Interleukin-6 and chondrocyte mineralisation act in tandem to promote experimental osteoarthritis.

Détails

ID Serval
serval:BIB_C39D217C816F
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Interleukin-6 and chondrocyte mineralisation act in tandem to promote experimental osteoarthritis.
Périodique
Annals of the rheumatic diseases
Auteur(s)
Nasi S., So A., Combes C., Daudon M., Busso N.
ISSN
1468-2060 (Electronic)
ISSN-L
0003-4967
Statut éditorial
Publié
Date de publication
07/2016
Peer-reviewed
Oui
Volume
75
Numéro
7
Pages
1372-1379
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
Basic calcium phosphate (BCP) crystal and interleukin 6 (IL-6) have been implicated in osteoarthritis (OA). We hypothesise that these two factors may be linked in a reciprocal amplification loop which leads to OA.
Primary murine chondrocytes and human cartilage explants were incubated with hydroxyapatite (HA) crystals, a form of BCP, and the modulation of cytokines and matrix-degrading enzymes assayed. The ability of IL-6 to stimulate chondrocyte calcification was assessed in vitro. The mechanisms underlying the effects of HA on chondrocytes were investigated using chemical inhibitors, and the pathways mediating IL-6-induced calcification characterised by quantifying the expression of genes involved in chondrocyte mineralisation. The role of calcification in vivo was studied in the meniscectomy model of murine OA (MNX), and the link between IL-6 and cartilage degradation investigated by histology.
In chondrocytes, BCP crystals stimulated IL-6 secretion, further amplified in an autocrine loop, through signalling pathways involving Syk and PI3 kinases, Jak2 and Stat3 molecules. Exogenous IL-6 promoted calcium-containing crystal formation and upregulation of genes involved in calcification: the pyrophosphate channel Ank, the calcium channel Annexin5 and the sodium/phosphate cotransporter Pit-1. Treatment of chondrocytes with IL-6 inhibitors significantly inhibited IL-6-induced crystal formation. In meniscectomised mice, increasing deposits of BCP crystals were observed around the joint and correlated with cartilage degradation and IL-6 expression. Finally, BCP crystals induced proteoglycan loss and IL-6 expression in human cartilage explants, which were reduced by an IL-6 inhibitor.
BCP crystals and IL-6 form a positive feedback loop leading to OA. Targeting calcium-containing crystal formation and/or IL-6 are promising therapeutic strategies in OA.

Mots-clé
Animals, Arthritis, Experimental/metabolism, Arthritis, Experimental/pathology, Calcification, Physiologic, Calcium Channels/metabolism, Calcium Phosphates/metabolism, Chondrocytes/pathology, Disease Models, Animal, Humans, Interleukin-6/metabolism, Mice, Osteoarthritis/metabolism, Osteoarthritis/pathology
Pubmed
Création de la notice
28/12/2015 13:04
Dernière modification de la notice
03/03/2018 21:12
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