Please use this identifier to cite or link to this item:
Type: Journal article
Title: The presence of TNF-α and TNFR1 in aseptic root resorption. A preliminary study
Other Titles: The presence of TNF-alpha and TNFR1 in aseptic root resorption. A preliminary study
Author: Curl, L.
Sampson, W.
Citation: Australian Orthodontic Journal, 2011; 27(2):102-109
Publisher: Australian Society of Orthodontists
Issue Date: 2011
ISSN: 0587-3908
Statement of
Linda Curl and Wayne Sampson
Abstract: Background: It is hypothesised that osteoprotegerin (OPG), as an osteoclast antagonist, may offer molecular control over the process of orthodontic root resorption. Previous work investigating OPG in a rat periodontal ligament (PDL) ankylosis model found no inhibitory effect on osteoclasts and odontoclasts when given at a recommended dosage of 2.5 mg/kg. It was considered that traumatically-induced PDL inflammation produces mediators and cytokines with the ability to stimulate clast cell differentiation and counter the effects of OPG. Aims: The present study investigated the presence of Tumour Necrosis Factor Alpha (TNF-α) and its receptor Tumour Necrosis Factor Receptor 1 (TNFR1) in a PDL sterile inflammatory model. Methods: Dry ice was applied for 15 minutes to the upper right first molar crown of eighteen, 8-week-old, male Sprague-Dawley rats of which 9 were injected with OPG at a dose of 2.5 mg/kg of body weight at the time of freezing. After 7 days, the rats were sacrificed and each maxilla processed for immunohistochemical identification of TNF-α and TNFR1. Results: Results showed the presence of root resorption in varying amounts and locations in both experimental and control rats. Reparative processes appeared greater in the OPG-treated rats, often with the presence of an ankylotic union. Immunolabelling showed the presence of TNF-α and TNFR1 in the sterile inflammation located mainly in the interradicular PDL area. More definitive labelling appeared in OPG-treated rats. Conclusion: The results indicated that TNF-α, and its receptor TNFR1, by their presence, may modify OPG effectiveness by offering an alternative pathway for osteoclast formation, which counters the anti-resorptive effects of OPG.
Keywords: Alveolar Process
Giant Cells
Periodontal Ligament
Dental Pulp
Rats, Sprague-Dawley
Dental Pulp Necrosis
Tooth Ankylosis
Root Resorption
Tumor Necrosis Factor-alpha
Receptors, Tumor Necrosis Factor, Type I
Random Allocation
Wound Healing
Cold Temperature
Rights: © Australian Society of Orthodontists Inc. 2011
Appears in Collections:Aurora harvest 5
Dentistry publications

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.