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Activation of NF-kappa B in Synovium versus Cartilage from Patients with Advanced Knee Osteoarthritis: A Potential Contributor to Inflammatory Aspects of Disease Progression
Karolinska Inst, Dept Clin Neurosci, Nobel Vag 9, S-17177 Stockholm, Sweden.
Lowenstromska Hosp, Ortho Ctr Stockholm, S-19489 Upplands Vasby, Sweden.
Lowenstromska Hosp, Ortho Ctr Stockholm, S-19489 Upplands Vasby, Sweden.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmaceutical Biosciences.ORCID iD: 0000-0002-8074-9833
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2018 (English)In: Journal of Immunology, ISSN 0022-1767, E-ISSN 1550-6606, Vol. 201, no 7, p. 1918-1927Article in journal (Refereed) Published
Abstract [en]

The aim was to assess the activation and association of the NF-kappa B system across synovial membrane (SM) and articular cartilage (AC) in patients with knee osteoarthritis (OA) and ascertain its potential effects on catabolic mediator expression in advanced OA. SM and AC were obtained from 40 OA patients undergoing total knee arthroplasty and from 19 postmortem control subjects. NF-kappa B subunit RelA in nuclear and cytosolic fractions and NF-kappa B1-DNA binding in nuclear extracts was assessed by ELISA, whereas NFKB1, RELA, IL-8, IL-6, and MMP3 gene expression were analyzed by reverse transcriptase-quantitative PCR in tissues. We observed higher SM nuclear RelA protein levels and upregulated NF-kappa B1-DNA binding in OA patients compared with postmortem controls. However, in AC, lower nuclear RelA levels were observed compared with cytosolic extracts in patients. Nuclear RelA levels correlated positively with NF-kappa B1-DNA binding in SM and AC in patients. SM RELA and MMP3 mRNA levels were upregulated, whereas IL-8 and IL-6 as well as AC RELA were downregulated in patients compared with controls. In SM, nuclear RelA levels correlated positively with MMP3 gene expression in patients. A negative correlation was observed between SM nuclear RelA levels and AC NF-kappa B1-DNA binding, and SM nuclear NF-kappa B1-DNA binding correlated negatively with AC MMP3 and NFKB1 mRNA levels in patients. These findings highlight NF-kappa B-triggered cross-talk and feedback mechanisms between SM and AC in OA. Further, our findings strongly support a role for an activated NF-kappa B system in the transcriptional mechanism of inflammatory processes, especially in SM of patients with advanced OA.

Place, publisher, year, edition, pages
AMER ASSOC IMMUNOLOGISTS , 2018. Vol. 201, no 7, p. 1918-1927
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Immunology in the medical area
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URN: urn:nbn:se:uu:diva-366723DOI: 10.4049/jimmunol.1800486ISI: 000444804300013PubMedID: 30135182OAI: oai:DiVA.org:uu-366723DiVA, id: diva2:1270404
Funder
Swedish Research Council, K2013-52X-22199-01-3Swedish Research Council, 542-2013-8373Swedish Rheumatism AssociationAvailable from: 2018-12-13 Created: 2018-12-13 Last updated: 2018-12-13Bibliographically approved

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