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Clinical Rheumatology

, Volume 37, Issue 11, pp 3057–3062 | Cite as

Dickkopf-1 (Dkk-1) serum levels in systemic sclerosis and rheumatoid arthritis patients: correlation with the Trabecular Bone Score (TBS)

  • Barbara Ruaro
  • Andrea Casabella
  • Sabrina Paolino
  • Carmen Pizzorni
  • Massimo Ghio
  • Chiara Seriolo
  • Luigi Molfetta
  • Patrizio Odetti
  • Vanessa Smith
  • Maurizio Cutolo
Original Article

Abstract

The aim of this research was to determine any correlations between Dickkopf-1 serum levels (Dkk-1, a natural inhibitor of the Wnt signaling pathway promoting osteoclastogenesis) and the Trabecular Bone Score (TBS), in systemic sclerosis (SSc) and rheumatoid arthritis (RA) patients. It also aimed at determining any difference in Dkk-1 serum levels between SSc and RA patients and a control group (CNT) of healthy subjects. A prospective study was carried out in 60 SSc and 60 RA patients and 60 CNT. Dkk-1 serum levels were evaluated by the ELISA method (Quantikine Human Dkk-1 Immunoassay, R&D System, Minneapolis, USA). The severity of microvascular damage was evaluated by nailfold videocapillaroscopy (NVC patterns: “Early,” “Active,” “Late”), in the SSc patients. TBS analysis and bone mineral density (BMD, g/cm2) were measured in all patients/subjects. The SSc patients showed higher Dkk-1 serum levels than RA (p < 0.004) and CNT (p < 0.0001) patients. SSc patients, showing the “Late” NVC pattern had statistically higher Dkk-1 serum levels than patients with either the “Active” or “Early” (p < 0.004) patterns. Only in the “Late” NVC pattern group of SSc patients was there a significant negative correlation between Dkk-1 and TBS values (p < 0.0001). The increased Dkk-1 serum levels and decreased TBS values observed suggest a diffuse bone damage in SSc patients with advanced disease, as demonstrated by the concomitant presence of the “Late” NVC pattern. Moreover, the bone remodeling in SSc seems even higher than that in RA patients.

Keywords

Dickkopf-1 Osteoporosis Rheumatoid arthritis Systemic sclerosis Trabecular Bone Score 

Notes

Acknowledgments

The authors would like to thank Barbara Wade, contract Professor at the University of Torino, for her linguistic advice.

Funding statement

No specific funding was received from any bodies in the public, commercial, or not-for-profit sectors to carry out the work described in this manuscript. Barbara Ruaro is supported by a Grant from the Italian Society of Rheumatology. Vanessa Smith is a Senior Clinical Investigator of the Research Foundation - Flanders (Belgium) (FWO) [1802915N].

Compliance with ethical standards

Disclosures

None.

Ethical standards

This prospective study was carried out in accordance with the ethical standards stipulated in the 1964 Declaration of Helsinki and its later amendments and was evaluated by the local IRB.

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Copyright information

© International League of Associations for Rheumatology (ILAR) 2018

Authors and Affiliations

  • Barbara Ruaro
    • 1
  • Andrea Casabella
    • 1
    • 2
  • Sabrina Paolino
    • 1
  • Carmen Pizzorni
    • 1
  • Massimo Ghio
    • 1
  • Chiara Seriolo
    • 2
  • Luigi Molfetta
    • 2
  • Patrizio Odetti
    • 2
  • Vanessa Smith
    • 3
    • 4
  • Maurizio Cutolo
    • 1
  1. 1.Research Laboratory and Academic Division of Clinical Rheumatology, Department of Internal Medicine (Di.M.I.), Polyclinic San Martino HospitalUniversity of GenovaGenoaItaly
  2. 2.Centro di Ricerca su Osteoporosi e Patologie Osteoarticolari CROPO, Di.M.I.University of GenovaGenoaItaly
  3. 3.Department of RheumatologyGhent University HospitalGhentBelgium
  4. 4.Department of Internal MedicineGhent UniversityGhentBelgium

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