The immunomodulatory protein RH36 is relating to blood-feeding success and oviposition in hard ticks

文献类型： 外文期刊

第一作者： Wang, Fangfang

作者： Wang, Fangfang;Lu, Xiaojuan;Guo, Fengxun;Gong, Haiyan;Zhang, Houshuang;Zhou, Yongzhi;Cao, Jie;Zhou, Jinlin;Zhou, Jinlin

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关键词： Immunomodulatory molecules;RH36;RNAi;Oviposition

期刊名称：VETERINARY PARASITOLOGY （ 影响因子：2.738； 五年影响因子：2.951 ）

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收录情况： SCI

摘要： An immunomodulatory protein designated RH36 was identified in the tick Rhipicephalus haemaphysaloides. The cDNA sequence of RH36 has 844 bp and encodes a deduced protein with a predicted molecular weight of 24 kDa. Bioinformatics analysis indicated that RH36 presented a degree of similarity of 34.36% with the immunomodulatory protein p36 from the tick Dermacentor andersoni. The recombinant RH36 (rRH36) expressed in Sf9 insect cells suppressed the T-lymphocyte mitogen-driven in vitro proliferation of splenocytes and the expression of several cytokines such as IL-2, IL-12, and TNF-alpha. Furthermore, the proliferation of splenocytes isolated from rRH36-inoculated mice was significantly lower than that in control mice, suggesting that rRH36 could directly suppress immune responses in vivo. In addition, microarray analysis of splenocytes indicated that the expression of several immunomodulatory genes was downregulated by rRH36. The silencing of the RH36 gene by RNAi led to a 37.5% decrease in the tick attachment rate 24 h after placement into the rabbit ears, whereas vaccination with RH36 caused a 53.06% decrease in the tick engorgement rate. Unexpectedly, RNAi induced a significant decrease in the oviposition rate, ovary weight at day 12 after engorgement, and egg-hatching rate. The effects of RH36 on blood feeding and oviposition were further confirmed by vaccination tests using the recombinant protein. These results indicate that RH36 is a novel member of immunosuppressant proteins and affects tick blood feeding and oviposition.

分类号： S85

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