Donor origin of multipotent adult progenitor cells in radiation chimeras

Multipotent adult progenitor cells (MAPCs) are bone marrow-derived stem cells that have extensive in vitro expansion capacity and can differentiate in vivo and in vitro into tissue cells of all 3 germinal layers: ectoderm, mesoderm, and endoderm. The origin of MAPCs within bone marrow is unknown. MAPCs are believed to be derived from the bone marrow stroma compartment as they are isolated within the adherent cell component. Numerous studies of bone marrow chimeras in the human and the mouse point to a host origin of bone marrow stromal cells. Mesenchymal stem cells (MSCs), which coexist with stromal cells, have also been proven to be of host origin after allogeneic bone marrow transplantation in numerous studies. We report here that following syngeneic bone marrow transplants into lethally irradiated C57BL6 mice, MAPCs are of donor origin.     

Ｏ１群霍乱弧菌毒力基因和菌株流行能力关系研究

摘要：目的　调查福建省１９６２－２００５ 年不同流行时期、不同流行血清型的Ｏ１ 群埃尔托型霍乱弧菌
（ＥＶＣ）毒力基因分布情况;探讨霍乱弧菌（ＶＣ）不同毒力基因特征与霍乱流行能力的关系。方法　运用
ＰＣＲ 扩增技术,检测１９６２－２００５ 年６９ 株（稻叶２１、小川４８） 霍乱患者分离株的犮狋狓犃基因, 同时进行
犮狋狓犅、狋犮狆犃、狉狊狋犚、犺犾狔犃毒力因子的古典型（犆犾）和埃尔托型（犈犾）基因亚型的扩增;结合流行病学资料
分析不同毒力特征菌株的流行能力。结果　６９株Ｏ１群霍乱弧菌犮狋狓犃基因阳性６２株,犮狋狓犃基因阴性的菌
株均不同程度地携带有其他各相关毒力基因;各毒力因子古典型和埃尔托型的阳检率分别为犮狋狓犅６０．９％
（４２株）和７２．５％ （５０株）,狉狊狋犚３７．７％ （２６株）和７２．５％ （５０株）,狋犮狆犃４．３５％ （３株）和６９．５７％ （４８
株）,犺犾狔犃６５．２２％ （４５株）和７９．７１％ （５５株）。犮狋狓犅 犆犾、狉狊狋犚 犆犾基因以及菌株同时携带狉狊狋犚 犆犾和狉狊狋犚
犈犾基因的阳性率在稻叶型（阳性率分别为３８．１％ 、０ 和０） 和小川型（阳性率分别为７０．８％ 、５４．２％ 和
３５．４％ ）菌株中的差异有统计学意义（犘均＜０．０５）。犮狋狓犅 犈犾、狉狊狋犚 犆犾、狉狊狋犚 犈犾基因的阳性率在１９６２－
１９６４年、１９７８ 年、１９９４－２０００ 年的小川型３ 个不同流行时期（阳性率分别为犮狋狓犅 犈犾：１００．０％ 、
１００．０％ 、４４．８％ ;狉狊狋犚 犆犾：０、０、８９．７％ ;狉狊狋犚 犈犾：１００．０％ 、８７．５％ 、５８．６％ ） 的差异有统计学意义
（犘均＜０．０５）。犮狋狓犅 犆犾、犮狋狓犅 犈犾、狉狊狋犚 犈犾基因的阳性率在１９８０－１９８６ 年、２００５ 年稻叶型两个不同流行
时期（阳性率分别为犮狋狓犅 犆犾：１３．３％ 、１００．０％ ;犮狋狓犅 犈犾：１００．０％ 、６６．７％ ;狉狊狋犚 犈犾：９３．３％ 、５０．０％ ）
的差异有统计学意义（犘均＜０．０５）。结论　福建省１９６２－２００５年Ｏ１群霍乱菌株不同程度地携带有相关的
毒力因子;各毒力因子埃尔托型基因片段的检出率均要高于古典型,以狉狊狋犚和狋犮狆犃基因的差异最明显;
相对于稻叶血清型,小川血清型更容易整合古典型的犮狋狓犅和狉狊狋犚基因片段;犮狋狓犅和狉狊狋犚基因的类型和不
同血清型霍乱菌株的流行能力有相关性。
关键词：霍乱弧菌;毒力基因;ＰＣＲ;等位基因
中图分类号：Ｒ１８３．４　　文献标识码：Ａ　　文章编号：１００９ ６６３９ （２０１４）０１ ００４１ ０５     

Self-catheterization of urinary bladder complicated with extraperitoneal abscess that mimics an infected bladder diverticulum

For patients who are suffering from neurogenic lower urinary tract dysfunction, intermittent urinary catheterization is an efficient way to empty the bladder.¹ However, the method may result in various complications. Herein we present a rare complication of extraperitoneal abscess owing to intermittent urinary catheterization in a 62-year-old male who had cervical spine injury and was treated with intermittent urethral catheterization for neurogenic lower urinary tract dysfunction. Treatment and a literature review are also described.     

Inhibition of IFN-γ promotes anti-asthma effect of Mycobacterium bovis Bacillus Calmette-Guerin neonatal vaccination: A murine asthma model

Objective

The Mycobacterium bovis Bacillus Calmette-Guerin (BCG) neonatal vaccination inhibits allergy-induced pathologic changes. However, the mechanisms underlying this process are unclear. This study aimed to investigate the role of interferon (IFN)-γ and interleukin (IL)-17 in the protective effects of the BCG neonatal vaccination on allergic pulmonary inflammation and airway hyperresponsiveness (AHR).

Methods

Wild type (WT)-neonate and IL-17 knock out (KO) neonate mice were vaccinated with BCG. A murine asthma model was developed by sensitization and then challenging with ovalbumin (OVA). Recombinant IL-17 or recombinant IFN-γ was delivered to the airway to overexpress IL-17 or IFN-γ. An anti-IFN-γ neutralizing antibody was used to block the effects of IFN-γ.

Results

We found exogenous IL-17 delivered to the airway reversed the anti-asthma effects of the neonatal BCG vaccination. BCG neonatal vaccination further reduced OVA-induced inflammation and AHR in IL-17 KO mice. Inhibition of IFN-γ in BCG neonatal vaccinated OVA-induced asthma model mice led to a further reduction in airway inflammation and AHR. In addition, airway inflammation and AHR were robust following treatment with exogenous IFN-γ. Neutralizing IL-17 was not sufficient to block OVA-induced airway inflammation and AHR. In IL-17 KO mice, airway inflammation and AHR did not occur following treatment with an anti-IFN-γ neutralizing antibody.

Conclusions

In an OVA-induced murine asthma model, inhibition of IFN-γ enhanced the anti-asthma effects of BCG neonatal vaccination.     

椎间隙改良穿刺抽吸活检对腰椎化脓性椎间盘炎的诊断价值

【摘要】 目的：探讨椎间隙改良穿刺抽吸活检法对腰椎化脓性椎间盘炎的诊断价值。方法：2003年9月~2011年10月西安交通大学医学院附属红会医院收治腰椎化脓性椎间盘炎患者97例,男48例,女49例,年龄17~87岁,平均61.7岁。病变节段：L1/2 7例,L2/3 14例,L4/5 33例,L5/S１ 43例。均行血细菌培养检查。均在CT引导下对病变部位进行经皮椎间隙穿刺抽吸活检,根据穿刺方法将患者分为3组,A组用传统穿刺方法（即方法A）,于病变椎间隙经CT定位皮肤穿刺针进针点位置,置入21G穿刺针抽吸标本;B组,如果方法A未抽出液体,则注入生理盐水,再回抽液体（即方法B）;C组,如果方法B未抽出液体,则在病变椎间隙对侧经CT定位皮肤穿刺针进针点位置,置入另一根21G穿刺针进入椎间隙,从第一根针注入生理盐水,再用对侧的穿刺针回抽液体（即方法 C）,方法B、C称为改良穿刺抽吸活检法。穿刺标本均行细菌培养检查。改良穿刺抽吸活检取得标本的成功率与传统穿刺法取得标本的成功率的比较采用T检验。血细菌培养阳性率与穿刺标本细菌培养阳性率的比较采用卡方检验。结果：97例患者均取得了标本,其中A组41例,B组36例,C组20例。97例患者采用方法A穿刺活检,仅41例取得标本;对采用方法A未能取得标本的56例患者采用方法B或C穿刺活检均能取得标本。方法B+C取得标本的成功率与方法A比较差异有显著性（P＜0.05）。97例穿刺标本中,93例细菌培养阳性（阳性率95.8%）,其中金黄色葡萄球菌47例（50.5%）,链球菌/肠球菌17例（18.28％）,大肠杆菌13例（13.98％）,假单胞菌10例（10.75％）,其他6例（6.45%）。97例行血细菌培养,其中47例（48.5%）阳性,金黄色葡萄球菌27例（57.44%）,链球菌/肠球菌9例（19.15％）,大肠杆菌6例（14.77％）,假单胞菌4例（8.51％）,其他1例（2.13%）。穿刺活检标本细菌培养阳性率与血细菌培养阳性率比较差异有显著性（P＜0.05）。血细菌培养阳性的47例患者,穿刺活检标本细菌培养均阳性,且培养出的细菌与血培养细菌一致。结论：椎间隙改良穿刺抽吸活检能提高腰椎化脓性椎间盘炎的病原学诊断率,其方法简单,取得标本的成功率高。     

重组腺病毒Ad-APN-EGFP的构建与促进种植体周围成骨

目的 构建重组腺病毒Ad-APN-EGFP,研究其转染效率和对种植体周围成骨的影响。方法 构建含脂联素（APN）基因的的重组腺病毒Ad-APN-EGFP,并测序鉴定和酶切鉴定。体外转染大鼠骨髓间充质干细胞（BMSCs）,检测转染效率和APN基因mRNA表达;建立大鼠股骨干骺端羟磷灰石涂层种植体植入动物模型。植入种植体前,实验组于植入体窝注入10 μL的Ad-APN-EGFP悬浮液;对照组注入10 μL的PBS。4周后取材,光镜下观察种植体周围成骨。结果 测序鉴定和酶切鉴定表明,成功构建重组腺病毒Ad-APN-EGFP;转染大鼠BMSCs效率可达90%以上,并能高表达APN基因mRNA;体内实验显示实验组种植体周围成骨明显高于对照组。结论 重组腺病毒Ad-APN-EGFP可以提高大鼠BMSCs的APN基因表达,具有促进种植体周围成骨的作用。     

Confinement Effect and Efficiency of Concentrically Loaded RACFCST Stub Columns

Recycled aggregate concrete-filled steel tubular (RACFST) columns are widely recognized as efficient structural members that can reduce the environmental impact of the building industry and improve the mechanical behavior of recycled aggregate concrete (RAC). The objective of this study is to investigate the behavior of recycled aggregate concrete-filled circular steel tubular (RACFCST) stub columns subjected to the axial loading. Three-dimensional finite element (FE) models were established using a triaxial plastic-damage constitutive model of RAC considering the replacement ratio of recycled aggregates. The FE analytical results revealed that the decreased ultimate bearing capacity of RACFCST stub columns compared with conventional concrete infilled steel tubular (CFST) columns was mainly due to the weakened confinement effect and efficiency. This trend will become more apparent with the larger replacement ratio of recycled aggregates. A practical design formula of the ultimate bearing capacity of RACFCST stub columns subjected to axial load was proposed on the basis of the reasonably simplified cross-sectional stress nephogram at the ultimate state. The derivation process incorporated the equilibrium condition and the superposition theory. The proposed equation was evaluated by comparing its accuracy and accessibility to some well-known design formulae proposed by other researchers and some widely used design codes.     

MiRNA let-7a对人喉鳞癌细胞增殖的抑制作用CSCD

目的探讨miRNA let-7a调控高迁移率族蛋白2(HMGA2)对人喉鳞癌细胞株TU212增殖的影响。方法合成let-7a模拟体(let-7a mimics)并采用阳离子脂质体法瞬时转染入喉癌TU212细胞,裸鼠皮下注射TU212细胞,构建裸鼠移植瘤模型。RT-qPCR和Western blot法分别检测转染后TU212细胞及移植瘤内let-7a和HMGA2的表达。结果在过表达let-7a的喉癌TU212细胞中,HMGA2的转录和翻译水平下调,细胞增殖能力降低。体外成瘤实验证实,与let-7a NC组和空白对照组相比,转染let-7a mimics的喉癌细胞TU212成瘤组织的质量和体积均显著下降;let-7a过表达的TU212成瘤组织中HMGA2的mRNA和蛋白水平均明显下调。结论let-7a能显著抑制HMGA2的mRNA和蛋白表达,进而显著抑制喉癌细胞的增殖。     

IMRT联合TP方案治疗晚期食管鳞癌的临床疗效及对患者血清MMP2、TIMP2、nm23-H1及不良反应的影响

目的分析调强放射治疗(IMRT)联合TP方案治疗晚期食管鳞癌的临床疗效及对患者血清基质金属蛋白酶2(MMP2)、组织金属蛋白酶抑制剂2(TIMP2)、nm23-H1及不良反应的影响。方法选取晚期食管鳞癌患者80例为研究对象,按随机数字表法将其分为观察组(n=40,采用IMRT联合TP方案化疗)、对照组(n=40,单纯采用IMRT治疗),比较2组临床疗效、治疗前后血清MMP2、TIMP2、nm23-H1表达阳性率、局控率与生存情况及不良反应。结果观察组治疗有效率(85.00%)明显高于对照组(65.00%)(P<0.05)。治疗后2组血清MMP2表达阳性率下降,而TIMP2、nm23-H1表达阳性率上升,且观察组治疗后血清MMP2表达阳性率低于对照组,而TIMP2、nm23-H1表达阳性率高于对照组(P<0.05)。观察组治疗后1年、2年局控率高于对照组,但2组治疗后1年、2年生存率差异无统计学意义(P>0.05)。观察组白细胞减少、放射性食管炎发生率高于对照组(P<0.05),2组其他不良反应发生率差异无统计学意义(P>0.05)。结论晚期食管癌患者采用IMRT联合TP方案治疗可获得较好的疗效,对患者血清MMP2、TIMP2、nm23-H1有明显改善,但可能会较单纯IMRT治疗具有更多不良反应,需加以监测。