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Clinical Oral Investigations

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01-07-2015 | Original Article

BRONJ-related jaw bone is associated with increased Dlx-5 and suppressed osteopontin—implication in the site-specific alteration of angiogenesis and bone turnover by bisphosphonates

Authors: Falk Wehrhan, Kerstin Amann, Patrick Möbius, Manuel Weber, Raimund Preidl, Jutta Ries, Phillip Stockmann

Published in: Clinical Oral Investigations | Issue 6/2015

Abstract

Objectives

Site-specific suppression of bone remodelling has been implicated in bisphosphonate-(BP)-related osteonecrosis of the jaws (BRONJ). Due to the origin of jaw bone from cranial neural crest, osseous differentiation is regulated specifically by the antagonizing BMP-2-downstream-transcription factors Msx-1 and Dlx-5. Osteopontin has been implicated in bone remodelling and angiogenesis. The osteoblast and osteoclast progenitor proliferation mediating Msx-1 has been demonstrated to be suppressed in BRONJ. In vitro BPs were shown to increase Dlx-5 and to suppress osteopontin expression. This study targeted Dlx-5 and osteopontin in BRONJ-related and BP-exposed jaw bone compared with healthy jaw bone samples at protein- and messenger RNA (mRNA) level, since increased Dlx-5 and suppressed osteopontin might account for impaired bone turnover in BRONJ.

Materials and methods

Fifteen BRONJ-exposed, 15 BP-exposed and 20 healthy jaw bone samples were processed for real-time reverse transcription polymerase chain reaction (RT-PCR) and for immunohistochemistry. Targeting Dlx-5, osteopontin and glyceraldehyde 3-phosphate dehydrogenase mRNA was extracted, quantified by the LabChip-method, followed by quantitative RT-PCR. For immunohistochemistry, an autostaining-based alkaline phosphatase antialkaline phosphatase (APAPP) staining kit was used. Semiquantitative assessment was performed measuring the ratio of stained cells/total number of cells (labelling index, Bonferroni adjustment).

Results

The labelling index was significant decreased for osteopontin (p < 0.017) and significantly increased for Dlx-5 (p < 0.021) in BRONJ samples. In BRONJ specimens, a significant fivefold decrease in gene expression for osteopontin (p < 0.015) and a significant eightfold increase in Dlx-5 expression (p < 0.012) were found.

Conclusions

BRONJ-related suppression of bone turnover is consistent with increased Dlx-5 expression and with suppression of osteopontin. The BP-related impaired BMP-2–Msx-1–Dlx-5 axis might explain the jaw bone specific alteration by BP.

Clinical relevance

The findings of this study help to explain the restriction of RONJ to craniofacial bones. BRONJ might serve as a model of disease elucidating the specific signal transduction of neural crest cell-derived bone structures in health and disease.

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Title: BRONJ-related jaw bone is associated with increased Dlx-5 and suppressed osteopontin—implication in the site-specific alteration of angiogenesis and bone turnover by bisphosphonates
Authors: Falk Wehrhan
Kerstin Amann
Patrick Möbius
Manuel Weber
Raimund Preidl
Jutta Ries
Phillip Stockmann
Publication date: 01-07-2015
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 6/2015
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-014-1354-7

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

BRONJ-related jaw bone is associated with increased Dlx-5 and suppressed osteopontin—implication in the site-specific alteration of angiogenesis and bone turnover by bisphosphonates

Abstract

Objectives

Materials and methods

Results

Conclusions

Clinical relevance

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Objectives

Materials and methods

Results

Conclusions

Clinical relevance

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