急性一氧化碳中毒大鼠血小板活性的变化及其高压氧暴露的影响

目的观察急性一氧化碳中毒(ACOP)大鼠血小板活性的变化及其高压氧(HBO)暴露的影响。方法将实验动物Wistar大鼠共128只随机分成正常对照组(NC组)、一氧化碳中毒组(COP组)、一氧化碳中毒+高气压组(HPT组)及一氧化碳中毒+高压氧组(HBO组)。测定COP后1,5,10,15,20d大鼠血小板平均相对体积及血小板CD61的动态变化。结果COP后,血小板平均相对体积及血小板CD61的表达均显著升高(P<0.05),而且持续15d以上。HBO组较COP组血小板平均相对体积及血小板CD61的表达较快恢复正常(P<0.05)。HPT组与COP组相比高气压对血小板平均相对体积及血小板CD61的表达均无显著影响(P>0.05)。结论ACOP可导致血小板活性增加并持续。HBO治疗可以使其较快恢复正常。     

Enhanced immune responses to E2 protein and DNA formulated with ISA 61 VG administered as a DNA prime–protein boost regimen against bovine viral diarrhea virus

The aim of this study was to develop and test an optimal vaccination strategy against bovine viral diarrhea virus (BVDV) based on the E2 glycoprotein of the BJ1305 strain. To achieve higher E2-specific antibody titers and to broaden the cellular immune response, a plasmid encoding the E2 protein (pcDNA3.1-E2) was constructed and a purified recombinant E2 protein was generated. The E2 protein was emulsified in the adjuvant ISA 61 VG prior to administration. We immunized mice three times with pcDNA3.1-E2 or the recombinant E2 protein or primed twice with pcDNA3.1-E2 and boosted once with the E2 protein. To evaluate the protection against BVDV conferred by the vaccines, the mice were challenged with BVDV strain Oregon C24V after the third immunization. Although all immunized mice developed humoral and cellular immune responses, the E2-specific antibody titers in the DNA prime–protein boost group were significantly higher than those elicited by either the DNA or the protein vaccine. In addition, vaccination with the E2 DNA vaccine induced higher percentages of CD4⁺IFN-γ⁺ T cells and CD8⁺IFN-γ⁺ T cells among total CD3⁺ T cells than the other regimens. The predominant antibody subclass in the vaccinated mice was IgG1. Serum tumor necrosis factor alpha (TNF-α) levels in the DNA prime–protein boost group were significantly higher after the third immunization than in the other groups. Moreover, the mice treated with the DNA prime–protein boost vaccination regimen acquired protection against BVDV challenge, as shown by a significant reduction of viremia, only minor pathological changes, and a lower viral antigen burden than in the control and solo vaccinated mice. These results demonstrate the potential advantage of a DNA prime–protein boost vaccination approach over a solo vaccination for the prevention of BVDV. The ability of this vaccine strategy to control and eradicate BVD in herds warrants further investigation.     

老年高血压肾病血小板活化分子检测的意义

目的 :评估血小板在老年高血压肾病中的活化状态及意义。方法 :利用流式细胞仪检测了 64例老年高血压肾病患者及 2 1例健康自愿者外周血小板的膜糖蛋白CD62P、CD63、CD 41和CD61的表达。结果 :老年高血压肾病组CD62P、CD63的表达较对照组显著增高 (P <0 0 0 1) ,CD41和CD61的表达与对照组比较差异无显著性(P >0 0 5 )。老年高血压肾病组CD62P、CD63的表达组间差异有显著性 (P <0 0 5 ) ,且随血压分级水平升高而递增。结论 :老年高血压肾病时血小板活化增强 ,推测其在老年高血压肾病发生发展中起重要作用。     

血小板膜糖蛋白Ⅱb/Ⅲa测定在诊断血小板无力症中的应用

目的:探讨流式细胞术测定血小板膜糖蛋白Ⅱb/Ⅲa(CD41/CD61)及其在血小板无力症(GT)诊断中的初步应用。方法:以流式细胞术结合免疫荧光标记法检测血小板CD41和CD61的阳性百分率,观察30例正常人、1例血小板无力症疑似患者及其父母的血浆CD41和CD61的阳性表达率。结果:正常人血浆阳性表达率CD41和CD61的均值分别为93·10%和93·87%;患者、患者父亲和母亲CD41、CD61阳性表达率分别为0·02%、0·06%;97·4%、96·6%和98·1%、96·8%。结论:用流式细胞仪测定CD41和CD61的阳性表达率是检测GPⅡb/Ⅲa的可靠方法,可用于临床血小板无力症的诊断。     

Epicardial Adipose Tissue Is Associated With Left Atrial Dysfunction in People Without Obstructive Coronary Artery Disease or Atrial Fibrillation

Background

Epicardial adipose tissue (EAT) is a metabolically active visceral fat depot. Although EAT volume is associated with the incidence and burden of atrial fibrillation (AF), its role in subclinical left atrial (LA) dysfunction is unclear. This study aims to evaluate the relationships between EAT volumes, LA function, and LA global longitudinal strain.

Production of Cu using natural cobalt target and its separation using ascorbic acid and common anion exchange resin

⁶¹Cu was produced by ^natCo(α, xn)⁶¹Cu reaction. ⁶¹Cu production yield was 89.5 MBq/μAh (2.42 mCi/μAh) at the end of irradiation (EOI). A simple radiochemical separation method using anion exchange resin and ascorbic acid has been employed to separate the product radionuclide from inactive target material and co-produced non-isotopic impurities. The radiochemical separation yield was about 90%. Radiochemical purity of ⁶¹Cu was >99% 1 h after EOI. Final product was suitable for making complex with N₂S₂ type of ligands.     

Use of a glucose controlled insulin infusion system (artificial beta cell) to control diabetes during surgery

Summary An artificial beta cell has been used to achieve and maintain a preset plasma glucose concentration in five diabetic patients undergoing surgery. These subjects were compared to control groups of normal subjects receiving either saline or glucose, and diabetics receiving glucose intraoperatively. Hyperglycaemia during surgery was seen in normals (mean plasma glucose ± SEM: 185±16 mg/dl) and, to a greater degree, diabetics (247±36 mg/dl) receiving glucose. Insulin and C-peptide levels did not increase during 2 hours of operation in any of the control groups, suggesting beta cell suppression during surgery. As C-peptide levels declined similarly in normal subjects whether they received saline or glucose, the hyperglycaemia seems to be due to an inability to use exogenous glucose. This is confirmed by a correlation of maximal plasma glucose to glucose infusion rate (r = 0.78, p<0.01). The artificial beta cell was able to achieve the same plasma glucose after 2 hours of operation (128±21 mg/dl) as normal subjects receiving saline (110±7 mg/dl). The artificial beta cell proved to be a safe, convenient and effective way of monitoring and controlling the hyperglycaemia seen in diabetic patients undergoing surgery.