Linked Life Data

17918360

Source:http://linkedlifedata.com/resource/pubmed/id/17918360

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2007-10-8
pubmed:abstractText
Vaccination with fatty acid-binding proteins (FABPs) from Fasciola hepatica has been shown to confer significant levels of protection against challenge infection in mice, rabbits, and sheep. A recombinant 15-kDa FABP (rFh15) has been purified and also shown to be an immunoprotective molecule. From the rFh15 molecule sequence 2, 12- and 10-mer putative T-cell epitopes were identified, the first an Fh15Ta of amino acid sequence IKMVSSLKTKIT, and the second an Fh15Tb of amino acid sequence VKAVTTLLKA. The synthesized oligonucleotides were cloned individually into a pGEX-2TK expression vector. The overexpressed fusion protein was affinity purified using glutathione S-transferase (GST) by competitive elution with excess reduced glutathione. These GST fusion proteins were emulsified in Freund adjuvant for rabbit immunizations or further purified as peptides after digestion with thrombin. The purified 12- and 10-mer peptides were either emulsified in Freund adjuvant for immunizations in rabbits or used in an adjuvant-adaptation (ADAD) system, followed by challenge infection with F. hepatica metacercariae in mice and rabbits. In vaccinated-challenged rabbits, the highest levels of protection were found in those treated with GST-epitopes (Fh15Ta 48.2% and Fh15Tb 59.1% reduction, respectively), as compared to GST-immunized controls. Moreover, those immunized with Fh15Ta had higher (84%) numbers of immature flukes as compared with Fh15Tb (41%) or GST alone (64%). The rabbits immunized with the putative T-cell epitopes in adjuvant had a 13% reduction in flukes in those with Fh15Ta and also were highest with immature flukes (46%). In vaccinated mice challenged with a lethal number of metacercariae, both CD-1 and BALB/c mice treated with complete ADAD-GST-Ta had the highest (40%) survival rates of all groups by 47 days postinfection. Thus the Fh15Ta and Fh15Tb polypeptide epitopes warrant further study as a potential vaccine against F. hepatica. Antibody isotype studies in mice revealed a mixed Thl/Th2 response to vaccination.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0022-3395
pubmed:author
pubmed:issnType
Print
pubmed:volume
93
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
817-23
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
Identification of Fasciola hepatica recombinant 15-kDa fatty acid-binding protein T-cell epitopes that protect against experimental fascioliasis in rabbits and mice.
pubmed:affiliation
Laboratorio de Parasitología, Facultad de Farmacia, Universidad de Salamanca, Avda, Campo Charro s/n 37007 Salamanca, España.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't