Abstract:
:Fasciolosis continues to be a major cause of economic losses in the livestock industry and a growing threat to humans. The limited spectrum of effective anthelmintics and the appearance of resistances urge the need for developing an effective vaccine. Most studies have been focused on the use of TH1-polarizing adjuvants and the use of recombinant Fasciola critical molecules and, despite the efforts, no reproducible protections have been achieved. The F. hepatica MF6p/FhHDM-1 protein is a heme-binding protein also reported to have immunomodulatory properties, constituting a promising target for vaccination and/or as target for the development of new flukicides. Thus, in this study, we investigated the effects of the TH1-polarizing adjuvant Quil A® on sheep immune response to MF6p/FhHDM-1, and the vaccine potential of both native and synthetic forms of this protein against ovine fasciolosis. Subcutaneous injection of Quil A® alone, i.e., without co-injecting any antigen, expands the antibody repertoire to MF6p/FhHDM-1 triggered by a subsequent primoinfection with metacercariae. This effect was not observed with aluminum hydroxide, the most frequently adjuvant used in commercial vaccines. On the other hand, vaccination with synthetic MF6p/FhHDM-1 in Quil A® prompted a 2-4-week delay in the antibody response induced in sheep by a challenge experimental infection. Moreover, fluke populations stablished showed stunted growth and low antigen release probably due to reduced metabolic activity. These observations suggest that primary circulating antibodies induced by the immunization had harmful effects on fluke development. Such effects could not be demonstrated to be associated to TH1 immune response linked events (production of IgG2 isotype antibodies and IFN-γ).
journal_name
Vaccinejournal_title
Vaccineauthors
Orbegozo-Medina RA,Martínez-Sernández V,González-Warleta M,Castro-Hermida JA,Mezo M,Ubeira FMdoi
10.1016/j.vaccine.2018.02.115subject
Has Abstractpub_date
2018-04-05 00:00:00pages
1949-1957issue
15eissn
0264-410Xissn
1873-2518pii
S0264-410X(18)30325-6journal_volume
36pub_type
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