摘要目的 复制燃煤型氟中毒大鼠模型,并观察骨形成蛋白-2(BMP-2)和骨形成蛋白-3 (BMP-3)在不同染氟剂量和染氟时间大鼠血清中的表达变化.方法 断乳4周80～ 120 g清洁级SD大鼠120只,按体质量随机分为对照组、低氟组、中氟组、高氟组,每组30只,雌雄各半.食用病区煤烘玉米,复制燃煤型氟中毒动物模型.对照组、低氟组、中氟组、高氟组的含氟量分别为6.30、9.56、15.89、23.00mg/kg.各组分别于染氟第30、90、180天时股动脉放血法处死10只动物,酶联免疫吸附测定(ELISA)法检测血清BMP-2和BMP-3水平.结果 ①BMP-2测定结果:染氟第90、180天时,血清BMP-2组间比较差异有统计学意义(F值分别为385.08、173.98,P均＜0.01).其中低氟组、中氟组、高氟组在染氟第90天时[(18.80±0.43)、(22.22±0.85)、(25.14±0.69)μg/L]和第180天[(7.98±0.68)、(8.97±0.78)、(15.04±0.89)μg/L]血清BMP-2表达高于对照组[(12.54±1.29)、(7.53±0.97)μg/L,P均＜0.05],且BMP-2表达随着染氟剂量的增加而增加(P均＜0.05).4组不同染氟时间血清BMP-2组内比较差异有统计学意义(F值分别为55.42、511.58、686.35、671.64,P均＜0.01).其中染氟第90天时,各组血清BMP-2[(12.54±1.29)、(18.80±0.43)、(22.22±0.85)、(25.14±0.69)μg/L]均高于同组染氟第30天时[(11.75±1.15)、(11.42±1.07)、(11.38±0.92)、(11.15±1.03)μg/L,P均＜0.05]；染氟第180天时,各组血清BMP-2[(7.53±0.97)、(7.98±0.68)、(8.97±0.78)、(15.04±0.89)μg/L]均低于同组染氟第90天时(P均＜ 0.05).②BMP-3测定结果:染氟第30、90、180天时,血清BMP-3组间比较差异无统计学意义(F值分别为0.7215、1.2951、0.0964,P均＞0.05).结论 大鼠较长时间摄人过量氟,刺激BMP-2表达增强,但随着摄氟时间延长,氟对BMP-2的表达呈现抑制作用.氟对BMP-3表达的影响不及对BMP-2敏感.

abstractsObjective To establish a rat model of coal-burning-borne fluorosis,and to observe the expression changes of bone morphogenetic protein-2 (BMP-2) and bone morphogenetic protein-3 (BMP-3) in the serum of rat treated with different dose of fluoride and different treatment duration.Methods A total of 120 clean grade SD rats(body mass between 80 to 120 g) weaned for 4 weeks were randomly assigned into four groups,which were control,low-dose fluorid,medium-dose fluorid and high-dose fluorid groups,respectively,and 30 rats in each group (female 15,male 15).All of the rats were fed with coal drying corn from fluorosis area.Ten rats were killed by femoral artery bleeding 30 d,90 d and 180 d after exposed to fluoride,respectively.Serum BMP-2 and BMP-3 level was tested by enzyme-linked immunosorbent assay (ELISA).Results ①Results of BMP-2:after exposed to fluoride for 90 d and 180 d,the differences of serum BMP-2 level between groups were statistically significant(F=385.08,173.98,all P ＜ 0.01).In low-dose fluorid,medium-dose fluorid and high-dose fluorid groups,the expression of serum BMP-2 at 90 d[(18.80 ± 0.43),(22.22 ± 0.85),(25.14 ± 0.69)μg/L] and 180 d[(7.98 ± 0.68),(8.97 ± 0.78),(15.04 ± 0.89)μg/L] was higher than that of control group[(12.54 ± 1.29),(7.53 ± 0.97)μg/L,all P ＜ 0.05],and the level of BMP-2 increased with increasing dose of fluoride (all P ＜ 0.05).Within each group,the difference of serum BMP-2 was statistically significant(F =55.42,511.58,686.35,671.64,all P ＜ 0.01).The expression of BMP-2 in each group at 90 d [(12.54 ± 1.29),(18.80 ± 0.43),(22.22 ± 0.85),(25.14 ± 0.69)μg/L] was higher than that at 30 d[(11.75 ± 1.15),(11.42 ± 1.07),(11.38 ± 0.92),(11.15 ±1.03)μg/L,all P ＜ 0.05].The expression of BMP-2 in each group at 180 d[(7.53 ± 0.97),(7.98 ± 0.68),(8.97 ± 0.78),(15.04 ± 0.89) μg/L] was lower than that at 90 d.②Results of BMP-3:the difference between groups was not statistically significant at every experimental stage(F =0.7215,1.2951,0.0964,all P ＞ 0.05).Conclusions Longer excessive fluoride intake stimulates the expression of BMP-2 in rats,but with prolonged fluoride intake,the stimulation becomes weak.The effect of fluoride on BMP-3 is not as sensitive as that on BMP-2.