title: Phylogeny of immune recognition: processing and presentation of structurally defined proteins in channel catfish immune responses.
abstract: This work was undertaken to investigate whether or not antigen processing and presentation are important in channel catfish in vitro secondary immune responses elicited with structurally defined proteins, namely, pigeon heart cytochrome C (pCytC), hen egg lysozyme, and horse myoglobin. The use of in vitro antigen-pulsed and fixed B cells or monocytes as antigen presenting cells (APC) resulted in autologous peripheral blood leukocytes (PBL) responding with vigorous proliferation and antibody production in vitro. In addition, several long-term catfish monocyte lines have been found to function as efficient APC with autologous but not allogeneic responders. Subsequent separation of the responding PBL into sIg- (T-cell-enriched) and B (sIg+) cells subsets showed that both underwent proliferative responses to antigen-pulsed and fixed APC. Moreover, allogeneic cells used as APC were found to induce only strong mixed leukocyte reactions without specific in vitro antibody production. Initial attempts at identifying the immunogenic region(s) of the protein antigens for catfish indicated there are two such regions for pCytC, namely, peptides 66-80 and 81-104.
authors.affiliation: Department of Microbiology, University of Mississippi Medical Center, Jackson 39216-4505.
authors.forename: A N
authors.initials: AN
authors.lastname: Vallejo
authors.forename: N W
authors.initials: NW
authors.lastname: Miller
authors.forename: L W
authors.initials: LW
authors.lastname: Clem
mesh_terms: D000818:Animals; D000917:Antibody Formation; D000938:Antigen-Presenting Cells / Q000276:immunology* / Q000378:metabolism; D000941:Antigens / Q000276:immunology / Q000378:metabolism*; D002460:Cell Line; D002645:Chickens / Q000276:immunology; D010856:Columbidae / Q000276:immunology; D003574:Cytochrome c Group / Q000276:immunology*; D006736:Horses / Q000276:immunology; D007059:Ictaluridae / Q000276:immunology*; D007114:Immunization; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D008214:Lymphocytes / Q000276:immunology; D009000:Monocytes / Q000276:immunology; D009113:Muramidase / Q000276:immunology*; D009211:Myoglobin / Q000276:immunology*; D010446:Peptide Fragments / Q000276:immunology; D010802:Phylogeny; D013045:Species Specificity
chemical_list: D000941:Antigens; D003574:Cytochrome c Group; D009211:Myoglobin; D010446:Peptide Fragments; D009113:Muramidase