Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

OX40L protects against inflammation-driven fibrosis

ABSTRACT: Fibrosis is a leading cause of deaths in industrialized countries and has no effective therapy. We demonstrated that blockade of OX40L prevented inflammation-driven fibrosis affecting the skin and the lungs and promotes regression of established dermal fibrosis in different murine models. To characterize the pathways involved in the protection of skin fibrosis and affected by OX40L blocking, we used microarrays and identified distinct genes differentially expressed between ox40l+/+ and ox40l-/- in the bleomycin-induced dermal fibrosis mouse model. Total RNA were extracted from lesional skin samples of 3 ox40l+/+ and 4 ox40l-/- male mice aged 9 weeks treated with bleomycin for 3 weeks, and were hybridized on Affymetrix microarrays.

ORGANISM(S): Mus musculus

SUBMITTER: Florent Dumont

PROVIDER: E-GEOD-73705 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

OX40L blockade protects against inflammation-driven fibrosis.

Elhai Muriel M Avouac Jérôme J Hoffmann-Vold Anna Maria AM Ruzehaji Nadira N Amiar Olivia O Ruiz Barbara B Brahiti Hassina H Ponsoye Matthieu M Fréchet Maxime M Burgevin Anne A Pezet Sonia S Sadoine Jérémy J Guilbert Thomas T Nicco Carole C Akiba Hisaya H Heissmeyer Vigo V Subramaniam Arun A Resnick Robert R Molberg Øyvind Ø Kahan André A Chiocchia Gilles G Allanore Yannick Y

Proceedings of the National Academy of Sciences of the United States of America 20160613 27

Treatment for fibrosis represents a critical unmet need, because fibrosis is the leading cause of death in industrialized countries, and there is no effective therapy to counteract the fibrotic process. The development of fibrosis relates to the interplay between vessel injury, immune cell activation, and fibroblast stimulation, which can occur in various tissues. Immunotherapies have provided a breakthrough in the treatment of immune diseases. The glycoprotein OX40-OX40 ligand (OX40L) axis offe ...[more]

PMID: 27298374

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Project description:Collagen deposition is a key process during idiopathic pulmonary fibrosis (IPF); however, little is known about the dynamics of collagen formation during disease development. Tissue samples of early stages of human disease are not readily available and it is difficult to identify changes in collagen content, since standard collagen analysis does not distinguish between 'old' and 'new' collagen. Therefore, the current study aimed to (i) investigate the dynamics of new collagen formation in mice using bleomycin-induced lung fibrosis in which newly synthesized collagen was labelled with deuterated water and (ii) use this information to identify genes and processes correlated to new collagen formation from gene expression analysis. Lung fibrosis was induced in female C57BL/6 mice by bleomycin instillation and sacrificed. Animals were sacrificed at 1 to 5 weeks after fibrosis induction. Collagen synthesized during the week before sacrifice was labelled with deuterium by providing mice with deuterated drinking water. After sacrifice, lung tissue was collected for microarray analysis, determination of new collagen formation, and histology. Deuterated water labelling showed a strong increase in new collagen formation already during the first week after fibrosis induction and a complete return to baseline at five weeks. Correlation of new collagen formation data with gene expression data revealed fibrosis specific processes, of which proliferation was an unexpected one. This was confirmed by measuring cell proliferation and collagen synthesis simultaneously using deuterated water incorporation. Furthermore, new collagen formation strongly correlated with gene expression of e.g. elastin, tenascin C, MMP-14, lysyl oxidase, and type V collagen. These data demonstrate, using a novel combination of technologies, that proliferation and extracellular matrix production are correlated to the core process of fibrosis, i.e. the formation of new collagen. In addition, it identified genes directly correlated to fibrosis, thus providing more insight into the aetiology of IPF. Total RNA was obtained from mouse lungs at timepoint 0 as a control (n = 7) or timepoints 1 (n = 7), 2 (n = 6), 3 (n = 6), 4 (n = 6) or 5 (n = 6) weeks after bleomycin-instillation to induce lung fibrosis.

Dataset Information

OX40L protects against inflammation-driven fibrosis

Publications

OX40L blockade protects against inflammation-driven fibrosis.

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