4.5与7.5月龄雌性Sprague-Dawley大鼠骨代谢的变化

目的 :观察雌性SD大鼠 4 .5月龄和 7.5月龄时骨代谢的变化。方法 :4月龄雌性SD大鼠 2 0只 ,随机分 2组 ,饲养至 4 .5月龄和 7.5月龄时 ,用骨组织形态计量学分别测量胫骨上段 (PTM )、腰椎 (LV)及胫骨中段 (Tx)的静态参数和动态参数。结果 :与 4 .5月龄比较 ,7.5月龄大鼠PTM、LV、Tx的骨量无明显变化 ,但LV和Tx的骨形成参数标记周长百分数 (%L .Pm )、矿化沉积率 (MAR )及骨形成率BFR TV、BFR BV、BFR BS均降低。结论 :SD大鼠在 4 .5～ 7.5月龄时 ,松质骨和皮质骨的骨量变化不明显 ,但腰椎和胫骨中段的骨形成随月龄增加而降低。

Changes of bone in female Sprague-Dawley rats aged 4.5 and 7.5 months

AIM: To observe the changes of bone in female Sprague Dawley rats aged 4.5 and 7.5 months. METHODS: Forty 4 month old virgin female Sprague Dawley rats were randomly divided into 4.5 month group and 7.5 month group. Bone histomorphometric analysis of the proximal tibial metaphysis (PTM), tibial shaft (Tx) and the fifth lumbar vertebral body (LV5) was performed in undecalcified sections. RESULTS: There was no significant change in bone volume of PTM, LV5 and Tx between 4.5 and 7.5 months of age. However, the bone formation parameters (%L.Pm, MAR, BFR/TV, BFR/BV, BFR/BS) of LV5 and Tx fall rapidly between 4.5 and 7.5 months of age. CONCLUSION: There is no significant change in cancellous and cortical bone mass, but the bone formation of LV5 and Tx decreases in female Sprague Dawley rats aged from 4.5 to 7.5 months.