title: Xenogeneic monoclonal antibody to an Ly-6-linked murine cell surface antigen: differential reactivity with T cell subpopulations and bone marrow cells.
abstract: The patterns of cellular and strain reactivity of a monoclonal antibody (6C3 MAb) derived from the fusion of SP2/0 cells with splenocytes from rats immunized against MRL/MpJ-lpr/lpr T cells were characterized by using flow cytofluorometry (FCF) analysis. This MAb was found to stain 70 to 90% of T cells of mice with the lpr/lpr genotype and 20 to 60% of T cells of congenic +/+ strains. Dual-parameter FCF analysis of Lyt-2 vs 6C3 expression revealed the existence of several Lyt-2- and Lyt-2+ T cell subsets, one of which (Lyt-2- bright 6C3+) was expanded in lpr/lpr-bearing mice. The 6C3 MAb stained only 2 to 5% normal thymocytes but reacted with 40 to 50% bone marrow (BM) cells. A strain survey demonstrated the expression of the 6C3 antigen on peripheral T cells (and BM cells) of all strains examined, with the exception of NOD, NZB/B1NJ, and ST/bJ. Interestingly, in the positive strains, two types of 6C3 staining patterns of T cells were observed: bimodal or trimodal. Study of BXH and CXB recombinant inbred (RI) strains demonstrated that the bimodal and trimodal 6C3 patterns are associated with the Ly-6.1 and Ly-6.2 phenotypes, respectively. Linkage of 6C3 expression with the Ly-6 locus was confirmed by using the congenic C3H.B6-Ly-6b strain. Moreover, the 6C3 staining of T cells in Ly-6.2 strains was reduced by preincubation with the H9/25 and SK-142-446 MAb, which are known to recognize Ly-6.2-associated antigens. Therefore, the 6C3 MAb appears to detect a frame-work determinant on an Ly-6-linked antigen that is absent from T cells of NOD, NZB, and ST/bJ mice. Analysis of (NZB x C58) NX8 RI strains demonstrated a correlation between the lack of 6C3 expression on T cells and unresponsiveness in autologous mixed lymphocyte reaction (a property of NZB/B1NJ mice). The 6C3 MAb should prove useful for further genetic and biochemical analysis of the Ly-6 locus and its product(s), and for the delineation of functional subsets of T cells and BM cells in normal and lpr/lpr-bearing mice.
authors.forename: F J
authors.initials: FJ
authors.lastname: Dumont
authors.forename: L Z
authors.initials: LZ
authors.lastname: Coker
authors.forename: R C
authors.initials: RC
authors.lastname: Habbersett
authors.forename: J A
authors.initials: JA
authors.lastname: Treffinger
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000937:Antigen-Antibody Reactions; D000950:Antigens, Ly / Q000032:analysis / Q000235:genetics* / Q000276:immunology; D001854:Bone Marrow Cells; D008198:Lymph Nodes / Q000166:cytology; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D010641:Phenotype; D051381:Rats; D011917:Rats, Inbred Lew; D011995:Recombination, Genetic; D013045:Species Specificity; D013601:T-Lymphocytes / Q000145:classification* / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000950:Antigens, Ly