TNF-α suppresses the expression of clock genes by interfering with E-box-mediated transcription
-
Cavadini, Gionata
Division of Clinical Immunology, University Hospital Zurich, Switzerland
-
Petrzilka, Saskia
Division of Clinical Immunology, University Hospital Zurich, Switzerland
-
Kohler, Philipp
Division of Clinical Immunology, University Hospital Zurich, Switzerland
-
Jud, Corinne
Institute of Biochemistry, University of Fribourg, Switzerland
-
Tobler, Irene
Institute of Pharmacology and Toxicology, University of Zurich, Switzerland
Show more…
Published in:
- Proceedings of the National Academy of Sciences of the United States of America. - 2007, vol. 104, no. 31, p. 12843-12848
English
Production of TNF-α and IL-1 in infectious and autoimmune diseases is associated with fever, fatigue, and sleep disturbances, which are collectively referred to as sickness behavior syndrome. In mice TNF-α and IL-1 increase nonrapid eye movement sleep. Because clock genes regulate the circadian rhythm and thereby locomotor activity and may alter sleep architecture we assessed the influence of TNF-α on the circadian timing system. TNF-α is shown here to suppress the expression of the PAR bZip clock-controlled genes Dbp, Tef, and Hlf and of the period genes Per1, Per2, and Per3 in fibroblasts in vitro and in vivo in the liver of mice infused with the cytokine. The effect of TNF-α on clock genes is shared by IL-1β, but not by IFN-α, and IL-6. Furthermore, TNF-α interferes with the expression of Dbp in the suprachiasmatic nucleus and causes prolonged rest periods in the dark when mice show spontaneous locomotor activity. Using clock reporter genes TNF-α is found here to inhibit CLOCK-BMAL1-induced activation of E-box regulatory elements-dependent clock gene promoters. We suggest that the increase of TNF-α and IL-1β, as seen in infectious and autoimmune diseases, impairs clock gene functions and causes fatigue.
-
Faculty
- Faculté des sciences et de médecine
-
Department
- Département de Médecine
-
Language
-
-
Classification
-
Biological sciences
-
License
-
License undefined
-
Identifiers
-
-
Persistent URL
-
https://folia.unifr.ch/unifr/documents/300468
Statistics
Document views: 61
File downloads: