MCP-1在小型猪慢性阻塞性胰腺炎组织中的表达及其意义

目的 检测慢性阻塞性胰腺炎小型猪血单核细胞趋化蛋白-1(MCP-1)含量及胰腺组织MCP-1蛋白表达,探讨其在胰腺纤维化中的作用.方法 采用不全结扎主胰管方法建立小型猪慢性阻塞性胰腺炎模型,术后4、6、8 周分批处死动物.观察胰腺病理变化;胶原(VG)染色评估胰腺纤维化程度;ELISA法检测血MCP-1浓度;免疫组化法检测胰腺组织MCP-1、α-SMA、PDGF、TGF-β1和NF-κB表达.结果 造模成功14头(58.3%).术后4周起胰腺体尾部呈萎缩性改变,间质纤维组织增生,炎细胞浸润,第8周改变最明显.胰腺纤维化Ⅰ期5头(35.7%),Ⅱ期4头(28.6%),Ⅲ期5头(35.7%).术后4、6、8周造模成功组血MCP-1含量分别为(102.44±36.25)pg/m1、(97.84±28.67)pg/ml、(94.32±28.42)pg/ml,显著高于对照组的(10.42±5.86)pg/ml、(8.58±4.86)pg/ml、(8.22±4.58)pg/ml(P值均＜0.01).对照组胰腺无MCP-1蛋白表达,造模成功组胰腺组织内见MCP-1蛋白表达,且MCP-1表达与α-SMA、PDGF、TGF-β1和NF-κB表达呈正相关.结论 MCP-1在慢性阻塞性胰腺炎胰腺纤维化过程中起重要作用.     

糖尿病人群中胰岛素和游离脂肪酸水平的相关性研究

目的探讨糖尿病人群中胰岛素和游离脂肪酸水平的相关性。方法选取2009年1月至2014年8月成都市第四人民医院就诊的2型糖尿病患者及同期门诊体检的健康人群,观察比较各人群各项生化指标。结果 2组人群生化特征比较,其中体质量指数、空腹血糖、餐后2h血糖、空腹血清胰岛素(FINS)、三酰甘油、高密度脂蛋白胆固醇、游离脂肪酸(FFA)、胰岛素敏感指数(IAI)差异有统计学意义(P0.05);糖尿病组中FINS与FFA呈正相关(r=0.678,P0.05),IAI与FFA呈负相关(r=-0.654,P0.05)。健康组FINS与FFA呈正相关,相关系数为0.447(P0.05)。结论糖尿病人群血清FFA升高,胰岛素分泌增加,IAI下降,而健康人群血清FFA升高与胰岛素分泌增加有关。     

甲氧西林耐药／敏感金黄色葡萄球菌基因分型和毒力基因检测

目的：分析耐甲氧西林金黄色葡萄球菌（金葡菌）（MRSA）和甲氧西林敏感金葡菌（MSSA）临床分离株基因分型及毒力基因分布特征是否存在差异,了解金葡菌耐药性演变与毒力变迁之间的相关性。方法采用脉冲场凝胶电泳（PFGE）方法和多位点序列分型（MLST）方法对呼和浩特地区住院患者中分离的30株 MRSA 和30株 MSSA 进行分子分型,同步采用聚合酶链反应（PCR）方法检测菌株毒力基因。结果60株金葡菌 PFGE 分型共分19个型,MSSA 菌株分布在 I 和 H 型等16个基因型中,而 MRSA 株主要集中分布在 K 和 M 2个基因型中。20株不同 PFGE 型菌株 MLST 分型结果显示,MRSA 株主要为 ST-239型;MSSA 株呈多样性分布特征,主要以 ST-5型、ST-7型、ST-15型为主。毒力基因在 MRSA 和 MSSA 中分布差异显著。MSSA 毒力基因整体携带率明显高于 MRSA（53．9％对40．0％,χ2＝32．7,P ＜0．01）。MRSA 株 sea、cna 和 cap 8基因携带率明显高于 MSSA 携带率（P ＜0．01）,而 sec、seg 、sei、sem、sen、seo、fnbB、ebpS、cap5基因携带率明显低于 MSSA（P＜0．05）。结论呼和浩特地区金葡菌临床分离株基因型呈现多样化分布特点,MRSA 主要以 ST-239型为主。MSSA 毒力基因携带率高,特定毒力因子在 MRSA 和 MSSA 株中呈现一定聚集分布特征,金葡菌特定耐药性的获得可能伴随特定毒力特征的变化。     

白藜芦醇保护缺血再灌注大鼠心肌作用与miR-21的相关性

目的 观察白藜芦醇预处理后大鼠心肌微小RNA(miRNA)的表达变化,分析白藜芦醇介导的心肌保护作用与miR-21之间有否关系.方法 通过miRNA芯片微阵列方法和qRT-PCR检测并验证白藜芦醇灌胃预处理后的大鼠心肌miRNA表达谱；建立大鼠心肌缺血再灌注损伤模型,检测各组心肌梗死面积、心肌细胞凋亡率以及miR-21的表达水平.结果 白藜芦醇预处理后,大鼠心肌的miR-21表达水平约为对照组的2.5倍;miR-21阻逼剂对白藜芦醇预处理引起的miR-21高表达产生了明显的抑制作用；过表达的miR-21显著降低了心肌细胞凋亡率,心肌组织梗死面积明显缩小.结论 白藜芦醇可以调控心肌多种miRNA的表达水平,通过促进miR-21的表达,白藜芦醇能够抑制心肌细胞的凋亡,从而减轻缺血再灌注对心肌的损伤.     

Percutaneous ultrasound and endoscopic ultrasound-guided biopsy of solid pancreatic lesions: An analysis of 1074 lesions

Backgrounds: Percutaneous ultrasound (US) and endoscopic ultrasound (EUS)-guided pancreatic biopsies are widely accepted in the diagnosis of pancreatic diseases. Studies comparing the diagnostic performance of US- and EUS-guided pancreatic biopsies are lacking. This study aimed to evaluate and compare the diagnostic yields of US- and EUS-guided pancreatic biopsies and identify the risk factors for inconclusive biopsies. Methods: Of the 1074 solid pancreatic lesions diagnosed from January 2017 to February 2021 in our center, 275 underwent EUS-guided fine needle aspiration (EUS-FNA), and 799 underwent US-guided core needle biopsy (US-CNB/FNA). The outcomes were inconclusive pathological biopsy, diagnostic accuracy and the need for repeat biopsy. All of the included factors and diagnostic performances of both US-CNB/FNA and EUS-FNA were compared, and the independent predictors for the study outcomes were identified. Results: The diagnostic accuracy was 89.8% for EUS-FNA and 95.2% for US-CNB/FNA ( P = 0.001). Biopsy under EUS guidance [odds ratio (OR) = 1.808, 95% confidence interval (CI): 1.083-3.019; P = 0.024], lesion size < 2 cm (OR = 2.069, 95% CI: 1.145-3.737; P = 0.016), hypoechoic appearance (OR = 0.274, 95% CI: 0.097-0.775; P = 0.015) and non-pancreatic ductal adenocarcinoma carcinoma (PDAC) diagnosis (OR = 2.637, 95% CI: 1.563-4.449; P < 0.001) were identified as factors associated with inconclusive pathological biopsy. Hypoechoic appearance (OR = 0.236, 95% CI: 0.064-0.869; P = 0.030), lesions in the uncinate process of the pancreas (OR = 3.506, 95% CI: 1.831-6.713; P < 0.001) and non-PDAC diagnosis (OR = 2.622, 95% CI: 1.278-5.377; P = 0.009) were independent predictors for repeat biopsy. Biopsy under EUS guidance (OR = 2.024, 95% CI: 1.195-3.429; P = 0.009), lesions in the uncinate process of the pancreas (OR = 1.776, 95% CI: 1.014-3.108; P = 0.044) and hypoechoic appearance (OR = 0.127, 95% CI: 0.047-0.347; P < 0.001) were associated with diagnostic accuracy. Conclusions: Both percutaneous US- and EUS-guided biopsies of solid pancreatic lesions are safe and effective; though the diagnostic accuracy of EUS-FNA is inferior to US-CNB/FNA. A tailored pancreatic biopsy should be considered a part of the management algorithm for the diagnosis of solid pancreatic disease.