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《中国兽医学报》2017,(6):989-993
为了研究蜂胶黄酮对宿主细胞感染不同结构病毒后产生抗感染因子的影响,将蜂胶黄酮从最大安全质量浓度250mg/L倍比稀释5个浓度,与猪传染性胃肠炎病毒(transmissible gastroenteritis of pigs virus,TGEV)、细小病毒(porcine parvovirus,PPV)分别一起加至长成单层PK-15细胞培养体系中,ELISA法测定蜂胶黄酮对TGEV或PPV感染PK-15细胞后产生IFN-β、IFN-γ和iNOS抗感染因子的含量。结果显示,与病毒对照组比较,在感染TGEV后2,12h的前期,蜂胶黄酮可以显著提高PK-15细胞产生IFN-β、IFN-γ和iNOS含量的能力;在感染PPV后2,12h的前期,只有较高质量浓度的蜂胶黄酮可以提高PK-15细胞产生IFN-β、IFN-γ和iNOS含量的能力。PK-15细胞在感染病毒后24,48和72h,蜂胶黄酮对提高TGEV感染PK-15细胞后产生抗感染因子能力高于PPV。蜂胶黄酮提高有囊膜的TGEV感染宿主PK-15细胞产生抗感染因子能力高于无囊膜的PPV。 相似文献
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《中国兽医杂志》2016,(5)
采用体内外试验研究纳米蜂胶黄酮抗猪细小病毒活性。体外试验,以普通蜂胶黄酮为对照,分3种加药方式(先加蜂胶,后加蜂胶,蜂胶和病毒同时加入)加至PK-15细胞中,用MTT法检测细胞活性,实时荧光PCR检测PK-15细胞中猪细小病毒(PPV)含量,观察蜂胶黄酮对PK-15细胞抗PPV及清除PPV能力的影响。结果显示,与普通蜂胶黄酮相比,纳米蜂胶黄酮可显著抑制PPV在PK-15细胞上生长,高浓度效果优于低浓度,3种加药方式中先加药物的效果最好。体内试验,豚鼠注射PPV后灌胃纳米蜂胶黄酮和普通蜂胶黄酮,检测血液中PPV含量、血清中HI含量。结果显示,高、中剂量的纳米蜂胶黄酮可以显著抑制PPV在血液中复制、减轻PPV对豚鼠体重的影响、提高血清HI效价。结论,普通蜂胶黄酮经纳米化处理后,可以显著提高其抗PPV活性。 相似文献
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《中国兽医学报》2017,(1)
采用体内外试验研究纳米蜂胶黄酮抗猪细小病毒(PPV)作用。体外试验是以普通蜂胶黄酮为对照,分3种加药方式(先加蜂胶、后加蜂胶、蜂胶和病毒同时加入)加至PK-15细胞中,用MTT法检测细胞活性,实时荧光PCR检测PK-15中PPV含量,观察蜂胶黄酮对PK-15抗PPV及清除PPV能力的影响。体内试验是给豚鼠注射PPV后灌胃纳米蜂胶黄酮和普通蜂胶黄酮,检测肺脏、肾脏、肝脏、性腺及血液中PPV含量、血清中HI含量。结果显示:(1)与普通蜂胶黄酮相比,纳米蜂胶黄酮可显著抑制PPV在PK-15上生长,高浓度效果优于低浓度,3种加药方式中先加药物的效果最好;(2)高中剂量的纳米蜂胶黄酮可以显著抑制PPV在血液中复制、减轻PPV对豚鼠体重的影响、提高血清HI效价。结果表明:蜂胶黄酮经纳米化处理后,可以显著提高其抗PPV活性。 相似文献
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为研究蜂胶体外抗猪细小病毒（porcine parvovirus,PPV）活性,用细胞维持液将蜂胶稀释成10个浓度,加至长成单层的PK-15细胞培养体系中,用MTT法测定蜂胶对PK-15细胞的安全浓度;将蜂胶从最大安全浓度倍比稀释5个梯度,分3种加药方式（先加蜂胶后加PPV、先加PPV后加蜂胶、蜂胶和PPV同时加入）加至PK-15细胞培养体系中,用MTT法观察蜂胶对PPV感染PK-15细胞的影响;采用实时荧光定量PCR方法检测PK-15细胞培养体系中PPV含量,观察蜂胶对PK-15细胞清除PPV能力的影响。结果显示,在31.2~250 μg/mL安全浓度范围内蜂胶组D570 nm值和PPV含量分别显著高于和低于病毒对照组（P<0.05）,表明蜂胶可增强PK-15细胞抗PPV感染及清除PPV的能力。蜂胶的这种作用效果与其浓度和加药方式有关,蜂胶浓度越高则效果越好;3种加药方式中,以先加蜂胶后加PPV方式抵抗PPV感染活性最好。 相似文献
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本试验旨在研究蜂胶黄酮对宿主细胞抗病毒能力的影响。首先采用MTT法测定蜂胶黄酮对宿主鸡胚成纤维细胞（CEF）和PK-15细胞的安全浓度;然后将蜂胶黄酮从最大安全浓度250 μg/mL开始倍比稀释至15.6 μg/mL共5个浓度,将蜂胶黄酮分别与新城疫病毒（NDV）、鸡传染性法氏囊病病毒（IBDV）、猪传染性胃肠炎病毒（TGEV）及猪细小病毒（PPV）一起加到相应长成单层的宿主细胞CEF或PK-15中,在感染后24、48和72 h分别用MTT法测定宿主细胞的存活率,代表蜂胶黄酮提高宿主细胞抗病毒能力的指标。结果显示,蜂胶黄酮可显著提高宿主细胞抗病毒能力,这种活性与其剂量正相关,即剂量越大作用越好。蜂胶黄酮提高宿主细胞抗有囊膜病毒NDV和TGEV作用主要体现在病毒感染的前期,而提高宿主细胞抗无囊膜病毒IBDV和PPV作用主要体现在病毒感染的后期。提示蜂胶黄酮可用于NDV和TGEV的预防及IBDV和PPV的治疗。 相似文献
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《中国预防兽医学报》2019,(3)
为探究PK-15细胞感染猪传染性胃肠炎病毒(TGEV)后相关凋亡基因Bcl-XL、MCL-1及PUMA mRNA转录水平差异以及TGEV增殖与细胞凋亡之间的关联,本研究在TGEV感染PK-15细胞前后,应用流式细胞仪检测细胞凋亡率,结果显示TGEV具有诱导PK-15细胞发生凋亡的能力;并利用建立的q PCR方法对凋亡相关基因Bcl-XL、MCL-1和PUMA mRNA的转录水平进行测定,结果显示,感染TGEV (实验组)后Bcl-XL、MCL-1和PUMA mRNA转录水平与未感染病毒组(对照组)有明显差异,进一步表明TGEV感染PK-15细胞诱导了细胞凋亡的进程。本研究为了解TGEV诱导PK-15细胞凋亡的机制提供了实验依据。 相似文献
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为了解猪细小病毒(PPV)感染后引起干扰素及其相关细胞因子的反应,探讨宿主一病毒之间的作用关系,作者运用荧光定量PCR技术,测定和分析PPV感染PK-15细胞引起的病毒DNA量的变化和细胞因子IFN-β、IFN-γ、IFNAR-1、IFNAR 2、MHC-I、MHC一Ⅱ、MX1、iNOS、2-5AS、RNase L和IRF-3的转录水平.结果显示,PPV感染PK-15细胞12h病毒开始大量迅速增殖,48 h达到最高峰;PPV感染后可引起PK-15细胞中IFN-β、IFN-γ、IFNAR-1、IFNAR-2、MHC-I、MHC-Ⅱ、Mxl、iNOS、2-5AS、RNase I.和IRF-3的转录量显著增加,其中Mχ1基因在24 h转录量达到8 423倍.猪细小病毒感染可引起PK-15细胞抗病毒相关因子转录增加. 相似文献
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为分析猪圆环病毒2型(PCV2)与猪细小病毒(PPV)体外共感染对猪外周血单个核细胞(PBMC)细胞凋亡相关因子mRNA转录水平的影响,探讨PCV2和PPV共感染机制及宿主—病毒之间的作用关系,运用病毒滴度和相对荧光定量PCR技术,测定和分析PCV2和PPV感染PBMC后PCV2、PPV的病毒滴度含量及Bcl-2、FasL、p53、Caspase-8、PBR、TNF-α等的转录时相变化。结果表明:PCV2、PPV能够感染PBMC细胞,PCV2/PPV共感染中PCV2、PPV的含量分别在24h显著最高(P<0.001);PCV2、PPV单独感染和PCV2与PPV共感染PBMC后引起Bcl-2、FasL、p53、Caspase-8、PBR、TNF-αmRNA转录水平上升;在3h时PCV2/PPV共感染组PBR、P53mRNA转录水平显著高于PCV2、PPV单感染组(P<0.05),12h时PCV2/PPV共感染组FasLmRNA转录水平显著高于PCV2、PPV单感染组(P<0.05),24h时Bcl-2、Caspase-8mRNA转录水平显著高于PCV2、PPV单感染组(P<0.05),PCV2/PPV共感染组TNF-αmRNA转录水平显著高于PPV组(P<0.05),与PCV2组差异不显著。结论:PCV2与PPV共感染引起细胞凋亡相关因子mRNA转录水平上调,加速淋巴细胞凋亡,本试验为PCV2和PPV共感染机制研究提供了理论基础和试验依据。 相似文献
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制备莪术油注射液,评价莪术油注射液体外对猪细小病毒(PPV)7909标准毒株的作用效果。在PK-15细胞上,通过不同加药方式观察PK-15细胞病变(CPE),用MTT法测定细胞活力。结果在PK-15细胞上,药物最大安全浓度(TD0)为86.4μg/mL,半数感染浓度(TD50)为162.2μg/mL;在药物安全浓度范围内,莪术油注射液对PPV 7909标准毒株的半数抑制浓度(IC50)为1.865μg/mL,半数阻断浓度(IC50)为3.75μg/mL,半数直接杀灭作用浓度(IC50)为81.2μg/mL。结果表明莪术油对PPV 7909标准毒株有明显的体外抑制作用,但直接杀灭作用不明显。 相似文献
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为研究与猪传染性胃肠炎病毒(TGEV)结合的猪氨基肽酶N (pAPN)受体核心区对TGEV复制以及细胞功能的影响，本研究检索并分析p APN与TGEV的结合位点，结果显示，敲除p APN aa668～aa963对其酶活性无影响。因此，利用CRISPR/Cas9技术构建p APN与TGEV结合位点敲除细胞系，经PCR和western blot鉴定结果显示，正确构建一株敲除p APN aa668～aa963的ST细胞系，即敲除p APN 15-21外显子，命名为KO-ST-15。采用CCK-8和细胞划痕方法检测KO-ST-15细胞的增殖和细胞迁移活性，结果显示，敲除p APN 15-21外显子对ST细胞增殖和迁移活性均无显著影响。利用RT-q PCR和IFA检测KO-ST-15感染TGEV后病毒复制拷贝数和N蛋白的表达，结果显示，敲除p APN 15-21外显子可极显著抑制TGEV在ST细胞系中的复制(P<0.001)。利用RT-q PCR检测KO-ST-15感染TGEV后炎症相关基因转录水平变化，结果显示，TGEV感染后KO-ST-15中的IL-6、IL-8和NLRP3 (NOD-... 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献