Expression profiling and immunofluorescence localization of the major egg antigen p40 of Schistosoma japonicum in the liver of infected New Zealand white rabbits
- VernacularTitle:日本血吸虫主要虫卵抗原Sjp40在感染新西兰白兔肝脏中的表达与免疫定位
- Author:
Dan XIA
1
;
Ganming DENG
;
Pingying TENG
;
Yu XIE
;
Yaomin LI
;
Chunmei WANG
;
Shujie CHEN
;
Minfang CHEN
;
Rongjia MAI
;
Haiyan LIAO
;
Lingyu SHI
;
Liyan OU
;
Qiwei CHEN
;
Xiaoguang CHEN
;
Xiaohong ZHOU
Author Information
1. 南方医科大学公共卫生与热带医学学院病原生物学系
- Keywords:
Schistosoma japonicum;
schistosomiasis;
Sjp40;
egg granuloma;
immunofluorescence localization
- From:
Journal of Southern Medical University
2015;(6):826-831
- CountryChina
- Language:Chinese
-
Abstract:
Objective To examine the expression profile and immunofluorescence localization of the major egg antigen p40 of Schistosoma japonicum (Sjp40) during granuloma formation in the liver of infected New Zealand white rabbits. Methods New Zealand white rabbits were infected with S. japonicum cercariae, and the livers were harvested at 29 and 45 days post-infection (dpi). The total RNA of the liver tissues was extracted for expression profiling of Sjp40 by quantitative reverse transcription-PCR (qRT-PCR) with GAPDH of S. japonicum as the endogenous reference gene. The expression of Sjp40 in the liver were detected by Western blotting using anti-Sjp40 monoclonal antibody (mAb) 9G7 or anti-Toxoplasma gondii tSAG1 mAb Y3A8 (control) as the primary antibody. Paraffin sections of the liver were prepared for observing egg granuloma formation using HE staining and for indirect immunofluorescence assay of Sjp40 location in the trapped eggs and egg granulomas. Results The level of Sjp40 mRNA in the eggs trapped in rabbit livers was significantly higher at 45 dpi than that at 29 dpi (P<0.05), and Western blotting confirmed the presence of Sjp40 protein in the rabbit livers at both 29 and 45 dpi. Immunofluorescence assay demonstrated localized expression of Sjp40 in the immature eggs in the rabbit liver at 29 dpi, but at 45 dpi fluorescence was detected in clusters of mature eggs containing miracidium and in the surrounding egg granulomas. Conclusion The transcriptional levels of Sjp40 significantly increased with the maturation of eggs trapped in the rabbit livers. Sjp40 protein spread from the eggs to the surrounding egg granuloma at 45 dpi when acute liver granulomatous lesions occur, suggesting that Sjp40 plays a key role in egg granulomas formation in the livers of infected New Zealand white rabbits.
