21 d尾吊大鼠承重骨中骨形态发生蛋白、转化生长因子β含量的变化

目的观察21 d 模拟失重对大鼠胫骨骨形态发生蛋白(BMP)、转化生长因子-β(TGF-β)含量及股骨生长情况的影响.方法雄性SD大鼠14只按体质量配对后随机等分为对照组(CON)和尾部悬吊模拟失重组(TS),21 d实验结束后处死大鼠,取股骨检测物理性状,取胫骨免疫组化法检测BMP、TGF-β变化情况.结果 21 d悬吊期间大鼠生长良好,未出现明显应激反应.21 d模拟失重后大鼠股骨湿重、干重、灰分、直径和密度均显著降低(P<0.01);免疫组化结果显示大鼠胫骨中BMP和TGF-β减少.结论 21 d模拟失重使大鼠后肢骨生长受抑, BMP、TGF-β在局部合成及分泌降低.

Changes of Bone Morphogenesis Proteins and Transforming Growth Factor-β in Hind-limb Bones of 21 d Tail-suspensded Rats

Objective: To investigate changes of bone morphogenesis proteins (BMP), transforming growth correction of grouth] factors-beta (TGF-beta) in tibia and the growing of femur in tail-suspended rats after 21 d simulated weightlessness. Method: Fourteen male SD rats were randomly divided into control group (CON) and tall-suspension group (TS). After 21 d tail-suspension, basic physical parameters of the femur were measured; changes of BMP, TGF-beta in tibia were assayed by immunohistochemical method. Result: During 21 d tail-suspension, all rats grew well without apparent stress reaction. After 21 d weightlessness simulation, wet weight, dried weight, ash, diameter and density of femur in TS group declined significantly (P<0.01). Immunohistochemical results of tibia showed that both BMP and TGF-beta declined in tissues from all regions of the tibia. Conclusion: After 21 d tall-suspension, the growth of rat's weight bearing bones were suppressed, production and secretion of BMP and TGF-beta was holdback.