The invention relates to the field of immunology technology, in particular to a multi-epitope antigen and its preparation method and its application in the preparation of drugs for preventing and treating Chlamydia psittaci infection. The invention provides a multi-epitope antigen of the amino acid sequence shown in SEQ ID NO:1, a fusion polypeptide including the antigen, and the use of the fusion polypeptide. The antigen has low molecular weight, simple preparation, and its immunogenicity is similar to that of macromolecular proteins. Experiments show that the antigen can induce humoral and Th1 cell immune response, and produce significant specific antibodies, interferon-gamma and interleukin-2. Vaccination could significantly reduce the Chlamydia load and inflammatory invasion in lung tissue of infected mice, and significantly reduce the levels of inflammatory factors IFN_gamma and IL_6. In addition, CD4 + T cells obtained from vaccinated mice significantly reduced the Chlamydia load in lung tissues of infected mice after subsequent metastasis, suggesting that CD4 + T cells play an important role in cellular immune response.
【技术实现步骤摘要】
多表位抗原及其制备方法与在制备防治鹦鹉热衣原体感染的药物中的应用
本专利技术涉及免疫学
,尤其涉及多表位抗原及其制备方法与在制备防治鹦鹉热衣原体感染的药物中的应用。
技术介绍
鹦鹉热衣原体是一种人畜共患病原体,可导致禽类和鸟类的鹦鹉热、鸟疫,以及人类的非典型肺炎。鹦鹉热衣原体的特征包括临床疾病的爆发过程和非常广泛的宿主范围。人类可通过吸入感染鸟类的尿液、粪便或其他排泄物的污染气溶胶发生感染。在成功传播给人类后,主要表现为呼吸道感染、菌血症,而在感染早期主要引起社区获得性肺炎。如不及时治疗,则可能导致包括脑炎和心肌炎等更加严重的并发症。衣原体感染虽然可以通过抗生素治疗有效控制,但它很容易复发。因此,安全有效的疫苗被认为是预防鹦鹉热衣原体感染和减少衣原体疾病传播最有效的方法。理想的候选抗原应该包含多个B细胞和T细胞表位,当抗原呈递细胞与MHCI类、MHCII类分子结合呈现抗原时,可诱导产生免疫应答。以往的研究表明,鹦鹉热衣原体主要外膜蛋白(MOMP)是一种高度保守的蛋白,可诱导动物模型产生特异性的抗衣原体免疫应答。此外,鹦鹉热衣原体MOMP可能是存在较多T细胞和 ...
【技术保护点】
1.如SEQ ID NO:1所示氨基酸序列的多表位抗原。
【技术特征摘要】
1.如SEQIDNO:1所示氨基酸序列的多表位抗原。2.一种融合多肽,其包括如SEQIDNO:1所示氨基酸序列和KLH蛋白序列。3.根据权利要求2所述的融合多肽,其特征在于,KLH位于SEQIDNO:1所示氨基酸序列的C端。4.编码权利要求1所述抗原或权利要求2~3任一项所述融合多肽的DNA分子。5.权利要求2所述多表位抗原或权利要求2~3任一项所述融合多肽在制备治疗性抗体、疫苗和/或检测试剂盒中的应用。6.根据权利要求5所述的应用,其特征在于,所述治疗性抗体或疫苗的作用包括:介导Th1型细胞免疫应答、降低...
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