Systemically available bone morphogenetic protein two and seven affect bone metabolism

Dumić-Čule, Ivo and Brkljačić, Jelena and Rogić, Dunja and Bordukalo Nikšić, Tatjana and Tikvica Luetić, Ana and Drača, Nataša and Kufner, Vera and Trkulja, Vladimir and Grgurević, Lovorka and Vukičević, Slobodan (2014) Systemically available bone morphogenetic protein two and seven affect bone metabolism. International Orthopaedics, 38 (9). pp. 1979-1985. ISSN 0341-2695

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PURPOSE: Bone morphogenetic protein (BMP)-2 and -7 are used in patients with long-bone fractures, nonunions and spinal fusions. It is unknown whether their potential systemic bioavailability following local bone administration might affect skeletal metabolism. To answer this question, we examined effects of systemically administered BMP-2 and -7 on bone in a newly developed rat model with a low level of calciotropic hormones. ----- METHODS: Removal of thyroid and parathyroid glands (TPTx) in rats resulted in a decreased level of calciotropic hormones and subsequent bone loss assessed by micro computed tomography (micro-CT) and measurement of serum bone formation and resorption markers, including osteocalcin, C-telopeptide, osteoprotegerin and receptor activator of nuclear factor kappa-B ligand. Results were complemented with in vitro studies on osteoblast and osteoclast activity by both BMP-2 and -7. The doses used were calculated from published pharmacodynamic studies and bioavailability results from preclinical BMP-2 and -7 studies. ----- RESULTS: TPTx resulted in bone loss, which was restored by systemic administration of 10-70 μg/kg of BMP-2 and 10-250 μg/kg of BMP-7. BMP-2 showed a higher capacity for enhancing trabecular microarchitecture, whereas BMP-7 augmented trabecular thickness. In vitro experiments revealed that BMP-2 and -7 when uncoupled increased the number and activity of both osteoblasts and osteoclasts. ----- CONCLUSIONS: Surprisingly, both BMP-2 and -7 showed an increased bone volume in an in vivo environment of low calciotropic hormones. Locally administered BMP-2 and -7 from bone devices might become partially available in circulation but will not mediate systemic bone loss.

Item Type: Article
MeSH: Animals ; Bone Morphogenetic Protein 2/pharmacology ; Bone Morphogenetic Protein 7/pharmacology ; Bone Remodeling/drug effects ; Bone Resorption ; Bone and Bones/drug effects ; Bone and Bones/metabolism ; Cell Proliferation/drug effects ; Cells, Cultured ; In Vitro Techniques ; Models, Animal ; Osteoblasts/drug effects ; Osteoblasts/pathology ; Osteoclasts/drug effects ; Osteoclasts/pathology ; Osteogenesis/drug effects ; Osteoprotegerin/metabolism ; RANK Ligand/metabolism ; Rats ; Rats, Sprague-Dawley
Departments: Katedra za anatomiju i kliničku anatomiju
Katedra za farmakologiju
Depositing User: Marijan Šember
Status: Published
Brkljačić, JelenaUNSPECIFIED
Bordukalo Nikšić, TatjanaUNSPECIFIED
Tikvica Luetić, AnaUNSPECIFIED
Trkulja, VladimirUNSPECIFIED
Grgurević, LovorkaUNSPECIFIED
Vukičević, SlobodanUNSPECIFIED
Date: September 2014
Date Deposited: 28 Jan 2016 09:58
Last Modified: 16 Jul 2020 09:39
Subjects: /
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