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中华口腔医学研究杂志(电子版) ›› 2012, Vol. 6 ›› Issue (03) : 251 -256. doi: 10.3877/cma.j.issn.1674-1366.2012.03.006

基础研究

肝素对大鼠下切牙釉原蛋白水平及细胞凋亡的影响
杨婧1, 赵玮1,(), 林家成1, 刘丽敏1   
  1. 1.510055 广州,中山大学光华口腔医学院·附属口腔医院,广东省口腔医学重点实验室
  • 收稿日期:2011-12-16 出版日期:2012-06-01
  • 通信作者: 赵玮
  • 基金资助:
    广东省科技计划国际合作项目(2010B050700004)广东省科技计划社会发展项目(2009B030801183)

The effect of heparin o n amelogenin content and apoptosis of odontogenic cells in rat lower incisor

Jing YANG1, Wei ZHAO1,(), Jia-cheng LIN1, Li-min LIU1   

  1. 1.Guanghua School of Stomatology,Hospital of Stomatology, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology,Guangzhou 510055, China
  • Received:2011-12-16 Published:2012-06-01
  • Corresponding author: Wei ZHAO
引用本文:

杨婧, 赵玮, 林家成, 刘丽敏. 肝素对大鼠下切牙釉原蛋白水平及细胞凋亡的影响[J/OL]. 中华口腔医学研究杂志(电子版), 2012, 6(03): 251-256.

Jing YANG, Wei ZHAO, Jia-cheng LIN, Li-min LIU. The effect of heparin o n amelogenin content and apoptosis of odontogenic cells in rat lower incisor[J/OL]. Chinese Journal of Stomatological Research(Electronic Edition), 2012, 6(03): 251-256.

目的

建立肝素诱导骨质疏松大鼠模型,观察肝素的应用对大鼠下切牙釉原蛋白水平及其细胞凋亡的影响。

方法

取24 只4 周龄清洁级Sprague-Dawley(SD)大鼠随机分为两组,实验组每日于腹部皮下注射肝素1 U/g,对照组于相同部位注射等体积0.9%氯化钠溶液。 4 周后取大鼠右侧股骨测骨密度值。 同时取下颌骨,沿正中联合分为两份,一侧颌骨及下切牙脱钙后制作石蜡切片,行釉原蛋白免疫荧光染色;另一侧脱钙后制作石蜡切片,行原位末端标记(TUNEL)染色,观察下切牙细胞的凋亡情况。 实验数据采用SPSS 17.0 统计软件包进行统计学分析。

结果

实验组大鼠股骨的骨密度值为(0.185±0.006) g/cm2,低于对照组的(0.196±0.011) g/cm2;实验组下切牙釉原蛋白免疫荧光染色强度为(0.0432±0.0043),低于对照组的(0.0570±0.0096);两组骨密度及荧光强度差异均具有统计学意义(P<0.05)。 实验组未见细胞凋亡发生,对照组可见个别成牙本质细胞及中间层细胞凋亡阳性着色。

结论

肝素可诱导大鼠骨质疏松,降低下切牙釉原蛋白表达及抑制细胞凋亡的发生。

Objective

To establish heparin-induced osteoporosis model in rat and investigate the amelogenin content and the apoptosis of odontogenic cells in rat lower incisors.

Methods

Twentyfour Sprague-Dawley (SD) rats were divided into 2 groups randomly. The experimental group was injected with heparin at the abdomen subcutaneous with 1 U/g each day, and the control group was injected same volume of normal sodium (NS) at the same site. All rats were sacrificed and their right femurs were obtained to measure the bone mineral density (BMD) 4 weeks later, the mandibles were harvested and divided into two parts along the centric junction. Immunofluorescence and TUNEL stain were performed. The data were statisticaly analyzed by SPSS 17.0 software.

Results

The right femur BMD was (0.185±0.006) g/cm2 in the experimental group while it's (0.196±0.011) g/cm2 in the control group. The fluorescence intensity of amelogenin of lower incisors immunofluorescence stain is (0.0432 ±0.0043) in the experimental group albeit it is (0.0570 ± 0.0096) in the control group. The difference between these groups was statistically significance (P<0.05). A few odontoblasts and stratum intermedium cells in control group were apoptosis positive by TUNEL stain. In contrast, there was no apoptosis cell in the heparin group.

Conclusions

Heparin could lead to osteoporosis and reduce the content of amelogenin, as well as inhibit apoptosis odontogenic cells in rat lower incisor.

图1 两组大鼠股骨骨密度测量结果例图 A.实验组;B.对照组;BMD 为骨密度测量值
图2 SD 大鼠下切牙颈环处成釉细胞及成牙本质细胞胞浆中釉原蛋白染色(免疫荧光染色×200) A~B. 釉原蛋白荧光染色; C~D. 细胞核DAPI(4'6-联脒-2-苯基吲哚二盐酸盐)染色; E. A、C 合成图; F. B、D 合成图。所指为成釉细胞基底膜; 所指为成釉细胞层; 所指为成牙本质细胞层;★所示为未矿化牙本质层;★★所示为未矿化釉质层
图3 下牙槽骨质及骨髓细胞中釉原蛋白染色(免疫荧光染色 × 200) A~B. 釉原蛋白荧光染色; C~D. 细胞核DAPI(4'6-联脒-2-苯基吲哚二盐酸盐)染色; E. A、C 合成图; F. B、D 合成图。 ★所示为骨髓腔;★★所示为骨小梁
图4 SD 大鼠下切牙颈环处分泌期成釉器细胞及成牙本质细胞TUNEL 检测(TUNEL 染色 × 400) A.实验组;B.对照组;C.自身骨髓细胞阳性对照;→所指为阳性染色
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