Clock Gene Modulation by TNF-α Depends on Calcium and p38 MAP Kinase Signaling

Abstract

A 24-h treatment with the cytokine tumor necrosis factor-α (TNF-α) suppresses transcription of E-box—driven clock genes (D-site albumin promoter binding protein, Dbp; Tyrotroph embryonic factor, Tef ; Hepatic leukemia factor, Hlf; Period homolog to Drosophila 1/2/3, Per1, Per2, and Per3) by yet unknown molecular mechanisms. The attenuation of clock genes has been suggested as a putative cause for the development of sickness behavior syndrome in infectious and autoimmune diseases. Here, the authors studied the effect of TNF-α at early time points (<3 h) on intracellular signaling events and clock gene expression in fibroblasts. Interaction of TNF-α with TNFR1 (Tnfrsf1a , CD120a, p55), but not TNFR2 (Tnfrsf1b, CD120b , p75), leads to fast downregulation of gene expression of Dbp and upregulation of negative regulators of the molecular clock, Per1 and Per2, Cryptochrome-1 (Cry1), and Differentiated embryo chondrocytes-1 (Dec1). Since the decrease of Dbp is also observed in cells deficient for Per1/Per2, Cry1/Cry2 , or Dec1, these genes are unlikely to be responsible for inhibition of Dbp. The early effect of TNF-α on the clock gene Per1 is dependent on p38, mitogen-activated protein kinase (MAPK), and/or calcium signaling, whereas the effect on Dbp is independent of p38 MAPK, but also involves calcium signaling. Both genes remain unaffected by the NF-κB and AP-1 pathway. Taken collectively these data show p38 MAPK- and calcium-dependent TNFR1-mediated transient increase of the negative regulator Per1 and an independent decrease of Dbp.

Keywords

tumor necrosis factor-α cytokines clock gene regulation inflammation D-site albumin promotor binding protein calcium p38 map kinase

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