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Salivary proteomics in bisphosphonate‐related osteonecrosis of the jaw
Author(s) -
ThumbigereMath V,
Michalowicz BS,
Jong EP,
Griffin TJ,
Basi DL,
Hughes PJ,
Tsai ML,
Swenson KK,
Rockwell L,
Gopalakrishnan R
Publication year - 2015
Publication title -
oral diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.953
H-Index - 87
eISSN - 1601-0825
pISSN - 1354-523X
DOI - 10.1111/odi.12204
Subject(s) - saliva , medicine , osteonecrosis of the jaw , bisphosphonate , desmoplakin , biomarker , proteomics , pathology , biology , osteoporosis , biochemistry , gene , cell
Objective The objective of this study was to identify differentially expressed salivary proteins in bisphosphonate‐related osteonecrosis of the jaw ( BRONJ ) patients that could serve as biomarkers for BRONJ diagnosis. Subjects and Methods Whole saliva obtained from 20 BRONJ patients and 20 controls were pooled within groups. The samples were analyzed using i TRAQ ‐labeled two‐dimensional liquid chromatography–tandem mass spectrometry. Results Overall, 1340 proteins were identified. Of these, biomarker candidates were selected based on P ‐value (<0.001), changes in protein expression (≥1.5‐fold increase or decrease), and unique peptides identified (≥2). Three comparisons made between BRONJ and control patients identified 200 proteins to be differentially expressed in BRONJ patients. A majority of these proteins were predicted to have a role in drug metabolism and immunological and dermatological diseases. Of all the differentially expressed proteins, we selected metalloproteinase‐9 and desmoplakin for further validation. Immunoassays confirmed increased expression of metalloproteinase‐9 in individual saliva ( P = 0.048) and serum samples ( P = 0.05) of BRONJ patients. Desmoplakin was undetectable in saliva. However, desmoplakin levels tended to be lower in BRONJ serum than controls ( P = 0.157). Conclusions Multiple pathological reactions are involved in BRONJ development. One or more proteins identified by this study may prove to be useful biomarkers for BRONJ diagnosis. The role of metalloproteinase‐9 and desmoplakin in BRONJ requires further investigation.