Human interleukin 2 analogues that preferentially bind the intermediate-affinity interleukin 2 receptor lead to reduced secondary cytokine secretion: implications for the use of these interleukin 2 analogues in cancer immunotherapy.
Cancer patients undergoing interleukin (IL)-2-based immunotherapy frequently experience dose-limiting side effects believed to be caused by the actions of such cytokines as IL-1 beta, tumor necrosis factor (TNF)-alpha and -beta, and interferon-gamma (IFN-gamma). Human peripheral blood mononuclear cells (PBMC) or monocyte-depleted peripheral blood lymphocytes were stimulated for up to 7 days by either of 2 IL-2 analogues (R38A or F42K) that bind to the intermediate-affinity IL-2 beta gamma receptor but have reduced abilities to bind the high-affinity IL-2 receptor. We previously reported that these IL-2 analogues retain the ability to generate lymphokine-activated killing by PBMC. In this study, we analyzed the cytokine content of supernatants from stimulated PBMC and peripheral blood lymphocyte cultures by enzyme-linked immunosorbent assay. The secretions of IL-1 beta, TNF-alpha, and -beta, and IFN-gamma induced by either R38A or F42K were markedly reduced compared with secretions produced in response to recombinant wild-type IL-2. In 4 experiments, secretion was reduced an average of 39% for IL-1 beta, 57% for TNF-alpha, 83% for TNF-beta, and 86% for IFN-gamma. Polymerase chain reaction analysis of recombinant wild-type IL-2 or analogue-stimulated PBMC did not reveal the presence of IL-2 mRNA; thus, differential production of endogenous IL-2 could not account for these findings. These data suggest the interaction of IL-2 and the high-affinity IL-2 receptor on human PBMC or peripheral blood lymphocyte is required for maximal secretion of IL-1 beta, TNF-alpha, TNF-beta, and IFN-gamma. Because such cytokines are believed to mediate the toxicity seen with IL-2-based immunotherapies, IL-2 analogues with reduced binding to the high affinity IL-2 receptor may prove to be an effective and less toxic means of cancer treatment.
Department of Tumor Biology, University of Texas M. D. Anderson Cancer Center, Houston 77030.
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D001483:Base Sequence; D006801:Humans; D007371:Interferon-gamma / Q000378:metabolism*; D007375:Interleukin-1 / Q000378:metabolism*; D007376:Interleukin-2 / Q000031:analogs & derivatives / Q000378:metabolism / Q000494:pharmacology*; D015979:Killer Cells, Lymphokine-Activated / Q000276:immunology; D008969:Molecular Sequence Data; D009000:Monocytes / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D015375:Receptors, Interleukin-2 / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism*
D007375:Interleukin-1; D007376:Interleukin-2; D012333:RNA, Messenger; D015375:Receptors, Interleukin-2; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma