绝经后血清BMP-7、OCN水平与骨质疏松的相关性研究

目的探究骨形态发生蛋白-7(BMP-7)、骨钙素(OCN)在绝经后骨质疏松(OP)患者血清中的水平与骨代谢指标骨特异性碱性磷酸酶(BAP)、I型胶原交联氨基末端肽(NTX)及骨密度(BMD)的相关性。方法选取2017年5月至2019年3月收治的93例绝经女性OP患者作为OP组;并以同期来我院进行健康体检的86例绝经女性作为对照组进行研究;以实时荧光定量PCR(qRT-PCR)法检测两组受试者血清BMP-7、OCN表达水平;以酶联免疫吸附法(ELISA)检测两组受试者血清BAP、NTX水平,计算BAP/NTX比值;利用双能X线骨密度仪测定两组受试者骨密度;分析OP患者血清BMP-7、OCN表达水平与骨代谢相关指标、BMD的相关性及BMP-7表达水平与OCN的关系; Logistic回归分析OP发生的影响因素。结果 OP组患者雌二醇水平、血清BMP-7、OCN、BAP/NTX、BMD水平均明显低于对照组(t=11.962、9.969、12.823、4.052、18.215,P均0.05); OP组患者血清BAP、NTX水平均明显高于对照组(t=4.014、9.092,P均0.05); OP患者血清BMP-7、OCN表达水平与BAP、NTX均呈负相关(P均0.05),与BAP/NTX、BMD均呈正相关(P均0.05),BMP-7表达水平与OCN呈正相关(P 0.05);雌二醇、BMD是影响OP发生的保护险因素(95%CI=0.536～0.978、0.335～0.916,P均0.05),BAP、NTX是影响OP发生的危险因素(95%CI=1.336～1.859、1.427～2.357,P均0.05)。结论绝经女性血清BMP-7、OCN表达水平下调,BMP-7、OCN与骨代谢指标及BMD密切相关,两者可能与BAP、NTX、BMD相互影响,从而在OP发展进程中发挥作用。     

健康人群血清骨钙素影响因素的研究 —— 以北京市海淀区为例

目的了解健康人群血清OC的变化及与能量代谢的关系。方法根据排除标准筛选115名受试者(男60人,女55人),用电化学发光法和终点法检测血清OC,能量代谢指标水平,并分析血清OC与TC、TG、HDL-C、LDL-C、FINS、FPG、HOMA-IR之间的关系。结果绝经后女性OC水平与男性、绝经前女性差异存在统计学意义(P0.05)。相关性分析中,男、女性年龄与血清OC之间均呈显著负相关(r_男=-0.517和r_女=-0.568)。男、女性BMI与血清OC之间均呈显著负相关(r_男=-0.286和r_女=-0.453)。男性HDL-C与血清OC之间呈显著正相关(rHDL-C=0.271)。女性TG与血清OC之间呈显著负相关(r_(TG)=-0.340);女性HDL-C与血清OC之间呈显著正相关(rHDL-C=0.275)。男性FINS、HOMA-IR与血清OC之间呈显著负相关(r_(FINS)=-0.295,rHOMA-IR=-0.28)。女性FPG、FINS、HOMA-IR与血清OC之间无显著相关性。结论在选取的受试者中,绝经后女性血清OC水平明显低于绝经前女性,绝经后女性出现肥胖较明显。年龄、BMI与血清OC呈显著负相关,即血清OC可能导致肥胖。血清OC与机体能量代谢相关。     

人牙周膜细胞克隆与牙骨质瘤细胞克隆体外钙化的比较

目的：研究瘤性成牙骨质细胞和牙周膜细胞克隆体外不同的生物学特性。方法：对瘤性成牙骨质（CTM）细胞和牙周膜（PDL）细胞进行克隆化培养，分别观察细胞的钙化形态并检测培养液中骨钙素（OC）的含量。结果：其钙化的形式有两种，一种为弥散型钙化，一种为结节状钙化。PDL组结节状钙化为细胞钙化总数的16％，而CTM组结节样钙化为钙化总数的62％（P＜0.01)。两种钙化形式的克隆细胞16d时的OC含量有明显的不同。结论：结节状钙化形式可能是成牙骨质细胞钙化的特有形式之一，这对今后牙周细胞的移植和牙周组织工程的研究有一定的指导意义。     

骨钙素在神经退行性疾病中的研究进展

骨骼不仅是一个全身的支持器官,更是活跃的内分泌器官。由成骨细胞分泌的骨钙素（osteocalcin,OC）脱羧后进入血液循环,不仅可以调节全身能量代谢、性功能,还可以穿过血脑屏障,与海马、中脑及脑干神经元上的G蛋白偶联受体158（G protein coupled receptor158,Gpr158）结合,增加单胺类神经递质合成,减少γ-氨基丁酸（γ-aminobutyric acid,GABA）类神经递质合成,从而促进空间学习和记忆,减轻焦虑。动物实验还发现OC可以穿越胎盘屏障,对胎儿大脑发育产生影响,并且这种激素随着年龄的增长呈降低趋势,可能参与了老年性疾病的病理过程。笔者对OC的结构与功能及在阿尔茨海默症和帕金森病两种神经退行性疾病方面的研究进展进行综述。     

芝麻素对大鼠骨质疏松症的作用研究

目的 在大鼠模型中探讨芝麻素对骨质结构改变的作用及对骨钙素和I型胶原表达的影响。方法 建立去卵巢(ovariectomized, OVX)大鼠模型,给予芝麻素(sesamin, 80 mg/kg)灌胃作为干预措施并同时建立对照组。应用显微计算机断层扫描(Micro-CT)对大鼠股骨进行分析,并应用免疫组化及免疫荧光检测大鼠股骨中的骨钙素(osteocalcin, OCN)水平以及I型胶原表达。结果 本实验研究条件下,与OVX组相比,OVX+S骨密度(bone mineral density, BMD)增加、小梁间距(trabecular spacing, Tb.Sp)降低,同时,干预组骨钙素和I型胶原表达显著增强(P<0.05)。结论 芝麻素可有效促进去卵巢大鼠骨结构重塑,对大鼠骨质疏松症有积极的治疗和预防作用。     

Magnesium ions facilitate integrin alpha 2‐ and alpha 3‐mediated proliferation and enhance alkaline phosphatase expression and activity in hBMSCs

Magnesium metal and its alloys have been proposed as a novel class of bone implant biomaterials because of their biodegradability and mechanical properties. The purpose of this study was to determine whether magnesium ions, which are released abundantly from alloys, affect proliferation and differentiation of human bone marrow‐derived stromal cells (hBMSCs). High levels of magnesium ions did not induce cytotoxicity in hBMSCs, but treatment with 2.5–10 mm magnesium ions for 48–72 h significantly increased hBMSC proliferation. The expression of integrins α2 and α3, but not β1, was upregulated compared with the control and shifted from α3 to α2 in hBMSCs treated with magnesium ions. Knockdown of integrins α2 and/or α3 significantly reduced magnesium‐induced proliferation of hBMSCs. Magnesium exposure profoundly enhanced alkaline phosphatase (ALP) gene expression and activity even at a relatively low magnesium concentration (2.5 mm ). Exposure to magnesium ions facilitated hBMSC proliferation via integrin α2 and α3 expression and partly promoted differentiation into osteoblasts via the alteration of ALP expression and activity. Accordingly, magnesium could be a useful biomaterial for orthopaedic applications such as bone implant biomaterials for repair and regeneration of bone defects in orthopaedic and dental fields. Copyright © 2014 John Wiley & Sons, Ltd.     

Correlation between osteocalcin‐positive endothelial progenitor cells and spotty calcification in patients with coronary artery disease

Immature endothelial progenitor cells (EPC) carrying osteocalcin (OCN) might mediate vascUlar calcification in coronary artery disease (CAD). Spotty calcification within atherosclerotic plaque is associated with cardiovascular events. The aim of the present study was to assess the correlation between immature EPC levels and spotty calcification in CAD patients. In the 224 CAD patients studied, 76 had acute myocardial infarction (AMI), 102 had unstable angina pectoris (UAP), and 46 had stable angina pectoris (SAP). The levels of OCN‐positive (OCN+) EPC were analysed by flow cytometry. The status of spotty calcification was determined by cardiac computed tomography angiography. OCN+ EPC and calcium deposits were significantly increased in acute coronary artery syndrome (ACS) when compared with those in SAP patients. Positive correlation was also revealed between the number of OCN+ EPC and the frequency of spotty calcification and levels of serum high‐sensitivity C‐reactive protein (hs‐CRP) and serum alkaline phosphatase in AMI and UAP patients. In summary, the number of OCN+ EPC is positively related to the frequency of spotty calcification in ACS patients. Serum hs‐CRP and serum alkaline levels are thought to contribute to the elevation of OCN+ EPC.     

Effects of Polygonatum sibiricum polysaccharide on the osteogenic differentiation of bone mesenchymal stem cells in mice

Polygonatum sibiricum polysaccharide (PSP) is a traditional Chinese medicine and is widely used to treat many diseases for hundreds of years conventionally. This study was to access the effects of PSP on the osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs) in the mice. Cells collected from BALB/C mice in the bone marrow were isolated and cultured with osteogenic medium (OM) with different concentrations of PSP. The proliferation and morphological changes of BMSCs were observed using an inverted microscope. Flow cytometric analysis was used to identify the BMSCs. MTT test was performed to analyze the proliferation and viability of the cells. ELISA was used to determine the expression levels of alkaline phosphatase (ALP), osteocalcin (OC), N-terminal propeptide of type I procollagen (PINP) and bone morphogenetic protein-2 (BMP-2). Immunocytochemistry and western blot were respectively used to determine the expressions of bone sialoprotein (BSP) and SPARC/osteonectin (OSN). The growth curves of the proliferation and differentiation of the Control, OM, 17β-E₂ and PSP groups were increased. Compared to the Control and OM groups, the expression levels of ALP, OC, PINP and BMP-2 were significantly increased in the PSP induced group (P<0.05). Immunocytochemistry and western blot showed that BSP and SPARC were increased after induction of PSP compared to the OM group (P<0.05). The study demonstrates that PSP promotes the proliferation and enhances the viability of BMSCs during osteogenic differentiation. Therefore, PSP may be a potential treatment of osteoporosis in the clinic.     

观察自拟中药汤剂联合西药治疗骨质疏松的临床疗效及其对骨代谢生化指标和血中骨钙素的影响

目的观察自拟中药汤剂联合西药治疗骨质疏松的临床疗效及其对骨代谢生化指标和血中骨钙素的影响。方法 124例骨质疏松患者随机分为两组。对照组用西药治疗,治疗组在对照组基础上结合自拟中药汤剂治疗。1个月后对两组疗效及相关指标进行观察。结果治疗组治疗后总有效率显著高于对照组(P0.05);治疗组治疗后U-Ca、ALP与对照组比较具有显著性差异(P0.05);治疗组治疗后血中骨钙素明显高于对照组(P0.05);两组患者在治疗过程中均未出现明显不良反应。结论自拟中药汤剂联合西药治疗骨质疏松患者效果显著。