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Irish Journal of Medical Science

, Volume 183, Issue 1, pp 47–52 | Cite as

Limited utility of tartrate-resistant acid phosphatase isoform 5b in assessing response to therapy in osteoporosis

  • J. J. Brady
  • R. K. Crowley
  • B. F. Murray
  • M. T. Kilbane
  • M. O’Keane
  • M. J. McKenna
Original Article

Abstract

Background

Tartrate-resistant acid phosphatase isoform 5b (TRACP5b) is a serum bone resorption marker. Our aim was to investigate its utility in monitoring metabolic bone disease.

Methods

Serum TRACP5b, C-terminal cross-linking telopeptide of type I collagen, urine N-terminal cross-linking telopeptide of type I collagen and free deoxypyridinoline were measured pre- and post-treatment with a parathyroid hormone analogue [PTH (1–34)] (n = 14) or a bisphosphonate (N-BP) (n = 8). TRACP5b, bone alkaline phosphatase (bone ALP), 25-hydroxyvitamin D (25OHD) and parathyroid hormone (PTH) were measured in 100 osteoporosis patients on prolonged bisphosphonate therapy.

Results

Changes in TRACP5b were smaller in magnitude but mimicked those of other bone resorption markers. Absolute changes in TRACP5b and the other resorption markers correlated significantly (p < 0.001). In patients on long-term bisphosphonates, TRACP5b and bone ALP levels were not suppressed. Vitamin D status was consistent with the level of supplementation.

Conclusion

TRACP5b has limited utility as a single marker of metabolic bone disease treatment.

Keywords

TRACP5b Bisphosphonate Bone turnover markers PTH Vitamin D 

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Copyright information

© Royal Academy of Medicine in Ireland 2013

Authors and Affiliations

  • J. J. Brady
    • 1
  • R. K. Crowley
    • 2
  • B. F. Murray
    • 1
  • M. T. Kilbane
    • 1
  • M. O’Keane
    • 1
  • M. J. McKenna
    • 1
    • 2
    • 3
  1. 1.Metabolism LaboratorySt. Vincent’s University HospitalDublinIreland
  2. 2.St. Michael’s Hospital, Dún LaoghaireDublinIreland
  3. 3.School of Medicine and Medical SciencesUniversity College DublinDublinIreland

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