Decreased endosteal formation during cortical bone modelling in SAM-P/6 mice with a low peak bone mass
Abstract
Inter-strain differences in bone mass and density during growth were followed in three strains of mice: SAM-P/2, SAM-R/1 and SAM-P/6 (a murine model of senile osteoporosis, Matsushita et al., Am J Pathol 1986;125:276-283). Photometrically, the inter-strain disparities first appeared in mice at about age 28 days and increased until age 60 days. During this period, tetracycline labelling revealed significant strain differences regarding rate of the appositional formation at the endosteal surface but not at the periosteal surface. The order coincided with results of the photometrical assay, that is, highest in SAM-P/2, followed by SAM-R/1 and SAM-P/6, respectively. Therefore, strain differences, especially the osteopenic state of SAM-P/6, occur, at least in part, by disparities in endosteal formation rates during cortical bone modelling.
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