title: Genistein inhibits osteolytic bone metastasis and enhances bone mineral in nude mice.
abstract: In this study, the effective activity of genistein on osteolytic bone metastasis and bone mineral was investigated. Female BALB/c-nu/nu mice were injected with estrogen receptor-negative human breast cancer cells, MDA-MB-231, into left cardiac ventricle to form osteolytic bone metastases, and administered genistein subcutaneously after radiologically small but defined osteolytic metastases had been observed (protocol 1), simultaneously with cancer cells inoculation (protocol 2) and prophylactically 7 days before inoculation of cancer cells (protocol 3). In all protocols, genistein (10mg/kg/day) markedly reduced the number and volume of osteolytic bone metastases assessed by radiography and the number of osteoclasts. Furthermore, histomorphometrical analysis revealed that genistein markedly increased trabecular area (Tb.Ar%), trabecular thickness (Tb.Th) and trabecular number (Tb.N), and decreased trabecular separation (Tb.Sp). These results thus demonstrate that genistein could inhibit osteolytic bone metastases, suppress bone resorption, increase bone mass and improve bone microstructure in bone metastases of breast cancer.
authors.affiliation: Department of Environmental Epidemiology and Bone Toxicology, Institute of Radiation Medicine, Fudan University, No. 2094 Xietu Road, Shanghai 200032, China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Guoying
authors.initials: G
authors.lastname: Zhu
authors.forename: Shuzhu
authors.initials: S
authors.lastname: Gu
authors.forename: Xiao
authors.initials: X
authors.lastname: Chen
authors.forename: Heping
authors.initials: H
authors.lastname: Hu
authors.forename: Shifang
authors.initials: S
authors.lastname: Weng