摘要：

Summary: The coupling of immunologically relevant in vitro assay systems, cell separation techniques, and the development of distinct clonal leukocyte lines has established the existence of T, B, natural killer, and accessory cell equivalents in teleosts. B cells are directly defined by monoclonal antibodies to teleost immunoglobulin (Ig) and identification of IgH and L chain genes. As in mammals, fish B cells show IgH-chain gene rearrangements, allelic exclusion, produce both membrane-bound and secreted forms of Ig, and transduce intracellular proliferative signals upon anti-Ig cross-linking. It has also been found that some fish B cells express a unique chimeric Ig chain with sequence homology to mammalian Igσ. Teleost T cells are still indirectly defined as sIg- lymphocytes due to a lack of definitive surface markers. These mig- lymphocytes are the responding cells in mixed leukocyte cultures, proliferate specifically to autologously processed and presen

展开