Two immunogenic recombinant protein vaccine candidates showed disparate protective efficacy against Zika virus infection in rhesus macaques

Zika virus (ZIKV) infection has caused major public health problems recently. To develop subunit vaccines for ZIKV, we have previously constructed recombinant ZIKV envelope protein domain III (EDIII), and the entire ectodomain (E80, which comprises EDI, EDII and EDIII), as vaccine candidates and showed both of them being immunogenic and protective in murine models. In this follow-up study, we compared these vaccine candidates in non-human primates. Both of them elicited neutralizing antibody responses, but only E80 immunization inhibited ZIKV infection in both peripheral blood and monkey tissues, whereas EDIII increased blood ZIKV RNA through possibly antibody-dependent enhancement. Further investigations revealed that the virion-binding antibody response in E80 immunized monkeys persisted longer and stronger than in EDIII immunized monkeys. These results demonstrate that E80 is superior to EDIII as a vaccine candidate, and that the magnitude, quality and durability of virion-binding neutralizing antibodies are correlates of protection.     

经阴道超声在早孕期流产后宫腔残留物诊断中的应用价值

目的探讨经阴道超声在早孕期流产后宫腔残留物诊断中的应用价值。方法选取2018年1月至2020年1月医院收治的早孕期人工流产、自然流产及药物流产后行宫腔残留物诊断的患者80例,均采用经阴道超声检查,以病理结果为金标准,分析经阴道超声的诊断效能。结果以病理结果为金标准,经阴道超声对早孕期流产后宫腔残留物的诊断灵敏度为97.22%,特异度为62.50%,准确度为93.75%。结论经阴道超声应用于早孕期流产后宫腔残留物诊断中,具有较高的诊断灵敏度、准确度,可为临床治疗提供依据。     

乳腺肿瘤的影像学诊断进展

乳腺肿瘤属女性的常见病之一,且乳腺恶性肿瘤患者的病死率较高。随着医疗技术水平的不断提升,超声、X线等影像学技术已被广泛应用于乳腺肿瘤的诊断中,尤其是MRI、核医学等新技术在乳腺肿瘤的早期诊断中具有较好的应用效果。该研究对乳腺肿瘤的影像学诊断进展进行综述。     

脂肪间充质干细胞向髓核样细胞定向分化研究

目的探讨SD大鼠来源的髓核(nucleus pulposus,NP)细胞促使脂肪间充质干细胞(adipose tissue-derived mesenchymal stem cells,AMSCs)向NP样细胞定向分化的分子机制。方法采用酶消化法取脂肪细胞,极限稀释法纯化细胞;采用组织块培养法培养NP细胞。利用流式细胞技术,免疫荧光及RT-PCR检测对AMSCs及NP细胞进行鉴定。结果 AMSCs中Sca-1和CD44的阳性率较高,而CD45和CD11b阴性,共培养组荧光强度明显亮于单纯AMSCs组,AMSCs在NP细胞的诱导下聚焦蛋白聚糖(Aggrecan)、Ⅱ型胶原蛋白(CollagenⅡ)、Sox-9等表达水平较对照组高。结论共培养环境中髓核细胞分泌的可溶性因子TGF-1能促使AMSCs向NP样细胞定向分化。     

尿毒症患者急性缺氧状态下血清红细胞生成素浓度的变化

７例尿毒症贫血患者在自发急性缺氧状态下，其血清红细胞生成素（ＥＰＯ）浓度显著提高（平均７倍），且与ＰＯ２呈负相关。缺氧状态纠正后血清ＥＰＯ浓度下降。提示尿毒症贫血患者的ＥＰＯ氧依赖调控系统功能尚存在，但处于不敏感的低调状态。进一步了解其机遇，则可能通过促进内源性ＥＰＯ的生成，有助于悄毒症贫血的治疗。     

前列腺癌与增生性病变的流式细胞分析

应用流式细胞分析术（ＦＣＭ）对２０例前列腺癌（ＰＣ）和１５例良性前列腺组织作了ＤＮＡ含量检测，着重分析了ＰＣ及增生性病变的细胞增殖指数（ＰＩ）与ＤＮＡ指数（ＤＩ）。结果表明在良恶性前列腺组织中有明显差异（Ｐ＜０．０１）。２０例ＰＣ的组织学分级与ＦＣＭ检测结果有关，ＰＣ－Ⅲ与ＰＣ１－Ⅰ、ＰＣ－Ⅱ与ＰＣ－Ⅰ、ＰＣ－Ⅲ与ＢＰＨ的ＰＩ、ＤＩ相差显著（Ｐ＜０．０１）。本研究结果提示良恶性前列腺病变的ＰＩ与ＤＩ能较客观地反应不同细胞的生物活性，并对分化低、分级高的ＰＣ的恶性程度判断及其预后的推测，以及癌前病变的分析有意义。     

干牛骨拉伸弹性模量沿径向的分布

本文研究了干牛胫骨骨干密质骨部分沿生长轴方向的拉伸弹性模量沿径向的分布，发现此弹性模量沿径向呈非均匀分布，内外两侧的弹性模量值低于中间部分；提出了一种骨内疲劳裂纹的分布假设，并据此对测试结果进行了初步性的分析。     

人胰岛微血管和A细胞的微机三维重建

采用微机辅助三维重建的方法重建了人胰岛的微血管的A细胞，结果表明，所使用的软件重建速度快，图像速真，清晰度高，视觉效果好，可对重建物体进行多角度，多轴旋转，也可进行任何部位的切割，以便能进一步了解胰岛内各结构的详细情况，为进一步研究胰岛内微血管和细胞的立体位置关系提供方法学基础。     

Duration of improved muscle glucose uptake after acute exercise in obese Zucker rats

Skeletal muscle is insulin resistant in the obese Zucker rat. Endurance training reduces muscle insulin resistance, but the effects of a single acute exercise session on muscle insulin resistance in the obese Zucker rat are unknown. Therefore, insulin responsiveness of muscle glucose uptake was measured in 15-week-old obese rats either 1, 48, or 72 hours after two hours of intermittent exercise (30:30 min; work:rest). Hindlimbs of sedentary lean (LS) and obese (OS) rats and exercised obese (OE) rats were perfused after a 10-hour fast under both basal (0 mU x ml(-1)) and maximal (20 mU x ml(-1)) insulin concentrations to measure net glucose uptake. Insulin responsiveness of net glucose uptake was significantly reduced in OS compared to LS (8.5 +/- 1.6 vs 15.3 +/- 2.0 micromol x g(-1) x h(-1), respectively). Compared to OS, insulin responsiveness of net glucose uptake was significantly increased by 56% and 80% at 1 hour and 48 hours after acute exercise. However, 72 hours after acute exercise, the increased insulin responsiveness of net glucose uptake was no longer evident. These results indicate that improved responsiveness of muscle glucose uptake persists for at least 48 hours after two hours of acute intermittent exercise in 15-week-old obese Zucker rats.