Journal Article

Genome-Wide Transcriptional Profiling of Skin and Dorsal Root Ganglia after Ultraviolet-B-Induced Inflammation

Geisslinger, Gerd, Orengo, Christine, Perkins, James R., Schmid, Ramona, McMahon, Stephen B., Antunes-Martins, Ana, Sisignano, Marco, Hildebrandt, Tobias, Bennett, David L., Dawes, John M., Rust, Werner, Paterson, Kathryn J.

2014

Overview

Ultraviolet-B (UVB)-induced inflammation produces a dose-dependent mechanical and thermal hyperalgesia in both humans and rats, most likely via inflammatory mediators acting at the site of injury. Previous work has shown that the gene expression of cytokines and chemokines is positively correlated between species and that these factors can contribute to UVB-induced pain. In order to investigate other potential pain mediators in this model we used RNA-seq to perform genome-wide transcriptional profiling in both human and rat skin at the peak of hyperalgesia. In addition we have also measured transcriptional changes in the L4 and L5 DRG of the rat model. Our data show that UVB irradiation produces a large number of transcriptional changes in the skin: 2186 and 3888 genes are significantly dysregulated in human and rat skin, respectively. The most highly up-regulated genes in human skin feature those encoding cytokines (IL6 and IL24), chemokines (CCL3, CCL20, CXCL1, CXCL2, CXCL3 and CXCL5), the prostanoid synthesising enzyme COX-2 and members of the keratin gene family. Overall there was a strong positive and significant correlation in gene expression between the human and rat (R = 0.8022). In contrast to the skin, only 39 genes were significantly dysregulated in the rat L4 and L5 DRGs, the majority of which had small fold change values. Amongst the most up-regulated genes in DRG were REG3B, CCL2 and VGF. Overall, our data shows that numerous genes were up-regulated in UVB irradiated skin at the peak of hyperalgesia in both human and rats. Many of the top up-regulated genes were cytokines and chemokines, highlighting again their potential as pain mediators. However many other genes were also up-regulated and might play a role in UVB-induced hyperalgesia. In addition, the strong gene expression correlation between species re-emphasises the value of the UVB model as translational tool to study inflammatory pain.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Analysis / Animals / Antigens, Neoplasm - metabolism / Biology and Life Sciences / Biomarkers, Tumor - metabolism / CCL20 protein / CCL3 protein / Chemokine CCL2 - metabolism / Chemokines / Correlation / Cyclooxygenase-2 / Cytokines / Dorsal root ganglia / Experiments / Ganglia / Ganglia, Spinal - metabolism / Ganglia, Spinal - pathology / Ganglia, Spinal - radiation effects / Gene expression / Gene Expression Profiling / Gene Expression Regulation - radiation effects / Genes / Genetic transcription / Genome - genetics / Genomes / Health aspects / Humans / Hyperalgesia / Inflammation / Inflammation - genetics / Inflammation - pathology / Interleukin 24 / Interleukin 6 / Irradiation / Keratin / Lectins, C-Type - metabolism / Ligands / Male / Medicine and Health Sciences / Models, Biological / Molecular biology / Monocyte chemoattractant protein 1 / Neurosciences / Nonsteroidal anti-inflammatory drugs / Pain / Pain perception / Pancreatitis-Associated Proteins / Physical sciences / Proteins / Rats / Rats, Wistar / Reference Standards / Reproducibility of Results / Research and Analysis Methods / Ribonucleic acid / RNA / Rodents / Sequence Analysis, RNA / Skin / Skin - metabolism / Skin - pathology / Skin - radiation effects / Transcription / Transcription, Genetic - radiation effects / Ultraviolet radiation / Ultraviolet Rays / Up-Regulation - genetics / Up-Regulation - radiation effects