Matrix metalloproteinase-9 expression in alveolar extraction sockets of zoledronic acid-treated rats

David L. Basi, Pamela Hughes, Vivek Thumbigere-Math, Ma'Ann Sabino, Ami Mariash, Scott A. Lunos, Eric Jensen, Rajaram Gopalakrishnan

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Purpose: The use of nitrogen-containing bisphosphonates (n-bis) is associated with necrosis of the jaws, also known as bisphosphonate-related osteonecrosis of the jaws (BRONJ); however, the pathophysiology is unknown. Matrix metalloproteinase-9 (MMP-9) expression is essential for normal bone healing and is also required for angiogenesis. N-bis alters MMP-9 expression in vitro and in vivo; therefore, we hypothesized that n-bis alters MMP-9 expression during oral wound healing after tooth extraction. Materials and Methods: A total accumulated dose of 2.25 mg/kg (n = 20) of Zoledronic acid (ZA) Zometa or saline (control, n = 20) was administered to SpragueDawley male rats. Next, both groups had maxillary molar teeth extracted. Rats were sacrificed at postoperative day 1, 3, 7, or 21. Western blotting or multiplex ELISA was used to evaluate proteins of interest. Real-time polymerase chain reaction was used to assess the relative quantities of target gene mRNA. MMP-9 enzymatic activity was assessed by zymography. Results: The ZA group showed a statistically significant reduction in bone mineralization rate 21 days after tooth extraction compared with the control group (Student t test, P =.005). Moreover, ZA-treated animals showed a statistically significant increase in MMP-9-specific mRNA at postoperative days 3 (P =.003), 7 (P .05). Receptor of NF-κB ligand (RANKL) is known to regulate the expression of MMP-9; we therefore assessed the RANKL expression in our experimental oral wound-healing model. The ZA-treated animals had significantly increased RANKL mRNA at postoperative days 3 (P =.02) and 21 (P =.004), while the protein expression was significantly increased at postoperative days 1 (P

Original languageEnglish (US)
Pages (from-to)2698-2707
Number of pages10
JournalJournal of Oral and Maxillofacial Surgery
Volume69
Issue number11
DOIs
Publication statusPublished - Nov 2011
Externally publishedYes

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ASJC Scopus subject areas

  • Oral Surgery
  • Otorhinolaryngology
  • Surgery

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