Screening Mouse Genes Related to Blastocyst Implantation by Using PCR Subtraction

Objective To identify genes that may be related to embryo implantation Materials & Methods The PCR subtraction technique was applied at implantation and inter-plantation sites on day 4. 5 of pregnancy in mice. Two novel Expressed Sequence Tags (ESTs ), EST8 and EST81 were identified; their expression in tissues was analyzed by Northern blotting, and their full-length cDNAs were synthesized by PCR.Results We found that these two novel ESTs (EST8and EST81) were noticeably expressed in implantation site in the mouse on day 4. 5 of pregnancy. EST8 was expressed at high level in livers and implantation sites of the mice, while at low level in ovaries and inter-plantation sites. EST81 was predominantly expressed in implantation site and ovary, and at low level in all other tissues. Their complete cDNAs, 1 665bp and 1 264 bp respectively, were synthesized by using PCR.Conclusion The two full-length cDNAs were responsible for embryo implantation,and their functions need to be further studied.     

CD14+单核细胞人类白细胞抗原DR表达率与脓毒症关系的研究

目的了解烧伤延迟复苏时CDl4^＋单核细胞人类白细胞抗原DR（HLA—DR）表达率的变化，分析其与脓毒症的关系。方法选择烧伤面积大于30％TBSA的25例烧伤延迟复苏患者，于伤后1、3、7、14、28d取外周血，其中7例患者住院期间并发脓毒症，于脓毒症发生后连续2d亦取其外周血。另取20例健康体检者外周血作为对照。流式细胞仪检测CD14^＋单核细胞HLA．DR表达率，酶联免疫吸附测定法检测血浆中肿瘤坏死因子α（TNF—α）、白细胞介素10（IL-10）的浓度。结果非脓毒症患者伤后1、3、7、14、28dCD14^＋单核细胞HLA—DR表达率分别为（15±6）％、（74±5）％、（264±17）％、（284-16）％、（474-16）％，明显低于健康体检者[（924±10）％，P〈0．01]；脓毒症患者发生脓毒症后1、2d，该指标亦明显低于健康体检者及非脓毒症患者伤后1、7、14、28d（P〈0．01）。脓毒症患者TNF—d检出率及TNF—α、IL-10浓度，均高于非脓毒症患者和健康体检者（P〈0．05或P〈0．01）。伤后1、7、28d，外周血CD14^＋单核细胞HLA—DR表达率与IL—10浓度呈显著负相关（r分别为-0．9963、-0．7459、-0．8474，P〈0．01）。结论烧伤延迟复苏患者免疫功能低下，促炎性介质释放量增加，并发脓毒症时则更为严重。外周血CD14^＋单核细胞HLA—DR表达率可作为动态检测患者免疫功能状态的有效指标。     

Establishment of Germ-line Competent C57BL/6J Embryonic Stem Cell Lines

Objective To establish C57BL/6J embryonic stem （ES） cell lines with potential germ- line contribution Methods ES cells were isolated from blastocyst inner cell mass of C5 7BL/6J mice, and cultured for 15 passages, and then injected into blastococels of ICR mice blastocysts to establish chimeric mice. Results Three ES cell lines （mC57ES1,mC57ES3, mC57ES7） derived from the inner cell mass of C57BL/6J mice blastocysts were established. They were characteristic of undifferentiated state, including normal XY karyotype, expression of a specific cell surface marker “stage-specific embryonic antigen-I” and alkaline phosphatase in continuous passage. When injected into immunodeficient mice, mC57ES1 cells consistently differentiated into derivatives of all three embryonic germ layers. When mC57ES1 cells were transferred into ICR mice blastocysts, 4 chimeric mice have been obtained. One male of them revealed successful germ-line transmission. Conclussion We have obtained C57BL/6J ES cell lines with a potential germ-line contribution, which can be used to generate transgenic and gene knock-out mice.     

长航人员肠道微生态平衡与疾病相关性研究进展

随着高通量测序技术的发展,越来越多的研究证实,肠道菌群与宿主共同进化,在维持机体免疫稳态中发挥重要作用。肠道菌群可以直接或通过代谢产物间接参与多种疾病的发生发展。研究人员根据肠道微生态与其他脏器间的相互关联,提出了“肠-脑轴”、“肠-肺轴”等学说,并在基础和临床研究领域得到广泛验证。长航人员容易发生肠道菌群紊乱,也经常出现其他健康问题。现阶段需积极开展相关研究,明确长航人员肠道菌群紊乱与健康状态的关系,探索合理的干预措施。维护肠道微生态平衡,对提高长航人员生活质量、预防疾病发生具有重要意义。     

小鼠胚泡着床相关基因的差减筛选

目的:筛选新的小鼠胚泡着床相关基因。方法:对孕4.5 d小鼠着床和非着床位点的子宫内膜组织进行PCR差减。获得了2个新的在小鼠胚泡着床位点高表达的EST(EST8和EST81)。结果:EST8在孕4.5 d小鼠着床位点、肝脏中表达较高,在非着床位点和卵巢中亦有微量表达。EST81主要在孕4.5 d小鼠子宫着床组织和卵巢中表达,其它各种组织中也有微量表达。用PCR方法获得了相应的全长。cDNA,长度分别为1665bp和1364bp。结论:用差减筛选获得的两种cDNA是孕小鼠着床相关基因,其功能有待进一步研究。     

卡巴胆碱对烧伤延迟复苏大鼠免疫功能的影响

Objective To explore the changing trend of Ia on monocyte, lymphocyte apoptosis rate, TNF-α and IL-6 in abdominal aorta of burned rats with delayed resuscitation and the influence of application of carbachol on them. Methods Adult male Wistar rats were randomly divided into normal control group(n =8), scald group(n =48) and scald with carbachol treatment group(n =48). In latter two groups, rats were inflicted with 30% total body surface area (TBSA) full-thickness scald and delayed fluid resuscitation. All scald rats were sacrificed at the 6th hours or 1st, 2nd, 3rd, 7th, 14th day after scald, with 8 rats at each time point. Expression of Ia antigen on monocyte and lymphocyte apoptosis rate were determined by direct immunofluorescence on a flow cytometer, and TNF-α and IL-6 was measured by ELISA. Results Expression of la on monocyte was obviously lower than that of controls. The lowest levels were recorded on the 6th hours and 1st day after scald. Subsequently, Ia was elevated gradually, but still lower than that of normal rats(P <0. 01). After administration of carbachol, Ia expression was obviously promoted, compared with the simple scald group (P <0. 01). Lymphocyte apoptosis rate, TNF-α and IL-6 was higher than that of controls(P <0. 01). After administration of cavachol, , lymphocyte apoptosis rate and TNF-α and IL-6 was obviously down-regulated on the 6th hours, 1st day, 2nd day and 3rd day after scald injury, compared with the simple scald group (P < 0. 01 or 0. 05). Conclusion After severe burn with delayed fluid resuscitation, there is a low la expression, high lymphocyte apoptosis rate and increased releasing of proinflammatory cytokine. Immune function was suppressed. Carbacho] could improve the immune function of scald rats with delayed fluid resuscitation.     

地震救援中实施远程医疗服务:把最好的医学专家送到灾区人民身边

目的和方法 总结解放军总医院远程医疗会诊系统在2013年“4·20”四川芦山地震救援中发挥其远程医疗服务的经验,探讨远程医疗会诊系统在灾难救援中的作用.结果和结论 在2013年4月20日四川芦山地震后,解放军总医院专家医疗队及时将无线便携式远程医疗会诊系统发送至地震灾区伤员集合点医院,第一时间组织开通面向灾区服务的远程医疗会诊系统,与位于地震灾区的多家医院及地震救援队救护车远程医疗系统联通,提供24h包括急诊和危重症救治、骨科、脑外科、肝胆外科、妇产科等相关专业的远程救援服务,对地震伤员的抢救提出了诊断和救治意见,形成了救灾现场专家与后方专家的良性互动,使灾区专家医疗队的救治能力倍增.解放军总医院在芦山地震中共进行远程医疗会诊110余例,在对灾难现场的受伤人员进行有效的紧急救治中实现了实时高清会诊和现场手术指导,并在业务层面实现了多媒体通信系统与医院医疗信息系统的对接,在功能层面实现了各联盟医院的视频、音频和数据以及医疗业务的互联互通,为我国在灾难救援中实施远程医疗抢救提供了可借鉴的经验.     

碱性磷酸酶与白蛋白比值对急性冠脉综合征患者介入治疗预后的影响

目的评估碱性磷酸酶(ALP)与白蛋白(ALB)比值(APAR)对急性冠脉综合征(ACS)患者预后的影响。方法按前瞻队列研究连续入选2015年1月至2016年12月就诊于中国医科大学附属盛京医院确诊为ACS并择期进行经皮冠状动脉支架植入术(PCI)治疗的患者共2162例。根据入院次日APAR分成两组,收集所有患者临床资料、冠脉病变情况、术后用药以及随访1年记录临床终点事件。通过COX回归分析研究APAR水平对于ACS患者预后的影响。结果根据COX单因素分析,APAR值与ACS全因死亡率[HR(95%CI)2.432(1.475,4.010),P<0.001]和心源性死亡率[HR(95%CI)2.884(1.627,5.111),P<0.001]相关,多因素分析调整变量后,APAR值与ACS全因死亡率[HR(95%CI)1.839(1.059,3.192),P=0.03]及心源性死亡率[HR(95%CI)2.232(1.170,4.258),P=0.01]仍相关。APAR值与ACS患者临床预后的关系比ALP、ALB单独变量更为密切(曲线下面积:0.635、0.592、0.397)。结论APAR水平较高患者长期的全因死亡率及心源性死亡率更高,APAR可以作为预测ACS患者预后的独立危险因素。     

微小RNA调节骨骼肌发育与损伤修复的作用及其机制

microRNAs是一类非编码小RNAs分子,新近发现其具有重要的调节基因表达的功能,它能通过抑制翻译和降解靶mRNA来负性调控转录后水平的基因表达,miRNAs已经被证实在肌肉发育和肌细胞增殖和分化的调节中具有重要作用。最近研究发现,肌肉特异性转录因子控制一些microRNAs的表达,通过多种机制调节肌肉发育和功能。结合信息学、生物化学和遗传基因学方法,不仅将阐明骨骼肌microRNAs调控网络,更好地理解肌肉组织的调节,还将通过鉴定候选microRNAs的潜在临床应用靶点,增加肌肉营养不良的治疗干预的新机会。     

A Prospective,Randomized Comparison of Modified Pulmonary Vein Isolation Versus Conventional Pulmonary Vein Isolation in Patients with Paroxysmal Atrial Fibrillation

Modified Pulmonary Vein Isolation in AF Ablation. Introduction: Pulmonary vein isolation (PVI) is the primary ablation therapy in patients with atrial fibrillation (AF). We hypothesized that high dominant frequency (DF) sites (AF nests during sinus rhythm [SR]) adjacent to the PV ostia are associated with the atrial substrate that maintains AF, and PVI incorporating the high‐frequency AF nests may have a higher efficacy. Methods and Results: In a prospective and randomized comparison, 126 symptomatic paroxysmal AF patients that underwent PVI were enrolled. We compared the efficacy of a modified PVI (ablation line: 1.0–1.5 cm from the PV ostium with encircling the AF nests [spectral analysis with DF >70 Hz during SR, Group II]) versus the anatomy‐guided conventional PVI (Group I). In Group II, the DF value along the PV ostium was lower than 70 Hz after the PVI. The primary endpoint was the freedom from symptomatic atrial arrhythmias after a single procedure. We also followed the autonomic function by a time‐domain analysis of the heart rate variability. In both groups, AF nests were observed and electric isolation was successfully obtained in all patients. With a mean duration of 16 ± 6.1 months of follow‐up, Group II had a higher single procedure efficacy without drugs (78.7% vs 66.1%, log‐rank test: P = 0.02), and fewer repeat procedures (6.6% vs 23%; P = 0.04), as compared to Group I. Conclusion: PVI incorporating the high frequency AF nests adjacent to the PV ostia had a better single procedure efficacy. (J Cardiovasc Electrophysiol, Vol. 23, pp. 1155–1162, November 2012)