缓激肽B2受体基因多态性+9/-9bp对骨关节炎患者血清NO产物水平的影响

目的为研究缓激肽B2受体(BDKRB2)基因多态性+9/-9 bp与骨关节炎(OA)患者血清中一氧化氮(NO)产物水平的关系,从而更好的了解OA的发病机制。方法本研究共招募了156名膝关节骨关节炎患者和58名健康志愿者参与实验。参与研究对象OA患者的BDKRB2基因多态性被测定后按基因型进行分组,在OA患者滑膜组织中通过实时定量聚合酶链反应(qRT-PCR)检测BDKRB2的mRNA产物表达水平,通过NO检测试剂盒检测血清中NO产物水平。结果我们发现与+9/+9 bp基因型组相比,+9/-9 bp和-9/-9 bp基因型OA患者血清中NO产物水平更高。相关性分析显示BDKRB2 mRNA与NO水平呈显著正相关。与健康对照者相比,OA患者血清中NO产物水平显著升高,并且随着Kellgren-Lawrence(KL)评分增加而增加。多重线性回归分析(MLR)所示(性别和年龄校正后)血清NO产物水平与BDKRB2多态性和KL评分呈正相关,与肥胖呈负相关。结论本研究提示缓激肽B2受体基因+9/-9 bp多态性影响骨关节炎患者中BDKRB2受体基因以及NO产物的表达,其可能作为骨关节炎的一个遗传调制机制在炎症过程中起着关键作用。     

BDKRB2+9/-9基因多态性通过TLR-2表达影响膝骨关节炎中的促炎性细胞因子水平

目的探究缓激肽B2受体(BDKRB2)+9/-9基因多态性和骨关节炎(osteoarthritis,OA)炎性细胞因子水平的关系,以及其涉及的分子机制。方法共有156例膝关节OA患者及121名健康对照者被纳入研究。BDKRB2+9/-9基因多态性被测定分型。用酶联免疫吸附试验(enzyme linked immunosorbent assay,ELISA)测定炎性细胞因子水平,包括肿瘤坏死因子(tumor necrosis factor,TNF)-α、白介素(interleukin,IL)-1β(IL-1β)、IL-6、IL-8。实时荧光定量(polymerase chain reaction,PCR)测定toll样受体(toll-like receptor,TLR)-2和TLR-4的mRNA水平。用ELISA测定TLR-2对基底和缓激肽(bradykinin,BK)刺激促进炎性细胞因子的分泌量。结果在OA患者中-9/-9基因型组血清和滑液TNF-α和IL-8水平显著高于+9/+9组(P0.05);而-9/-9和+9/-9基因型组IL-6水平显著高于+9/+9组。在滑膜组织中-9/-9和+9/-9基因型组的TLR-2 mRNA水平显著高于+9/+9基因型组(P0.01)。BDKRB2拮抗剂MEN16132和TLR-2沉默抑制IL-6和IL-8在人类OA滑膜细胞的分泌(P0.01)。结论 BDKRB2+9/-9多态性可以通过改变TLR-2表达影响膝骨关节炎中的促炎性细胞因子水平。     

瘦素基因启动子区-2548 G/A多态性与胆囊胆固醇结石的相关性分析

目的探讨瘦素基因启动子区-2548 G/A功能多态性与胆囊胆固醇结石之间的相关性。方法采用聚合酶链反应-限制性片段长度多态性技术对118例胆囊结石患者和53例正常对照人群进行瘦素基因启动子区-2548 G/A基因多态性分析,研究等位基因和基因型分布规律。结果瘦素基因启动子区-2548 G/A多态性在2组中的分布差异有统计学意义,胆囊结石组中AA+GA基因型频率明显高于对照组(2χ=4.251,P=0.039),AA+AG基因型患胆囊结石的风险是GG基因型的2.813倍(OR=2.813,95%CI=1.020～7.757)。等位基因频率在2组中分布也存在差异,胆囊结石组A等位基因频率明显高于对照组(2χ=5.791,P=0.016),A等位基因携带者患胆囊结石的风险是G等位基因携带者的1.777倍(OR=1.777,95%CI=1.110～2.844)。结论瘦素基因启动子区-2548 G/A功能多态性与胆囊结石易感性有关,A等位基因是胆囊结石发病的遗传易感基因,G等位基因是胆囊结石的保护基因。     

亚甲基四氢叶酸还原酶C677T单核苷酸多态性与腹腔静脉血栓易感性关系的Meta分析

目的:探讨亚甲基四氢叶酸还原酶(MTHFR)基因C677T单核苷酸多态性(SNP)与腹腔静脉血栓(SVT)易感性的关联情况。方法:检索多个国内外数据库收集MTHFR C677T SNP与SVT相关的病例-对照研究,用Stata 12.0软件分析其基因型和等位基因与SVT的关联性。结果:共纳入19篇文献,包括1 194例患者和1 988例对照。SVT分为门静脉血栓(PVT)、BuddChiari综合征(BCS)和肠系膜静脉血栓(MVT)3个亚组。MTHFR C677T SNP在显性模型CC vs.(CT+TT)下(OR=0.51,95%CI=0.34~0.76,P=0.001)和相加模型CC vs.TT下(OR=0.33,95%CI=0.23~0.47,P0.001)与SVT的关联性有统计学意义;在隐性模型TT vs.(CT+CC)下,MTHFR C677T SNP与SVT(OR=2.27,95%CI=1.77~2.90,P0.001)及PVT亚组(OR=2.23,95%CI=1.57~3.17,P0.001)的关联性有统计学意义;在等位基因模型T vs.C下,MTHFR C677T SNP与SVT(OR=1.84,95%CI=1.33~2.55,P0.001)及MVT亚组(OR=1.64,95%CI=1.14~2.36,P=0.008)的关联性有统计学意义。结论:MTHFR C677T SNP与SVT易感性之间有关联性,携有TT基因型和T等位基因的人群罹患SVT的风险可能增加。     

乳腺癌发病风险及侵袭特性与白细胞介素-8和CXCR2基因多态性的关系

目的 探讨细胞因子白细胞介素( 1L)-8(- 251)位点及其受体CXCR2(±1208)位点多态性与乳腺癌发病风险及侵袭特性的关系.方法 采用等位基因特异-聚合酶链反应(AS-PCR)分析方法检测228名乳腺癌患者和100例健康对照者的IL-8(- 251)位点及其受体CXCR2(±1208)位点多态性分布,并进行统计学分析.结果 IL-8(- 251)位点TA型和AA型以及CXCR2(± 1208) TT型是乳腺癌的高危基因型[比值比(OR)=1.57,95％可信区间(CI)=1.08～2.32;OR =2.68,95％ CI=1.26 ～2.99;0R=2.02,95％CI=1.08～3.62],在两组间表达频率的差异有统计学意义(P＜0.05).携带1个及以上高危基因型增加患乳腺癌的风险.分层分析表明携带IL-8(-251)等位基因A和CXCR2(± 1208)等位基因T增加乳腺癌的侵袭特性,其分布频率在肿瘤的高组织学分级(OR=1.95,P＜0.01;OR=1.52,P＜0.05)和淋巴结转移阳性(OR=1.65,P＜0.05;0R=1.66,P＜0.01)中差异有统计学意义.另外,IL-8(-251)A等位基因与ER( -)乳腺癌显著相关( OR=1.65,P＜0.05).结论 IL-8和CXCR2的基因多态性可能与女性乳腺癌的发生发展关系密切,可作为乳腺癌早期基因诊断的指标.     

髋骨性关节炎滑膜组织中钙结合蛋白（S100A12）的表达及意义

目的观察髋骨性关节炎患者血液及滑膜组织中钙结合蛋白S100A12的表达,以探讨它在髋骨性关节炎致病过程中的作用,为揭示髋关节骨性关节炎发病机制提供理论和实验依据。方法收集行髋关节置换的27例髋骨性关节炎患者(OA组)与35例股骨颈骨折患者(对照组);对OA组患者的髋关节X片分析,根据Kellgren-Lawrence(K-L)分级标准对患者进行分级;对两组患者静脉采血,术中取滑膜组织,采用ELISA法定量和免疫组化技术检测S100A12的表达,并采用IPP软件半定量分析免疫组化S100A12的表达量。结果 OA组的血清中S100A12水平(94.20±49.85)ng/m L显著高于对照组含量(25.32±16.87)ng/m L,有统计学差异(P0.01);滑膜组织OA组与对照组S100A12含量分别为(3.73±1.97)ng/mg总蛋白和(1.67±1.21)ng/mg总蛋白(P0.01),差异有统计学意义;免疫组化分析S100A12阳性反应在滑膜微血管内中性粒细胞胞浆中,以及部分滑膜细胞的胞浆内。OA组平均光密度MOD(0.21±0.06)较对照组MOD(0.13±0.05)有显著性差异(P0.01);OA组K-L分级4级患者的血清中S100A12水平(104.81±46.68)ng/m L显著高于3级血清含量(86.85±52.46)ng/m L,有统计学差异(P0.01)。4级患者滑膜组织含量(4.62±1.95)ng/mg总蛋白显著高于3级患者水平(3.13±1.82)ng/mg总蛋白(P0.01)。结论 S100A12在髋骨关节炎患者的滑膜组织表达量显著增加;S100A12的表达与患者髋骨关节炎严重程度相关;S100A12的检测有助于骨性关节炎的诊断,为临床治疗提供参考。     

白细胞介素-28B基因多态性与新疆维吾尔族HCV感染的易感性研究?

目的探讨白细胞介素-28B(IL-28B)基因的多态性与新疆维吾尔族慢性丙型肝炎感染易感性的关联。方法选取180例新疆维吾尔族慢性丙型肝炎患者作为HCV组,155例维族健康体检者作为健康对照组,通过PCR产物测序法检测两组受试者IL-28B rs8099917基因型和等位基因分布频率,对两组基因型和等位基因差异进行分析;同时在HCV组中,对不同IL-28B基因型人群的HCV RNA载量、肝功能和血脂水平等进行分析。结果 rs8099917在HCV组和健康对照组中TT和TG/GG基因型频率在新疆维族HCV组与健康对照组中差异具有统计学意义(χ2=11.627、P=0.001,OR=1.363,95%CI:1.107~1.591);两组间G等位基因率差异显著,HCV组中占13.3%,健康对照组7.0%(χ2=7.011、P=0.008,OR=0.658,95%CI:0.512~0.905)。患者HCV RNA和肝功能血脂差异与IL-28B基因多态性中无关。结论新疆维吾尔族人群中HCV的易感性IL-28B rs8099917基因多态性有关联,rs8099917中等位基因G是新疆维族HCV患者的易感基因。     

酪氨酸蛋白激酶-2 rs2230724基因多态性与结直肠癌风险相关性研究

目的探讨酪氨酸蛋白激酶-2（JAK2）基因rs2230724多态性与结直肠癌风险的相关性。 方法采用多聚酶链式反应-限制性内切酶片段长度多态性（PCR-RFLP）方法分析110例结直肠癌患者（病例组）和150例非肿瘤患者（对照组）JAK2 rs2230724基因的多态性,并对该多态性与结直肠癌风险的相关性进行评估。采用SPSS 26.0软件进行分析。采用拟合优度χ²检验进行Hardy-Weinberg平衡的检测。两组间的一般资料、基因型和等位基因的频率分布的比较采用Student’s t检验和Pearson χ²检验。采用Logistic线性回归（需要进行校正）分析JAK2 rs2230724基因多态性和结直肠癌风险的相关性,相对危险度用优势比（OR）和95%可信区间（CI）估计。以P<0.05为有统计学意义。 结果病例组A等位基因频率明显高于对照组,A等位基因突变增加50%结直肠癌发病风险（P=0.025,OR=1.50,95%CI=1.05-2.14）。与野生基因型（GG）相比,变异基因型（AG+AA）增加79%结直肠癌发病风险（P=0.043,校正OR=1.79,95%CI=1.02-3.15）。其中,突变纯合子（AA）基因型的携带者结直肠癌的风险增加129%（P=0.034,OR=2.29,95%CI=1.06-4.93）,差异有统计学意义。但是,在添加了校正因素后,差异无统计学意义（P=0.052,校正OR=2.29,95%CI=0.99-5.26）。而且,在分层分析中,在高年龄组（年龄>56）、非吸烟受试者和城市居住者中,该多态性增加结直肠癌风险（P<0.05）。 结论在江苏汉族人群中JAK2基因rs2230724多态性与增加结直肠癌风险相关。     

人异黏蛋白在乙肝相关性肝癌组织中的表达及其临床病理意义

目的探索人异黏蛋白(metaherin,MTDH)m RNA及其蛋白在乙肝相关性肝癌组织及其癌旁组织中的表达差异,并探索其临床意义。方法回顾性收集2012年7月至2013年10月期间湖北医药学院附属太和医院保存的乙肝相关性肝癌组织及其癌旁组织标本,采用荧光定量PCR法和Western blot法分别检测乙肝相关性肝癌组织及其癌旁组织中MTDH m RNA及其蛋白的表达水平(均为10例),并采用免疫组化染色方法检测72例乙肝相关性肝癌组织中MTDH蛋白的表达情况,进一步分析乙肝相关性肝癌组织中MTDH蛋白表达与患者临床病理特征的关系。结果乙肝相关性肝癌组织MTDH m RNA(8.50±0.84比4.55±0.81,t=10.797,P=0.000)及其蛋白(0.65±0.24比0.25±0.16,t=6.375,P=0.013)的表达水平均高于癌旁组织。在72例乙肝相关性肝癌组织中,42例MTDH蛋白呈阳性表达(58.3%),30例呈阴性表达(41.7%)。多因素logistic回归模型结果显示,在乙肝性相关性肝癌患者中,Edmondson分级为Ⅲ级(OR=4.783,95%CI:2.663~11.918,P=0.020)、有微血管浸润(OR=37.790,95%CI:2.227~99.434,P=0.005)及有淋巴结转移(OR=7.332,95%CI:3.325~30.669,P=0.023)均与MTDH蛋白的阳性表达有关。结论在乙肝相关性肝癌组织中存在MTDH m RNA及其蛋白的高表达,且MTDH蛋白的阳性表达与患者较差的预后相关。     

CD31基因型及血清水平与肝细胞肝癌的相关性研究

目的 研究CD31基因单核苷酸多态性及血清水平与肝癌的相关性.方法 选取190例肝癌患者和210例健康对照者为研究对象,应用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)技术对CD31基因Leu125Val、Asn563Ser和Gly670Arg单核苷酸多态性进行基因分型,同时采用酶联免疫吸附试验检测血清CD31水平.结果 肝癌组和对照组的CD31基因Asn563Ser和Gly670Arg多态性比较,差异无统计学意义(x2=0.491,P＞0.05),而CD31基因Leu125Val多态性比较差异有统计学意义(x2=10.988,P＜0.05),等位基因频率的相对风险分析发现,Val等位基因携带者患肝癌的风险是Leu等位基因的1.583倍(OR=1.583,95％ CI,1.197 ～2.093,P=0.001);携带Val等位基因的肝癌患者血清CD31水平显著高于不携带者(x2=10.408,P＜0.05).联合基因型分析显示,CD31基因Leu125Val、Asn563Ser和Gly670Arg单核苷酸多态性存在着强烈的连锁不平衡,与对照组比较,Val-Ser-Arg单倍型携带者显著增加肝癌的发病风险(OR=1.496,95％ CI:1.095 ～2.046,P=0.011). 结论 CD31基因Leu125Va1多态性和Val-Ser-Arg单倍型与肝癌的发病具有相关性,其中Val等位基因可能是肝癌的遗传易感基因,携带Val等位基因的个体可能通过促进CD31的高度表达进而增加肝癌的发病风险.     

大承气汤对肠源性内毒素血症大鼠组织PLA_2、SOD活性变化的影响

采用静注５－ＨＴ、Ｐｂ－Ａｃｅｔ同时口灌ＬＰＳ对大鼠进行肠源性内毒素血症造模。造模后三小时，测血、组织ＰＬＡ２和ＳＯＤ活性。结果表明，模型组大鼠血清、肺、肝、肾组织匀浆的ＦＬＡ２活性明显高于正常组，而大承气汤治疗组则与正常组无异；相反模型组肺、肝、肾组织匀浆ＳＵＤ活性，则较正常组明显下降，而大承气汤治疗组则与正常组无异，说明大承气汤在肠源性内毒素血症病理形成过程中能明显抑制ＰＬＡ２活性的升高，有益于减轻组织的损害；此外，又可阻止ＳＯＤ活力的下降，从而增强对过量产生的Ｏ２的消除能力。     

IL-2 perfusion to the liver augments the hepatic extraction rate of accompanying anticancer drugs

A pilot study we conducted on hepatic infusion chemotherapy combined with interleukin-2 (IL-2) for metastatic liver malignancies revealed very encouraging results indicating that this treatment modality is more effective than either of the anticancer drugs used alone. To clarify the mechanisms underlying the synergism of these modalities, the pharmacokinetics of anticancer drugs were examined in a rat model. Adult rats were given 5-fluorouracil (5-FU) or mitomycin C (MMC) combined with various doses of IL-2 up to 7500 JRU/kg per minute for the measurement of hepatic extraction rates (HER). The HER of 5-FU was significantly increased (P<0.01) in combination with IL-2 in a dose-dependent fashion while that of MMC also showed a tendency to increase. Thus, it is conceivable that the increase of vascular permeability caused by IL-2 results in augmentation of the HER of associated anticancer drugs. This effect may improve the delivery of anticancer drugs to the liver and alleviate general toxicity by reducing the amount of circulating anticancer agents.     

PR-AⅡ、PGI_2-TXA_2在ESWL后高血压中的作用

通过对60例患者血液标本的检测,发现体外震波碎石术(ESWL)后出现高血压的患者其血浆肾素(PR)—血管肾张素Ⅱ(AⅡ)系统活性及血栓素A_2(TXA_2)浓度明显高于ESWL后血压正常者,而血浆前列腺素(PGI_2)浓度则正好相反。认为PGI_2合成减少和TXA_2合成相对增多,PGI_2/TXA_2比率下降,导致PR—AⅡ系统活性升高,血管壁对PR—AⅡ系统的敏感性增加,是ESWL后患者出现高血压的主要原因。     

Effects of interleukin-2 on hypothalamic and plasma luteinizing hormone-releasing hormone levels in rats

To investigate the effects of interleukin-2 (IL-2) on the hy-pothalamic and plasma luteinizing hormone-releasing hormone(LHRH) levels and serum testosterone (T) level in rats. The hor-mones were measured by radioimmunoassay. Two different dosesof IL-2 (1000 U and 2000 U) were injected. The results showedthat IL-2 slightly decreased the hypothalamic and plasma LHRHlevels, but the differences with the controls were not significant.The administration of 2000 U IL-2 significantly decreased the serumT level. Results suggest that IL-2 may play an inhibitory role onhypothalamic LHRH secretion and decrease serum T level in Rats.(Chin J Androl 2001; 2: 85-6, 91)     

急性胰腺炎合并肝损伤时IL-6、氧自由基变化及IL-2、川芎嗪干预的实验研究

目的：探讨IL－6、氧自由基在急性胰腺炎（acute pancreatitis，AP）合并肝损伤中的作用，及重组人白介素－2（IL－2）、川芎嗪的治疗价值。方法：SD大鼠112只，随机分为14只，每组8只，5％牛磺胆酸钠逆行胰胆管内注射诱发大鼠AP动物模型，检测血浆IL－6、SOD、MDA、ALT、AST、LDH、LIP、AMY，并观察肝、胰病理变化。结果；①AP组血浆AMY、LIP、ALT、AST、LDH明显升高（P＜0．05或0．01），镜下可见胰腺水肿、炎细胞浸润、坏死1肝脏肝窦充血、细胞浊肝及坏死，且损伤程度随时限延长而加重；②AP各组血浆IL－6明显升同（P＜0．01）；③AP各组MDA明显高（P＜0．01）、SOD明显降低（P＜0．01）。④IL－2治疗组、川芎嗪治疗组有IL－2、川芎嗪联合且与NS组比较血浆IL－6、MDA水平明显下降（P＜0．05），SOD明显升高（P＜0．05），胰、肝病理损害程度减轻，并且AMY、LIP、ALT、AST、LDH均明显降低（P＜0．05），平均存活时间明显延长（P＜0．05）；联合应用组降低IL－6、MDSA水平和减轻胰腺坏死优于单药组。结论：①IL－6、氧自由基在急性胰腺炎合并肝损伤程度和明显升同，起损伤作用，而SOD明显降低，其保护作用减弱。检测血浆IL－6、MDA、SOD可作为判断AP合并肝脏损伤程度和预后的指标；②大鼠急性胰腺合并肝损伤过程中应用IL－2、川芎嗪显示出良好的效果，联合应用于亿于这两药的单独应用。     

SGLT2抑制剂对2型糖尿病患者骨骼的影响

钠葡萄糖共转运体2(sodium-glucose cotransporter 2,SGLT2)抑制剂是一种新型降糖药物,其作用机理是通过抑制肾小管对尿糖的重吸收,以增加尿糖排泄降低血糖。近期来自国外的多个临床药物试验发现SGLT2抑制剂可能对2型糖尿病患者的骨代谢、骨密度以及骨折率产生影响。本文将通过复习国内外相关研究,尝试综述SGLT2抑制剂对2型糖尿病患者骨骼的影响。     

Retrosigmoid Craniotomy for Auditory Brainstem Implantation in Adult Patients with Neurofibromatosis Type 2

Objective To report our technique and experience using a retrosigmoid craniotomy approach for auditory brainstem implantation (ABI) placement in adult neurofibromatosis type 2 (NF2) patients. Design Retrospective case series. Setting Single-center study, Boston, Massachusetts, United States. Participants All NF2 patients who underwent evaluation at Massachusetts Eye and Ear Infirmary and surgery at Massachusetts General Hospital from 2009 to 2013 were reviewed. Six cases of retrosigmoid craniotomy for ABI surgery in five adult NF2 patients were identified. The clinical history, operative course, and outcomes in these patients were reviewed. Main Outcome Measures Postoperative complications and audiological outcomes. Results Indications for ABI surgery were profound hearing loss associated with growth or treatment of bilateral vestibular schwannomas. In all cases, a retrosigmoid craniotomy was performed for tumor resection and ABI placement without complication. Electrode placement was confirmed intraoperatively using electrical-evoked auditory brainstem responses. The ABI was activated in the awake patient 4 to 6 weeks postoperatively. Audiological testing was used to evaluate sound detection and speech perception with the ABI. There were no cases of cerebrospinal fluid leak. Conclusion Retrosigmoid craniotomy is a safe and effective means to provide access to the cochlear nucleus for ABI placement following tumor resection in the adult NF2 patient. Preliminary data indicate that this approach has few complications while offering benefits for hearing. The retrosigmoid craniotomy should be considered a reasonable alternative to the traditional translabyrinthine approach for placement of the ABI in deaf patients who are not candidates for the cochlear implant.     

Changes of serum advanced glycation end products (AGEs), matrix metalloprotein-2 (MMP-2), and urinary microalbuminuria (mALB) in diabetic nephropathy and their predictive value for heart failure

BackgroundDiabetic nephropathy is a common complication in diabetic patients, with a high rate of disability and mortality. This study aims to explore the changes in serum advanced glycation end products (AGEs), matrix metalloprotein-2 (MMP-2), and urinary microalbuminuria (mALB) in diabetic nephropathy and their predictive value for heart failure.MethodsThe 134 patients with diabetic nephropathy treated in our hospital from January 2014 to December 2017 were enrolled and divided into two groups resulting in 64 cases in an observation group with heart failure, and 70 cases without heart failure in a control group. In addition, 80 patients with simple diabetes who were treated during the same period were selected as the simple diabetes group. Levels of AGEs, MMP-2, and mALB between the groups were compared, risk factors affecting diabetic nephropathy patients with heart failure were analyzed, and an ROC curve was drawn to evaluate the predictive value of AGEs, MMP-2, and mALB for heart failureResultsThe levels of AGEs and mALB in the diabetic nephropathy group were significantly higher than those in the simple diabetes group, and the levels of MMP-2 were significantly lower than those in the simple diabetes group (P<0.05). The levels of AGEs and mALB in the observation group were significantly higher than those in the control group, and the levels of MMP-2 were significantly lower than that in the control group (P<0.05). Smoking history hypertension history, blood creatinine (abnormal increase), blood uric acid (abnormal increase), AGEs (abnormal increase), MMP-2 (abnormal decrease), and mALB (abnormal increase) were independent risk factors affecting diabetic nephropathy patients with heart failure. The area under the ROC curve of AGEs, MMP-2, mALB, and their combined detection were: 0.821, 0.909, 0.897, and 0.991, respectively, showing the area under the curve of combined detection to be the largest.ConclusionsAGEs, MMP-2, and mALB have high predictive value for heart failure in patients with diabetic nephropathy. Their sensitivity and specificity are high, indicating they may hold considerable clinical value.     

The Role of Oxidative Stress in Aseptic Loosening of Total Hip Arthroplasties

This study investigated the hypothesis that wear particle-induced oxidative stress initiates osteolysis after total hip arthroplasty (THA). Patient radiographs were scored for osteolysis and periprosthetic tissues were immunostained and imaged to quantify polyethylene wear, inflammation, and five osteoinflammatory and oxidative stress-responsive factors. These included high mobility group protein-B1 (HMGB1), cyclooxygenase-2 (COX2), inducible nitric oxide synthase (iNOS), 4-hydroxynonenal (4-HNE), and nitrotyrosine (NT). The results show wear debris correlated with inflammation, 4-HNE, NT and HMGB1, whereas inflammation only correlated with NT and HMGB1. Similar to wear debris and inflammation, osteolysis correlated with HMGB1. Additionally, osteolysis correlated with COX2 and 4-HNE, but not iNOS or NT. Understanding the involvement of oxidative stress in wear-induced osteolysis will help identify diagnostic biomarkers and therapeutic targets to prevent osteolysis after THA.     

成纤维细胞激活基因的调控及改善皮肤老化的研究

目的 通过研究雌二醇、维生素E、维生素C对体外培养的人皮肤成纤维细胞基质金属蛋白酶-1(MMP-1) mRNA、透明质酸合成酶-2(HAS-2) mRNA转录水平的影响,探讨不同药物改善皮肤老化的可能机制.方法 将不同浓度的雌二醇、维生素E、维生素C分别加入体外培养的人皮肤成纤维细胞,逆转录-聚合酶链反应(RT-PCR)检测不同物质对成纤维细胞中HAS-2 mRNA、MMP-1 mRNA表达水平的影响.结果 雌二醇、维生素C对MMP 1 mRNA表达的影响:高剂量组、低剂量组与对照组的差异有统计学意义(P＜0.05),低剂量组与高剂量组差异无统计学意义(P＞0.05).维生素E、维生素C对HAS-2 mRNA表达的影响:高剂量组、低剂量组与对照组的差异有统计学意义(P＜0.05),低剂量组与高剂量组差异无统计学意义(P＞0.05).结论 雌二醇、维生素C可以下调MMP-1基因的转录水平,减少后者对皮肤胶原的降解;维生素E、维生素C可以上调HAS-2基因的转录水平,可能增加透明质酸的合成,从而改善皮肤老化.