The Effect of Parathyroid Hormone on Osseointegration in Insulin-Treated Diabetic Rats. Issue 4 (August 2015)

• Record Type: Journal Article
• Authors: Rybaczek, Tina; Tangl, Stefan; Dobsak, Toni; Gruber, Reinhard; Kuchler, Ulrike
• Is Part Of: Implant dentistry. Volume 24:Issue 4(2015:Aug.)
• Publication Date: 2015-08
• Subjects: bone -- teriparatide -- rodent model -- hyperglycemia; Dental implants -- Periodicals; 617.69305
• DOI: 10.1097/ID.0000000000000288
• Languages: English
• ISSNs: 1056-6163

Abstract

Abstract : Objectives: Uncontrolled diabetes mellitus is associated with impaired osseointegration. Diabetic individuals might benefit from bone anabolic therapies. Intermittent administration of 1-34 parathyroid hormone (PTH) stimulates bone formation in rodent models. However, this anabolic effect fails in diabetic rats. Whether the anabolic effect of PTH can be achieved in insulin-controlled diabetic rats has not been investigated yet. Materials and Methods: After diabetes induction with streptozotocin in 40 female Wistar rats, the animals were randomly divided into 4 groups: diabetes, diabetes plus PTH, insulin-treated diabetes, and insulin-treated diabetes plus PTH. After 1 week, miniscrews were inserted in the tibiae. Osmotic pumps with insulin or saline solution were implanted. Animals received 60 mg/kg PTH or saline solution. Histomorphometric analysis was performed. Results: In diabetic rats, no changes of medullary periimplant bone area or bone-to-implant contacts (BICs) were achieved with or without treatment with PTH. However, also animals treated with insulin failed to response significantly to PTH regarding bone area (7.4 ± 4.1% and 8.1 ± 4.1%) and BICs (33.7 ± 16.9% and 49.9 ± 11.9%). Conclusion: These results demonstrate that the metabolic characteristics of the diabetic rats produced a condition unable to respond to PTH treatment, even when hyperglycemia was controlled with insulin.