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In psoriatic arthritis Dkk-1 and PTH are lower than in rheumatoid arthritis and healthy controls

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Abstract

Psoriatic Arthritis (PsA) is characterized by bone erosive damage often associated with exuberant bone formation especially in enthesial sites. Dkk-1 and sclerostin are the main inhibitors of the WNT/β-catenin signaling pathway and play a key role in the regulation of both bone formation and resorption. We performed this study in order to compare the serum levels of the WNT-pathway regulators along with bone turnover markers (BTM) and parathyroid hormone (PTH) between three different groups: one group of female patients affected by PsA, one group of female patients affected by rheumatoid arthritis (RA), and healthy female controls (HC). This is a cross-sectional study including 33 patients with PsA classified with the CASPAR criteria, 35 HC, and 28 patients with RA classified with the ACR/EULAR 2010 criteria. Intact N-propeptide of type I collagen (PINP), C-terminal telopeptide of type I collagen (CTX-I), Dickkopf-related-protein 1 (Dkk-1), sclerostin, PTH, and 25OH-vitamin D serum levels were dosed. The PsA group showed significantly lower Dkk-1 levels when compared to the HC and RA groups. Dkk-1 in the RA group was significantly higher than HC. A similar trend was documented for PTH. In the PsA group, CTX-I was found to be lower than in both the RA and HC groups. This study demonstrated for the first time that Dkk-1 levels in PsA are lower than HC, in contrast with RA, in which they are increased. These results might contribute to explain the different bone involvement of the two different diseases.

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Acknowledgements

The authors would like to thank Dr. Caterina Fraccarollo for the ELISA assays, Dr. Fabio Poli for the technical assistance, and the LURM (Laboratorio Universitario di Ricerca Medica) Research Center, University of Verona, where the biochemical analyses were performed.

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Authors and Affiliations

  1. Unit of Rheumatology, University of Verona, Ospedale Civile Maggiore, Piazzale A. Scuro, 37134, Verona, Italy

    Angelo Fassio, Luca Idolazzi, Ombretta Viapiana, Camilla Benini, Elisabetta Vantaggiato, Maurizio Rossini & Davide Gatti

  2. Department of Internal Medicine, University of Verona, Piazzale A. Scuro, 37134, Verona, Italy

    Francesco Bertoldo

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  1. Angelo Fassio
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  2. Luca Idolazzi
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Correspondence to Angelo Fassio.

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Ethical approval: all procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent: informed consent was obtained from all individual participants included in the study.

Disclosure statement

Angelo Fassio, Luca Idolazzi, Ombretta Viapiana, Camilla Benini, Elisabetta Vantaggiato, Francesco Bertoldo, Maurizio Rossini and Davide Gatti have no conflict of interest to declare.

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Fassio, A., Idolazzi, L., Viapiana, O. et al. In psoriatic arthritis Dkk-1 and PTH are lower than in rheumatoid arthritis and healthy controls. Clin Rheumatol 36, 2377–2381 (2017). https://doi.org/10.1007/s10067-017-3734-2

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  • DOI: https://doi.org/10.1007/s10067-017-3734-2

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