title: Protection induced by vaccinating sheep with a thiol-binding extract of Haemonchus contortus membranes is associated with its protease components.
abstract: Previous work has shown that a protein extract enriched for cysteine protease activity (TSBP) prepared from adult Haemonchus contortus using thiol sepharose affinity chromatography confers substantial protection against a single challenge infection. TSBP comprised proteases and other proteins. Here, TSBP were further fractionated using anion-exchange chromatography and fractions pooled on the basis of containing (1) protease activity, (2) a prominent non-protease peptide and (3) material which did not bind to the column. A protection trial showed that only the protease-enriched material conferred protective immunity and this was comparable to that observed in a TSBP-immunized positive control group. Immunization stimulated a marked IgG response with the IgG2 isotype predominating.
authors.affiliation: Moredun Research Institute, Pentlands Science Park, Bush Loan, Penicuik, Midlothian, UK. knoxd@mri.sari.ac.uk
authors.forename: D P
authors.initials: DP
authors.lastname: Knox
authors.forename: S K
authors.initials: SK
authors.lastname: Smith
authors.forename: D L
authors.initials: DL
authors.lastname: Redmond
authors.forename: W D
authors.initials: WD
authors.lastname: Smith
mesh_terms: D000818:Animals; D000909:Antibodies, Helminth / Q000097:blood; D000947:Antigens, Helminth / Q000737:chemistry / Q000276:immunology / Q000302:isolation & purification; D003546:Cysteine Endopeptidases / Q000276:immunology* / Q000302:isolation & purification; D004797:Enzyme-Linked Immunosorbent Assay; D005243:Feces / Q000469:parasitology; D006188:Haemonchiasis / Q000276:immunology / Q000517:prevention & control / Q000662:veterinary*; D006189:Haemonchus / Q000276:immunology*; D015801:Helminth Proteins / Q000276:immunology* / Q000302:isolation & purification; D007074:Immunoglobulin G / Q000097:blood; D010270:Parasite Egg Count; D012756:Sheep; D012757:Sheep Diseases / Q000276:immunology / Q000517:prevention & control*; D014611:Vaccination / Q000662:veterinary; D022223:Vaccines, Subunit / Q000737:chemistry / Q000276:immunology*
chemical_list: D000909:Antibodies, Helminth; D000947:Antigens, Helminth; D015801:Helminth Proteins; D007074:Immunoglobulin G; D022223:Vaccines, Subunit; D003546:Cysteine Endopeptidases