title: On the partial suppression of IL-2 receptor expression and the prevention of lectin-induced lymphoblast formation by cyclosporine A.
abstract: The effect of cyclosporine A (CyA) on the expression of the Tac-antigen (IL-2 receptor) on PHA-activated PBMNC was analysed by immunofluorescence. In the initial experiments we determined the number of Tac(+) cells, disregarding cell size; we found that CyA did not affect the number of cells expressing the Tac antigen after lectin stimulation (Fig. 1, Table 1). When we found that comparable numbers of Tac(+)-lymphocytes absorbed less IL-2 when grown in CyA as compared to solvent controls, we analysed in more detail the correlation between Tac-antigen expression and cell size of cell populations grown in CyA. It was found that CyA prevented a majority of PHA-activated PBMNC to undergo blastogenesis despite having expressed the IL-2 receptor. A minority of the cells, however, were refractory to the CyA-mediated suppression of blast formation. Studies analysing the Tac antigen expression semiquantitatively showed that CyA reduced the intensity of Tac antigen expression on cells of all sizes.
mesh_terms: D003524:Cyclosporins / Q000494:pharmacology*; D005455:Fluorescent Antibody Technique; D006801:Humans; D066298:In Vitro Techniques; D007376:Interleukin-2 / Q000276:immunology; D007958:Leukocyte Count; D007962:Leukocytes / Q000276:immunology; D008213:Lymphocyte Activation / Q000187:drug effects*; D011948:Receptors, Antigen, T-Cell / Q000276:immunology*; D011971:Receptors, Immunologic / Q000276:immunology*; D015375:Receptors, Interleukin-2; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology
chemical_list: D003524:Cyclosporins; D007376:Interleukin-2; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2