简介:摘要目的探讨1例Bweak亚型个体的分子机制。方法选取2016年12月5日于浙江省血液中心献血的1例受试者为研究对象。利用血清学方法鉴定受试者的ABO表型,用体外酶活性试验测定其血清中B糖基转移酶(GTB)的活性。用PCR扩增ABO基因第5 ~ 7外显子及侧翼序列并确定其基因型,采用T-A克隆技术分离单倍体并进行测序验证。用ProtParam和PSIPRED软件分析蛋白的一级理化性质和二级结构。用PolyPhen-2、SIFT、PROVEAN三种软件分析错义变异对蛋白的作用效应。结果受试者血清学检测为Bweak亚型,血清中存在抗B抗体。体外酶活性试验显示其GTB活性显著降低。单倍体克隆测序分析发现B等位基因上存在c.398T>C错义变异,为一个新的B等位基因,可导致GTB第133位的苯丙氨酸替换为丝氨酸(p.Phe133Ser)。生物信息学分析提示上述替换对蛋白的一级和二级结构影响不明显,但变异蛋白的热力学能量增加6.07 kcal/mol,严重降低了热稳定性,生物信息学预测该变异对蛋白功能有害。结论新等位基因ABO*B.01-398C是引起Bweak亚型抗原弱表达的机制,生物信息学分析有助于评估其结构和功能的变化。
简介:目的探讨不同模拟体液对HA涂层体外生物学行为的影响.方法采用等离子体喷涂法,在碳/碳复合材料表面制备HA涂层,并对涂层进行了热处理.利用X射线衍射仪(X-raydiffraction)、扫描电子显微镜(Scanningelectronmicroscopy)等检测手段,分析该涂层的物相和形貌,观察HA涂层在模拟体液中的影响.结果XRD检测结果表明,在模拟体液浸泡过程中,涂层的主要组成相的相对含量和结晶度不断发生变化.由SEM分析结果可知,在浸泡过程中,内送粉方式下制得的HA涂层的表面沉积物呈现近似网状的结构.同时,在Ringer溶液中,可以观察到HA涂层溶解痕迹.结论通过适当的热处理可以恢复HA的结构完整性,同时提高涂层的结晶度.
简介:摘要目的探讨血清中ApoAⅠ与HDL-C以及ApoB与LDL-C之间的的相关性。方法选取我院收治的34例高脂血症患者作为为观察组,以同期体检的健康成人35例作为对照组。分别检测甘油三酯、总胆固醇、高密度脂蛋白胆固醇和低密度脂蛋白胆固醇、载脂蛋白AⅠ与载脂蛋白B,然后通过统计学方法比较指标间的相关性。结果对照组ApoAⅠ与HDL-C以及ApoB与LDL-C之间均呈中等相关性,实验组ApoAⅠ与HDL-C呈中等相关性,ApoB与LDL-C之间存在显著相关性。结论载脂蛋白AⅠ与高密度脂蛋白具有相关性,载脂蛋白B与低密度脂蛋白同样具有相关性。
简介:摘要目的:研究microRNA-135a/b(miR-135a/b)对葡萄膜黑色素瘤(UM)细胞迁移能力的调控作用及其机制。方法:实验研究。采用定量RT-PCR检测UM标本和癌旁组织中miR-135a/b的表达水平。将miRNA模拟物转染入UM细胞(M23和SP6.5)过表达miR-135a/b,转染无义序列作为对照组(NC)。利用小RNA干扰技术和慢病毒过表达载体感染技术分别下调和上调细胞中SIRT1蛋白表达水平,分别以无义小干扰RNA(siNC)和插入无义序列的慢病毒载体(Lv-NC)作为阴性对照。采用划痕实验和Transwell实验检测细胞的迁移能力。双萤光素酶报告实验用于鉴定miR-135a/b的靶基因。Western blot检测SIRT1蛋白的表达水平。采用独立样本t检验进行数据分析。结果:定量RT-PCR结果显示miR-135a/b在UM组织较癌旁组织的表达水平明显下调(miR-135a:t=6.38,P=0.003;miR-135b:t=23.26,P<0.001)。划痕实验和Transwell实验结果显示,与NC组相比,miR-135a/b过表达M23和SP6.5细胞迁移距离减小(miR-135a:t=36.01、8.98,均P<0.01;miR-135b:t=27.53、10.51,均P<0.01)且迁移细胞数量减少(miR-135a:t=7.04、7.02,均P<0.01;miR-135b:t=5.01、7.32,均P<0.01)。双萤光素酶实验证实,miR-135a/b能够明显抑制SIRT1野生组萤光素酶的荧光值(miR-135a:t=2.88,P=0.028;miR-135b:t=4.99,P=0.003);Western blot结果表明,与NC组相比,过表达miR-135a/b的M23和SP6.5细胞中SIRT1的蛋白水平下调(miR-135a:t=9.93、4.13,均P<0.01;miR-135b:t=4.66、6.20,均P<0.01)。siSIRT1转染后划痕实验和Transwell实验结果显示,与siRNC组相比,M23和SP6.5细胞中下调SIRT1蛋白水平后细胞的迁移距离减小(siSIRT1-I:t=13.88、11.78,均P<0.01;siSIRT1-II:t=31.20、6.27,均P<0.01)且迁移细胞数量减少(siSIRT1-I:t=7.57、4.66,均P<0.01;siSIRT1-II:t=5.58、3.25,均P<0.05)。M23和SP6.5细胞中上调SIRT1蛋白水平同时过表达miR-135a/b,Transwell实验结果显示,细胞的迁移数量较仅过表达miR-135a/b升高(miR-135a+Lv-SIRT1:t=4.10、2.75,均P<0.05;miR-135b+Lv-SIRT1:t=2.99、2.49,均P<0.05)。结论:miR-135a/b在UM中明显下调且通过靶向结合SIRT1 mRNA 3'非翻译区抑制UM细胞的迁移,提示miR-135a/b-SIRT1信号轴在UM发展中发挥重要作用。
简介:摘要目的探讨肝硬化合并肝癌及单纯肝癌患者不同child分级时补体C3、C4的表达意义。方法选取肝癌患者121例,健康对照组37例,均测定补体C3、C4含量。将肝癌患者分为肝硬化合并肝癌组及单纯肝癌组,并根据Child评分分级分组,比较两组间C3、C4水平的差异。结果1肝癌两组中随着Child分级由A级至C级变化血清补体C3水平逐渐降低,而补体C4水平则逐渐升高。2组间比较A级、B级时单纯肝癌组补体C3、C4水平均高于肝硬化合并肝癌组。单纯肝癌组与对照组比较差异同样有显著性。结论血清补体C3、C4与肝功能损伤严重程度相关,结合Child分级可更好地反映肝癌及肝硬化合并肝癌时肝脏储备功能及体液免疫水平,对临床诊治有重要意义。
简介:AbstractBackground:Aberrant activation of the complement system plays an important role in the pathogenesis and development of immunoglobulin A nephropathy (IgAN). The relationship between serum complement and the clinical-histopathological features and outcomes of IgAN is controversial. This retrospective study aimed to examine the relationship between the complement 3/4 (C3/C4) ratio and the clinicopathologic changes and prognosis of patients with IgAN.Methods:A total of 397 patients with primary IgAN from January 2007 to December 2012 at the Chinese People’s Liberation Army General Hospital were included in this study. The correlation test and Chi-square test or one-way analysis of variance test were performed to evaluate the relationship between the C3/C4 ratio and other clinical-pathological factors. Propensity score matching and a multivariate Cox regression model were used to calculate the risk factors of renal outcome.Results:The median follow-up period was 75 months. During the follow-up period, 62 patients (15.6%) developed into the end-stage renal disease (ESRD). The C3/C4 ratio at baseline was associated with the level of serum creatinine (SCr), 24 h urinary protein excretion (24 h Upre), global glomerular sclerosis, and tubulointerstitial lesion. The level of SCr and 24 h Upre and the degree of chronic kidney injury were statistically different among groups defined by different C3/C4 ratio levels. The survival rates of patients among groups with different C3/C4 ratio levels were different. After propensity score matching, eighty-eight pairs of patients were successfully matched, and the C3/C4 ratio was an influencing factor for the patients’ outcome (hazard ratio 0.587, 95% confidence interval 0.329-0.880). Patients with a C3/C4 ratio <3.6 had a poorer outcome compared with the others (P = 0.002).Conclusions:IgAN patients with decreased C3/C4 ratio displayed significantly more severe clinical symptoms and chronic renal injury than patients with higher ratios. A low C3/C4 ratio could be a risk factor for patients developing to ESRD.
简介:目的:观察小鼠不同程度缺氧适应对缺血缺氧脑即早基因c-fos和c-jun基因表达的影响。方法:采用链霉素亲生物素-过氧化酶(简称S-P)免疫组化技术。采用两种不同程度的缺氧预处理:①小鼠第一次缺氧开始到喘呼吸出现后,行第二次缺氧,定为B1组(此时瓶内的氧浓度为15%);②小鼠第一次缺氧开始到瓶内的氧浓度降低为10%后,行第二次缺氧,定为B2组。结果:B2组的低氧存活时间明显长于B1组;缺血缺氧后30minc-fos和c-jun基因阳性细胞呈低密度分布,1hc-fos基因表达下降,12h则基本消失,阳性细胞呈散在分布。c-jun基因的表达高峰在缺血缺氧3h、12h时,c-jun基因阳性细胞仍呈低密度分布;缺氧适应使缺血缺氧脑增加的c-fos基因的阳性细胞数减少,而使缺血缺氧脑增加的c-jun基因的阳性细胞进一步增加,B1组和B2组缺血缺氧脑基因表达的影响无差异,结论:缺血缺氧可诱发中枢神经系统c-fos、c-jun基因表达.且有时间依赖性;缺氧适应可抑制缺血缺氧脑c-fos基因的表达,增强缺血缺氧脑c-jun基因的表达。
简介:摘要目的探讨肝硬化并自发性细菌性腹膜炎(SBP)的临床观察及护理方法。方法回顾性分析135例肝硬化并SBP的临床观察和护理措施。结果111例(82.2%)有不同程度发热,腹部症状表现腹胀、腹肌紧张、腹痛、腹泻、腹部压痛或反跳痛等;外周血白细胞数≥10.0×109/L者29例(21.5%),中性粒细胞>70%者86例(63.0%);腹水白细胞数>0.5×109/L者61例(45.2%),多核细胞(PMN)>50%者78例(57.8%);118例腹水细菌培养,阳性30例,阳性率25.4%。135例患者通过综合治疗及护理配合,治愈40例(29.63%),好转48例(35.56%),无效、恶化或自动出院47例(34.81%),其中死亡15例。结论肝硬化合并SBP的临床症状不典型,应加强病情观察及实施有效的护理措施,及时有效应用抗生素治疗,以提高患者的生存率。
简介:摘要目的了解一起洗浴中心W135群脑膜炎奈瑟菌感染疫情,为有效防控流行性脑脊髓膜炎提供依据。方法采用现场流行病学方法对杭州市某洗浴中心1例W135群脑膜炎奈瑟菌感染患者和105名密切接触者进行调查,并采集咽拭子进行细菌分离鉴定。结果通过流行病学调查、临床症状和实验室检测结果,确诊患者为W135群流脑病例。在接受采样的103名密切接触者中,9人咽拭子样本分离到脑膜炎奈瑟菌,带菌率8.74%,其中1人鉴定为B群脑膜炎奈瑟菌感染。对密切接触者随访未出现后续病例。结论杭州市首次确诊W135群流脑病例,密切接触者中分离出B群脑膜炎奈瑟菌,警示该地区流行性脑脊髓膜炎流行菌群已发生变化。
简介:摘要目的探讨低水平丙氨酸转氨酶(ALT)慢性HBV感染者肝脏病理发生明显组织学改变的危险因素。方法回顾性分析2017年7月至2019年7月于宁波大学医学院附属医院及浙江大学医学院附属第一医院住院的135例血清ALT水平低于2倍正常值上限(ULN)慢性HBV感染者的临床资料,对所有研究对象的肝脏病理结果进行统计,采用Logistic回归分析影响患者发生明显肝脏炎症(G≥2)或纤维化(S≥2)的危险因素。结果52例(52/135,38.5%)患者的肝组织G≥2或S≥2。单因素分析显示,年龄、HBV家族史、ALT 1~<2×ULN、天冬氨酸转氨酶(AST)≥1×ULN、血小板计数(PLT)降低、凝血酶原时间(PT)延长是低水平ALT慢性HBV感染者肝脏病理发生G≥2或S≥2的危险因素(P<0.05或<0.01);多因素Logistic回归分析显示,年龄(OR=1.052,95%CI 1.007~1.100)、HBV家族史(OR=5.448,95%CI 2.191~13.548)和AST(OR=1.042,95%CI 1.005~1.081)是低水平ALT慢性HBV感染者肝脏病理发生G≥2或S≥2的独立危险因素(P<0.05或<0.01)。结论对于ALT<2×ULN的慢性HBV感染者,年龄、HBV家族史和AST水平可作为判断肝脏病理组织严重程度和接受抗病毒治疗的依据。
简介:AbstractObjectives:To investigate the prevalence of ACADM pathogenic variants, c.985A>G and c.199T>C, for medium chain acyl CoA dehydrogenase deficiency (MCADD) in a healthy population in the southern region of Brazil.Methods:This was an observational cross-sectional study with a convenience sampling strategy. The participants were recruited from the blood bank of the Hospital de Clínicas of Porto Alegre, Brazil. A total of 1000 healthy individuals from the state of Rio Grande do Sul were included. Genotyping for the c.199T>C and c.985A>G variants was performed using real-time polymerase chain reaction (PCR) and the PCR-restriction fragment length polymorphism (RFLP) technique, respectively. Individuals considered heterozygous for c.985A>G were subjected to additional acylcarnitine profile analysis using tandem mass spectrometry. Carrier frequency was obtained by calculating the ratio of heterozygous individuals to the total number of individuals analyzed and reported with a 95% confidence interval. Allele and genotype frequencies were calculated based on the Hardy-Weinberg equilibrium.Results:The c.985A>G variant was detected as heterozygotes in three individuals (frequency of the heterozygous genotype = 1:333, allele frequency= 0.0015, minimum frequency of MCADD= 1:444,444) whose acylcarnitine profiles were within normal limits. The c.199T>C variant was not identified.Conclusions:Considering the small sample size and associated allelic heterogeneity with MCADD, these findings are believed to denote the rarity or underdiagnosis of MCADD in southern Brazil. This study provides evidence for the need for further investigation to ascertain the contribution of these diseases to child morbidity and mortality in the country.
简介:摘要目的慢性牙周炎(chronicperiodontitis,CP)是我国成年人丧失牙齿的主要原因。C-反应蛋白(C-reactiveprotein,CRP)作为一种炎症反应标志物,在牙周炎的发生发展过程中发挥重要作用。方法采集牙周炎患者和正常对照者的血清标本,检测CRP浓度。结果我们的结果显示,牙周炎患者外周血液中CRP较正常对照组显著增高,其差异有统计学意义。进一步分析发现,CRP的水平高低与牙周炎患者病情严重程度有关,病情越严重,CRP的浓度越高。结论牙周炎患者外周血液中存在高水平CRP,且其水平高低与病情轻重关系密切,因此,监测牙周炎患者外周血液CRP水平,可为判断牙周炎患者病情及预后提供新的指标。
简介:美国芝加哥大学的研究人员通过实验发现,虾等软壳类食物含有浓度较高的-五钾砷化合物。这种物质食入体内,本身对人体并无毒害作用,但是在服用维