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Pharmacological elevation of sphingosine-1-phosphate by S1P lyase inhibition accelerates bone regeneration after post-traumatic osteomyelitis |
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| Authors: | Johannes M Wagner Annalena Wille Maria Fueth Sarah Weske Sebastian Lotzien Felix Reinkemeier Christoph Wallner Alexander Sogorski Stephanie Dittfeld Mustafa Becerikli Thomas A Schildhauer Marcus Lehnhardt Bodo Levkau Björn Behr |
| Institution: | 1. Department of Plastic Surgery, BG University Hospital Bergmannsheil Bochum, Bochum, Germany;2. Institute of Molecular Medicine III, University Hospital Düsseldorf and Heinrich Heine Universität Düsseldorf, Düsseldorf, Germany
Contribution: Data curation (equal), Formal analysis (equal), Methodology (equal), Writing - review & editing (equal);3. Department of Plastic Surgery, BG University Hospital Bergmannsheil Bochum, Bochum, Germany Contribution: Data curation (equal), Formal analysis (equal), Investigation (equal);4. Institute of Molecular Medicine III, University Hospital Düsseldorf and Heinrich Heine Universität Düsseldorf, Düsseldorf, Germany Contribution: Formal analysis (equal), Investigation (equal);5. Department of Trauma Surgery and General Surgery, BG University Hospital Bergmannsheil Bochum, Bochum, Germany Contribution: Conceptualization (equal), Data curation (equal), Resources (equal);6. Department of Plastic Surgery, BG University Hospital Bergmannsheil Bochum, Bochum, Germany Contribution: Conceptualization (equal), Project administration (equal), Software (equal), Supervision (equal);7. Department of Plastic Surgery, BG University Hospital Bergmannsheil Bochum, Bochum, Germany Contribution: Validation (equal), Visualization (equal), Writing - review & editing (equal);8. Department of Plastic Surgery, BG University Hospital Bergmannsheil Bochum, Bochum, Germany Contribution: Investigation (equal), Methodology (equal);9. Department of Plastic Surgery, BG University Hospital Bergmannsheil Bochum, Bochum, Germany Contribution: Data curation (equal), Formal analysis (equal), Resources (equal);10. Department of Plastic Surgery, BG University Hospital Bergmannsheil Bochum, Bochum, Germany Contribution: Project administration (equal), Supervision (equal);11. Department of Trauma Surgery and General Surgery, BG University Hospital Bergmannsheil Bochum, Bochum, Germany Contribution: Project administration (equal), Supervision (equal);12. Department of Plastic Surgery, BG University Hospital Bergmannsheil Bochum, Bochum, Germany Contribution: Conceptualization (equal), Funding acquisition (equal), Project administration (equal), Resources (equal);13. Institute of Molecular Medicine III, University Hospital Düsseldorf and Heinrich Heine Universität Düsseldorf, Düsseldorf, Germany Contribution: Project administration (equal), Supervision (equal), Validation (equal), Writing - original draft (equal), Writing - review & editing (equal) |
| Abstract: | Posttraumatic osteomyelitis and the ensuing bone defects are a debilitating complication after open fractures with little therapeutic options. We have recently identified potent osteoanabolic effects of sphingosine-1-phosphate (S1P) signalling and have now tested whether it may beneficially affect bone regeneration after infection. We employed pharmacological S1P lyase inhibition by 4-deoxypyrodoxin (DOP) to raise S1P levels in vivo in an unicortical long bone defect model of posttraumatic osteomyelitis in mice. In a translational approach, human bone specimens of clinical osteomyelitis patients were treated in organ culture in vitro with DOP. Bone regeneration was assessed by μCT, histomorphometry, immunohistology and gene expression analysis. The role of S1P receptors was addressed using S1PR3 deficient mice. Here, we present data that DOP treatment markedly enhanced osteogenesis in posttraumatic osteomyelitis. This was accompanied by greatly improved osteoblastogenesis and enhanced angiogenesis in the callus accompanied by osteoclast-mediated bone remodelling. We also identified the target of increased S1P to be the S1PR3 as S1PR3−/− mice showed no improvement of bone regeneration by DOP. In the human bone explants, bone mass significantly increased along with enhanced osteoblastogenesis and angiogenesis. Our data suggest that enhancement of S1P/S1PR3 signalling may be a promising therapeutic target for bone regeneration in posttraumatic osteomyelitis. |
| Keywords: | bone regeneration osteomyelitis sphingosin-1-phosphate |