骨细胞密度对骨生物力学性能的影响  被引量:3

Osteocyte density may be an important influencing factor for the bone biomechanical property

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作  者:马育林[1] 戴如春[2] 盛志峰[2] 张玉海[3] 金艳[2] 廖二元[2] 

机构地区:[1]南方医科大学附属小榄医院内分泌科,中山528415 [2]中南大学湘雅二医院代谢内分泌研究所 [3]海南省人民医院内分泌科

出  处:《中华老年医学杂志》2009年第6期500-504,共5页Chinese Journal of Geriatrics

基  金:湖南省自然科学基金(06JJ50029);国家自然科学基金资助项目(30400514);卫生部临床学科重点建设资助项目(2004-468-50)

摘  要:目的探讨骨细胞密度是否为衡量骨生物力学性能的指标。方法40只7月龄雌性SD大鼠随机分为去卵巢组(OVX)、OVX+金雀异黄酮(GEN,5mg·kg^-1·d^-1)和OVX+17β雌二醇(EST,10μg·kg^-1·d^-1)组及假手术组(SHAM),每组10只。手术后15周第5腰椎(L5)椎体进行压缩试验,L6椎体先行显微CT扫描测量三维骨密度和骨微结构参数,然后进行疲劳损伤试验,最后行大块组织品红染色、塑料包埋和磨片。磨片标本用于微损伤、骨细胞密度检测。结果去卵巢后15周时,OVX组骨细胞密度为(1268.1±191.2)个/mm^2,较SHAM组(1760.8±376.6)个/mm^2及EST组(1550.9±202.2)个/mm^2降低(F=3.531,P〈0.05);OVX组最大应力为(84.4±16.9)N,较SHAM(110.3±25.6)N、EST(103.9±15.8)N及GEN组(110.1±4.9)N降低(F=9.561,P〈0.05);OVX组骨小梁连接密度为(47.4±7.4)mm^-1,较SHAM(71.8±16.0)mm^-3及EST组(74.0±12.7)mm^-3降低(F=7.635,P〈0.05);OVX组骨矿含量为(6.5±2.2)g,较SHAM组(7.9±1.2)g降低(F=2.489,P〈0.05);OVX组微破裂平均长度(58.1±6.8)μm,较SHAM(24.2±8.1)μm、EST(36.5±9.7)μm及GEN组(28.5±7.5)μm增加(F=3.179,P〈0.05);OVX组骨小梁间隔(315.0±32.7)μm,较SHAM(222.5±21.7)μm及EST组(273.3±50.0)μm增加(F=7.007,P〈0.05)。骨细胞密度与最大应力(R^2=0.7874,P〈0.05)、骨小梁连接密度(R^2=0.1153,P〈O.05)、骨矿含量(R^2=0.1309,P〈0.05)呈正相关,与微破裂平均长度(R^2=0.5738,P〈0.05)、骨小梁分离度(R^2=0.3964,P〈0.05)负相关。结论骨细胞在维持骨力学性能中起重要作用,骨细胞密度可能是潜在的评价骨力学性能的重要指标。Objective To investigate osteocyte density as a potential index of bone biomechanical property. Methods Forty 7 month old female Sprague-Dawley rats were randomly divided into four groups: ovariectomized (OVX) group, OVX + genistein (5 mg · kg^-1 · d^-1 , intraperitoneal injection) group, OVX+ 17β-estrogen (10 μg · kg ^-1· d^-1, intraperitoneal injection) group (EST) and sham operation group (SHAM). At 15 weeks postoperation, the compression test was performed on L5 vertebral body and micro computed tomography (μ-CT) was used to estimate the three-dimensional bone mineral density (BMD) and three-dimensional microstructure parameters of L6 vertebral body. After fatigue damage testing, the L6 vertebral body was bulk-stained in 1% basic fuchsin and embedded in metbylmethacrylate. Mounted bone slices were used to measure microcrack parameters and osteocyte density. Results At 15 weeks postoperation, osteocyte density (Or. N/T. area) was significantly decreased in OVX group compared with SHAM group and ESTgroup [(1268.1± 191.2)/mm^2 vs. (1760.8±376.6)/mm^2 and (1550.9±202.2)/mm^2, F= 3. 513,P〈0.05]. Maximum load (ML) was significantly decreased and the length of microcrack (Cr. Le) was significantly increased in OVX group compared with SHAM group, EST group and GEN group [(84.4±16.9)N vs. (110.3±25.6),(103.9±15.8)and(110.1±4.9)N; (58.1±6.8) μm vs. (24.2±8.1), (36.5±9.7)and(28.5±7.5)μm, F=9.561,3.179, all P〈0. 05]. Compared with SHAM group and EST group, bone trabecula connection density (Conn. D) was significantly decreased and trabecular separation (Tb. Sp) was significantly increased in OVX group 〈(47.4±7.4) m^-3 vs. (71. 8±16. 0)and (74.0±12.7)m^-3(315.0±32.7)μm vs. (222.5±21.7)and (273.3±50.0)μm, F=7.635,7.007, allP〈0.05]. Bone mineral content (BMC) was lower in OVX group than that in SHAMgroup[(6. Si2.2)gvs. (7.9±1.2)g, P〈0.05]. When data in f

关 键 词:骨细胞 骨密度 雌二醇 

分 类 号:R686[医药卫生—骨科学]

 

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