Characterization of antigenic proteins of the Taenia solium postoncospheral form

IF 1.4 4区 医学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY
Nancy Chile , Edson G. Bernal-Teran , Beth J. Condori , Taryn Clark , Hector H. Garcia , Robert H. Gilman , Manuela R. Verastegui , for The Cysticercosis Working Group in Peru
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Abstract

Neurocysticercosis is the leading cause for acquired epilepsy worldwide, and it is caused by the larval stage of the parasite Taenia solium. Several proteins of this stage have been characterized and studied to understand the parasite-host interaction, however, the proteins from the early cysticercus stages (the postoncospheral form) have not yet been characterized. The study of the postoncospheral form proteins is important to understand the host-parasite relationship in the early stages of infection. The aim of this work was to identify postoncospheral form antigenic proteins using sera from neurocysticercosis patients. T. solium activated oncospheres were cultured in HCT-8 cells to obtain the postoncospheral form. Soluble total and excretory/secretory proteins were obtained from the postoncospheral form and were incubated with both pool sera and individual serum of neurocysticercosis positive human patients. Immunoblotting showed target antigenic proteins with apparent molecular weights of 23 kDa and 46–48 kDa. The 46–48 kDa antigen bands present in soluble total and excretory/secretory postoncospheral form proteins were analyzed by LC-MS/MS; proteins identified were: nuclear elongation factor 1 alpha, enolase, unnamed protein product/antigen diagnostic GP50, calcium binding protein calreticulin precursor and annexin. The postoncospheral form expresses proteins related to interaction with the host, some of these proteins are predicted to be exosomal proteins. In conclusion, postoncospheral proteins are consistent targets of the humoral immune response in human and may serve as targets for diagnosis and vaccines.

疟原虫球后型抗原蛋白的特征。
神经囊尾蚴病是全球后天性癫痫的主要病因,它是由疟原虫Taenia solium的幼虫阶段引起的。为了了解寄生虫与宿主之间的相互作用,已经对这一阶段的几种蛋白质进行了表征和研究,但尚未对早期囊尾蚴阶段(后球形)的蛋白质进行表征。研究子囊后形态蛋白质对于了解感染早期宿主与寄生虫的关系非常重要。这项工作的目的是利用神经囊虫病患者的血清鉴定球后抗原蛋白。在 HCT-8 细胞中培养茨菰活化肿瘤球,以获得后肿瘤球形态。从球后形态中获得可溶性总蛋白和排泄/分泌蛋白,并与神经囊虫病阳性人类患者的集合血清和个体血清进行孵育。免疫印迹显示,目标抗原蛋白的表观分子量分别为 23kDa 和 46-48kDa。通过 LC-MS/MS 分析了存在于可溶性总蛋白和排泄/分泌后球蛋白中的 46-48kDa 抗原条带;确定的蛋白有:核延伸因子 1 alpha、烯醇化酶、未命名蛋白产物/抗原诊断 GP50、钙结合蛋白 calreticulin 前体和附件蛋白。球后形态表达与宿主相互作用有关的蛋白质,其中一些蛋白质预计是外泌体蛋白质。总之,球后蛋白是人类体液免疫反应的一致目标,可作为诊断和疫苗的目标。
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来源期刊
CiteScore
2.90
自引率
0.00%
发文量
51
审稿时长
63 days
期刊介绍: The journal provides a medium for rapid publication of investigations of the molecular biology and biochemistry of parasitic protozoa and helminths and their interactions with both the definitive and intermediate host. The main subject areas covered are: • the structure, biosynthesis, degradation, properties and function of DNA, RNA, proteins, lipids, carbohydrates and small molecular-weight substances • intermediary metabolism and bioenergetics • drug target characterization and the mode of action of antiparasitic drugs • molecular and biochemical aspects of membrane structure and function • host-parasite relationships that focus on the parasite, particularly as related to specific parasite molecules. • analysis of genes and genome structure, function and expression • analysis of variation in parasite populations relevant to genetic exchange, pathogenesis, drug and vaccine target characterization, and drug resistance. • parasite protein trafficking, organelle biogenesis, and cellular structure especially with reference to the roles of specific molecules • parasite programmed cell death, development, and cell division at the molecular level.
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