Abstract
Beta-arrestin-1 (β-arrestin-1) is an adaptor protein that functions in the termination of G-protein activation and seems to be involved in the mediation of the inflammatory response. Interleukin-1β (IL-1β) elicits the expression of inflammatory mediators through a mechanism involving hyaluronan (HA) degradation, thereby contributing to toll-like receptor 4 (TLR-4) and CD44 activation. Stimulation of both receptors induces nuclear factor kappaB (NF-kB) activation that, through transforming-growth-factor-activated-kinase-1 (TAK-1), in turn stimulates the inflammatory mediators of transcription. As β-arrestin-1 seems to play an inflammatory role in arthritis, we have investigated the involvement of β-arrestin-1 in a model of IL-1β-induced inflammatory response in mouse chondrocytes. IL-1β treatment significantly increases chondrocytes TLR-4, CD44, β-arrestin-1, TAK-1, and serine/threonine kinase (AKT) mRNA expression and related protein levels. NF-kB is also markedly activated with consequent tumor-necrosis-factor-alpha, interleukin-6, and inducible-nitric-oxide-synthase up-regulation. Treatment of IL-1β-stimulated chondrocytes with β-arrestin-1 and/or AKT and/or TAK-1-specific inhibitors significantly reduces all parameters, although the inhibitory effect exerted by TAK-1-mediated pathways is more effective than that of β-arrestin-1. β-Arrestin-1-induced NF-kB activation is mediated by the AKT pathway as shown by IL-1β-stimulated chondrocytes treated with AKT inhibitor. Finally, a specific HA-blocking peptide (Pep-1) has confirmed the inflammatory role of degraded HA as a mediator of the IL-1β-induced activation of β-arrestin-1.
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This study was supported by a COFIN 2009 grant from the MIUR, Italy (grant no. 20094C2H2M_003).
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Campo, G.M., Avenoso, A., D’Ascola, A. et al. Beta-arrestin 1 is involved in the catabolic response stimulated by hyaluronan degradation in mouse chondrocytes. Cell Tissue Res 361, 567–579 (2015). https://doi.org/10.1007/s00441-015-2112-0
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DOI: https://doi.org/10.1007/s00441-015-2112-0