喉癌人乳头瘤病毒感染和p53蛋白表达的研究

对４４例喉鳞癌和１６例声带息肉患者采用原位核酸杂交技术探测其人乳头瘤病毒（ＨＰＶ）６Ｂ，１１，１６，１８型ＤＮＡ同源序列及ＬＳＡＢ免疫组化法探测其Ｐ５３蛋白的表达，结果：（１）喉癌与ＨＰＶ１６／１８杂交阳性率为４３．２％（１９／４４），声带息肉为１２．５％（２／１６）（Ｐ〈０．０５）（２）喉癌ｐ５３蛋白阳性率为５６．８％（２５／４４），声带息肉全部为阴性；（３）喉癌ＨＰＶ１６／１８杂交及ｐ５３蛋白     

Effect of inflammation on endothelial cells induced by poly-L-lactic acid degradation in vitro and in vivo

Abstract

As a promising candidate, biodegradable Poly-L-lactic Acid (PLLA) has been extensively used in coronary artery stents. In our previous reports, PLLA stents implanted in porcine coronary arteries showed safety without stent thrombosis. However, inflammatory responses were observed, which needed further study. In this study, human aortic endothelial cells (HAEC) were treated with different volume percentages of extract of pre-degraded PLLA (extract of PLLA) in vitro, and the cell growth curve and morphological changes were examined. The expression of inflammatory cytokines such as NF-κB, VEGF and VCAM-1 were also observed by ELISA. In addition, PLLA stent was implanted in porcine coronary artery to examine morphological changes, functional marker eNOS and inflammatory responses. The extract of PLLA caused significant growth inhibition and release of NF-κB, VEGF and VCAM-1 in HAEC with volume percentage-dependence. Although re-endothelialization and expression of eNOS was observed, expression of NF-κB and lymphocytes surrounding PLLA were also found after PLLA stents were implanted in the artery. This study demonstrated the effects of inflammation on endothelial cells induced by PLLA degradation in vitro and showed the inflammation in vivo, suggesting that anti-inflammatory strategy is necessary for PLLA stent implantation in the artery.     

以突发截瘫为唯一症状的主动脉夹层病例1例

通过分享1例以截瘫为唯一症状的主动脉夹层病例的临床资料，结合相关文献，探讨该病的诊疗思路，减少或避免临床误诊。     

Stimulation of hepatic phenylalanine hydroxylase activity but not Pah-mRNA expression upon oral loading of tetrahydrobiopterin in normal mice

Tetrahydrobiopterin (BH4) supplementation in patients with BH4-responsive phenylalanine hydroxylase (PAH) deficiency is an alternative to low-phenylalanine diet. To further investigate hepatic BH4-responsiveness, oral administration of 50 mg BH4/kg/day for 5 weeks was performed in wild-type mice. We observed a 2-fold increase in PAH protein by quantitative Western blot analysis and a 1.7-fold increase in enzyme activity, but no change in Pah-mRNA expression by quantitative real-time PCR analysis in treated mice compared to controls. Our findings support the proposed chemical-chaperone effect of BH4 to protect PAH.     

小儿门静脉海绵样变性的彩色多普勒超声诊断

小儿门静脉海绵样变性属非肝病性的肝前性门脉高压症，本文对１４例患儿进行彩色多普勒超声检查，与手术结果进行对照。结果显示彩色多普勒超声诊断全部正确，符合率达１００％。彩色多普勒超声对明确小儿门静脉高压症的原因及指导其治疗有着重要的临床价值     

蝮蛇毒诱导小鼠心肌损伤与血清NT-proBNP表达的相关性

目的观察蝮蛇毒诱导的小鼠心肌损伤与血清NT-proBNP表达情况,以探讨蝮蛇毒诱导心肌损伤的机制。方法 96只小鼠随机分成蝮蛇毒组和正常组,蝮蛇毒组1.50 mg/kg蝮蛇毒肌注,正常组生理盐水肌注。肌注后1 h、12 h、24 h、48 h时酶联免疫吸附测定(ELISA)检测血清肌钙蛋白(cTnT)和N末端B型尿钠肽原(NT-proBNP)水平,并观察心肌组织病变。对心肌病变积分、血清cTnT水平与血清NT-proBNP水平行直线相关分析。结果蝮蛇毒组各时相点心肌病变积分和血清NT-proBNP表达水平高于正常组(P<0.05),且随时间延长而增高(P<0.05);除1 h组外,蝮蛇毒组各时相点血清cTnT水平均高于正常组(P<0.05),且随时间延长而增高(P<0.05)。小鼠心肌病变积分与血清NT-proBNP水平呈显著正相关(r=0.647,P<0.05),血清cTnT水平与NT-proBNP水平呈显著正相关(r=0.529,P<0.05)。结论蝮蛇毒可致小鼠急性心肌损伤,随时间的延长心肌损伤加重,NT-proBNP水平增高。NT-proBNP的合成与释放增加可能是蝮蛇毒诱导心肌损伤的机制之一。     

我国6个省19个城市男男性行为人群HIV-1 基因亚型及抗病毒治疗前耐药分析

目的分析我国6个省19个城市男男性行为人群(MSM)HIV-1基因亚型分布及抗病毒治疗前耐药情况。方法 2019年4-11月, 在河北、山东、江苏、浙江、福建和广东6个省19个城市收集未接受抗病毒治疗MSM HIV-1感染者的血浆样本574份, 提取RNA, 反转录后经巢式PCR扩增HIV-1pol 基因区片段。PCR 产物测序后进行序列分析, 构建系统进化树判定病毒基因亚型, 提交斯坦福耐药数据库分析耐药。结果有479份样本PCR扩增成功并获得核酸序列, 检出的HIV-1基因亚型有9种, 其中CRF01_AE(43.4%)和CRF07_BC(36.3%)所占比例较大, 随后依次为B(6.3%)、CRF55₀1B(5.9%)、CRF59₀1B(0.8%)、CRF65_cpx(0.8%)、CRF103₀1B(0.4%)、CRF67₀1B(0.4%)和CRF68₀1B(0.2%);另有26份(5.5%)样本的基因亚型为未知...     

Comparative Study on the Generation and Characteristics of Debris Induced by Fretting and Sliding

Objectives: The aim of the present work was to comparatively investigate the generation and characteristics of fretting and sliding wear debris produced by CuNiAl against 42CrMo4. Methods: Tribological tests were conducted employing a self-developed tribometer. Most experimental conditions were set the same except for the amplitudes and number of cycles. Morphological, chemical, microstructural and dimensional features of the worn area and debris were investigated using optical microscope (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and a laser particle sizer. Outcomes: Not only wear scar profiles but also the wear debris color, distribution and generated amount under fretting and sliding wear modes were quite different, which can be attributed to the significant difference in wear mechanisms. Particle size analysis indicates that the fretting debris has a smaller size distribution range; the biggest detected fretting and sliding wear debris sizes were 141 μm and 355 μm, respectively. Both fretting and sliding debris are mainly composed of copper and its oxides, but the former shows a higher oxidation degree.     

先天性外中耳畸形的诊断和治疗

目的：探讨先天性外、中耳畸形的特点,术前评估和治疗效果。方法：分析2000年6月～2005年6月接受手术治疗的先天性外耳道闭锁中耳畸形患者21例（22耳）的临床资料,全部患者均行外耳道鼓室成形术。结果：术中发现鼓室腔狭小16耳（72．7%）;听骨链畸形20耳（90．9％）,其中锤砧骨畸形19耳（86．4％）,镫骨畸形7耳（31．8％）;面神经畸形8耳（36．4％）;鼓室隔板1耳（4．5%）;垂直外耳道1耳（4．5％）。术后1个月平均语频听力提高〉15dB15耳（68．2％）,其中提高≥30dB9耳（40．9％）。随访6个月～5年,听力保持在术后水平或有轻度提高者17耳,下降3耳,失访2耳。并发外耳道闭锁1耳,狭窄3耳,鼓膜外侧愈合2耳。结论：先天性外、中耳畸形表现复杂多样,术前详细的影像学和听力学评估是保证手术成功的前提,成形一个宽敞的外耳道、预防术后感染是防止外耳道再闭锁和狭窄的关键。