BMI型双腔可卷式主动咏内气囊(IAB)的研究

本文报道了BMI型双腔,可卷式主动咏内气囊(IAB)的研究。这种新型IAB的结构是由卷子,双腔导管和气囊三部分组成。通过体外频率响应试验,静态破坏性实验,动态疲劳试验及一系列的动物实验结果证明,BMI型双腔可卷经皮穿刺插入式IAB具有先进的结构,安全可靠的机械性能,良好的血液动力学反搏效果,适于临床使用。     

小檗碱对早期ACM大鼠治疗效果及机制的研究

目的:观察小檗碱(BBR)对早期酒精性心肌病(ACM)大鼠的治疗作用,探讨其作用机制。方法:每日白酒灌胃以建立SD大鼠早期ACM模型,将已建模成功的28只SD大鼠随机分为小檗碱治疗组(14只)、安慰剂组(14只),并随机抽取10只正常SD大鼠作为正常对照组。干预4周后应用超声心动图测定两组大鼠心脏结构及功能参数,RT-PCR法检测心肌组织中MMP-2mRNA、TIMP-2 mRNA表达。结果:与对照组比较,安慰剂组LVEDD、LVESD、LA增大,左室舒张功能减低,心肌组织中的MMP-2 mRNA表达水平明显上升,TIMP-2mRNA表达水平下降,差异有统计学意义(P<0.05);与安慰剂比较,小檗碱组LVEDD、LVESD、LA减小,左室舒张功能有所改善,心肌组织中的MMP-2 mRNA表达水平显著下降,TIMP-2 mRNA表达显著升高(P<0.05)。结论:BBR逆转早期ACM大鼠心室重构,改善心功能,可能与减少心肌组织MMP-2表达有关。     

Isolation and Purification of a New Bacillus Subtilis Strain from Deer Dung with Anti-microbial and Anti-cancer Activities

Objective:Bacillus strains are well known for their natural bioactive products that have antimicrobial and/or anti-cancer activities.Many of Bacillus'structural...     

去肾交感神经术对自发性高血压大鼠肾胺酶及酪氨酸羟化酶的影响

目的:通过观察自发性高血压大鼠（SHR）去肾交感神经手术前后血压、肾胺酶浓度、肾脏酪氨酸羟化酶（TH）与肾胺酶表达水平的变化,探讨去肾交感神经术降低血压的可能机制。方法:将SHR 大鼠（n=48）随机分为基线组、手术组、假手术组和对照组,同批同周龄WKY 大鼠（n=12）作为基线对照组,同条件喂养至12 周龄测各组血压,首批处死SHR 基线组、WKY 组,采血、取肾脏组织送检;手术组、假手术组与对照组继续监测血压,于去肾交感神经术后1,6 周时分批处死每组大鼠各6 只,分别采血、取肾脏组织送检。采用ELISA 方法测定血浆肾胺酶浓度,Western 印迹测定肾脏TH、肾胺酶蛋白表达水平。结果:与WKY 组大鼠比较,SHR 基线组大鼠血压、肾脏TH 蛋白表达水平明显升高（P<0.05),血浆肾胺酶浓度及蛋白表达水平明显下降(P<0.05);术后1 周,手术组大鼠平均动脉压与TH 蛋白表达水平较基线组明显降低且明显低于假手术组及对照组(P<0.05),手术组肾胺酶水平较基线组明显增高并明显高于假手术组及对照组(P<0.05);术后6 周,手术组平均动脉压与TH 水平较术后1 周上升而肾胺酶浓度及水平较术后1 周降低,较基线组、假手术组与对照组差异无统计学意义(P>0.05);假手术组与对照组较基线组各项指标差异无统计学意义(P>0.05)。结论:去肾交感神经术降低血压的作用可能与其抑制交感神经,升高肾胺酶浓度及其蛋白表达水平有关。     

Chidamide stacked in magnetic polypyrrole nano-composites counter thermotolerance and metastasis for visualized cancer photothermal therapy

Photothermal therapy (PTT) has become one of the most promising therapies in cancer treatment as its noninvasiveness, high selectivity, and favorable compliance in clinic. However, tumor thermotolerance and distal metastasis reduce its efficacy, becoming the bottleneck of applying PTT in clinic. In this study, a chidamide-loaded magnetic polypyrrole nanocomposite (CMPP) has been fabricated as a visualized cancer photothermal agent (PTA) to counter tumor thermotolerance and metastasis. The efficacy of CMPP was characterized by in vitro and in vivo assays. As a result, this kind of magnetic polypyrrole nanocomposites were black spherical nanoparticles, possessing a favorable photothermal effect and the suitable particle size of 176.97 ± 1.45 nm with a chidamide loading rate of 12.92 ± 0.45%. Besides, comparing with PTT, CMPP exhibited significantly higher cytotoxicity and cellular apoptosis rate in two tumor cell lines (B16-F10 and HepG2). In vivo study, the mice showed obvious near-infrared (NIR) and magnetic resonance imaging (MRI) dual-modal imaging at tumor sites and sentinel lymph nodes (SLNs); on the other hand, magnetic targeting guided CMPP achieved a cure level on melanoma-bearing mice through preventing metastasis and thermotolerance. Overall, with high loading efficiency of chidamide and strong magnetic targeting to tumor sites and SLNs, CMPP could significantly raise efficiency of PTT by targeting tumor thermotolerance and metastasis, and this strategy may be exploited therapeutically to upgrade PTT with MPP as one of appropriate carriers for histone deacetylase inhibitors (HDACis).     

Protective effect of glutamine-enriched early enteral nutrition on intestinal mucosal barrier injury after liver transplantation in rats

Background

The effect of glutamine-enriched early enteral nutrition (Gln-EEN) on intestinal mucosal barrier injury after liver transplantation (LT) remains uncertain.

Methods

The Wistar-to-Wistar rat LT model was used to explore the protective effect of Gln-EEN. Morphologic changes of intestinal mucosa, levels of intestinal malondialdehyde and secretory immunoglobulin (sIgA), plasma endotoxin, D-lactic acid, serum tumor necrosis factor-α (TNF-α), rates of bacterial translocation, and expression of intestinal nuclear factor-κB, TNF-α, and intercellular adhesion molecule-1 were determined.

Results

After LT, intestinal mucosa was damaged seriously. At 12, 24, and 48 hours posttransplantation, levels of intestinal sIgA were decreased; levels of malondialdehyde, endotoxin, D-lactic acid, and TNF-α, the ratio of bacterial translocation, and the expression of intestinal nuclear factor-κB, TNF-α, and intercellular adhesion molecule-1 all were increased. However, changes in earlier-mentioned parameters in recipients treated with Gln-EEN were attenuated remarkably at 24 to 48 hours.

Conclusions

Our data show that Gln-EEN is a potent protectant against intestinal mucosal barrier injury after LT.     

不同nPCL/HA电纺纤维薄膜对人骨髓间充质干细胞黏附率的影响

目的：观察nPCL/HA电纺纤维取向薄膜材料对人骨髓间充质干细胞（hBMSCs）的黏附生长的影响,评价其作为组织工程支架材料的应用前景。方法：将体外诱导培养的人骨髓间充质干细胞（hBMSCs）,经传代培养第5代的人骨髓间充质干细胞,以2×105的密度与不同nPCL/HA电纺纤维取向薄膜支架在培养板内共培养,同时以nPCL电纺纤维非取向薄膜材料作为对照,初步观察不同nPCL/HA支架材料与hBMSCs的复合培养情况,计算各材料的细胞黏附率。结果：hBMSCs与4种电纺薄膜支架材料均有良好的细胞相容性,细胞能在不同材料表面黏附生长。但是nPCL/80℃HA电纺纤维取向薄膜材料黏附率（45.6±3.2）%,明显高于nPCL/180℃HA电纺纤维取向薄膜材料黏附率（36.5±3.0）%。结论：80℃条件下合成的nPCL/HA电纺取向薄膜材料细胞黏附率较高,较适合作为支架材料应用于hBMSCs为种子细胞的组织工程构建。     

Pregnancy outcomes in women with type 1 diabetes in China during 2004 to 2014: A retrospective study (the CARNATION Study)

BackgroundWe aimed to report pregnancy outcomes of women with type 1 diabetes (T1D) in China, on which data were sparse.MethodsThis is a nationwide retrospective study conducted in 11 general medical centers in 8 cities across China. We investigated the clinical data of all women who attended these centers with a singleton pregnancy and whose pregnancy ended between 1 January 2004 and 31 December 2014. Pregnancies of women with pregestational T1D were ascertained and compared with those of women without T1D.ResultsFrom over 300 000 pregnancies over the 11‐year study period, we identified 265 singleton pregnancies of women with T1D. One maternal death was documented among 265 (0.37%) women with T1D and 83 among 318 486 (0.03%) women without T1D. Women with T1D suffered from higher rates of pregnancy loss (13.21% vs 2.92%, crude risk ratio [cRR] 5.08 [95% CI, 3.56‐7.26]) and preeclampsia (17.74% vs 4.20%, cRR 4.94 [95% CI, 3.60‐6.77]) compared with those without T1D. Infants of these women with T1D had elevated rates of neonatal death (5.65% vs 0.16%, cRR 37.36 [95% CI, 21.21‐65.82]) and congenital malformation(s) (8.26% vs 3.53%, cRR 2.46 [95% CI, 1.54‐3.93]) compared with those of women without T1D. No significant improvement in pregnancy outcomes in women with T1D was observed over the period 2004 to 2014.ConclusionsPregnancy outcomes were persistently poor in women with T1D during 2004 to 2014 in China. Pregnancy care needs to be improved to reduce adverse pregnancy outcomes among Chinese women with T1D.     

Clinical characteristics of patients with chronic eosinophilic pneumonia in a Chinese tertiary‐care hospital: A 6‐year retrospective study

IntroductionChronic eosinophilic pneumonia (CEP) is a rare disease with unknown etiology. Due to lack of specificity of CEP symptoms, clinicians are not experienced in establishing its diagnosis.ObjectivesTo summarize the clinical data of CEP patients to improve the understanding of CEP and reduce misdiagnosis.MethodsData of patients pathologically diagnosed with CEP in the PLA General Hospital between May 2013 and May 2019 were collected, and clinical manifestations, imaging characteristics, pathological features, and treatment were retrospectively analyzed.ResultsTwenty patients, including 6 males and 14 females, were diagnosed with CEP. The average age was 47.0 ± 10.2 years. The main clinical manifestations were cough and dyspnea. The average duration of CEP was 15.5 ± 11.5 months. The average proportion of eosinophils in the peripheral blood was 18.9 ± 17.8%, and the average proportion of eosinophils in the bronchoalveolar lavage fluid was 41.5 ± 19.4%. The main imaging features were patchy shadows and consolidation shadows. The most common manifestations on bronchoscopic examination were congestion and edema of the bronchial mucosa. Two patients had granular protrusions of the endotracheal membrane. Histological examination indicated infiltration of numerous eosinophils. All patients improved after prednisone therapy.ConclusionCEP onset is insidious, and clinical manifestations lack specificity. Typical imaging features are peripheral and subpleural distribution of lung infiltrates. Some patients have a normal proportion of eosinophils in the peripheral blood, but most have an increased number of eosinophils in the BALF, which contributes to CEP diagnosis. A biopsy is necessary when differential diagnosis is difficult. A systemic glucocorticoid is effective.