Rheumatology International

, Volume 32, Issue 9, pp 2669–2674

Osteoprotegerin expression in bone marrow by treatment with tocilizumab in rheumatoid arthritis

  • Katsuaki Kanbe
  • Atsushi Nakamura
  • Yasuo Inoue
  • Kaori Hobo
Original Article

Abstract

The aim of this study was to investigate histological changes of bone marrow in response to tocilizumab for rheumatoid arthritis (RA). After tocilizumab therapy, bone marrow tissues were extracted from ten RA patients at the time of total knee arthroplasty (TKA). Control samples were obtained from ten RA patients who underwent MTX mono-therapy. Histological examination of structural differences between the tocilizumab and control groups in bone marrow was performed using hematoxylin and eosin (H&E) to evaluate differences. In immunohistochemical examination, the expression of seven molecules including tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), CD68, osteoprotegerin (OPG), receptor activator of nuclear kappa B ligand (RANKL), CD4 and osteopontin (OPN) were compared between two groups. NTx was significantly low at 44.5 ± 2 nM BCE/mM Cr compared with control at 73.2 ± 8 nM BCE/mM Cr. Immunohistochemical examination revealed that the bone marrow tissues of the RA patients who underwent tocilizumab therapy demonstrated significant positive OPG as compared with the control. However, immunohistochemical examinations after tocilizumab revealed that TNF-α, IL-6, CD68, CD4, OPN and RANKL were not significantly different with control of MTX in bone marrow. Therefore, treatment with tocilizumab increased the expression of OPG as the histological changes with respect to inhibit RANKL-related bone resorption of bone marrow in RA.

Keywords

Tocilizumab Bone Histology Rheumatoid Arthritis 

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Katsuaki Kanbe
    • 1
  • Atsushi Nakamura
    • 1
  • Yasuo Inoue
    • 1
  • Kaori Hobo
    • 1
  1. 1.Department of Orthopaedic SurgeryTokyo Women’s Medical UniversityTokyoJapan

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