Abstract：
:Osteoprotegerin (OPG) is a useful receptor in inhibiting Receptor Activator of NFkappaB Ligand (RANKL) in inducing osteoclastogenesis. Tumor Necrosis Factor (TNF)-Related Apoptosis-Inducing Ligand (TRAIL) is a potent apoptosis-inducing ligand in ameloblastomas. Since OPG has been reported to bind to TRAIL as well, the effect of OPG in TRAIL's function in inducing apoptosis should also be investigated. To investigate on the expression of OPG in ameloblastomas, immuhistochemistry, immunofluorescence and Western blot were performed. From the immunohistochemistry results, we found that OPG was expressed in ameloblastoma tissues. Expression of OPG was clearly seen in AM-1 cells by immunofluorescence as well. Additionally, Western blot analysis confirmed OPG expression in ameloblastoma tissues and AM-1 cells. To investigate on the potential of TNFalpha, TRAIL and RANKL in inducing apoptosis, we performed an apoptosis assay. From the apoptosis assay, we found that TRAIL had the highest potential in inducing apoptosis compared to TNFalpha and RANKL. To investigate the binding of OPG with RANKL and TRAIL, we performed a binding assay. We noticed that OPG preferably bind with RANKL than TRAIL. However, at low levels of RANKL, marked binding of OPG with TRAIL was seen. As we suspected that the binding of OPG and TRAIL might cause the effect of TRAIL in inducing apoptosis in ameloblastomas, we combined the treatment of OPG and TRAIL in AM-1 cells. From the apoptosis assay, we found that under treatment of OPG, TRAIL's function in inducing apoptosis was suppressed. These data suggest that by binding with TRAIL, OPG suppressed TRAIL's function in inducing apoptosis in ameloblastomas.
journal_name
Oral Oncoljournal_title
Oral oncologyauthors
Sandra F,Hendarmin L,Nakamura Sdoi
10.1016/j.oraloncology.2005.09.009subject
Has Abstractpub_date
2006-04-01 00:00:00pages
415-20issue
4eissn
1368-8375issn
1879-0593pii
S1368-8375(05)00277-0journal_volume
42pub_type
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