Effect of alendronate on endochondral ossification in mandibular condyles of growing rats

  • V. Bradaschia-Correa Division of Oral Biology, School of Dentistry, University of São Paulo, Brazil.
  • F.A.C. Barrence Department of Cell and Developmental Biology, Institute of Biomedical Sciences, University of São Paulo, Brazil.
  • L.B. Ferreira Division of Oral Biology, School of Dentistry, University of São Paulo, Brazil.
  • L.F. Massa Division of Oral Biology, School of Dentistry, University of São Paulo, Brazil.
  • V.E. Arana-Chavez | vearana@usp.br Division of Oral Biology, School of Dentistry, University of São Paulo, Brazil.

Abstract

The replacement of the calcified cartilage by bone tissue during the endochondral ossification of the mandibular condyle is dependent of the resorbing activity of osteoclats. After partial resorption, calcified cartilage septa are covered by a primary bone matrix secreted by osteoblasts. Osteoadherin (OSAD) is a small proteoglycan present in bone matrix but absent in cartilage during the endochondral ossification. The aim of this study was to analyze the effect of alendronate, a drug known to inhibit bone resorption by osteoclasts, on the endochondral ossification of the mandibular condyle of young rats, by evaluating the distribution of osteoclasts and the presence of OSAD in the bone matrix deposited. Wistar newborn rats (n=45) received daily injections of alendronate (n=27) or sterile saline solution as control (n=18) from the day of birth until the ages of 4, 14 and 30 days. At the days mentioned, the mandibular condyles were collected and processed for transmission electron microscopy analysis. Specimens were also submitted to tartrate resistant acid phosphatase (TRAP) histochemistry and ultrastructural immunodetection of OSAD. Alendronate treatment did not impede the recruitment and fusion of osteoclasts at the ossification zone during condyle growth, but they presented inactivated phenotype. The trabeculae at the ossification area consisted of cartilage matrix covered by a layer of primary bone matrix that was immunopositive to OSAD at all time points studied. Apparently, alendronate impeded the removal of calcified cartilage and maturation of bone trabeculae in the mandibular ramus, while in controls they occurred normally. These findings highlight for giving attention to the potential side-effects of bisphosphonates administered to young patients once it may represent a risk of disturbing maxillofacial development.

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Author Biographies

V. Bradaschia-Correa, Division of Oral Biology, School of Dentistry, University of São Paulo
Division of Oral Biology, School of Dentistry
F.A.C. Barrence, Department of Cell and Developmental Biology, Institute of Biomedical Sciences, University of São Paulo
Cell and Developmental Biology, Institute of Biomedical Sciences
L.B. Ferreira, Division of Oral Biology, School of Dentistry, University of São Paulo
Division of Oral Biology, School of Dentistry
L.F. Massa, Division of Oral Biology, School of Dentistry, University of São Paulo
Division of Oral Biology, School of Dentistry
V.E. Arana-Chavez, Division of Oral Biology, School of Dentistry, University of São Paulo
Division of Oral Biology, School of Dentistry
Published
2012-05-25
Section
Original Papers
Keywords:
endochondral ossification, osteoclast, chondroclast, alendronate, calcified cartilage, osteoadherin, condyle
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How to Cite
Bradaschia-Correa, V., Barrence, F., Ferreira, L., Massa, L., & Arana-Chavez, V. (2012). Effect of alendronate on endochondral ossification in mandibular condyles of growing rats. European Journal of Histochemistry, 56(2), e24. https://doi.org/10.4081/ejh.2012.24