糖尿病大鼠早期骨微结构改变及其BMP-2基因的表达

目的 观察糖尿病大鼠早期的骨密度、骨微结构改变及骨组织中BMP-2基因的表达.方法 清洁级健康成年雄性Wistar大鼠30只,按照随机数字表将其分为A组(普通饲料对照组)、B组(高脂饲料 链脲佐菌素组)和C组(普通饲料 大剂量链脲佐菌素组).饲养12周后,分别对各组大鼠进行骨密度、光镜、扫描电镜、骨形态计量学的观察以及BMP-2基因表达等指标的检测.结果 与A组相比,B组骨微结构无明显变化(P＞0.05),但BMP-2基因表达增高(P＜0.05),C组骨微结构明显改变(P＜0.05),BMP-2基因表达降低,但差异无统计学意义(P＞0.05).结论 不同的糖尿病大鼠模型早期骨微结构及BMP-2基因表达情况改变不完全一致,可能与高胰岛素血症、胰岛素抵抗有一定关系.

Bone microstructure changes and bone BMP-2 expression in rats at early period of diabetes

Objective To investigate the changes of bone density,bone microstructure,bone BMP-2 expression in rats at early period of diabetes.Methods Thirty SPF 4-month-old male Wistar rats were randomly divided into 3 groups(n=10 in each group):A(fed with common forage as normal control group),B(fed with high-lipid forage and intraperitoneally injected with STZ to establish type 2 diabetes with insulin resistance),C(fed with common forage and intraperitoneally injected with STZ to establish type 2 diabetes with insulin secretion defaulting).The bone histomorphology,bone histomorphometry,bone BMP-2 expression were investigated 12 weeks later.Results As compared with group A,bone microstructure was of no obvious changes and bone BMP-2 expression was higher in group B(P<0.05),and obvious bone breakage was observed in group C(P<0.05).Conclusion The changes of bone microstructure and bone BMP-2 expression at the early period of diabetes are not consistent absolutely in individual rat model of diabetes.It maybe relate to hyperinsulinism and insulin resistance.