Abstract
Background
Osteopenia and osteoporosis are considered to be extra-intestinal manifestations of inflammatory bowel disease (IBD). Anti-tumor necrosis factor (TNF)-α biologics have been introduced as novel medications for an active IBD. However, it is still not well documented whether anti-TNF-α affects the frequency of bone loss or abnormality of bone mineral markers among patients with IBD.
Aims
This study was to investigate the biochemical basis of low bone mineral density (BMD) and increased turnover in IBD during infliximab (IFX) therapy.
Methods
Forty patients with Crohn’s disease (CD), 80 patients with ulcerative colitis (UC), and 65 age- and gender-matched controls were included. BMD was measured with dual-energy X-ray absorptiometry, and vitamins K and D were measured as serum undercarboxylated osteocalcin (ucOC) and 1,25-(OH)2D, respectively. Bone formation and resorption were based on measuring bone-specific alkaline phosphatase (BAP) and serum N-terminal telopeptide of type I collagen (NTx), respectively.
Results
Significantly lower BMD was found in patients with UC and CD as compared to controls (P < 0.05). BAP, 1,25-(OH)2D, ucOC, and NTx were significantly higher in CD patients, but not in UC patients as compared to controls (P < 0.05). Further, serum NTx level was significantly higher in CD patients who were receiving IFX as compared to CD patients who were not receiving IFX (P < 0.01).
Conclusions
A lower BMD and higher bone metabolism markers were found in CD patients as compared to controls or UC patients. A significant increased serum level of NTx, a biochemical marker of increased bone resorption, was observed in CD patients during IFX therapy.
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Abbreviations
- BAP:
-
Bone-specific alkaline phosphatase
- BMD:
-
Bone mineral density
- CD:
-
Crohn’s disease
- DEXA:
-
Dual-energy X-ray absorptiometry
- IBD:
-
Inflammatory bowel diseases
- IFX:
-
Infliximab
- NTx:
-
N-terminal telopeptide of type I collagen
- SD:
-
Standard deviation
- TNF:
-
Tumour necrosis factor
- ucOC:
-
Undercarboxylated osteocalcin
- UC:
-
Ulcerative colitis
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Acknowledgments
No external funding was used to carry out this study.
Authors’ Contributions
K. Sugimoto, H. Hanai, K. Ikeya, T. Iida, F. Watanabe: study concept and design; K. Sugimoto, S. Kawasaki, O. Arai, K. Umehara, S. Tani, S. Oishi, S. Osawa, T. Yamamoto, H. Hanai: acquisition of data, statistical analyses, and interpretation of data; K. Sugimoto, H. Hanai: drafting of the manuscript; K. Sugimoto, K. Ikeya, T. Iida, S. Kawasaki, O. Arai, K. Umehara, F. Watanabe, S. Tani, S. Oishi, S. Osawa, T. Yamamoto, H. Hanai: critical revision of the manuscript for important intellectual content, and approval of the final manuscript version.
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The authors hereby declare having no conflict of interest or funding interest in connection with the publication of this manuscript.
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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.
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Sugimoto, K., Ikeya, K., Iida, T. et al. An Increased Serum N-Terminal Telopeptide of Type I Collagen, a Biochemical Marker of Increased Bone Resorption, Is Associated with Infliximab Therapy in Patients with Crohn’s Disease. Dig Dis Sci 61, 99–106 (2016). https://doi.org/10.1007/s10620-015-3838-y
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DOI: https://doi.org/10.1007/s10620-015-3838-y