我国北方成年人下颌骨骨密度的测量研究

Objective To measure the bone mineral density(BMD)of mandible and investigate the relationship between mandible and the whole body skeleton BMD.Methods Healthy volunteers were recruited in north China,which were divided into 6 groups by age:≥20,≥30,≥40,≥50,≥60 and ≥70 years older,10 male and 10 female in each group.Dual-energy X-ray absoptiometery(DXA)was used to measure the BMD of the lumbar spine,the mentum of mandible and the mandibular angle.The results were analyzed statistically.Results The mineral density(MD )of the mentum was(1.310 9 ±0.035 5)g/cm2,the left mandibular angle(1.048 9 ± 0.013 7)g/cm2,the right mandibular angle (1.0547 ±0.014 1)g/cm2,the lumbar spine(L2-L4)(1.121 1±0.017 2)g/cm2.There was a significant difference in mandibular angle and lumbar MD between men and women(P＜0.05).The MD of mandibular angle and lumbar spine decreased significantly after 50 years of age.Conclusions The normal BMD of the mandibular mentum,mandibular angles and lumbar spine is obtained.The BMD of the mandibular angles is closely related to that of the lumbar spine.Mandible can be an appropriate measurement site in the evaluation of skeleton BMD status for the forecast of osteoporosis.     

我国北方成年人下颌骨骨密度的测量研究

Objective To measure the bone mineral density(BMD)of mandible and investigate the relationship between mandible and the whole body skeleton BMD.Methods Healthy volunteers were recruited in north China,which were divided into 6 groups by age:≥20,≥30,≥40,≥50,≥60 and ≥70 years older,10 male and 10 female in each group.Dual-energy X-ray absoptiometery(DXA)was used to measure the BMD of the lumbar spine,the mentum of mandible and the mandibular angle.The results were analyzed statistically.Results The mineral density(MD )of the mentum was(1.310 9 ±0.035 5)g/cm2,the left mandibular angle(1.048 9 ± 0.013 7)g/cm2,the right mandibular angle (1.0547 ±0.014 1)g/cm2,the lumbar spine(L2-L4)(1.121 1±0.017 2)g/cm2.There was a significant difference in mandibular angle and lumbar MD between men and women(P＜0.05).The MD of mandibular angle and lumbar spine decreased significantly after 50 years of age.Conclusions The normal BMD of the mandibular mentum,mandibular angles and lumbar spine is obtained.The BMD of the mandibular angles is closely related to that of the lumbar spine.Mandible can be an appropriate measurement site in the evaluation of skeleton BMD status for the forecast of osteoporosis.     

应用细胞片层技术构建组织工程骨

背景:传统的骨组织工程学在收获和转移细胞方面仍存在诸多不足,细胞片层技术是收获种子细胞和对种子细胞进行转移的一项新技术.目的:应用细胞片层技术与传统骨组织工程相结合的方法构建组织工程骨.方法:密度梯度离心法分离培养犬骨髓间充质干细胞,诱导其向成骨细胞分化.将诱导后的骨髓间充质干细胞接种至温度反应性培养皿中,先37 ℃饱和湿度培养,然后降温至20 ℃制备细胞片层;将犬脱钙骨基质/富血小板血浆/骨髓间充质干细胞细胞片层/骨髓间充质干细胞复合体植入犬左侧背阔肌下,术后4,8,12周,观察成骨情况.结果与结论:当温度降至20 ℃时,骨髓间充质干细胞从温度反应性培养皿上完全脱落,形成细胞片层,将其覆盖于犬脱钙骨基质/富血小板血浆/骨髓间充质干细胞后植入犬背阔肌下,其成骨效果明显好于不加细胞片层对照侧.说明应用细胞片层技术与传统的骨组织工程方法相结合可构建出较理想的组织工程骨.     

犬同种异体脱钙骨基质复合骨髓基质干细胞片层与内皮祖细胞的体外培养

目的:观察犬骨髓基质干细胞(bone marrow stroma stem cells,BMSCs)细胞片层及内皮祖细胞(endothelial progenilor cells,EPCs)在脱钙骨基质(demineralized bone matrix,DBM)上的生长情况,探讨利用其复合体构建功能性血管化组织工程骨的可行性.方法:应用细胞片层技术制备BMSCs细胞片层,培养犬内皮祖细胞,制备犬同种异体DBM.将DBM分别与BMSCs细胞片层、内皮祖细胞复合.测量DBM孔隙率,倒置相差显微镜、扫描电镜下观察DBM的结构及BMSCs细胞片层、EPCs在DBM上的附着、生长情况.结果:成功构建DBM/BMSCs细胞片层、DBM/EPCs复合体,BMSCs细胞片层、EPCs在DBM上的附着、生长状况良好,增殖迅速.结论:DBM/BMSCs细胞片层、DBM/EPCs复合体能够为生成具有骨样结构的组织工程骨提供良好的条件,并为组织工程骨的血管化创造有利的环境.     

骨髓基质干细胞片层的制备及其在组织工程骨中应用的初步研究

目的：探讨骨髓基质干细胞（bone marrow stromal cells,BMSCs）片层（cell sheet）的制备方法,并观察其在实验犬体内构建组织工程骨时的成骨作用。方法：密度梯度离心法获取实验犬骨髓基质干细胞,经成骨诱导培养后,利用温度感应性培养皿（temperature-responsive culture dish）制备细胞片层后在体外包裹犬同种异体脱钙骨基质（demineralized bone matrix,DBM）,相差显微镜和扫描电镜观察细胞及片层形态;将复合体植入实验犬背阔肌筋膜下,组织学方法观察术后组织工程骨的骨形成情况。结果：细胞片层成功制备,并与支架材料复合良好,术后16周组织学显示形成类似板层骨的致密骨组织。结论：利用温度反应性培养皿可成功制备BMSC细胞片层,细胞片层包裹支架材料后在实验动物体内可形成具有类似板层骨结构的组织工程骨。     

骨髓基质干细胞的体外培养及其细胞片层制备

目的探讨犬骨髓基质干细胞(BMSCs)的体外培养及成骨向诱导后细胞片层的制备方法。方法密度梯度离心法分离培养犬BMSCs,向成骨细胞方向诱导分化后,倒置相差显微镜和扫描电镜下进行形态学观察;将诱导后的BMSCs接种至温度反应性培养皿中,37℃、5%CO2饱和湿度培养,然后降温至20℃制备BMSCs的细胞片层。结果原代培养的BMSCs呈长梭形,漩涡状生长;向成骨细胞诱导后的BMSCs呈卵圆形或多角形,当温度降至20℃时,BMSCs从温度反应性培养皿上完全脱落。扫描电镜下观察可见到富含细胞外基质的完整BMSCs细胞片层。结论应用密度梯度离心法可有效获取BMSCs,并向成骨细胞诱导分化;应用温度反应性培养皿能获取完整的BMSCs细胞片层可包裹支架,并用于功能性成骨。     

我国北方成年人下颌骨骨密度的测量研究

目的 研究健康人下颌骨与全身骨密度的相关性.方法 选择中国北方健康志愿者221名,分别将不同性别的志愿者按年龄分为6组,即≥20岁(男21人、女23人)、≥30岁(男20人、女21人)、≥40岁(男21人、女22人)、≥50岁(男20人、女21人)、≥60岁(男16人、女15人)、≥170岁(男11人、女10人).从每人下颌骨颏部及双侧下颌角各选10个感兴趣区,用双能X线骨密度仪测量骨密度值,同时测量腰椎(L2-L4);并行统计学分析.结果 该人群的下颌骨颏部的骨密度值为(1.310 9±0.035 5)g/cm2,左下颌角的骨密度值(1.048 9±0.013 7)g/cm2,右下颌角的骨密度值(1.054 7±0.014 1)g/cm2,腰椎(L2-L4)的骨密度值(1.1211±0.0172)g/cm2.男女之间下颌角、腰椎的骨密度比较,差异有统计学意义(t(左)=2.017 5,t(右)=2.446 9,P<0.05).50岁以后下颌角、腰椎的骨密度明显减低.结论 下颌骨与腰椎的骨密度密切相关,下颌骨可以作为测量全身骨密度的一个敏感部位进行骨质疏松的预测.     

我国北方成年人下颌骨骨密度的测量研究

Objective To measure the bone mineral density(BMD)of mandible and investigate the relationship between mandible and the whole body skeleton BMD.Methods Healthy volunteers were recruited in north China,which were divided into 6 groups by age:≥20,≥30,≥40,≥50,≥60 and ≥70 years older,10 male and 10 female in each group.Dual-energy X-ray absoptiometery(DXA)was used to measure the BMD of the lumbar spine,the mentum of mandible and the mandibular angle.The results were analyzed statistically.Results The mineral density(MD )of the mentum was(1.310 9 ±0.035 5)g/cm2,the left mandibular angle(1.048 9 ± 0.013 7)g/cm2,the right mandibular angle (1.0547 ±0.014 1)g/cm2,the lumbar spine(L2-L4)(1.121 1±0.017 2)g/cm2.There was a significant difference in mandibular angle and lumbar MD between men and women(P＜0.05).The MD of mandibular angle and lumbar spine decreased significantly after 50 years of age.Conclusions The normal BMD of the mandibular mentum,mandibular angles and lumbar spine is obtained.The BMD of the mandibular angles is closely related to that of the lumbar spine.Mandible can be an appropriate measurement site in the evaluation of skeleton BMD status for the forecast of osteoporosis.     

应用细胞片层技术构建组织工程骨

背景：传统的骨组织工程学在收获和转移细胞方面仍存在诸多不足,细胞片层技术是收获种子细胞和对种子细胞进行转移的一项新技术。目的：应用细胞片层技术与传统骨组织工程相结合的方法构建组织工程骨。方法：密度梯度离心法分离培养犬骨髓间充质干细胞,诱导其向成骨细胞分化。将诱导后的骨髓间充质干细胞接种至温度反应性培养皿中,先37℃饱和湿度培养,然后降温至20℃制备细胞片层;将犬脱钙骨基质/富血小板血浆/骨髓间充质干细胞细胞片层/骨髓间充质干细胞复合体植入犬左侧背阔肌下,术后4,8,12周,观察成骨情况。结果与结论：当温度降至20℃时,骨髓间充质干细胞从温度反应性培养皿上完全脱落,形成细胞片层,将其覆盖于犬脱钙骨基质/富血小板血浆/骨髓间充质干细胞后植入犬背阔肌下,其成骨效果明显好于不加细胞片层对照侧。说明应用细胞片层技术与传统的骨组织工程方法相结合可构建出较理想的组织工程骨。     

犬骨髓间充质干细胞片层的体外培养与制备

背景:传统的组织工程方法在收获和转移细胞方面存在诸多不足,且难以形成致密的组织,明显限制了组织工程学的发展.目的:探讨犬骨髓间充质干细胞片层的体外培养与制备方法.方法:实验犬麻醉后抽取骨髓,采用密度梯度离心法体外分离骨髓间充质干细胞.取传至第4代细胞,按1×10~9 L-1密度接种于商径3.5 cm的温度反应性培养皿中,置于37℃、体积分数为5%的CO_2饱和湿度培养箱内培养,待细胞增殖融合时再将培养皿的温度降至20℃培养20 min,倒置显微镜下观察细胞形态学变化及细胞片层形成情况.结果与结论:犬骨髓间充质干细胞原代培养24 h呈椭圆形或多角形,72 h多数细胞伸展贴壁,7 d时形成细胞集落,12 d时细胞呈长梭形,完全融合,细胞界限不清.温度反应性培养皿中的骨髓间充质干细胞在降温至20℃时,细胞形态发生变化,呈短梭形,且逐步从培养皿底分离,形成含细胞外基质的完整的细胞片层.证实密度梯度离心法可成功分离培养犬骨髓间充质干细胞,通过改变应用温度反应性培养皿的温度,能获取完整的细胞片层.