title: The stimulatory effect of insulin-like growth factor-1 on the proliferation, differentiation, and mineralisation of osteoblastic cells from Holstein cattle.
abstract: This study investigated the effect of exogenous insulin-like growth factor (IGF)-1 on the proliferation and differentiation of osteoblastic cells from Chinese Holstein cattle and the resultant bone nodule formation and mineralisation in vitro. The osteoblastic cells were isolated and cultured, then identified using Giemsa and alkaline phosphatase (ALP) staining methods. The effect of different concentrations of IGF-1 on cell growth was assessed by MTT assay. The ALP activity and osteocalcin (OC) concentration in the osteoblastic cells were measured by a colorimetric assay and a radioimmmunoassay, respectively. Calcium nodules were observed using alizarin red S stain, while the content of matrix calcium was determined by atomic absorption spectrophotometry. Cell proliferation in the cultures was stimulated by IGF-1 at concentrations ranging from 1 to 200ng/mL, with the maximum effect observed at 100ng/mL. This effect was observed from day 1 and peaked at day 5, but decreased at day 7. At concentrations of 10ng/mL and 100ng/mL, IGF-1 significantly induced ALP activity, OC level, matrix calcium content, and nodule formation of the osteoblastic cells by 20-180% (P<0.05 or P<0.01), compared to controls. The results suggested that IGF-1 is an anabolic agent for the proliferation, differentiation, mineralisation and calcium content of dairy cow osteoblasts, and could therefore act as a potential treatment for the metabolic bone diseases in these animals.
authors.affiliation: Department of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.
authors.forename: Su-Hua
authors.initials: SH
authors.lastname: Li
authors.forename: Ding-Zong
authors.initials: DZ
authors.lastname: Guo
authors.forename: Bing
authors.initials: B
authors.lastname: Li
authors.forename: Hong-Bin
authors.initials: HB
authors.lastname: Yin
authors.forename: Jia-Kui
authors.initials: JK
authors.lastname: Li
authors.forename: Jing-Mei
authors.initials: JM
authors.lastname: Xiang
authors.forename: Gan-Zhen
authors.initials: GZ
authors.lastname: Deng
mesh_terms: D000818:Animals; D015519:Bone Density / Q000187:drug effects* / Q000502:physiology; D001846:Bone Development / Q000187:drug effects; D001842:Bone and Bones / Q000187:drug effects / Q000378:metabolism*; D002113:Calcification, Physiologic / Q000187:drug effects* / Q000502:physiology; D002417:Cattle; D002454:Cell Differentiation / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D007334:Insulin-Like Growth Factor I / Q000494:pharmacology*; D010006:Osteoblasts / Q000187:drug effects* / Q000502:physiology
chemical_list: D007334:Insulin-Like Growth Factor I