Blocking of melatonin synthesis and MT(1) receptor impairs the activation of Jurkat T cells.

Authors: Lardone PJ, Rubio A, Cerrillo I, Gómez-Corvera A, Carrillo-Vico A, Sanchez-Hidalgo M, Guerrero JM, Fernandez-Riejos P, Sanchez-Margalet V, Molinero P
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 MT(1) 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. Likew…

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