title: Stimulatory effect of ipriflavone on formation of bone-like tissue in rat bone marrow stromal cell culture.
abstract: The effects of ipriflavone (IP) (10(-5) M) on bone formation were studied in stromal cells from the femoral bone marrow of young adult rats cultured for 21 days in the presence of beta-glycerophosphate and dexamethasone. Stereoscopic microscopy showed nodule formation after 14 days of culturing, and both the number and the size of the nodules increased with time. The alizarin-red-stained calcified area in the nodules in the IP group was nearly 4 times as large as that in the control after 21 days. Light and electron microscopy revealed the presence of many osteoblast-like cells with developed rough endoplasmic reticulum and Golgi apparatus in the nodules in the control group after 14 days, and a collagenous fibril network was seen among the cells. After 21 days, calcification of the dense collagenous fibril network and bone matrix-like tissue were observed in many nodules, resulting in the formation of bone-like tissue containing osteocyte-like cells. In the IP group, the collagenous fibril network area in the nodules was greater than that in the control after 14 days, and a further increase in both the dense collagenous fibril network area and calcified bone-like tissue area was observed after 21 days. These findings indicate that IP stimulates bone-like tissue formation in the rat bone marrow stromal cell culture, suggesting that the promotion of collagen production by osteoblasts is involved in the stimulation of bone-like tissue formation by IP.
authors.affiliation: Pharmaceutical Research Laboratories II, Takeda Chemical Industries, Ltd., Osaka, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Notoya
authors.forename: R
authors.initials: R
authors.lastname: Tsukuda
authors.forename: K
authors.initials: K
authors.lastname: Yoshida
authors.forename: S
authors.initials: S
authors.lastname: Taketomi
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000187:drug effects; D001854:Bone Marrow Cells; D002478:Cells, Cultured; D004721:Endoplasmic Reticulum / Q000648:ultrastructure; D006056:Golgi Apparatus / Q000648:ultrastructure; D007529:Isoflavones / Q000494:pharmacology*; D008297:Male; D008854:Microscopy, Electron; D010006:Osteoblasts / Q000166:cytology / Q000187:drug effects* / Q000648:ultrastructure; D010012:Osteogenesis / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley; D017154:Stromal Cells / Q000187:drug effects / Q000648:ultrastructure
chemical_list: D007529:Isoflavones; C018986:ipriflavone