The role of paramyosin from blood fluke Schistosoma mansoni in inhibition of the complement system

Grekin, Lina; Cohen, Ram; Sodetz, James M.; Gold, Daniel; Fishelson, Zvi

doi:10.1016/j.molimm.2008.08.230

Cited by 1 publication

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“…Pmy is a promising candidate vaccine antigen that has been confirmed in a variety of parasites [20][21][22][23][24]. To compare the efficacy of different types of Pmy vaccines, we prepared the peptide vaccine (KLH-LEE) and the Pmy recombinant protein (rPmy) of H. longicornis in this study.…”

Section: Resultsmentioning

confidence: 99%

Evaluation on two types of paramyosin vaccines for the control of Haemaphysalis longicornis infestations in rabbits

Cui

Cao

et al. 2021

Parasites Vectors

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Background Haemaphysalislongicornis is an obligate hematophagous ectoparasite that transmits a variety of pathogens causing life-threatening diseases in humans and animals. Paramyosin (Pmy) is not only an invertebrate-specific myofibrillar protein but also an important immunomodulatory protein. Therefore, it is one of the ideal candidate antigens for vaccines. Methods We conducted two vaccine trials to evaluate the protective efficacy of Pmy recombinant protein (rPmy) and peptide vaccine (KLH-LEE). Each rabbit was immunized with three doses of rPmy or KLH-LEE adjuvanted with Freund’s complete/incomplete at 500 μg/dose at 2-week intervals before challenge with 40 female H.longicornis/rabbit. PBS plus adjuvant, Trx or KLH was used as control group. The antibodies of rabbits were detected by ELISA. Then, female ticks were fed on the rabbits until detachment. Results ELISA results showed that both vaccines induced rabbits to produce antibodies. Compared with the Trx group, the engorgement weight, oviposition and hatchability of the rPmy group decreased by 8.87%, 26.83% and 38.86%, respectively. On the other hand, engorgement weight, oviposition and hatchability of female ticks in the KLH-LEE group correspondingly resulted in 27.03%, 53.15% and 38.40% reduction compared with that of the KLH group. Considering the cumulative effect of vaccination on the evaluated parameters, results showed 60.37% efficacy of the rPmy vaccine formulation and 70.86% efficacy in the KLH-LEE group. Conclusions Pmy and particularly epitope LEE have potential for further development of an effective candidate vaccine to protect the host against tick infection. Graphic abstarct

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