Interleukin-2 receptor gene expression in kidney transplant recipients treated with cyclosporin A.

We examined the effects of cyclosporin A (CsA) administered in vivo on the capacity of peripheral blood mononuclear cells (PBMC) from kidney transplant recipients to express IL-2 receptor (IL-2R) gene at the level of mRNA after mitogen stimulation in vitro. There were no differences in the percentage of IL-2R+ cells among the groups of normal individuals, azathioprine-prednisolone treated, and CsA-prednisolone-treated recipients, using FITC-labelled monoclonal anti-IL-2R antibody (anti-alpha chain): 40.3 +/- 10.1% and 62.8 +/- 11.1% of normal PBMC (n = 18), 37.0 +/- 9.3% and 61.7 +/- 5.8% of PBMC from azathioprine-prednisolone-treated recipients (n = 20), and 37.7 +/- 9.6% and 60.7 +/- 12.7% of PBMC from CsA-prednisolone-treated recipients (n = 20) expressed IL-2R after 24 h and 48 h of phytohaemagglutinin stimulation, respectively. However, in a study of Northern blotting using cDNA for IL-2R (anti-alpha chain specific), both the 3500 and 1400 bp families of IL-2R mRNA were remarkably decreased in PBMC from CsA-prednisolone-treated recipients compared with azathioprine-prednisolone-treated recipients and normal individuals. These studies demonstrated that CsA could inhibit IL-2R gene expression at the level of mRNA at physiological concentration.