Hess, Clemens Friedrich

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.journal","Journal of Cellular and Molecular Medicine"],["dc.bibliographiccitation.lastpage","9"],["dc.contributor.author","Malik, Gesa"],["dc.contributor.author","Wilting, Jörg"],["dc.contributor.author","Hess, Clemens Friedrich"],["dc.contributor.author","Ramadori, Giuliano"],["dc.contributor.author","Malik, Ihtzaz Ahmed"],["dc.date.accessioned","2019-07-09T11:50:04Z"],["dc.date.available","2019-07-09T11:50:04Z"],["dc.date.issued","2019"],["dc.description.abstract","The mechanisms of radiation-induced liver damage are poorly understood. We investigated if tumour necrosis factor (TNF)-α acts synergistically with irradiation, and how its activity is influenced by platelet endothelial cell adhesion molecule-1 (PECAM-1). We studied murine models of selective single-dose (25 Gy) liver irradiation with and without TNF-α application (2 μg/mouse; i.p.). In serum of wild-type (wt)-mice, irradiation induced a mild increase in hepatic damage marker aspartate aminotransferase (AST) in comparison to sham-irradiated controls. AST levels further increased in mice treated with both irradiation and TNF-α. Accordingly, elevated numbers of leucocytes and increased expression of the macrophage marker CD68 were observed in the liver of these mice. In parallel to hepatic damage, a consecutive decrease in expression of hepatic PECAM-1 was found in mice that received radiation or TNF-α treatment alone. The combination of radiation and TNF-α induced an additional significant decline of PECAM-1. Furthermore, increased expression of hepatic lipocalin-2 (LCN-2), a hepatoprotective protein, was detected at mRNA and protein levels after irradiation or TNF-α treatment alone and the combination of both. Signal transducer and activator of transcription-3 (STAT-3) seems to be involved in the signalling cascade. To study the involvement of PECAM-1 in hepatic damage more deeply, the liver of both wt- and PECAM-1-knock-out-mice were selectively irradiated (25 Gy). Thereby, ko-mice showed higher liver damage as revealed by elevated AST levels, but also increased hepatoprotective LCN-2 expression. Our studies show that TNF-α has a pivotal role in radiation-induced hepatic damage. It acts in concert with irradiation and its activity is modulated by PECAM-1, which mediates pro- and anti-inflammatory signalling."],["dc.identifier.doi","10.1111/jcmm.14224"],["dc.identifier.pmid","30761739"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15851"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/59695"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.issn","1582-4934"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject.ddc","610"],["dc.title","PECAM-1 modulates liver damage induced by synergistic effects of TNF-α and irradiation"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]