丝氨酸蛋白酶Omi/HtrA2表达增加促进心肌衰老的作用

目的 观察线粒体促凋亡蛋白Omi/HtrA2表达增加对心肌衰老的影响。方法 构建心肌特异性过表达Omi/HtrA2小鼠模型,通过Western blotting法检测衰老标志物p53、p21、p16表达水平;分析Omi/HtrA2与衰老标志物表达的相关性;构建Omi/HtrA2稳转H9c2细胞系,通过Western blotting法检测Omi/HtrA2表达增加后衰老指标p53、p21、p16的改变;通过β-半乳糖苷酶(β-gal)染色比较β-半乳糖苷酶染色阳性衰老细胞的改变;通过Omi/HtrA2特异性抑制剂UCF101抑制Omi/HtrA2功能,检测抑制Omi/HtrA2活性后衰老标志物的表达水平及阳性衰老细胞变化。结果 (1)与对照组相比,心肌特异性过表达Omi/HtrA2小鼠心肌组织中,Omi/HtrA2表达量显著增加(P<0.01);过表达Omi/HtrA2心肌组织衰老标志物p53、p21、p16增加(P<0.01);(2)在心肌组织中Omi/HtrA2表达量与衰老标志物p53、p21、p16呈正相关(P<0.05);(3)与H9c2细胞(control组)相比,Omi/HtrA2稳转H9c2细胞(Omi组)衰老标志物p53、p21、p16表达增加(P<0.05);β-半乳糖苷酶染色结果显示,Omi组衰老细胞增加;与Omi组相比,Omi/HtrA2特异性抑制剂UCF101处理组(Omi+UCF101组)衰老标志物p53、p21、p16表达降低(P<0.05);β-半乳糖苷酶染色阳性细胞减少。结论 Omi/HtrA2的表达与衰老标志物呈正相关,表达增加的Omi/HtrA2促进心肌衰老。     

PDX-1蛋白对棕榈酸诱导的大鼠胰岛凋亡的保护作用

目的探讨PDX-1蛋白对棕榈酸诱导的大鼠胰岛凋亡的保护作用。方法PDX-1基因克隆及表达质粒的构建,PDX-1蛋白的表达、纯化和鉴定,PDX-1蛋白保护棕榈酸引起的胰岛细胞凋亡的研究。结果PDX-1蛋白可以延缓胰岛细胞的自然凋亡过程,保护其三维形态;可以降低处理后的胰岛Caspase-3活性,同时可以增加葡萄糖刺激胰岛素释放,PDX-1蛋白干预后的棕榈酸组（1.560±0.074）uIU/mL,与对照组（1.426±0.056）uIU/mL相比有显著差异（P〈0.05）。结论表明PDX-1蛋白可以减少棕榈酸诱导的胰岛凋亡,保护β细胞功能。     

腹腔镜胰体尾切除术28例分析

目的探讨腹腔镜胰体尾切除术(laparoscopic distal pancreatectomy,LDP)的可行性及临床价值。方法回顾分析2014年5月至2016年9月28例施行LDP病人的临床资料。28例病人中,男性9例,女性19例,年龄17~69岁。结果 16例LDP联合脾脏切除,7例行Kimura法保脾LDP,5例行Warshaw法保脾LDP。术后病理:胰腺浆液性囊腺瘤2例,黏液性囊腺瘤9例,实性假乳头状瘤6例,导管内乳头状黏液性肿瘤(intraductal papillary mucinous neoplasm,IPMN)3例,胰岛素瘤3例,胰腺假性囊肿1例,慢性胰腺炎1例,胰腺癌3例。全组病人平均手术时间为(203±54)min;平均术中出血量为(115±138)ml。平均术后下床活动时间为(1.4±0.6)d;平均术后首次进食时间为(2.0±0.8)d;平均术后住院时间为(10±5)d。术后发生胰瘘9例(32.1%),其中A级胰瘘6例,未予特殊处理,自然痊愈;B级胰瘘3例,均经冲洗引流后痊愈。术后发生脾部分梗死2例,未予特殊处理,经3个月随访观察自然痊愈。结论 LDP安全可行,具有微创优势,值得推广应用。     

标本保存方法和时间对血清总二氧化碳结果的影响

目的研究不同的标本保存方法和时间对血清总二氧化碳（total carbon dioxide,TCO2）检测结果的影响。方法保证TCO2检测系统稳定性符合实验室质量目标的前提下,利用高值QC（quality control）、低值QC、混合血清3种样本,分别检测室温敞口、室温封口、4℃敞口、4℃封口时不同时间点TCO2的浓度,计算TCO2浓度随时间的变化率。结果高值QC、低值QC、混合血清在室温敞口保存75 min时,TCO2结果分别下降了9.65%、13.42%、7.74%;4℃敞口保存75 min时,TCO2结果分别下降了8.96%、8.60%、3.94%;在室温封口保存90 min时,TCO2结果分别下降了4.53%、9.43%、3.94%;在4℃封口保存2 h,TCO2结果仅分别下降了3.44%、3.56%、2.19%。结论随着标本保存时间的延长血清TCO2浓度不断下降,并且不同的保存方法下降的速率不同。封口保存TCO2结果下降低于敞口状态,保存温度越低TCO2结果下降越慢。     

心肌弹性成像对高血压左心室不同构型患者心肌僵硬度的评价

目的 探讨高频组织多普勒超声心动图弹性成像技术测量舒张末期左心室心肌拉伸的固有波传播速度(IVP),评价高血压左心室不同构型患者心肌僵硬度的可行性和临床价值.方法 前瞻性纳入2019年9月至2020年3月在北京朝阳医院治疗的90例高血压患者(左心室正常构型组22例、向心性重构组30例及向心性肥厚组38例)和同期门诊年龄...     

关节镜下Twin Tail TightRope带袢钛板Y型固定治疗急性RockwoodⅢb型以上肩锁关节脱位的早期疗效

目的评价Twin Tail TightRope带袢钛板Y型固定术治疗急性肩锁关节脱位的早期临床疗效。 方法回顾性分析2015年6月至2017年6月昆明市第一人民医院采用Twin Tail TightRope带袢钛板内固定系统在关节镜下行Y型固定治疗急性肩锁关节脱位患者共16例。采用视觉模拟评分法（visual analogue scale，VAS）及Constant-Murley评分评估手术效果。 结果所有患者获得随访，随访时间3~12个月，平均（6.48±1.51）个月。术后无血管、神经损伤及切口感染，末次随访时均未发生复位丢失、锁骨应力性骨折、喙突切割等并发症。末次随访时VAS评分（0.36±0.04）分较术前（7.46±1.24）分降低，Constant-Murley评分（90.07±3.13）分较术前（46.13±3.25）分提高。 结论采用Twin Tail TightRope带袢钛板Y型固定术治疗急性肩锁关节脱位可有效解决术后水平、前后方向不稳定问题，此技术具有较低的锁骨、喙突骨折发生率，关节镜下操作可以减少手术损伤、提高精准度。     

Determination of plasma antiglycan autoantibodies in patients with IgA nephropathy and the correlation with clinical characteristics

Objective To establish the measurement of IgA1 O-glycan-specific antiglycan autoantibodies in patients with IgA nephropathy (IgAN), and evaluate their role in the development and progression of IgAN. Methods In the IgAN regular follow-up cohort of Peking University Institute of Nephrology from January 2006 to December 2015, 170 patients drawn by stratified randomization were enrolled in this study. Enzyme-linked immunosorbent assay (ELISA) was used to determine the levels of plasma galactose-deficient IgA1 (Gd-IgA1) and antiglycan autoantibody (IgG and IgA1). The correlation between antiglycan autoantibodies and clinicopathological parameters was analyzed by linear correlation and multiple linear regression analysis. The receiver operating characteristic curve (ROC) was used to evaluate the value of plasma anti glycide antibodies in the diagnosis of IgAN. Results IgG and IgA1 antiglycan autoantibodies that specifically recognized Fab-hinge region (Fab-HR) antigens could be detected in both IgAN and healthy control group. Agglutinin inhibition test showed that the specific antigen epitope was N-acetylgalactosamine (GalNAc) residue exposed to galactose deficiency in IgA1 hinged region. There was no significant difference in the absolute levels of plasma IgG antiglycan autoantibodies between IgAN and healthy controls (P=0.963). After adjustment of the plasma level of IgG, the normalized antiglycan autoantibody (ln[IgG antiglycan antibody/IgG]) in patients with IgAN was significantly higher than that in healthy controls (0.58±0.31 vs 0.37±0.11, P﹤0.01). The normalized level of IgG antiglycan autoantibody in IgAN patients was positively correlated with 24 h urine protein level during renal biopsy (Spearman r=0.183, P﹤0.05), and was also significantly correlated with 24 h urinary protein level after adjusting for baseline clinical and pathological factors (β=0.713, 95%CI 0.323-1.102, P﹤0.01). The area under ROC curve (AUC) of normalized IgG antiglycan autoantibody in the diagnosis of IgAN was 0.764 (95% CI 0.682-0.845, P﹤0.05). Using the cut-off value of 0.396, the sensitivity and specificity of normalized IgG antiglycan autoantibody for IgAN were 0.729 and 0.700 respectively. There was no significant difference in the absolute or normalized levels of IgA1 antiglycan autoantibodies between IgAN patients and healthy controls. Conclusions Gd-IgA1-specific antiglycan autoantibodies can be detected both in IgAN patients and healthy controls. They are elevated in some patients with IgAN and possibly involved in the development of IgAN.     

肝脏不典型腺瘤样增生结节的MRI应用价值

目的：探讨肝脏不典型腺瘤样增生结节的MRI应用价值。方法选取该院2003年1月—2014年5月肝脏不典型腺瘤样增生结节的病人50例,常规T1 T2WI序列及正反相位序列,LAVA序列动态增强扫描。结果50例病人60个病灶,所有病灶均表现为T1WI高或稍高信号,T1WI脂肪抑制序列病灶为高信号或稍高信号,反相位序列病灶仍为高信号或稍高信号,T2WI加强病灶为低或稍低信号,该组60个病灶,其中55个病灶动态增强扫描动脉期门静脉期及延迟期病灶无强化,5个病灶呈轻中度强化。结论肝脏不典型腺瘤样增生结节的MRI表现具有一定特征性,MRI可以很好显示肝脏不典型腺瘤样增生结节病灶,是诊断肝脏不典型腺瘤样增生结节首选的影像方法,具有重要的临床应用价值。     

Anomalous functional connectivity within the default-mode network in treatment-naive patients possessing first-episode major depressive disorder

Background and Objective:Previous studies have shown that the default-mode network (DMN) has a substantial role in patients with major depressive disorder (MDD). However, there is a shortage of information regarding variations in the functional connectivity (FC) of the DMN of treatment-naive patients with first-episode MDD. The present study aims to explore the FC of the DMN in such patients.Methods:The study population consisted of 33 patients and 35 controls, paired regarding age, gender, education level, and health condition. Depression severity was assessed through the Hamilton Depression Scale (HAM-D), and subjects underwent evaluation during the resting-state through functional magnetic resonance imaging (rs-fMRI). To assess the result, we used FC and ICA. We used Spearman''s correlation test to detect potential correlations between anomalous FC and severity of HAM-D scores.Results:We have found a decreased FC in the left medial orbitofrontal gyrus (MOFG) and right marginal gyrus (SMG) in depressive patients compared to controls. There was a negative correlation between abnormal FC in the right SMG and HAM-D scores. We have not found any increase in FC of the DMN in treatment-naive, first-episode of MDD patients.Conclusions:Our study provided evidence of a negative correlation between abnormal FC in the DMN and severity of depression symptoms measured by HAM-D in treatment-naive MDD patients. This finding could shed some light on the relevance of DMN for understanding the pathophysiology of cognitive impairment in MDD.