RRC ID 41690
Author Kotani H, Kawaguchi H, Shimoaka T, Iwasaka M, Ueno S, Ozawa H, Nakamura K, Hoshi K.
Title Strong static magnetic field stimulates bone formation to a definite orientation in vitro and in vivo.
Journal J Bone Miner Res
Abstract The induction of bone formation to an intentional orientation is a potentially viable clinical treatment for bone disorders. Among the many chemical and physical factors, a static magnetic field (SMF) of tesla order can regulate the shapes of blood cells and matrix fibers. This study investigated the effects of a strong SMF (8 T) on bone formation in both in vivo and in vitro systems. After 60 h of exposure to the SMF, cultured mouse osteoblastic MC3T3-E1 cells were transformed to rodlike shapes and were orientated in the direction parallel to the magnetic field. Although this strong SMF exposure did not affect cell proliferation, it up-regulated cell differentiation and matrix synthesis as determined by ALP and alizarin red stainings, respectively. The SMF also stimulated ectopic bone formation in and around subcutaneously implanted bone morphogenetic protein (BMP) 2-containing pellets in mice, in which the orientation of bone formation was parallel to the magnetic field. It is concluded that a strong SMF has the potency not only to stimulate bone formation, but also to regulate its orientation in both in vitro and in vivo models. This is the first study to show the regulation of the orientation of adherent cells by a magnetic field. We propose that the combination of a strong SMF and a potent osteogenic agent such as BMP possibly may lead to an effective treatment of bone fractures and defects.
Volume 17(10)
Pages 1814-21
Published 2002-10-1
DOI 10.1359/jbmr.2002.17.10.1814
PMID 12369785
MeSH Alkaline Phosphatase / analysis Animals Biomarkers Bone Morphogenetic Protein 2 Bone Morphogenetic Proteins / pharmacology Cell Differentiation Cell Division Cell Line Cell Polarity Drug Implants Extracellular Matrix / metabolism Humans Magnetics* Male Mice Osteoblasts / physiology* Osteogenesis* / drug effects Recombinant Proteins / pharmacology Transforming Growth Factor beta*
IF 5.854
Times Cited 126
Human and Animal Cells MC3T3-E1(RCB1126)