Abstract
We report that mouse L cells expressing Ak class II molecules on their surface after DNA-mediated gene transfer are capable of presenting the synthetic copolymer (Glu60 Ala30 Tyr10) to Ak-restricted long-term T-cell clones. Antigen-induced T-cell stimulation could be inhibited by monoclonal antibodies (mAb) directed at spatially distinct determinants of the α and/or β subunits of the Ak molecule, and by the rat L3T4-specific mAb H129.19. In contrast, several rat mAb reactive with the mouse LFA-1 molecule failed to inhibit T-cell activation when L cells were used as antigen-presenting cells (APC), although these mAb strongly inhibited the same T-cell responses in the presence of leukocytic APC. Similarly, the cytolytic activity of the Ak-specific T-cell clone A15.1.17 was blocked by L3T4-specific and by LFA-1-specific mAb when tested on Ak-positive B-cell hybridomas, but only by L3T4-specific mAb and not by LFA-1-specific mAb when Ak-positive L-cell transformants were used as targets. These data support the notion that the LFA-1 molecule is not necessary for T-cell activation, and suggest that its functional role as an accessory molecule depends on the leukocytic nature of the APC tested.
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Naquet, P., Malissen, B., Bekkhoucha, F. et al. L3T4 but not LFA-1 participates in antigen presentation by Ak-positive L-Cell transformants. Immunogenetics 22, 247–256 (1985). https://doi.org/10.1007/BF00404484
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DOI: https://doi.org/10.1007/BF00404484