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  • Title: [Influence of parathyroid hormone and estrogen on alveolar bone metabolism of castrated female rats].
    Author: Sun Z, Lin Z, Bai G, Di J, Jiang L.
    Journal: Hua Xi Kou Qiang Yi Xue Za Zhi; 2014 Apr; 32(2):134-7. PubMed ID: 24881206.
    Abstract:
    OBJECTIVE: To investigate the influence of parathyroid hormone and estrogen on alveolar bone metabolism of castrated female rats. METHODS: Sixty-six female Wistar rats which were healthy and 4 months old were divided into two groups, with group SHAM (n = 18) and group ovariectomy (OVX) (n = 48). After 8 weeks of ovariectomy, the osteoporosis model was confirmed by examing 8 ovariectomized and sham-operated rats. The rest 10 rats in group SHAM were the control group (group A). The rest 40 rats in group OVX were divided into ovariectomized group (group B), ovariectomized and treated with estrogen (group C), ovariectomized and treated with parathyroid hormone (group D), ovariectomized and treated with estrogen and parathyroid hormone (group E) at random with 10 in each group. Group A and B injected physiological saline (1 mL x kg(-1)), group C injected estradiol benzoate (10 microg x kg(-1)), group D injected parathyroid hormone (20 microg x kg(-1)), group E injected parathyroid hormone (20 microg x kg(-1)) and estradiol benzoate (10 microg x kg(-1)). The intraperitoneal injection were maken every other day to rats in each group, which continued for 8 weeks. The bone mineral density (BMD), bone histomorphology and serum Ca, P, alkaline phosphatase (ALP) were measured after therapy. RESULTS: After 8 weeks of ovariectomy, the lumbar BMD of ovariectomized rats were significantly declined compared with those of the sham-operated rats (P < 0.05). Eight weeks later after the drug use, the BMD, %Tb.Ar, Tb.Th, Tb.N in group C, D, E were slightly elevated compared to group B, especially the group E (P < 0.05). Serum calcium and phosphorus values did not change significantly (P > 0.05). ALP values in group B was significantly higher than that in group A (P < 0.05). CONCLUSION: Intermittent application of parathyroid hormone in small doses can increase alveolar BMD of castration rats and improve their bone structure. And it can have synergy effects on the treatment of osteoporosis if it is used combining with estrogen. 目的: 观察甲状旁腺激素与雌激素单独和联合应用对去势雌性大鼠牙槽骨代谢的影响。 方法: 选用4月龄雌性Wistar大鼠66只，分成两组，分别为伪手术组（n=18）和去势组（n=48）。8周后各处死8只证实骨质疏松造模成功。剩余的伪手术组（A组，n=10）Wistar大鼠作为对照；将剩余的去势组Wistar大鼠随机分成4组，分别为去势组（B组）、去势加雌激素组（C组）、去势加甲状旁腺激素组（D组）、去势加雌激素和甲状旁腺激素组（E组），每组10只。A组和B组注射生理盐水（1 mL·kg−1）；C组注射苯甲酸雌二醇（10 µg·kg−1）； D组注射甲状旁腺激素（20 µg·kg−1）；E组注射苯甲酸雌二醇（10 µg·kg−1）和甲状旁腺激素（20 µg·kg−1）。隔日腹腔注射1次，用药8周。治疗后处死大鼠并测定牙槽骨骨密度，观察每组大鼠骨组织形态计量学参数及血清钙、磷、碱性磷酸酶（ALP）水平。 结果: 去势手术8周后，去势组大鼠牙槽骨密度明显低于伪手术组（P<0.05）。用药8周后，C、D、E组骨密度、骨小梁面积百分比（%Tb.Ar）、骨小梁宽度（Tb.Th）和骨小梁数量（Tb.N）较B组均有明显提高，其中E组提高最明显（P<0.05）。各组血清钙磷值无明显改变（P>0.05），B组ALP值较A组明显升高（P<0.05）。 结论: 间歇性、小剂量注射甲状旁腺激素能增加去势大鼠牙槽骨的骨密度和改善骨结构，与雌激素联合使用对骨质疏松的治疗有协同作用。
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