Age-related bone loss in lumbar vertebrae of CW-1 female mice: A histomorphometric study

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Abstract
Age-related changes in vertebral cortical and trabecular bone were quantitated in female CW-1 mice. Histomorphometric measurements involved the use of two different systems of image analysis: Olympus Cue 2 and Zeiss Morphomat 10. The peak of bone mass, both cortical and trabecular, was found in mice aged 13.5 months. Thereafter, there was a progressive decline in the area occupied by bone tissue and this became highly significant in elderly female and male mice. A loss of about 60% of bone tissue was encountered in both the trabecular and cortical bone, as determined by automated image analysis system. Hence, aging CW-1 mice reveal structural features consistent with vertebral osteopenia. Despite the fact that to date we lack the precise etiology for the abovementioned phenomenon, it is suggested that the laboratory mouse might serve as an appropriate experimental model for investgations related to agerelated bone loss.