Vitamin-D binding protein does not enhance healing in rat bone defects: a pilot study.
Vitamin D-binding protein (DBP) has an anabolic effect on the skeleton and reportedly enhances bone ingrowth. We used an in vivo critical bone defect model to determine whether local administration of DBP promotes bone defect healing. We created a 5-mm segmental bone defect in the radial shaft in a rat model. Forty-eight rats were assigned to eight groups: local application of 1 microg, 5 microg, 10 microg, or 50 microg DBP (DBP-1, DBP-5, DBP-10, DBP-50), autogenous bone marrow mononuclear cells with or without 10 microg DBP (BM-DBP-10, BM), 80 microg BMP-2 delivered in gelatin sponge (BMP-2), and the sham operated group. Radiographic evaluation, histological stains, and epifluorescence microscopy were performed. Grossly, all bone gaps of the BMP-2 group were solidly bridged by callus, while all those in the sham operated group remained unhealed by 9 weeks. Only one specimen of the BM-DBP-10 and DBP-50 groups and three specimens of the BM group were solidly healed; pseudarthroses occurred in all of the other specimens. Histological study and radiographs of the specimens showed similar results. We did not observe the enhanced bone healing reported in a previous study.
Institute of Clinical Medicine, National Yang-Ming University, No. 155, Sec. 2, Linong St., Beitou District, Taipei 11221, Taiwan, ROC. jssun@ym.edu.tw
Jui-Sheng
JS
Sun
Pei-Yu
PY
Chen
Yang-Hwei
YH
Tsuang
Ming-Hong
MH
Chen
Po-Quang
PQ
Chen
D000818:Animals; D016026:Bone Marrow Transplantation; D055396:Bone Morphogenetic Protein 2 / Q000008:administration & dosage; D001861:Bone Regeneration / Q000187:drug effects; D002146:Bony Callus / Q000187:drug effects / Q000503:physiopathology; D004195:Disease Models, Animal; D004305:Dose-Response Relationship, Drug; D017102:Fracture Healing / Q000187:drug effects*; D005781:Gelatin Sponge, Absorbable; D008297:Male; D010865:Pilot Projects; D011542:Pseudarthrosis / Q000503:physiopathology; D011859:Radiography; D011884:Radius / Q000000981:diagnostic imaging / Q000187:drug effects* / Q000503:physiopathology / Q000601:surgery; D011885:Radius Fractures / Q000000981:diagnostic imaging / Q000188:drug therapy* / Q000503:physiopathology; D051381:Rats; D017207:Rats, Sprague-Dawley; D013997:Time Factors; D014809:Vitamin D-Binding Protein / Q000008:administration & dosage*
D055396:Bone Morphogenetic Protein 2; D014809:Vitamin D-Binding Protein