Abstract
Melatonin has been proposed as regulating the immune system by affecting cytokine production in immunocompetent cells, enhancing the production of several T helper (Th)1 cytokines. To further investigate the melatonin’s role in IL-2/IL-2R system, we established an inducible T-REx expression system in Jurkat cells in which the protein levels of HIOMT enzyme or MT1 receptor were significantly down-regulated upon tetracycline incubation. We found that T-REx Jurkat cells with lower levels of HIOMT activity, and consequently lower content of endogenous melatonin, showed IL-2 production decrease after activation with lectin. Likewise, tetracycline-inducible stable cell line expressing MT1 antisense produced decreased amounts of IL-2 (mRNA and protein levels) after stimulation. Moreover, in T-Rex-MT1 cells incubated with tetracycline, a sub-optimal PHA dose failed to induce the early activation marker CD25 on the cell surface. The results shown here support the relevance of endogenous melatonin and its signaling in T cell activation.
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Acknowledgments
This paper was supported by grants from Ministerio de Sanidad FIS (06/0091) and Red-FIS (RD06/0013/0001) and Grupo Excelencia del Plan Andaluz de Investigacion (P06-CTS-01604).
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P. J. Lardone and A. Rubio contributed equally to this work.
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Lardone, P.J., Rubio, A., Cerrillo, I. et al. Blocking of melatonin synthesis and MT1 receptor impairs the activation of Jurkat T cells. Cell. Mol. Life Sci. 67, 3163–3172 (2010). https://doi.org/10.1007/s00018-010-0374-y
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DOI: https://doi.org/10.1007/s00018-010-0374-y