Bone Abstracts

Background: Collagen has biocompatibility and biodegradability with tissue or organ, therefore, collagen is the most promising material for tissue engineering. In particular, the binding of collagen to specific cells is considered an essential function to develop scaffolds. However, in some cases the binding inhibits the cell motility. In addition, it is not clear whether collagen is the effective scaffold to promote osteogenic differentiation. These days, we succeeded in deve...

Background: Three-dimensional scaffolds for the tissue regeneration are also crucial materials for bone formation. In particular, the scaffolds must provide the space for the cell migration and new bone formation. Collagen is one of the useful scaffolds to reach these performance, however, it is not always a desired biodegradability. Recently, we succeeded in developing low adhesive scaffold type I collagen (LASCol) (patent pending) which has the ability to form fibrils. In th...

Introduction: Indirect inhibition of the extracellular BMP antagonist network and the activation of Wnt signaling by PTH1-34 suggest the possibility of synergistic effect on bone regeneration by the co-administration of BMP and PTH1-34.Materials and methods: In a rat critical-sized femoral defect (7 mm) model, SD rats (n=32) were operated by absorbable collagen sponge containing two different BMP-2 dosage treatments; 1) 2 μg (low dose) and ...

Ibandronate (IBN), a nitrogen-containing bisphosphonate, and eldecalcitol (ELD), an active vitamin D3 derivative, are used for osteoporosis treatment. Vitamin D3 often used in combination therapies, however, there are no reports on the effects of combined IBN and ELD treatment for osteoporosis.In this study, we examined the effects of combination treatment with IBN and ELD in aged ovariectomized rats. Eight-month-old Wistar-Imamichi...

Eldecalcitol (ED-71; ELD), a 2β-hydroxypropyloxy derivative of 1α,25(OH)2D3, was approved to treat osteoporosis in Japan in 2011. The endothelial protective effect of vitamin D3 in osteoporosis is not clear. This study evaluated the endothelial protective effect of ELD in ovariectomized (OVX) rats.ELD (20 ng/kg) was orally administered five times a week for 4 weeks from 1 day after OVX surgery. Four weeks after surgery, flow-mediated dilation (...

Eldecalcitol (ED-71; ELD), a 2β-hydroxypropyloxy derivative of 1α,25(OH)2D3, was approved to treat osteoporosis in Japan in 2011. Raloxifene (RAL), a selective estrogen receptor modulator, is available to treat or prevent postmenopausal osteoporosis. In this study, we compared the effects of combining ELD and RAL against each monotherapy in osteoporotic rats.Eight-month-old female Wistar–Imamichi rats were ovariectomi...

Objectives: Recent studies have demonstrated that vitamin K2 (VitK2) induces apoptosis of not only osteoclasts but also rheumatoid arthritis (RA) synovial cells in vitro, while its clinical effect on disease activity of RA remains unknown.Methods: 158 female RA patients (age 62.5 years, duration of disease 14.9 years) who had not been treated with warfarin, biologics, or teriparatide were enrolled in this study. VitK2 (45 mg/day) was administered orally ...

Objective: To examine the efficacy and safety of direct administration of zoledronate acid (ZOL) on local osteoporotic lesion of ovariectomized rats.Methods: Six weeks later after ovariectomy, 16 6-month-old female S.D. rats were divided into the two groups with no differences of body weight and BMD of the proximal tibia. In the group L, 50 μl ZOL at a dose of 67 μg/kg were locally injected into the bone marrow between the two dr...

Objectives: Sox9 is a dominant but insufficient transcription factor to induce thorough primary chondrogenesis, so other factors which may induce primary chondrogenesis besides Sox9 have been assumed. The previously reported function of transcription factor Nkx3.2 is to maintain chondrogenic phenotype by suppressing Runx2, while recent studies demonstrated that mouse Nkx3.2 null mice shows severe metaphyseal dysplasia which is similar to that seen in type II collagen a1 (Col2a...

Introduction: A synthetic prostacyclin IP receptor agonist (ONO-1301) has been reported to induce the production of endogenous HGF and VEGF in fibroblasts by stimulating cAMP production.Materials and methods: In vitro; murine primary osteoblasts and cell line (ST2, MC3T3-E1, C2C12) were treated with BMP-2 (0–100 ng/ml) and ONO-1301 (0–10−6 M). ALP assay and cell proliferation assay were performed. In vivo analysis, Col...