转化生长因子β3基因三个单核苷酸多态性与中国人群高血压病未见相关

目的　探讨转化生长因子β3 (TGF β3 )基因单核苷酸多态性 (singlenucleotidepolymorphisms, SNP)与中国人高血压病(EH)的关系。方法　通过直接测序法筛选位于TGF β3基因启动子、编码区和部分内含子中SNP,作为关联研究的遗传标记。采用病例 对照研究,利用限制性片段长度多态性 (RFLP)及等位基因专一PCR法,在 396例EH患者及 214例正常对照人群中,进行TGF β3基因编码区Thr63Asn、内含子区SS5608219、SS5608220三个多态性基因型检测,比较病例与对照组间基因型分布及基因频率的差异。结果　TGF β3基因测序总长度 5457bp,共发现 7个SNP,位于内含子区 5个、编码区和 3′非翻译区各 1个。其中 2个为新发现的SNP,包括 1个位于编码区能引起氨基酸改变的Thr63Asn多态性。在病例 对照研究中,Thr63Asn、SS5608219和SS5608220三个多态性的基因型分布和等位基因频率,在EH组与正常对照组之间差异无统计学意义 (P>0 05 )。结论　在中国人TGF β3基因中,新发现 2个SNP,其中 1个位于外显子 1第 63密码子(A→C),可引起组氨酸替代天门冬酰胺。但在关联研究中,未发现TGF β3基因的三个SNP与中国汉族人群EH有关。     

降纤酶合舒血宁注射液对脑梗死急性期神经内分泌激素的影响

目的观察降纤酶、舒血宁注射液对脑梗死急性期神经内分泌激素(ACTH、ET、CORT、TXB2、PBI2)的影响.方法将脑梗死急性期病人随机分为治疗组(48例)和对照组(24例),予降纤酶、舒血宁注射液分别行颈动脉灌注(治疗组)和静脉输注(对照组),治疗组降纤酶总量为对照组的一半;治疗前后分别测试血ACTH、ET、CORT、TXB2、PBI2水平.结果两组治疗后ACTH、ET、CORT、TXB2、PBI2水平均较治疗前明显下降(P＜0.01);组间比较,上述指标无统计学意义.结论降纤酶、舒血宁注射液可降低神经内分泌激素水平,并可能对神经内分泌免疫网络具有双向调节作用;且颈动脉灌注使用较小剂量降纤酶的药效与静脉给予较大剂量作用相当.     

Effect of operation-synchronizing transfusion of apoptotic spleen cells from donor rats on acute rejection of recipient rats after liver transplantation

AIM: To study effect of operation-synchronizing transfusion of apoptotic spleen cells from donor rats on acute rejection of recipient rats after liver transplantation. METHODS: Two of Wistar rats were chosen randomly for normal liver pathology control and ten of SD rats chosen randomly for liver function control as blank group (no operation). The rest of Wistar and SD rats were divided into four groups: control group (only liver transplantation), Dex group (donors receiving intraperitoneal injection of dexamethasone), SpC group (recipients receiving infusion of spleen cells of donors), Dex-SpC group (recipients receiving infusion of apoptotic spleen cells of donors), with each group except blank group, containing 10 SD rats and 10 Wistar rats, respectively. Wistar rats received liver transplantation from SD rats, in the meantime they received infusion of spleen cells of donors, which were induced by an intraperitoneal injection of dexamethasone (3 mg/(d.kg)·b.w) for three days before liver transplantation. The serum alanine transaminase (ALT), total bilirubin (T bili), liver pathological changes and survival time were analysed. Statistical analysis was carried out using SPSS 10.0 for Windows. Differences of the parametric data of ALT in means were examined by one-way ANOVA. Differences of ALT between two groups were examined by LSD. Differences of the nonparametric data of T bili in means and scores of pathology classification for acute rejection were examined by Kruskal-Willis H test. The correlations between ALT and T bili were analysed by Bivariate. Kaplan-Meier curves were used to demonstrate survival distribution. The log-rank test was used to compare the survival data. RESULTS: There were significant differences in ALT of the five groups (F= 23.164 P= 0.000), and ALT in Dex-SpC group was significantly higher than that in blank control, control, Dex, and SpC groups (P = 0.000), and ALT in SpC group was significantly higher than that in blank control (P= 0.000), control (P= 0.004), and Dex groups (P= 0.02). Results of nonparametric analysis of T bill showed that there were differences in T bill of the five groups (X2= 33.265 P= 0.000). T bili in Dex-SpC group was significantly higher than that in blank control, control, Dex, and SpC groups. T bili in SpC group was higher than that in blank control, control, and Dex groups. There were significant differences in scores of pathology classification for acute rejection in each of the groups (X2= 25.933, P= 0.000). The pathologically more serious acute rejection was found in Dex-SPC group than in other groups. No sign of acute rejection was observed in the blank control group. Slight acute rejection was observed in the control group. Slight-moderate acute rejection was observed in the Dex group. Moderate-acute rejection was observed in the SpC group. Severe-acute rejection was observed in the Dex-SpC group. The survival time in Dex-SpC group was shorter than in other groups (statistic = 11.13, P= 0.011). ALT and T bili were positively correlated (r= 0.747, P= 0.000, two-tailed). CONCLUSION: In order to reduce quantity of blood loss from rats after liver transplantation, only one of ALT or T bili is needed for liver function measurement of rats. Simultaneous injection of apoptotic spleen cells from donors induced by dexamethasone to liver transplantation rats aggravates acute rejection. One important mechanism of aggravation of acute rejection may be that apoptotic cells are not removed in time and that dead cells including apoptotic cells release inflammatory factors.     

HCV selection and HVR1 evolution in a chimpanzee chronically infected with HCV-1 over 12 years.

Aim: To study hepatitis C virus (HCV) selection and hypervariable region-1 (HVR1) evolution in a chimpanzee chronically infected with HCV-1 over 12 years after inoculation with a human factor VIII concentrate contaminated with HCV. Methods: From the inoculum, the earliest chimpanzee plasma and 12 annual plasma samples, HCV fragments including HVR1 were amplified followed by cloning and sequencing. Results: Five HCV subtypes - 1a, 1b, 2a, 2b, 3a - and multiple 1a strains were identified in the inoculum. Two 1a strains were found in the earliest chimpanzee sample, while a single HCV-1 strain was detected in the 12 annual samples. None of the chimpanzee sequences were identical to those found in the inoculum. Over 12 years, HVR1 patterns changed irregularly, but a few patterns showed identical nucleotide or amino acid sequences. In the last three years, the variety of HVR1 patterns decreased, while the proportion of major patterns increased. These corresponded to a higher virus load and a lower number of amino acid substitutions. Simultaneously, the HVR1 sequences became more similar to the consensus sequence of the 1a subtype. Conclusion: HCV selection was observed from the inoculum to the inoculated chimpanzee and from the early acute hepatitis to the persistent chronic infection. The selection occurred at three levels: among subtypes after transmission, among isolates during acute hepatitis and among quasispecies in chronic infection.     

高效抗逆转录病毒治疗15例人类免疫缺陷病毒感染者一年总结

目的 首次报道我国于1999年5月开始对人类免疫缺陷病毒（HIV）－1感染者的规范化高效抗逆转录病毒治疗。方法 用齐多夫定＋拉米夫定（AZT＋3TC,商品名：双汰芝）联合硫酸茚地那韦（indinavir,商品名：佳息患）对15例HIV感染或艾滋病患者进行为期1年的治疗。随访指标为病毒载量和T淋巴细胞亚群分析。结果 15例随访1年,用药3个月后HIV－1 RNA平均值至198拷贝／ml,比治疗前的90743RNA拷贝／ml下降2.7log。用药后12个月CD4细胞计数平均增加67个／μl,CD8细胞计数平均减少192个／μl,CD4／CD8比例从0．35增加到0．56,15例中2例未作T淋巴细胞亚群分类,13例治疗后3、6、9、12个月CD4^ 童贞细胞（CD45RA＋CD62L＋）数呈现平稳上升趋势,在治疗1年时平均升高42个／μl。而CD8^ 童贞细胞（CD45RA＋CD62L＋）数平均升高19个/μl。所有患者用药后出现消化道反应,3例出现一过性黄疸,2例出现泌尿系结石。结论 与国外临床报道的治疗效果相一致,15例HIV－1不同阶段感染者经治疗后病毒载量水平明显降低,CD4平均细胞数有所增加,在具有不同病毒基因亚型的病例显示同样的治疗效果。     

Experimental quantum coding against qubit loss error

The fundamental unit for quantum computing is the qubit, an isolated, controllable two-level system. However, for many proposed quantum computer architectures, especially photonic systems, the qubits can be lost or can leak out of the desired two-level systems, posing a significant obstacle for practical quantum computation. Here, we experimentally demonstrate, both in the quantum circuit model and in the one-way quantum computer model, the smallest nontrivial quantum codes to tackle this problem. In the experiment, we encode single-qubit input states into highly entangled multiparticle code words, and we test their ability to protect encoded quantum information from detected 1-qubit loss error. Our results prove in-principle the feasibility of overcoming the qubit loss error by quantum codes.     

弓形虫感染对雄性小鼠睾丸细胞周期影响的实验研究

目的　研究弓形虫感染对雄性小鼠睾丸组织细胞周期的影响。方法　应用流式细胞术检测弓形虫感染10 3/ ml、10 4 / ml、10 6 / ml3个剂量组小鼠睾丸组织细胞周期,并设立生理盐水和环磷酰胺对照组。结果　不同剂量的弓形虫感染均可使小鼠睾丸组织细胞各时相的细胞百分数发生变化,并随着剂量的增加,G0 / G1 、S时相的细胞百分数明显减少,与阴性对照组比较差异有显著性(P<0 .0 5 )。G2 / M时相的细胞百分数逐渐增多,各剂量组与阴性对照组比较差异有显著性(P<0 .0 5 )。结论　弓形虫感染可能抑制小鼠睾丸细胞的DNA合成,可引起G2 期细胞阻滞,从而使细胞的有丝分裂延伸。     

Age-dependent cardiomyopathy and heart failure phenotype in mice overexpressing beta(2)-adrenergic receptors in the heart

OBJECTIVE: To explore long-term cardiac phenotype in transgenic (TG) mice with 300-fold overexpression of beta(2)-adrenergic receptors (AR). METHODS: Echocardiography was performed serially on a cohort of wild-type and TG mice (n=26 each) between 4 and 15 months of age. Survival was monitored and autopsy and histological examinations were performed. RESULTS: Heart rate was higher in TG than in wild-type mice throughout the study period. The left ventricular dimensions and fractional shortening were similar between TG and wild-type groups during 4-6 months. Starting at 9 months, however, TG mice showed progressive reduction in fractional shortening and systolic wall thickening, and increase in left ventricular dimensions and left ventricular mass, indicating onset of heart failure, left ventricular hypertrophy and remodeling. Abnormal waveforms in the electrocardiogram and episodes of ventricular ectopic beats were also observed in TG mice. Death of TG mice started at 8.5 months, and the cumulative mortality was 81% by 15 months (P<0.0001 vs. 4% in wild-type mice). The majority of deaths were due to severe heart failure, indicated by cardiac dilatation, lung congestion, pleural effusion and atrial thrombus. Left ventricular sections showed widespread interstitial fibrosis, loss of myocytes and myocyte hypertrophy in TG mice. CONCLUSIONS: A high level of beta(2)AR overexpression results in cardiomyopathy and heart failure. The onset was slower and the expression levels of receptors required are much higher than previously described for the beta(1)AR overexpression.     

叶酸和维生素B类降低同型半胱氨酸能预防缺血性卒中吗?

流行病学证据表明,高同型半胱氨酸血症(HHcy)是缺血性卒中的重要危险因素,但这些证据并未得到随机对照试验证实,因此对HHcy是缺血性卒中的独立危险因素,还是缺血性卒中后的附带现象,目前仍有争议。进一步用叶酸和维生素B类降低同型半胱氨酸,是否能作为缺血性卒中的预防措施,意见也不一致。     

Down-modulation of heat shock protein 70 and up-modulation of Caspase-3 during schisandrin B-induced apoptosis in human hepatoma SMMC-7721 cells

AIM: To investigate the effect of schisandrin B (Sch B) on proliferation and apoptosis of human hepatoma SMMC-7721 cells in vitro and regulation of Hsp70 and Caspases-3, 7, 9 expression by Sch B. METHODS: Human hepatoma cell line SMMC-7721 was cultured and treated with Sch B at various concentrations. Growth suppression was detected with MTT colorimetric assay. Cell apoptosis was confirmed by DNA ladder detection and flow cytometric analysis. The expression of Hsp70, Caspases-3, 7, 9 were analyzed by Western blot analysis. RESULTS: Sch B inhibited the growth of hepatoma SMMC-7721 cells in a dose-dependent manner, leading to a 50% decrease in cell number (LC50) value of 23.50 mg/L. Treatment with Sch B resulted in degradation of chromosomal DNA into small internucleosomal fragments, evidenced by the formation of a 180-200 bp DNA ladder on agarose gels. FCM analysis showed the peak areas of subdiploid at the increased concentration of Sch B. The results of Western bolt analysis showed that Hsp70 was down-regulated and Caspase-3 was up-regulated, while the activity of Caspases-7, -9 had no significant change. CONCLUSION: Sch B is able to inhibit the proliferation of human hepatoma SMMC-7721 cells and induce apoptosis, which goes through Caspase-3-dependent and Caspase-9-independent pathway accompanied with the down-regulation of Hsp70 protein expression at an early event.