Characterization of the murine T cell surface molecule, designated L3T4, identified by monoclonal antibody GK1.5: similarity of L3T4 to the human Leu-3/T4 molecule - PubMed (original) (raw)
Comparative Study
. 1983 Nov;131(5):2445-51.
- PMID: 6415170
Comparative Study
Characterization of the murine T cell surface molecule, designated L3T4, identified by monoclonal antibody GK1.5: similarity of L3T4 to the human Leu-3/T4 molecule
D P Dialynas et al. J Immunol. 1983 Nov.
Abstract
Monoclonal antibody GK1.5 recognizes a previously undescribed murine T cell surface molecule, designated L3T4, which migrates on SDS-PAGE under reducing conditions as a single band with an apparent m.w. of 52,000. L3T4 is expressed by approximately 80% of thymocytes and by approximately 20% of spleen cells. There appears to be poor correlation between expression of L3T4 by functional T cell clones and expression of Lyt-2, expression of the cytolytic phenotype, and class I MHC antigen reactivity. On the other hand, both a class II MHC antigen-reactive HTL clone and an Lyt-1- Mls-reactive HTL clone express L3T4. Analysis of the effect of mAb GK1.5 on PFC responses in adoptive transfer suggests that L3T4 is expressed by the helper/inducer subset of murine T cells. Expression of L3T4 by murine T cells, however, may correlate primarily with class II MHC antigen reactivity rather than with functional phenotype; mAb GK1.5 profoundly blocks antigen-specific cytolysis by the cloned class II MHC antigen-reactive CTL line A15-1.17. Antigen-specific cytolysis by A15-1.17 is blocked by mAb GK1.5 at a step before the lethal hit. Collectively, the flow cytometric, functional, and biochemical data indicate that L3T4 is similar to the human Leu-3/T4 molecule.
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