title: Isolation and characterization of a protective antigen for adjuvant-free immunization against Schistosoma mansoni.
abstract: A single, 68,000 m.w. glycoprotein antigen from adult Schistosoma mansoni was purified by immunoaffinity chromatography with the use of a newly developed, protective, anti-schistosome murine monoclonal antibody. Immunization with two doses of 0.5 microgram or 1 microgram of purified antigen, without adjuvants, afforded a mean 28% reduction in parasite recovery in CF1 mice, and 2-% reduction in parasite BALB/c mice. On immunoblotting, the 68,000 m.w. antigen was common to S. mansoni adults and schistosomula, whereas parasite eggs contained only cross-reacting low m.w. antigens of 19,100 and 16,000. Immunization resulted in the development of anti-antigen antibody and enhanced immediate cutaneous hypersensitivity to the 31-3B6 antigen. By contrast, delayed-type hypersensitivity and sensitization to circumoval granuloma formation were not observed in immunized mice. It was concluded that the 68,000 m.w. 31-3B6 antigen represents a candidate vaccine for adjuvant-free immunization against S. mansoni.
mesh_terms: D000818:Animals; D000909:Antibodies, Helminth / Q000276:immunology*; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000947:Antigens, Helminth / Q000276:immunology / Q000302:isolation & purification*; D002846:Chromatography, Affinity; D005260:Female; D006023:Glycoproteins / Q000276:immunology / Q000302:isolation & purification; D007114:Immunization; D007116:Immunization, Passive; D051379:Mice; D008807:Mice, Inbred BALB C; D012550:Schistosoma mansoni / Q000254:growth & development / Q000276:immunology*; D012555:Schistosomiasis mansoni / Q000517:prevention & control
chemical_list: D000909:Antibodies, Helminth; D000911:Antibodies, Monoclonal; D000947:Antigens, Helminth; D006023:Glycoproteins