虎杖中蒽醌化合物部分分离晶体抗Ⅰ型人疱疹病毒的实验研究

对虎杖中蒽醌化合物进行了分级分离，并且对乙酸乙酯卒取部分晶Ⅲ、晶Ⅳ抗ＨＳＶ－１药效，通过病毒所致细胞病变的抑制以及空斑减数实验进行了观察。结果表明，在ＨＥＰ－２细胞系统中，晶Ⅳ对ＨＳＶ－１Ｆ株的增殖及其感染均具有明显的抑制作用，ＥＤ５０分别为０．０６７ｍｇ／Ｌ及０．０３０７２ｍｇ／Ｌ，ＥＤ９０分别为３．３９８ｍｇ／Ｌ及１．８１１ｍｇ／Ｌ。同样，晶Ⅳ对ＨＳＶ－１Ｆ株也具有显著的直接杀灭作用，ＥＤ５０及ＥＤ９０分别为０．０９４４３ｍｇ／Ｌ及３．５０１ｍｇ／Ｌ。认为晶Ⅳ对ＨＳＶ－１具有显著的抑制作用，而其细胞毒作用不强，值得开发利用。     

人源细粒棘球蚴染色体测定

为鉴定棘球地细胞系及棘球绦虫的遗传分类提供依据，本实验测定了人源细粒棘球拗染色体。从外科手术的包虫病人体内获取棘球蚴原头节和生发层细胞，按染色体的常规制备方法并加以改进，制备染色体标本。通过对141个分裂像的观察分析，结果表明细粒棘球蚴染色体组的染色体数在5～20条之间，14～18条占明显优势。每一核型有一对染色体呈大棒状，似呈中间或亚中着丝粒，其余染色体呈方点状，似呈端着丝粒。本实验建立了适合棘球蚴染色体制备的方法，在国内首次测定了人源细粒棘球蚴染色体。     

SOS/umu测试法检测大气颗粒中致遗传毒性物质的初步试验

本研究采用umu测试法对本市某大气污染区颗粒提取物的致遗传毒性进行了测定。结果表明大气颗粒提取物中存在DNA具有损伤作用的致遗传毒性物质。根据β-半乳糖苷酶诱导值,表明这类具遗传毒性作用的物质,以不需肝微粒体代谢活化的成分为主,其致遗传毒性的强度与大气颗粒物的污染度呈线性相关。     

Myoblast therapy: from bench to bedside

Myoblasts are defined as stem cells containing skeletal muscle cell precursors. A decade of experimental work has revealed many properties of myoblasts, including the stability of resulting hybrid myofibers without immune suppression, the persistence of transgene expression, and the lack of tumorigenicity. Early phase clinical trials also showed that myoblast-based therapy is a promising approach for many intractable clinical conditions, including both muscle-related and non-muscle-related diseases. The potential application of myoblast therapy may be in the treatment of genetic muscle diseases, cardiomyocyte damaged heart diseases, and urinary incontinence. This review will provide an overview of myoblast biology, along with discussion of the potential application in clinical medicine. In addition, problems in current myoblast therapy and possible future improvements will be addressed.     

野生型DPP Ⅳ真核表达质粒的构建和鉴定

目的 构建野生型DPP Ⅳ真核表达质粒.方法 将野生型DPP Ⅳ基因定向克隆到真核表达质粒pcDNA3.1（＋）,构建成重组质粒pcDNA3 DPP Ⅳ;然后用限制性内切酶消化和DNA序列测定鉴定.结果 经酶切和DNA序列测定鉴定证实重组质粒构建正确.结论 真核表达质粒pcDNA3DPP Ⅳ构建成功,为进一步研究DPP Ⅳ基因在卵巢癌细胞中的表达和生物学作用奠定了基础.     

New mouse oligodendrocyte precursor (mOP) cells for studies on oligodendrocyte maturation and function

Oligodendrocyte precursor (OP) cells give rise to mature oligodendrocytes (OL), which are necessary for myelination of axons during CNS development and following damage to the myelin sheath that occurs in demyelinating diseases. To facilitate studies designed to understand OP maturation and OL function, we have developed OP cells that can be grown continuously, expanded, and differentiated into mature OLs. Cultures of late passage mOP cells grown in proliferation medium are highly pure early stage oligodendrocyte precursors where > 90% assume a characteristic bipolar morphology. Immunocytochemical analysis using antibodies that recognize progressive stages of OP maturation (A2B5, NG2, GD3 and O4) confirmed that mOP cells have a stable early stage OP cell phenotype. In addition, mOP cells can be induced to differentiate into mature forms of oligodendrocytes in vitro and in vivo, as characterized morphologically by the presence of multiple processes with secondary and tertiary branches, and by immunostaining and quantitative real-time PCR for the mature oligodendrocyte markers MBP, MAG, PLP, and MOBP. Finally, differentiation of mOP cells was accompanied by up-regulation of mRNA encoding Olig2 but not Olig1, which is consistent with previous findings showing that Olig2 is necessary for specification of oligodendrocytes. These new mOP cells should significantly benefit in vitro and in vivo studies on OP maturation and function.     

Positive Expression of LSD1 and Negative Expression of E-cadherin Correlate with Metastasis and Poor Prognosis of Colon Cancer

Background

The first identified lysine-specific demethylase, LSD1, plays an important role in the metastatic progression of several types of cancer.

Aims

The aim of this study was to investigate LSD1, E-cadherin, and N-cadherin expression in colon cancer specimens and their clinical significance.

Methods

The expression of LSD1, E-cadherin, and N-cadherin in colon cancer specimens was determined by immunohistochemistry, and the relationship between the expression of the respective molecules and clinicopathological characteristics was analyzed.

Results

The positive expression rates of LSD1, E-cadherin, and N-cadherin in colon cancer specimens were 66.7 % (72/108), 85.2 % (92/108), and 41.7 % (45/108), respectively. LSD1 was significantly more highly expressed in colon cancer specimens classified as high TNM stage lesions and with distant metastasis (P < 0.05). Further analysis demonstrated that LSD1 expression was positively correlated with lymph node and distant metastases (P < 0.05). However, E-cadherin expression was significantly downregulated in colon cancer specimens classified as high TNM stage lesions and with distant metastasis (P < 0.05), whereas the expression of N-cadherin did not differ significantly according to clinical and pathological characteristics (P > 0.05). Correlation analysis revealed that LSD1 expression was negatively correlated with E-cadherin expression (r _s = ?0.318, P = 0.001), but not evidently correlated with N-cadherin expression (r _s = 0.182, P = 0.06). Colon cancer specimens with positive LSD1 expression and negative E-cadherin expression were correlated with significantly lower overall survival.

Conclusions

LSD1 showed a significantly higher expression, in contrast to the significantly lower expression of E-cadherin, in colon cancer specimens classified as high TNM stage lesions and with distant metastasis. Positive expression of LSD1 and negative expression of E-cadherin may be predictors of a worse colon cancer prognosis.     

邻苯二甲酸二乙基己基酯对子代大鼠肺损伤的作用及其机制

目的:研究邻苯二甲酸二乙基己基酯(DEHP)对出生后第21天(PND21)子代大鼠肺脏的损伤作用及其机制。方法:受孕SD大鼠24只,随机均分为正常对照(NC)组、低剂量染毒(L)组、中剂量染毒(M)组和高剂量染毒(H)组,从怀孕第1天至产后PND21,每天给予不同剂量DEHP(0、10、100、750 mg·kg-1·d-1)母鼠灌胃。获取PND21子代大鼠肺泡巨噬细胞(AM)并培养。分别测定AM内超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-PX)活性;Masson染色及光镜、电镜观察肺组织病理学改变;免疫组化和RT-PCR检测肺组织骨桥蛋白(OPN)及其基因表达。结果:H组肺泡隔增厚,肺间质细胞增多,肺泡数目减少;M、H组肺细小动脉以及肺间质胶原纤维沉积较NC组增多,以H组最为显著;超微结构显示M、H组肺泡II型上皮细胞核固缩,板层小体空泡化,线粒体肿胀、变圆,嵴变短;M、H组AM内SOD和GSH-PX酶活性明显低于NC组(P<0.05);M、H组OPN及其mRNA表达较NC组显著上调(P<0.05),L组与NC组相比,差异无统计学意义(P>0.05)。结论:DEHP对PND21子代大鼠肺损伤主要表现为肺间质纤维化,肺泡II型上皮细胞损伤、AM抗氧化能力的下降及OPN的表达升高可能是其机制。     

显微手术和非显微手术治疗椎管内肿瘤100例的比较分析

目的比较非显微手术与显微手术治疗椎管内肿瘤的临床疗效及术后恢复情况。方法回顾性分析100例椎管内肿瘤患者的临床资料,对非显微手术组与显微手术组的治疗效果进行了比较分析。结果 A组(显微手术组)手术时间(3.9±0.8)h,出血量(414±87)ml,脑脊液漏发生2例(发生率4.0%),平均住院时间(13±3)d;B组(非显微手术组)手术时间(2.1±0.5)h,出血量(680±106)ml,脑脊液漏发生9例(发生率18.0%),平均住院时间(22±13)d。A组有47例患者肿瘤全切除(全切率94%),B组全切除肿瘤仅34例(全切率68%)。A组中疼痛患者有93.3%有所缓解;感觉障碍的患者有76.5%得到不同程度的缓解,2例加重;运动障碍的患者都得到不同程度的改善;尿潴留或尿失禁患者有86.7%得以缓解。B组中疼痛患者仅有63.6%症状有所缓解;感觉障碍的患者有54.2%得到不同程度的缓解;运动障碍的患者有55%得到不同程度的改善;尿潴留或尿失禁患者仅45.5%得以缓解。可见显微手术组各方面均优于非显微手术组(P<0.05)。术后随访时间为6个月~3年,平均随访时间28.3个月,随访率76%。A组随访患者术后未见并发症发生;B组随访患者术后肿瘤复发6例,继发性椎管狭窄5例。结论显微手术治疗椎管内肿瘤具有创伤小、安全性高等优点。显微手术是治疗椎管内肿瘤的有效方法。