实验性骨质疏松模型骨组织中核因子表达特征及其意义

目的 探讨核因子NF-KBP50、NF-KBP65在骨质疏松发病过程中的意义。方法选用4个月龄雌性BALB／C小鼠随机分假手术对照组（CON组）和去卵巢骨质疏松模型组（OVX组）,术后第12周测量全身骨密度后处死,取股骨下端用ABC免疫组织化学、原位杂交方法测定骨组织中核因子的蛋白含量及表达水平并进行细胞定位。结果OVX组与CON组相比,骨密度下降,股骨骨小梁稀疏、成骨细胞数目减少而破骨细胞数目增多;免疫组织化学染色结果显示,NF-kB P50、NF-kB P65蛋白在模型组和对照组均有阳性表达,主要位于骨小梁周边成骨细胞、骨细胞及骨髓细胞胞浆中,OVX组蛋白含量均高于CON组,且与骨密度呈负相关（P〈0．01或P〈0．05）;原位杂交结果表明,OVX组NF-kB P50 mRNA、NF-kB P65 mRNA表达显著高于CON组（P〈0．05）。结论骨质疏松骨组织及骨髓中核因子的蛋白含量及表达水平升高,在骨质疏松骨微环境中的表达异常并与骨密度明显相关。

The expression characteristics and biological significance of nuclear factor- kappa B in mice bone tissue of experimental osteoporosis models

Objective To study the expression characteristics and biological significance of nuclear factor NF-kappaB p50 and NF-kappaB p65 in osteoporosis development. adult mice were ovariectomized as models of experimental osteoporosis.In this way ,we can explore the molecular mechanism of osteoporosis and understand the significance during the morbility of osteoporosis. Methods Four-month female BALB/c mice were randomly divided into ovariectomized group and sham-operated group. 12 weeks after surgery, the mice were sacrificed after the measurement of bone mineral density (BMD). The NF-kappaB level in bone tissue were determined by immunohistochemistry and in situ hybridization techniques. Results Compared with the sham-operated group, bone density, rarefaction of trabecula and the number of osteoblast decreased in the ovariectomized group, while the number of osteoclast increased in the ovariectomized group. The immunohistochemistry showed that NF-kappaB expressed in both groups. It mainly localized in the cytoplasm of osteoblast, osteocytes and marrow stroma cell. The expression level in the ovariectomized group was higher than that in the sham-operated group and was negatively correlated with the BMD(P<0.01 or P<0.05). In situ hybridization demonstrated that the expression levels of NF-kappaB 50mRNA and NF-kappaB 65mRNA in ovariectomized group were significantly higher than that of the sham-operated group(P <0.05). Conclusion The expression level of NF-kappaB significantly increased in the bone tissue of ovariectomized mice, and its unnormal expression was significantly corelated with BMD.