摘要目的:观察使用刺猬蛋白（Hedgehog）信号阻断剂环巴胺（cyclopamine，Cycl）对慢性氟中毒大鼠骨组织中神经胶质瘤相关癌基因同源蛋白1（glioma-associated oncogene homolog 1, Gli1）及β链蛋白（β-catenin）表达的影响，探讨两者表达变化在氟致骨形成增强中的意义。方法:SD大鼠48只分为4组，每组12只。对照组饮用自来水（含氟量<1 ppm），氟中毒组（F组）、氟+环巴胺组（F+Cycl组）和氟+二甲基亚砜组（F+DMSO组）分别饮用含50 ppm氟化钠（NaF）的自来水。饲养6个月后分别给F+Cycl组和F+DMSO组大鼠腹腔注射环巴胺和DMSO。检测各组大鼠尿氟含量；酶联免疫吸附试验测定血清骨碱性磷酸酶（bone alkaline phosphatase,BALP）含量；HE染色观察骨组织形态计量学变化；实时荧光定量PCR法、免疫组织化学和蛋白印迹法检测骨组织中Gli1和β-catenin的mRNA和蛋白表达情况。结果:染氟后F组、F+Cycl组和F+DMSO组大鼠尿氟含量、骨小梁密度、骨小梁宽度较对照组明显增加，但3组间未见明显差异（ P>0.05）。F组较对照组血清BALP含量增加，Cycl阻断后血清BALP含量明显降低（ P<0.05）。与对照组比较，F组Gli1和β-catenin mRNA和蛋白均有表达增强。使用Cycl后，两者表达均较F组降低（ P<0.05），而F+DMSO组则无明显变化。Gli1与β-catenin的表达呈正相关关系（ r=0.476， P<0.05）；Gli1、β-catenin蛋白表达与血清BALP、骨小梁密度分别呈正相关关系（ r 1=0.457， r 2=0.466， r 3=0.581， r 4=0.554， P<0.05）。 结论:Cycl可阻断慢性氟中毒大鼠骨组织Gli1表达，并且其影响成骨相关因子β-catenin的表达，这可能参与到氟致骨形成增强的过程中。

abstractsObjective:To investigate the change and association of glioma-associated oncogene homolog 1 (Gli1) and β-catenin on bone formation in rats with chronic fluorosis which were inhibited by cyclopamine (Cycl).Methods:Forty-eight Sprague-Dawley rats were evenly divided to four groups, including control, F, F+Cycl and F+DMSO groups. The control group were fed with tap water (NaF <1 ppm). The F, F+Cycl and F+DMSO groups were exposed to NaF (50 ppm) in drinking water as the chronic fluorosis model. Then the rats in F+Cycl or F+DMSO groups were injected by Cycl or DMSO after 6 months, respectively. Urine fluoride concentration was detected using fluorine ion selective electrode. The enzyme-linked immunosorbent assay (ELISA) was used to detect bone alkaline phosphatase (BALP). Bone tissues were stained with hematoxylin-eosin. The mRNA and protein expression of Gli1 and β-catenin in bone tissue were detected using real-time PCR, immunohistochemistry and Western blot. Results:Compared with the controls, the urine fluoride concentration and the width and volume of bone trabeculae were increased in the F, F+Cycl and F+DMSO groups, but no statistical difference among the 3 fluorosis groups. The concentration of BALP was increased in the F group and decreased in F+Cycl group ( P<0.05). The expression of Gli1 and β-catenin mRNA and protein was higher in the F and F+Cycl groups than controls, but lower in the F+Cycl group than in the F group. There was positive correlation between the expression of Gli1 and β-catenin ( r=0.476, P<0.05). The expression of Gli1 and β-catenin was also associated with BALP concentration and volume of bone trabeculae, respectively ( r 1= 0.457, r2=0.466, r 3= 0.581, r 4= 0.554, respectively, P<0.05 for all). Conclusions:The expression of Gli1 can be inhibited by Cycl. It may be involved in the bone formation of rats with chronic fluorosis. It may also affect the expression of β-catenin, which is an osteogenesis factor.