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催产素受体基因敲除对雌激素调节骨密度作用的影响
作者:刘璇  
单位:东南大学
关键词:雌激素 催产素 骨密度 卵巢切除 骨质疏松 
分类号:
出版年·卷·期(页码):2010·29·第六期(603-607)
摘要:

目的 探讨催产素受体基因敲除对雌激素调节骨代谢作用的影响。 方法 选取3月龄野生型Oxtr+/+和纯合型Oxtr-/-雌性BABL/c小鼠各20只,随机分成8组,每组5只:①野生型组(WT),②野生型+雌二醇组(WT+E2),③野生型去势组(WT OVX),④野生型去势+雌二醇组(WT OVX+E2),⑤纯合型组(KO),⑥纯合型+雌二醇组(KO+E2),⑦纯合型去势组(KO OVX),⑧纯合型去势+雌二醇组(KO OVX+E2)。17β-雌二醇皮下注射,每只50μg,每天1次。实验4周后测量各组小鼠脊柱和股骨的骨密度。 结果 与WT组相比,WT E2组的骨密度显著增高(P<0.05),WT OVX组的骨密度显著降低(P<0.05),WT OVX+E2组的骨密度无显著差异(P>0.05);与WT OVX组比较,WT OVX+E2组的骨密度明显增高,差异显著(P<0.05)。与KO组比,KO E2组、KO OVX组及KO OVX+E2组的骨密度差异均无统计学意义(P>0.05);KO OVX+E2组与KO OVX组相比,骨密度也无显著差异(P>0.05)。 结论 催产素参与调节雌激素的骨合成代谢作用。

Object To explore the effect of Oxtr knockout on estrogen regulating bone metabolism. Methods Three-month old Oxtr+/+ and Oxtr-/- female BABL/c mice (20 mice per genotype) were randomly divided into 8 groups, 5 mice per group: ① wild type group (WT), ② wild type + estradiol group (WT+E2), ③ wild type OVX group (WT OVX), ④ wild type OVX + estradiol group (WT OVX+E2), ⑤ Oxtr knockout group (KO), ⑥ Oxtr knockout + estradiol group (KO+E2), ⑦ Oxtr knockout OVX group (KO OVX), ⑧ Oxtr knockout OVX + estradiol group (KO OVX+E2). After injecting 17β-estradiol (50 µg/mice/day, s.c.) for 4 weeks, spine and femur bone mineral density (BMD) of all group mice were measured. Results BMD of WT OVX group mice were markedly lower than that of WT group mice. Injecting 17β-estradiol observably increased BMD of WT E2 group mice compared with WT group mice. Moreover, the decline in BMD of WT OVX mice was remarkably reversed by 17β-estradiol. But there was no significant difference on BMD between KO group and KO OVX group mice, and both of KO E2 group and KO OVX E2 group mice failed to respond to 17β-estradiol. Conclusion Oxytocin is required for the anabolic action of estrogen on the skeleton.

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