The alarmins S100A8 and S100A9 mediate acute pain in experimental synovitis
Abstract Background Synovitis-associated pain is mediated by inflammatory factors that may include S100A8/9, which is able to stimulate nociceptive neurons via Toll-like receptor 4. In this study, we investigated the role of S100A9 in pain response during acute synovitis. Methods Acute synovitis was...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2020-08-01
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| Series: | Arthritis Research & Therapy |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s13075-020-02295-9 |
| _version_ | 1818177061461688320 |
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| author | Arjen B. Blom Martijn H. van den Bosch Esmeralda N. Blaney Davidson Johannes Roth Thomas Vogl Fons A. van de Loo Marije Koenders Peter M. van der Kraan Edwin J. Geven Peter L. van Lent |
| author_facet | Arjen B. Blom Martijn H. van den Bosch Esmeralda N. Blaney Davidson Johannes Roth Thomas Vogl Fons A. van de Loo Marije Koenders Peter M. van der Kraan Edwin J. Geven Peter L. van Lent |
| author_sort | Arjen B. Blom |
| collection | DOAJ |
| description | Abstract Background Synovitis-associated pain is mediated by inflammatory factors that may include S100A8/9, which is able to stimulate nociceptive neurons via Toll-like receptor 4. In this study, we investigated the role of S100A9 in pain response during acute synovitis. Methods Acute synovitis was induced by streptococcal cell wall (SCW) injection in the knee joint of C57Bl/6 (WT) and S100A9 −/− mice. The expression of S100A8/A9 was determined in serum and synovium by ELISA and immunohistochemistry. Inflammation was investigated by 99mTc accumulation, synovial cytokine release, and histology at days 1, 2, and 7. To assess pain, weight distribution, gait analysis, and mechanical allodynia were monitored. Activation markers in afferent neurons were determined by qPCR and immunohistochemistry in the dorsal root ganglia (DRG). Differences between groups were tested using a one-way or two-way analysis of variance (ANOVA). Differences in histology were tested with a non-parametric Mann–Whitney U test. p values lower than 0.05 were considered significant. Results Intra-articular SCW injection resulted in increased synovial expression and serum levels of S100A8/A9 at day 1. These increased levels, however, did not contribute to the development of inflammation, since this was equal in S100A9 −/− mice. WT mice showed a significantly decreased percentage of weight bearing on the SCW hind paw on day 1, while S100A9 −/− mice showed no reduction. Gait analysis showed increased “limping” behavior in WT, but not S100A9 −/− mice. Mechanical allodynia was observed but not different between WT and S100A9 −/− when measuring paw withdrawal threshold. The gene expression of neuron activation markers NAV1.7, ATF3, and GAP43 in DRG was significantly increased in arthritic WT mice at day 1 but not in S100A9 −/− mice. Conclusions S100A8/9, released from the synovium upon inflammation, is an important mediator of pain response in the knee during the acute phase of inflammation. |
| first_indexed | 2024-12-11T20:26:06Z |
| format | Article |
| id | doaj.art-0d3325c14e2f4f258d2c206fd533edb7 |
| institution | Directory Open Access Journal |
| issn | 1478-6362 |
| language | English |
| last_indexed | 2024-12-11T20:26:06Z |
| publishDate | 2020-08-01 |
| publisher | BMC |
| record_format | Article |
| series | Arthritis Research & Therapy |
| spelling | doaj.art-0d3325c14e2f4f258d2c206fd533edb72022-12-22T00:51:56ZengBMCArthritis Research & Therapy1478-63622020-08-0122111510.1186/s13075-020-02295-9The alarmins S100A8 and S100A9 mediate acute pain in experimental synovitisArjen B. Blom0Martijn H. van den Bosch1Esmeralda N. Blaney Davidson2Johannes Roth3Thomas Vogl4Fons A. van de Loo5Marije Koenders6Peter M. van der Kraan7Edwin J. Geven8Peter L. van Lent9Experimental Rheumatology, Radboud university medical centerExperimental Rheumatology, Radboud university medical centerExperimental Rheumatology, Radboud university medical centerInstitute of Immunology, University of MünsterInstitute of Immunology, University of MünsterExperimental Rheumatology, Radboud university medical centerExperimental Rheumatology, Radboud university medical centerExperimental Rheumatology, Radboud university medical centerExperimental Rheumatology, Radboud university medical centerExperimental Rheumatology, Radboud university medical centerAbstract Background Synovitis-associated pain is mediated by inflammatory factors that may include S100A8/9, which is able to stimulate nociceptive neurons via Toll-like receptor 4. In this study, we investigated the role of S100A9 in pain response during acute synovitis. Methods Acute synovitis was induced by streptococcal cell wall (SCW) injection in the knee joint of C57Bl/6 (WT) and S100A9 −/− mice. The expression of S100A8/A9 was determined in serum and synovium by ELISA and immunohistochemistry. Inflammation was investigated by 99mTc accumulation, synovial cytokine release, and histology at days 1, 2, and 7. To assess pain, weight distribution, gait analysis, and mechanical allodynia were monitored. Activation markers in afferent neurons were determined by qPCR and immunohistochemistry in the dorsal root ganglia (DRG). Differences between groups were tested using a one-way or two-way analysis of variance (ANOVA). Differences in histology were tested with a non-parametric Mann–Whitney U test. p values lower than 0.05 were considered significant. Results Intra-articular SCW injection resulted in increased synovial expression and serum levels of S100A8/A9 at day 1. These increased levels, however, did not contribute to the development of inflammation, since this was equal in S100A9 −/− mice. WT mice showed a significantly decreased percentage of weight bearing on the SCW hind paw on day 1, while S100A9 −/− mice showed no reduction. Gait analysis showed increased “limping” behavior in WT, but not S100A9 −/− mice. Mechanical allodynia was observed but not different between WT and S100A9 −/− when measuring paw withdrawal threshold. The gene expression of neuron activation markers NAV1.7, ATF3, and GAP43 in DRG was significantly increased in arthritic WT mice at day 1 but not in S100A9 −/− mice. Conclusions S100A8/9, released from the synovium upon inflammation, is an important mediator of pain response in the knee during the acute phase of inflammation.http://link.springer.com/article/10.1186/s13075-020-02295-9SynovitisPainNociceptionAlarminsS100A8S100A9 |
| spellingShingle | Arjen B. Blom Martijn H. van den Bosch Esmeralda N. Blaney Davidson Johannes Roth Thomas Vogl Fons A. van de Loo Marije Koenders Peter M. van der Kraan Edwin J. Geven Peter L. van Lent The alarmins S100A8 and S100A9 mediate acute pain in experimental synovitis Arthritis Research & Therapy Synovitis Pain Nociception Alarmins S100A8 S100A9 |
| title | The alarmins S100A8 and S100A9 mediate acute pain in experimental synovitis |
| title_full | The alarmins S100A8 and S100A9 mediate acute pain in experimental synovitis |
| title_fullStr | The alarmins S100A8 and S100A9 mediate acute pain in experimental synovitis |
| title_full_unstemmed | The alarmins S100A8 and S100A9 mediate acute pain in experimental synovitis |
| title_short | The alarmins S100A8 and S100A9 mediate acute pain in experimental synovitis |
| title_sort | alarmins s100a8 and s100a9 mediate acute pain in experimental synovitis |
| topic | Synovitis Pain Nociception Alarmins S100A8 S100A9 |
| url | http://link.springer.com/article/10.1186/s13075-020-02295-9 |
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