Joint Damage Accelerating Properties of Neutrophils


Neutrophils are innate immune cells involved in the initial inflammatory response and in the pathogenesis of rheumatoid arthritis (RA), an inflammatory joint disease. They produce cytokines, chemokines, proinflammatory mediators and secrete enzymes causing a direct destruction of cartilage and bone. Herein we investigated the ability of neutrophils to express the receptor activator of nuclear factor kappa-B ligand (RANKL) and to interfere with maturation of late pre-osteoclasts. The distribution of bone marrow (BM) Ly6G+ cells expressing RANKL was evaluated after BM cell dye labelling and transfer into zymosan-injected SCID recipient mice. Specific tartrate-resistant acid phosphatase (TRAP) staining was used to determine the number of multinucleated mature osteoclasts in the co-cultures of purified blood neutrophils with preosteoclasts. Ly6 G+ BM cells migrated extensively in synovial fluid and spleen of recipient zymosan-injected SCID mice. Labelled neutrophils have higher RANKL expression in synovial fluid unlike in spleen indicating that they obtained specific phenotype during their migration to the synovial fluid. Blood neutrophils increased the number of multinucleated mature osteoclasts in vitro. This effect was elicited by the pretreatment of neutrophils with interleukin (IL)-17. In summary, our study showed neutrophils’s properties to accelerate joint damage via RANKL and interactions with osteoclasts.

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Milanova, V. , Ivanovska, N. and Dimitrova, P. (2014) Joint Damage Accelerating Properties of Neutrophils. Open Journal of Rheumatology and Autoimmune Diseases, 4, 106-113. doi: 10.4236/ojra.2014.42016.

Conflicts of Interest

The authors declare no conflicts of interest.


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