Post-transcriptional regulation of UV induced TNF-alpha expression

The Journal of Investigative Dermatology
M LeverkusB A Gilchrest

Abstract

Ultraviolet (UV) irradiation exerts multiple effects on skin cells, including the induction of several cytokines involved in immunomodulation. Specifically, UV irradiation has been shown to upregulate the level of tumor necrosis factor-alpha (TNF-alpha) mRNA in keratinocytes. To determine whether the induction of TNF-alpha mRNA is regulated by transcriptional or post-transcriptional mechanisms, we examined cells of keratinocytic lineage (SCC12F) for steady state level, transcription rate, and stability of TNF-alpha mRNA after UV irradiation. Within 4 h there was a 20-40-fold induction of TNF-alpha mRNA that persisted at lower levels through 48 h. Consistently, TNF-alpha protein secretion increased at 24 and 48 h after UV irradiation. UV irradiation increased the half-life of TNF-alpha mRNA from approximately 35 min to approximately 10 h. Conversely, the transcription rate of the TNF-alpha gene increased < 2-fold at the time of peak mRNA steady state levels. Thus, post-transcriptional mechanisms play a major role in UV induced TNF-alpha transcript level.

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Citations

Mar 21, 2008·Photochemistry and Photobiology·Gary M Halliday, J Guy Lyons
Oct 12, 2007·The Journal of Investigative Dermatology·Jeffrey B TraversRaymond L Konger
Jul 4, 2003·The Journal of Investigative Dermatology·Martin LeverkusManfred Neumann
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Mar 11, 2004·Experimental Dermatology·Dan LuoBarbara A Gilchrest
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