Preferential Production of Interleukin-1 Beta over Interleukin-1 Receptor Antagonist Contributes to Proliferation and Suppression of Apoptosis in Leukemic Cells
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Normal human monocytes were isolated in a nascent state by centrifugal elutriation and used for the study of interleukin-1 (IL-1) and interleukin-1 receptor antagonist (IL-1ra) expression. Neither IL-1 beta nor IL-1ra mRNA was present in monocytes just after the isolation, but they were induced simultaneously in response to various stimulants. In contrast, only IL-1 beta mRNA was expressed in monocytic leukemia cell line JOSK-1, while little or no IL-1ra mRNA was detected even after stimulation. Dominant expression of IL-1 beta over IL-1ra was also observed in fresh leukemia cells including monocytic leukemias, i.e., IL-1 beta mRNA was constitutively expressed in 26 out of 36 cases (72.2%), whereas IL-1ra mRNA was present only in 8 cases (22.2%). The signal intensity of IL-1 beta mRNA was stronger than that of IL-1ra even in IL-1ra-positive cases. Apoptotic cell death of monocytes was significantly inhibited by IL-1 beta, and it was enhanced by IL-1ra. In fresh leukemia cells, 3H-thymidine uptake was generally higher in IL-1-producing cases than in IL-1ra-producing cases, and was increased by the addition of IL-1 beta in all cases tested. Cell proliferation was inhibited by either IL-1ra or anti-IL-1 beta antibody in IL-1-producing cases, while it was enhanced by anti-IL-1ra antibody in IL-1ra-producing cases. These results suggest that the balance between IL-1 and IL-1ra is necessary for homeostasis of the mononuclear phagocytosis system. The imbalance between these two counter-acting cytokines might contribute to the altered growth and accumulation of leukemic cells.
Xie Z, Li X, He Y, Wu S, Wang S, Sun J BMC Cancer. 2020; 20(1):1143.
PMID: 33238942 PMC: 7687764. DOI: 10.1186/s12885-020-07620-8.
Perrier S, Kherratia B, Deschaumes C, Ughetto S, Kemeny J, Baudet-Pommel M Clin Exp Immunol. 2002; 127(1):53-9.
PMID: 11882032 PMC: 1906287. DOI: 10.1046/j.1365-2249.2002.01685.x.
Sumitomo M, Tachibana M, Murai M, Hayakawa M, Nakamura H, Takayanagi A Br J Cancer. 1999; 81(2):277-86.
PMID: 10496353 PMC: 2362876. DOI: 10.1038/sj.bjc.6690688.