Staphylococcus aureus internalization impairs osteoblastic activity and early differentiation process
Abstract Staphylococcus aureus is the most frequent aetiology of bone and joint infections (BJI) and can cause relapsing and chronic infections. One of the main factors involved in the chronicization of staphylococcal BJIs is the internalization of S. aureus into osteoblasts, the bone-forming cells....
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2021-09-01
|
| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-021-97246-y |
| _version_ | 1818851803147534336 |
|---|---|
| author | W. Mouton J. Josse C. Jacqueline L. Abad S. Trouillet-Assant J. Caillon D. Bouvard M. Bouchet F. Laurent A. Diot |
| author_facet | W. Mouton J. Josse C. Jacqueline L. Abad S. Trouillet-Assant J. Caillon D. Bouvard M. Bouchet F. Laurent A. Diot |
| author_sort | W. Mouton |
| collection | DOAJ |
| description | Abstract Staphylococcus aureus is the most frequent aetiology of bone and joint infections (BJI) and can cause relapsing and chronic infections. One of the main factors involved in the chronicization of staphylococcal BJIs is the internalization of S. aureus into osteoblasts, the bone-forming cells. Previous studies have shown that S. aureus triggers an impairment of osteoblasts function that could contribute to bone loss. However, these studies focused mainly on the extracellular effects of S. aureus. Our study aimed at understanding the intracellular effects of S. aureus on the early osteoblast differentiation process. In our in vitro model of osteoblast lineage infection, we first observed that internalized S. aureus 8325-4 (a reference lab strain) significantly impacted RUNX2 and COL1A1 expression compared to its non-internalized counterpart 8325-4∆fnbAB (with deletion of fnbA and fnbB). Then, in a murine model of osteomyelitis, we reported no significant effect for S. aureus 8325-4 and 8325-4∆fnbAB on bone parameters at 7 days post-infection whereas S. aureus 8325-4 significantly decreased trabecular bone thickness at 14 days post-infection compared to 8325-4∆fnbAB . When challenged with two clinical isogenic strains isolated from initial and relapse phase of the same BJI, significant impairments of bone parameters were observed for both initial and relapse strain, without differences between the two strains. Finally, in our in vitro osteoblast infection model, both clinical strains impacted alkaline phosphatase activity whereas the expression of bone differentiation genes was significantly decreased only after infection with the relapse strain. Globally, we highlighted that S. aureus internalization into osteoblasts is responsible for an impairment of the early differentiation in vitro and that S. aureus impaired bone parameters in vivo in a strain-dependent manner. |
| first_indexed | 2024-12-19T07:10:49Z |
| format | Article |
| id | doaj.art-50b5d0cbc9ed4069ac238978c2169b2e |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-19T07:10:49Z |
| publishDate | 2021-09-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-50b5d0cbc9ed4069ac238978c2169b2e2022-12-21T20:31:12ZengNature PortfolioScientific Reports2045-23222021-09-0111111010.1038/s41598-021-97246-yStaphylococcus aureus internalization impairs osteoblastic activity and early differentiation processW. Mouton0J. Josse1C. Jacqueline2L. Abad3S. Trouillet-Assant4J. Caillon5D. Bouvard6M. Bouchet7F. Laurent8A. Diot9CIRI - Centre International de Recherche en Infectiologie, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, École Normale Supérieure de Lyon, Université LyonCIRI - Centre International de Recherche en Infectiologie, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, École Normale Supérieure de Lyon, Université LyonFaculté de Médecine, EA3826 « Thérapeutiques Cliniques et Expérimentales des Infections », Université de NantesCIRI - Centre International de Recherche en Infectiologie, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, École Normale Supérieure de Lyon, Université LyonCIRI - Centre International de Recherche en Infectiologie, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, École Normale Supérieure de Lyon, Université LyonFaculté de Médecine, EA3826 « Thérapeutiques Cliniques et Expérimentales des Infections », Université de NantesCRBM, University of Montpellier, CNRS-5237Institut De Génomique Fonctionnelle De Lyon, ENS de Lyon, UMR CNRS 5242CIRI - Centre International de Recherche en Infectiologie, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, École Normale Supérieure de Lyon, Université LyonCIRI - Centre International de Recherche en Infectiologie, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, École Normale Supérieure de Lyon, Université LyonAbstract Staphylococcus aureus is the most frequent aetiology of bone and joint infections (BJI) and can cause relapsing and chronic infections. One of the main factors involved in the chronicization of staphylococcal BJIs is the internalization of S. aureus into osteoblasts, the bone-forming cells. Previous studies have shown that S. aureus triggers an impairment of osteoblasts function that could contribute to bone loss. However, these studies focused mainly on the extracellular effects of S. aureus. Our study aimed at understanding the intracellular effects of S. aureus on the early osteoblast differentiation process. In our in vitro model of osteoblast lineage infection, we first observed that internalized S. aureus 8325-4 (a reference lab strain) significantly impacted RUNX2 and COL1A1 expression compared to its non-internalized counterpart 8325-4∆fnbAB (with deletion of fnbA and fnbB). Then, in a murine model of osteomyelitis, we reported no significant effect for S. aureus 8325-4 and 8325-4∆fnbAB on bone parameters at 7 days post-infection whereas S. aureus 8325-4 significantly decreased trabecular bone thickness at 14 days post-infection compared to 8325-4∆fnbAB . When challenged with two clinical isogenic strains isolated from initial and relapse phase of the same BJI, significant impairments of bone parameters were observed for both initial and relapse strain, without differences between the two strains. Finally, in our in vitro osteoblast infection model, both clinical strains impacted alkaline phosphatase activity whereas the expression of bone differentiation genes was significantly decreased only after infection with the relapse strain. Globally, we highlighted that S. aureus internalization into osteoblasts is responsible for an impairment of the early differentiation in vitro and that S. aureus impaired bone parameters in vivo in a strain-dependent manner.https://doi.org/10.1038/s41598-021-97246-y |
| spellingShingle | W. Mouton J. Josse C. Jacqueline L. Abad S. Trouillet-Assant J. Caillon D. Bouvard M. Bouchet F. Laurent A. Diot Staphylococcus aureus internalization impairs osteoblastic activity and early differentiation process Scientific Reports |
| title | Staphylococcus aureus internalization impairs osteoblastic activity and early differentiation process |
| title_full | Staphylococcus aureus internalization impairs osteoblastic activity and early differentiation process |
| title_fullStr | Staphylococcus aureus internalization impairs osteoblastic activity and early differentiation process |
| title_full_unstemmed | Staphylococcus aureus internalization impairs osteoblastic activity and early differentiation process |
| title_short | Staphylococcus aureus internalization impairs osteoblastic activity and early differentiation process |
| title_sort | staphylococcus aureus internalization impairs osteoblastic activity and early differentiation process |
| url | https://doi.org/10.1038/s41598-021-97246-y |
| work_keys_str_mv | AT wmouton staphylococcusaureusinternalizationimpairsosteoblasticactivityandearlydifferentiationprocess AT jjosse staphylococcusaureusinternalizationimpairsosteoblasticactivityandearlydifferentiationprocess AT cjacqueline staphylococcusaureusinternalizationimpairsosteoblasticactivityandearlydifferentiationprocess AT labad staphylococcusaureusinternalizationimpairsosteoblasticactivityandearlydifferentiationprocess AT strouilletassant staphylococcusaureusinternalizationimpairsosteoblasticactivityandearlydifferentiationprocess AT jcaillon staphylococcusaureusinternalizationimpairsosteoblasticactivityandearlydifferentiationprocess AT dbouvard staphylococcusaureusinternalizationimpairsosteoblasticactivityandearlydifferentiationprocess AT mbouchet staphylococcusaureusinternalizationimpairsosteoblasticactivityandearlydifferentiationprocess AT flaurent staphylococcusaureusinternalizationimpairsosteoblasticactivityandearlydifferentiationprocess AT adiot staphylococcusaureusinternalizationimpairsosteoblasticactivityandearlydifferentiationprocess |