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Peptides Derived of Kunitz-Type Serine Protease Inhibitor as Potential Vaccine Against Experimental Schistosomiasis
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Hernández-Goenaga, Juan
López-Abán, Julio
Protasio, Anna V.
Santiago, Belén Vicente
del Olmo, Esther
Vanegas, Magnolia
Fernández-Soto, Pedro
Patarroyo, Manuel A.
Muro, Antonio
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2019
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Frontiers Media S.A.
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Abstract
Schistosomiasis is a significant public health problem in sub-Saharan Africa, China, Southeast Asia, and regions of South and Central America affecting about 189 million people. Kunitz-type serine protease inhibitors have been identified as important players in the interaction of other flatworm parasites with their mammalian hosts. They are involved in host blood coagulation, fibrinolysis, inflammation, and ion channel blocking, all of them critical biological processes, which make them interesting targets to develop a vaccine. Here, we evaluate the protective efficacy of chemically synthesized T- and B-cell peptide epitopes derived from a kunitz protein from Schistosoma mansoni. Putative kunitz-type protease inhibitor proteins were identified in the S. mansoni genome, and their expression was analyzed by RNA-seq. Gene expression analyses showed that the kunitz protein Smp_147730 (Syn. Smp_311670) was dramatically and significantly up-regulated in schistosomula and adult worms when compared to the invading cercariae. T- and B-cell epitopes were predicted using bioinformatics tools, chemically synthesized, and formulated in the Adjuvant Adaptation (ADAD) vaccination system. BALB/c mice were vaccinated and challenged with S. mansoni cercariae. Kunitz peptides were highly protective in vaccinated BALB/c mice showing significant reductions in recovery of adult females (89–91%) and in the numbers of eggs trapped in the livers (77–81%) and guts (57–77%) of mice. Moreover, liver lesions were significantly reduced in vaccinated mice (64–65%) compared to infected control mice. The vaccination regime was well-tolerated with both peptides. We propose the use of these peptides, alone or in combination, as reliable candidates for vaccination against schistosomiasis. © Copyright © 2019 Hernández-Goenaga, López-Abán, Protasio, Vicente Santiago, del Olmo, Vanegas, Fernández-Soto, Patarroyo and Muro.
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Keywords
CD1 antigen , Epitope , Ion channel , Serine proteinase inhibitor , Vaccine , Adult , Animal experiment , Animal model , Animal tissue , Article , Bioinformatics , Biomphalaria glabrata , Cercaria , Controlled study , Drug efficacy , Echinococcus multilocularis , Enzyme linked immunosorbent assay , Fasciola hepatica , Female , Fibrinolysis , Gene expression , Inflammation , Molecular genetics , Mouse , Nonhuman , Peptide synthesis , Polymerase chain reaction , Reversed phase high performance liquid chromatography , Schistosoma granulosus , Schistosoma haematobium , Schistosoma japonicum , Schistosoma mansoni , Schistosomiasis , Schistosomulum , Stereomicroscopy , Upregulation , Vaccination , ADAD vaccination system , Helminth vaccines , Immunomodulator AA0029 , Kunitz-type proteins , Schistosoma mansoni , Synthetic peptide
