β-胡萝卜素对免疫抑制小鼠免疫指标的影响

为研究β-胡萝卜素对小鼠免疫功能的影响,在基础日粮中添50mg/kg的β-胡萝卜素,使用环磷酰胺建立免疫抑制模型。最后观察免疫器官组织形态学变化,测定免疫器官指数,血清中细胞因子以及免疫球蛋白含量等指标。结果表明β-胡萝卜素能改善由环磷酰胺引起免疫器官的损伤,通过提高免疫抑制小鼠血清中的细胞因子和免疫球蛋白含量,增强机体免疫力。     

干扰素治疗犬瘟热感染临床效果观察报告

<正>干扰素(LFN)是机体正常细胞(包括淋巴细胞)被病毒感染和其它刺激后分泌的一族细胞因子,属糖蛋白类,可通过受体介导,增强单核——巨噬细胞的功能和免疫调节作用。LFN具有调节抗体生成、增强特异性细胞毒作     

猪细胞因子IL-2、IL-4和IFN-γ作为免疫增强剂和新型基因工程疫苗的研究

通过综述猪IL-2、IL-4和IFN-γ的基因结构、作为免疫佐剂和作为构建新型基因工程疫苗方面研究进展,以了解细胞因子IL-2、IL-4和IFN-γ的相关研究成果,为细胞因子进行更深入的研究提供参考。     

Practical starter pig amino acid requirements in relation to immunity,gut health and growth performance

Immune system activation begins a host of physiological responses. Infectious agents are recognized by monocytes and macrophages which in turn stimulate cytokine production. It is the hormone-like factors called cytokines that orchestrate the immune response. The classic responses observed with immune system activation and cytokine production include： anorexia, fever, lethargy, recruitment of other immune cells, and phagocytosis. While production of immune system components is known to require some amino acids, increases in amino acid requirements are more than offset by the associated decrease in protein accretion and increased muscle protein degradation that also accompanies immune system activation. However, the biggest impact of cytokine production is a decrease in feed intake. Therefore, as feed intake decreases, the energy needed to drive protein synthesis is also decreased. This suggests that diets should still be formulated on a similar calorie：lysine ratio as those formulated for non-immune challenged pigs. The evidence is sparse or equivocal for increasing nutrient requirements during an immune challenge. Nutritionists and swine producers should resist the pressure to alter the diet, limit feed, or add expensive feed additives during an immune challenge. While immune stimulation does not necessitate changes in diet formulation, when pigs are challenged with non-pathogenic diarrhea there are potential advantages on gut health with the increased use of crystalline amino acids rather than intact protein sources （i.e., soybean meal）. This is because reducing crude protein decreases the quantity of fermentable protein entering the large intestine, which lowers post weaning diarrhea. It also lowers the requirement for expensive specialty protein sources or other protein sources such as soybean meal that present immunological challenges to the gut. The objective of this review is two-fold. The first is to discuss immunity by nutrition interactions, or lack thereof, and secondly, to review amino acid re     

奶山羊乳房炎及其疫苗免疫的免疫学变化

应用细胞培养技术，MTT测定法，放射免疫分析法，对正常组、乳房炎组、疫苗组、中荔组、联合组奶山羊血液、脾、乳上淋巴结T、B淋巴细胞的增殖功能以及淋巴细胞IL-1、IL-6、TNF-α诱生活性的动态变化进行检测。结果，疫苗和中药可增强奶山羊血液和免疫器官的T淋巴细胞免疫功能和B细胞体液免疫功能，对淋巴细胞TNF-α、IL-1、IL-6免疫调节机能有促进作用，奶山羊在患乳房炎后其上述被检指标均降低。     

H9N2亚型禽流感病毒感染TC-1细胞诱导的免疫反应

为了更好地了解宿主对禽流感病毒(AIV)感染后的免疫反应,本试验以TC-1细胞为模型,感染H9N2亚型AIV。通过荧光定量PCR(qRT-PCR)和酶联免疫吸附试验(ELISA)方法检测了3种模式识别受体(TLR-3、RIG-I和MDA-5)和5种炎性细胞因子(IL-6、RANTES、IP-10、TNF-α和IFN-β)。结果显示:3种模式识别受体中MDA-5上调最为明显,5种炎性因子中RANTES和IP-10上调最为明显;而IL-6、TNF-α和IFN-β上调相对较平缓。本研究结果表明:在病毒感染过程中MDA-5反应较TLR-3和RIG-I更为强烈,而在炎性反应过程中RANTES和IP-10反应更加剧烈,IL-6、TNF-α和IFN-β反应则相对较温和一些。本研究在一定程度上反映了机体对流感病毒的免疫反应机制,为在生产中疫苗的使用具有一定的指导意义。     

Research Progress on Cytokine Adjuvants

As an adjuvant, cytokine plays a key role in regulating the innate and adaptive immunity and enhancing the vaccine specific immune responses. The researches on the interleukin, interferon, granulocyte macrophage colony stimulating factors, tumor necrosis factors, and chemotactic factor have made considerable progress. Now we reviewed the cytokine adjuvant application in order to provide reference for the future application.     

PCV2对小鼠肠道SIgA及相关细胞因子含量的影响

用PCV2感染5周龄昆明系小鼠,分别在感染后7,14,21,28,35,42d处死小鼠,取脾脏、腹股沟淋巴结、Peyers结做PCR鉴定PCV2感染情况,提取肠道中蛋白检测SIgA及肠道相关细胞因子IL-2、IL-4、IL-10和IFN-γ含量的变化。结果显示:随着感染时间的延长,试验组小鼠肠道SIgA、IL-2和IFN-γ水平均呈先升高后降低的趋势,IL-4和IL-10呈持续升高的趋势。结果表明:小鼠肠道SIgA及相关细胞因子的含量在PCV2的刺激下发生了不同程度的改变。     

白细胞介素18的生物学功效及在动物疾病方面的应用

白细胞介素18（IL-18）是一种能诱导IFN-γ产生的新型细胞因子。它具有多种生物学功能．能诱导Th1细胞和自然杀伤细胞产生干扰素γ，促进T淋巴细胞和自然杀伤细胞表达FasL，有较强的抗肿瘤和抗微生物感染的作用。