Quantitation and distribution of metallic elements in sequestra of medication-related osteonecrosis of jaw (MRONJ) using inductively coupled plasma atomic emission spectroscopy and synchrotron radiation X-ray fluorescence analysis
Medication-related osteonecrosis of the jaw (MRONJ) is a serious adverse effect of antiresorptive agents like bisphosphonates. Abnormal concentrations of various trace metallic elements contained in bone minerals have been associated with MRONJ. In this study, we focused on trace metallic elements contained in the MRONJ sequestrum; their content and distribution were compared to those in osteomyelitis and non-inflammatory bones using inductively coupled plasma atomic emission spectroscopy (ICP-AES) and synchrotron radiation X-ray fluorescence analysis (SR-XRF). On ICP-AES analyses, various trace elements (Co, Cr, Cu, Fe, K, Mg, Ni, Sb, Ti, V, Pb) were significantly more in MRONJ sequestra than non-inflammatory bones. The Cu content was significantly higher in MRONJ sequestra than osteomyelitis and non-inflammatory bones. The Cu content in MRONJ sequestra was high even after decalcification. Additionally, Cu was distributed along the trabecular structures in decalcified MRONJ specimens, as observed using SR-XRF analysis. Therefore, this study was indicative of the characteristic behavior of Cu in MRONJ.
KeywordsMedication-related osteonecrosis of the jaw (MRONJ) Trace metallic element Inductively coupled plasma atomic emission spectroscopy (ICP-AES) Synchrotron radiation X-ray fluorescence analysis (SR-XRF)
The authors would like to thank Ms. Miwako Hamagaki for the preparation of the specimens for elemental analyses. SR-XRF measurements were performed with the approval of the Photon Factory Program Advisory Committee (Proposal no. 2016G018). This work was supported by a Grant-in Aid from the Japan Society for the Promotion of Science (JSPS no. 16H02688).
Compliance with ethical standards
Conflict of interest
The authors declare no conflict of interest.
All patients provided informed consent and the study protocol was approved by the Ethical Committee of Tokyo Medical and Dental University (D2016-002)
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