title: Dichotomy in the tissue origin of schistosome acquired class I and class II major histocompatibility complex antigens.
abstract: Schistosoma mansoni schistosomula recovered from the lungs of mice have previously been shown to express host-derived class I and class II major histocompatibility complex (MHC) antigens. To investigate the tissue origin of parasite-acquired MHC products, lung-stage schistosomula were obtained from a series of parent leads to F1 and F1 leads to parent bone marrow chimeras and the parasites typed by immunofluorescence for the presence of haplotype-specific K region and I region MHC determinants. The results of these experiments indicated that, despite their intravascular residence in the host, schistosomula derive all of their class I antigen from a nonhemapoietic tissue source. In contrast, the class II antigens expressed on the surface of schistosomula were found to originate from bone marrow-derived donor cells. These results support the hypothesis that MHC product acquisition by schistosomes involves selective and specific interactions with host tissue and, in the case of class I antigens, suggest that the endothelium may be a major site of host molecule uptake for the parasite.
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000276:immunology; D001854:Bone Marrow Cells; D016026:Bone Marrow Transplantation; D006183:H-2 Antigens / Q000235:genetics / Q000276:immunology*; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000276:immunology; D064532:Histocompatibility Antigen H-2D; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D008168:Lung / Q000276:immunology / Q000469:parasitology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D011828:Radiation Chimera; D012550:Schistosoma mansoni / Q000254:growth & development / Q000276:immunology; D012552:Schistosomiasis / Q000097:blood / Q000276:immunology* / Q000469:parasitology
chemical_list: D006183:H-2 Antigens; D064532:Histocompatibility Antigen H-2D; D000949:Histocompatibility Antigens Class II