Neutralizing effect of zinc oxide on dehydroabietic acid-induced toxicity on human polymorphonuclear leukocytes

The cytotoxic effect of dehydroabietic acid (DHAA), a resin acid found in rosin, was studied on human polymorphonuclear leukocytes using leakage of 51Cr from prelabeled cells, supravital staining, and transmission electron microscopy. DHAA caused a strong dose-related release of 51Cr, a high uptake of trypan blue, and total cell necrosis, as seen in transmission electron microscopy. Albumin slightly reduced the toxic effects, whereas the addition of zinc in various forms strongly inhibited these toxic effects of DHAA in the concentration range of 10-500 micrograms/mL. In the presence of albumin, zinc oxide as a suspension inhibited the damage of the cell membranes more than a filtrate of zinc oxide, indicating a subsequent slow release of zinc from the zinc oxide.     

正丁酸钠对人胃腺癌细胞染色体数目和DNA含量的影响

培养的人胃腺癌MGc 80-3细胞经过正丁酸钠处理7天后,生长抑制率达50.7%,约有90%的细胞形态发生分化,其超微结构亦有显著改变。而且,在染色体数目上,超二倍体细胞由对照组的78%增加到实验组的96%,超三倍体和超四倍体细胞则分别从6%和14%下降至2%。同时应用~3H-TdR放射自显影和福尔根细胞光度法测定未标记细胞(G_1期)DNA含量,结果显示实验组比对照组降低了。而且在实验组的同一制片中,未分化细胞DNA含量平均为超六倍体值(DI=3.67和3.56),其中90%的细胞超过6C;分化细胞DNA含量则平均为近四倍体值(DI=2.03和1.99),其中近60%的细胞少于4C。两者差异统计显著,表明形态分化的人胃腺癌细胞的遗传物质含量明显减少,但这些细胞并非就是正常二倍体细胞。     

Lectin cell adhesion molecules (LEC-CAMs): a new family of cell adhesion proteins involved with inflammation.

The means by which leukocytes, including lymphocytes, monocytes, and neutrophils, migrate from the circulation to sites of acute and chronic inflammation is an area of intense research interest. Although a number of soluble mediators of these important cellular interactions have been identified, a major site of great importance to the inflammatory response is the physical interface between the white cell and the endothelium. This critical association is mediated by an array of cell surface adhesion molecules. Previous data have demonstrated that the integrin subfamily of heterotypic adhesion molecules was a major component of these adhesive interactions, although it was clear that other, non-integrin-like molecules of unknown identity also seemed to be involved during the inflammatory process. A number of these other cell-surface glycoproteins which may be involved with inflammation have recently been characterized by molecular cloning. These glycoproteins, including the peripheral lymph node homing receptor (pln HR), the endothelial cell adhesion molecule (ELAM), and PADGEM/gmp140, are all members of a family of proteins which are unified by the inclusion of three characteristic protein motifs: a lectin or carbohydrate recognition domain, an epidermal growth factor (egf) domain, and a variable number of short consensus repeats (scr) which are also found in members of the complement regulatory proteins. The appearance of lectin domains in all of these adhesion molecules is consistent with the possibility that these glycoproteins function by binding to carbohydrates which are expressed in a cell and/or region specific manner, and the members of this adhesion family have been given the generic name LEC-CAM (lectin cell adhesion molecules).(ABSTRACT TRUNCATED AT 250 WORDS)     

Depletion of abundant human serum proteins by per se imprinted cryogels based on sample heterogeneity

Macroporous cryogels were prepared and used to deplete abundant proteins. It was accomplished based on the sample heterogeneity rather than any exogenous assistance. Human serum was added in monomer solutions to synthesize molecularly imprinted polymers; therein some abundant proteins were imprinted in the polyacrylamide cryogels. Meanwhile the rare components remained aqueous. Chromatography and electrophoresis showed that albumin, serotransferrin, and most globulins were depleted by columns packed with the molecularly imprinted polymers. After the depletion, lower abundance proteins were revealed by SDS‐PAGE, peptide fingerprint analysis, and identified by MALDI‐TOF‐MS. This is an example that a “per se imprint” protocol enables to gradually dimidiate proteomes, simplify sample complexities, and facilitate further proteome profiling or biomarker discovery.     

人结核分枝杆菌特异性核酸探针制备及结核病PCR检测技术的初步临床应用

采用人结核分枝杆菌(Mycobacterium tuberculosis TB)染色体DNA为模板,选择位于插入片段IS6110中884～865和568～588碱基对处的两个片段为引物,扩增出317bp的特异性片段．将其克隆进pUCl9载体。酶切图谱分析和DNA序列测定证实为目的片段。该片段经DIG标记,分别与11种分枝杆菌DNA进行Southern杂交,结果证明只与人型复合分枝杆菌发生杂交反应。利用该对引物建立的PcR检测拄术对74份结核病痰液标本进行检测,并与临床细菌快速培养结果相比较,发现48份临床阳性均为PcR阳性,在26份临床阴性标本中亦发现11份PCR检测阳性。将标本PCR产物与克隆探针进行杂交,显示两者结果完全一致。说明PCR检测体系结果可靠,其灵敏度明显高于目前临床所采用的方法,可作为一种常规技术用于结核病的临床检测。     

低强度微波辐射对人精子非热生物效应的研究

选用频率２４５０ＭＨｚ分别在３、５、７、９ｍＷ／ｃｍ２的功率密度,使用新型宽带横电磁传输室（ＢＴＥＭＣＥＬＬ）辐射人精子１小时,我们发现只有５ｍＷ／ｃｍ２的强度对人射子的活动度、存活率、畸形率又穿卵率有显著的影响,这表明在５ｍＷ／ｃｍ２附近存在明显的功率密度窗效应。同时还发现,７ｍＷ／ｃｍ２组的精子的染色体出现畸变。最后对实验结果进行了讨论。     

HCMV-DNA定量检测和HCMV-IgG抗体AI检测在儿童HCMV感染诊断中的临床价值

摘要 目的：探讨人巨细胞病毒（HCMV）-DNA定量检测和HCMV-免疫球蛋白G（IgG）抗体亲和力指数（AI）检测在儿童HCMV感染诊断中的临床价值。方法：收集高度疑似HCMV活动性感染患儿血清样本103例作为研究组,健康体检儿童血清样本94例作为对照组。分析HCMV-DNA定量检测结果和HCMV-IgG抗体AI检测结果,并比较不同年龄、不同性别患儿HCMV-DNA阳性结果检出率和低HCMV-IgG抗体AI检出情况。结果：研究组血清HCMV-DNA阳性率为33.01%（34/103）,对照组血清HCMV-DNA均为阴性,研究组血清HCMV-DNA阳性率明显高于对照组,差异有统计学意义（P<0.05）。研究组血清低HCMV-IgG抗体AI检出率为13.59%（14/103）,对照组未检出低HCMV-IgG抗体AI,研究组血清低HCMV-IgG抗体AI检出率高于对照组,差异有统计学意义（P<0.05）。研究组不同性别之间患儿血清的HCMV-DNA阳性率、低HCMV-IgG抗体AI检测结果均无统计学差异（P>0.05）。研究组年龄1～5岁患儿血清HCMV-DNA阳性率明显低于年龄1 d～<6个月和年龄6个月～<1岁患儿（P<0.05）。三个年龄段患儿的血清低HCMV-IgG抗体AI检测结果均无统计学差异（P>0.05）。结论：1岁以下儿童更易受到HCMV感染,HCMV-DNA定量检测和HCMV-IgG抗体AI检测结果可以为临床早期诊断和治疗HCMV感染提供有效依据。     

Solute complexation degree with human serum albumin: biochromatographic approach

A mathematical model was developed for the study of the D,L-dansylamino acid retention mechanism in reversed-phase liquid chromatography using a C18 column as a stationary phase and human serum albumin (HSA) as an eluent modifier. The solute retention factor is dependent on the HSA concentration in the eluent as well as the binding constant of the guest-HSA complex. A determination of the degree of complexation n(c) (the percent of the complexed guest) could be carried out. Different Van 't Hoff plot shapes of the degree of complexation were observed with different eluent pH, confirming a change in the solute complexation mechanism for physiological pH (between 7-7.5). Enthalpy-entropy compensation was also analysed in relation to this mathematical model to confirm the solute complexation behavior with HSA. These results finally confirmed that at physiological pH and temperature (approximately 35 degrees C) values the HSA was in a favorable structural conformation for its binding with a great majority of drugs.     

Anti-hypertensive effects of Rosuvastatin are associated with decreased inflammation and oxidative stress markers in hypertensive rats

Among their pleiotropic effects, statins exert antioxidant and anti-inflammatory properties. The aim of this study was to evaluate in normotensive (WKY) and in spontaneously hypertensive rats (SHR) the effect of rosuvastatin (ROSU) treatment on (1) plasma inflammation markers and endogenous NO synthase inhibitor (ADMA) levels, (2) reactive oxygen species (ROS) generated by circulating leukocytes and (3) vascular oxidative stress and tissue inflammation markers. Plasma cytokines were higher in SHR than in WKY, except for IL-4, which was lower in SHR than in WKY. SHR monocytes exhibited higher production of ROS than did WKY monocytes. In the experimental conditions, ROSU did not modify plasma cholesterol levels in SHR but attenuated the increase in systolic blood pressure. In SHR only, ROSU lessened pro-inflammatory cytokines and ADMA levels, increased IL-4 and reduced ROS production in circulating monocytes. These results demonstrate the beneficial effects of ROSU in SHR, independently of any lowering of cholesterol levels.     

1例耐多药复杂重组人类免疫缺陷病毒1型亚型感染病例的抗病毒治疗

随着抗病毒治疗时间的延长,如何处理人类免疫缺陷病毒（HIV）耐药患者是临床医师面对的一个挑战。本文报道对1例耐多药复杂重组HIV-1亚型感染病例成功进行抗病毒治疗的过程,总结了抗病毒依从性的重要性,即只有规律服药才能达到好的治疗效果。临床上可应用病毒基因耐药检测来指导抗病毒药物的选择,但应注意体外实验与体内实际情况可能存在的差异。此外,需进一步研究一些少见亚型毒株对药物的反应及对药物压力的逃避机制。