resistant genotype in comparison to a susceptible genotype following inoculation with the anthracnose pathogen (Colletotrichum sublineolum). In addition, SbLRR2 expression was found to be induced strongly by methyl-jasmonate treatment. Functional analysis was performed in SbLRR2 over-expression (OE) Arabidopsis plants, which showed enhanced resistance against the necrotrophic pathogens Botrytis cinerea and Alternaria brassicicola. In addition, the OE lines were found to have elevated expression of several jasmonate acid (JA)-associated genes and higher endogenous JA contents. Hence, the SbLRR2-mediated defense responses in transgenic Arabidopsis are likely to be dependent on JA-signaling through increased JA production. On the other hand, the OE lines remained susceptible to Pseudomonas syringae pv. tomato like the wild type plants. Consistently, there was no up-regulation of salicylic acid (SA) defense marker gene expression or SA levels in the OE lines. Our results suggested that SbLRR2 is potentially useful for enhancing resistance against necrotrophic pathogens in transgenic dicot crops.  相似文献   

H3N2亚型猪流感病毒HA和HA1蛋白的原核表达     

纪方晓  陈济铛  石庆伟  王衡  张桂红 《动物医学进展》2016,(6):22-25

为原核表达H3N2亚型猪流感病毒(SIV)的HA和HA1蛋白,通过RT-PCR方法获得SIV的HA和HA1基因,克隆至原核表达载体pMAL-c5X,并转化至原核表达菌Rosetta(DE3)中,表达菌经IPTG诱导表达后进行SDS-PAGE和Western blot分析。结果显示,成功表达了H3亚型SIV的HA和HA1蛋白,目的蛋白均以可溶性蛋白和包涵体两种形式存在,并与H3N2亚型SIV的HA单克隆抗体反应,说明HA和HA1蛋白具有良好的反应原性。  相似文献   

Effects of germination and kilning on the phenolic compounds and nutritional properties of quinoa (Chenopodium quinoa) and kiwicha (Amaranthus caudatus)     

《Journal of Cereal Science》2020

Quinoa (Chenopodium quinoa) and kiwicha (Amaranthus caudatus) are nutritious pseudocereals that originate from the Andean region. The aim of this research was to study the effect of germination and the subsequent kilning on the phenolic compounds and proximate composition in selected Peruvian varieties of quinoa (“Chullpi”) and kiwicha (“Oscar Blanco”). The germination process was carried out for 24, 48 and 72 h at 22 °C, and the kilning was performed with samples germinated for 72 h by drying the seeds at 90 °C for 5 min. Both processes increased the protein content of the samples. However, lipid content was reduced during germination. On the other hand, germination and kilning clearly increased the concentration of total phenolic compounds in both quinoa and kiwicha. Germination for 72 h either with or without kilning process resulted in a significant (p < 0.05) increase in the total content of phenolics compared to untreated materials, which was especially due to coumaric acid and a kaempferol tri-glycoside in quinoa and caffeoylquinic acid in kiwicha. Based on the results, germination and kilning may improve the nutritional quality of the Andean grains, encouraging the usage of the processed grains as ingredients in functional products for people with special gluten-free or vegetarian diets.  相似文献   

不同饲粮粗蛋白质水平下黑水虻蛋白替代豆粕对蛋鸡生产性能、蛋清品质及血清蛋白质代谢指标的影响     

车彦卓  黄振吾  武书庚  王晓翠  齐晓龙  王晶  张海军  齐广海 《动物营养学报》2020,(4):1632-1640

本试验旨在探讨不同饲粮粗蛋白质水平下黑水虻蛋白替代豆粕对蛋鸡生产性能、蛋清品质及血清蛋白质代谢指标的影响。采用单因素随机试验设计,选用252只产蛋率相近的33周龄罗曼白蛋鸡,随机分为3组,每组7个重复,每重复12只鸡。各组分别饲喂标准回肠可消化氨基酸(SIDAA)平衡模式下配制的不同粗蛋白质水平(16.50%、14.85%、13.20%)的玉米-豆粕-黑水虻蛋白饲粮,各组黑水虻蛋白与豆粕提供等量的粗蛋白质。预试期2周,正试期12周。结果表明:1)与16.50%组相比,14.85组%和13.20%组的产蛋率和平均日采食量无显著影响(P>0.05),平均蛋重显著降低(P<0.05),料蛋比显著升高(P<0.05);13.20%组的产蛋量显著降低(P<0.05),14.85%组的产蛋量无显著差异(P>0.05)。2)与16.50%组相比,14.85%组的平均蛋重、蛋清重、浓蛋白重、蛋白高度、哈氏单位和蛋清比例均无显著差异(P>0.05);13.20%组的平均蛋重、浓蛋白重、蛋白高度显著降低(P<0.05),蛋清重和哈氏单位呈下降趋势(P=0.0513和P=0.0673)。3)各组血清谷草转氨酶、谷丙转氨酶活性及总蛋白、白蛋白、尿酸含量无显著差异(P>0.05)。16.50%和13.20%饲粮粗蛋白质水平对蛋鸡输卵管膨大部分泌功能有轻微不良影响。由此可见,在SIDAA模式下,以黑水虻蛋白替代豆粕并使饲粮粗蛋白质水平降低至14.85%时对鸡蛋蛋清品质无不良影响。  相似文献   

Expression and mechanisms of hsa_circ_087631 in patients with primary biliary cholangitis     

ZHANG Yin-mei  Hao Xin-jie  ZHENG Jia-jia 《园艺学报》2021,36(12):2205-2211

AIM To explore the expression and mechanisms of circular RNA hsa_circ_087631 in the patients with primary biliary cholangitis （PBC）. METHODS RT-qPCR was used to detect the expression of hsa_circ_087631 in PBC patients and healthy controls. Hsa-miR-346-overexpressing lentiviral vector pLenti-EF1a-EGFP-F2A-Puro-CMV-MCS was constructed and transfected into human acute T cell leukemia Jurkat cells， and then the expression levels of hsa_circ_087631， Bcl-6 mRNA and interleukin-21 （IL-21） mRNA were detected by RT-qPCR. Dual-luciferase reporter assay was performed to identify the interactions between hsa_circ_087631 and hsa-miR-346. RESULTS The expression of hsa_circ_087631 in the PBC patients was significantly increased compared with the healthy subjects. Hsa-miR-346-overexpressing lentiviral vector pLenti-EF1a-EGFP-F2A-Puro-CMV-MCS was successfully constructed. The expression of hsa-miR-346 was significantly increased after the hsa-miR-346-overexpressing lentiviral vector was transfected into the Jurkat cells， while the expression levels of hsa_circ_0087631， Bcl-6 mRNA and IL-21 mRNA were significantly decreased. After wild-type or mutant hsa_circ_087631 vector and hsa-miR-346 mimics were transfected into 293T cells， the results of dual-luciferase reporter assay showed that hsa-miR-346 significantly decreased the luciferase activity of wild-type hsa_circ_087631 （P<0.01）， but the regulation did not change significantly after mutation of the predicted binding site. CONCLUSION Peripheral blood hsa_circ_087631 level is elevated in the PBC patients. The hsa_circ_087631/hsa-miR-346/Bcl-6 signaling may take effect in human T cells. Hsa-miR-346 significantly reduces the expression of hsa_circ_087631， but it may not be regulated by predicted binding sites.  相似文献   

膜联蛋白B1在猪囊尾蚴免疫逃避作用的研究进展     

于铭川  王昕蕊  宋伟宜  宋伊宁  杨景芳  孙树民 《中国农学通报》2021,37(8):110-115

膜联蛋白是一类有效的内源性调节蛋白,在Ca²⁺存在的条件下与膜磷脂结合,参与细胞活动的多种功能,其与肿瘤发生、自身免疫性疾病、病毒和寄生虫感染等密切相关。作为膜联蛋白家族成员Annexin B1具有独特的氨基酸残基结构,与不同种属的寄生虫入侵特异性宿主密切相关。本文主要阐述了膜联蛋白的种类及膜联蛋白B1在猪囊尾蚴感染宿主机体过程中免疫逃避的作用,旨在探索其猪囊尾蚴感染的免疫逃避机制。深入对膜联蛋白B1和囊尾蚴之间相互关系的进一步了解,以及膜联蛋白B1在寄生虫免疫中更深入的研究,对寄生虫免疫逃避的生物学意义和寄生虫病诊断治疗提供了相关的策略。  相似文献   

桑天牛卵啮小蜂对桑天牛卵寄生作用的初探   总被引：1，自引：0，他引：1  

袁芳芳  苏筱雨  黄大庄  田静  杨翠荣 《河北林果研究》2016,(1):54-57

为了研究桑天牛卵啮小蜂对桑天牛卵的寄生作用,采用SDS聚丙烯酰胺凝胶电泳的方法,在室内测定桑天牛卵啮小蜂寄生后桑天牛卵内蛋白质的变化情况,结果表明:桑天牛卵内的蛋白质图谱变化顺序被桑天牛卵啮小蜂的寄生改变了,尤其是前3d的蛋白质条带变化比较显著,寄生1d的桑天牛卵内比未被寄生的卵内多出3条谱带,分别为200kD、170kD和150kD,到寄生2d时又一起消失了;与此同时又新出现1条小于43kD的蛋白质带,该带到第10天时仍然存在;这表明前3d是寄生作用的关键时期,出现一些特异性蛋白质的可能性比较大。  相似文献   

Effects of Dietary Energy and Protein Levels on Free Force-Feed Peking Ducks     

《The Journal of Applied Poultry Research》2019,28(3):606-615

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