Comparison of purified 12 kDa and recombinant 15 kDa Fasciola hepatica antigens related to a Schistosoma mansoni fatty acid binding protein.
Vaccines in schistosomiasis using homologous antigens have been studied extensively in experimentally infected mammalian hosts. Vaccines using heterologous antigens have received comparatively less attention. This review summarizes recent work on a heterologous 12 kDa Fasciola hepatica antigenic polypeptide which cross reacts with Schistosoma mansoni. A cDNA has been cloned and sequenced, and the predicted amino acid sequence of the recombinant protein has been shown to have significant (44%) identity with a 14 kDa S. mansoni fatty acid binding protein. Thus in the parasitic trematodes fatty acid binding proteins may be potential vaccine candidates. The F. hepatica recombinant protein has been overexpressed and purified and denoted rFh15. Preliminary rFh15 migrates more slowly (i.e. may be slightly larger) than nFh12 on SDS-PAGE and has a predicted pI of 6.01 vs. observed pI of 5.45. Mice infected with F. hepatica develop antibodies to nFh12 by 2 weeks of infection vs. 6 weeks of infection to rFh15; on the other hand, mice with schistosomiasis mansoni develop antibodies to both nFh12 and rFh15 by 6 weeks of infection. Both the F. hepatica and S. mansoni cross-reactive antigens may be cross-protective antigens with the protection inducing capability against both species.
Department of Pathology and Laboratory Medicine, UPR School of Medicine, San Juan.
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Hillyer
D000595:Amino Acid Sequence; D000818:Animals; D000947:Antigens, Helminth / Q000276:immunology* / Q000302:isolation & purification; D015478:Antigens, Heterophile / Q000276:immunology* / Q000302:isolation & purification; D002352:Carrier Proteins / Q000276:immunology*; D005210:Fasciola hepatica / Q000276:immunology*; D005211:Fascioliasis / Q000276:immunology; D000071438:Fatty Acid-Binding Protein 7; D050556:Fatty Acid-Binding Proteins; D005227:Fatty Acids / Q000276:immunology*; D051379:Mice; D008969:Molecular Sequence Data; D018996:Myelin P2 Protein / Q000276:immunology*; D009363:Neoplasm Proteins; D009419:Nerve Tissue Proteins; D011817:Rabbits; D012550:Schistosoma mansoni / Q000276:immunology*; D012555:Schistosomiasis mansoni / Q000276:immunology; D014614:Vaccines, Synthetic / Q000276:immunology
D000947:Antigens, Helminth; D015478:Antigens, Heterophile; D002352:Carrier Proteins; C082667:Fabp5 protein, mouse; C086936:Fabp7 protein, mouse; D000071438:Fatty Acid-Binding Protein 7; D050556:Fatty Acid-Binding Proteins; D005227:Fatty Acids; D018996:Myelin P2 Protein; D009363:Neoplasm Proteins; D009419:Nerve Tissue Proteins; D014614:Vaccines, Synthetic