Severe dysregulation of TNF expression leads to multiple inflammatory diseases and embryonic death
Bouillet, P.; Clayer, E.; Dalseno, D.; Kueh, A. J.; Lacey, D.; Tsai, M.; Carr, E.; Wimmer, V.
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Post-transcriptional regulation mechanisms regulate mRNA stability or translational efficiency via ribosomes and recent evidence indicates that it is a major determinant of the accurate levels of cytokine mRNAs. While transcriptional regulation of Tnf has been well studied and found to be important for the rapid induction of Tnf mRNA and regulation of the acute phase of inflammation, study of its post-transcriptional regulation has been largely limited to the role of the AU-rich element (ARE), and to a lesser extent, that of the constitutive decay element (CDE). We have identified a new regulatory element (NRE) in the 3 untranslated region (3UTR) of Tnf, and demonstrate that ARE, CDE and NRE cooperate to efficiently down regulate Tnf expression and prevent autoimmune inflammatory diseases. We also show for the first time that excessive TNF may lead to embryonic death.
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