急性胰腺炎大鼠血浆内皮素和一氧化氮水平变化及卡托普利的早期干预作用

目的 观察急性胰腺炎大鼠血浆内皮素、一氧化氮水平变化及血管紧张素转换酶抑制剂卡托普利对其的早期干预作用。方法 63只SD大鼠分对照组、急性胰腺炎组、卡托普利干预组3组进行不同处理。对照组仅作胃窦切开再缝合术；急性胰腺炎组用十二指肠闭襻法制作急性胰腺炎模型；卡托普利干预组在胰腺炎模型制备后立即腹腔注射卡托普利针(5mg／kg)，在病程不同时点测定血浆内皮素、一氧化氮水平，并观察胰腺组织病理学改变。结果 急性胰腺炎组随病变的进展，胰腺炎病理由水肿向出血坏死发展，而内皮素和一氧化氮从两者平行升高逐渐转向内皮素单一升高，致内皮素／一氧化氮比值上升；卡托普利干预组则胰腺炎病理改变减轻，胰腺组织病理学评分降低，且血浆内皮素水平低于急性胰腺炎组，而一氧化氮总体水平与急性胰腺炎组比较差别无显著性意义，内皮素／一氧化氮比值基本与对照组一致。结论 早期应用卡托普利可维持内皮素与一氧化氮平衡，对大鼠急性胰腺炎病变可能有保护作用。     

Herpes simplex virus entry is associated with tyrosine phosphorylation of cellular proteins

The initial step in herpes simplex virus (HSV) entry is binding of virion glycoprotein (g)C and/or gB to cell surface heparan sulfate. After this initial attachment, gD interacts with cell surface receptor or receptors, and the virion envelope fuses with the cell membrane. Fusion requires viral glycoproteins gB, gD, gL, and gH, but the cellular factors that participate in or the pathways activated by viral entry have not been defined. To determine whether signal transduction pathways are triggered by viral-cell fusion, we examined the association of viral entry with tyrosine phosphorylation of cellular proteins. Using immunoprecipitation and Western blotting, we found that at least three cytoplasmic host cell proteins, designated p80, p104, and p140, become tyrosine phosphorylated within 5-10 min after exposure to HSV-1 or HSV-2. However, no phosphorylation is detected when cells are exposed to a mutant virus deleted in gL that binds but fails to penetrate. Phosphorylation is restored when the gL-deletion virus is grown on a complementing cell line. Viral entry and the phosphorylation of p80, p104, and p140 are inhibited when cells are infected with virus in the presence of protein tyrosine kinase inhibitors. Taken together, these studies suggest that tyrosine phosphorylation of host cellular proteins is triggered by viral entry.     

高效液相色谱法测定地黄中腺苷含量

目的:建立地黄中腺苷含量的测定方法,测定不同品种地黄中腺苷的含量。方法:采用高效液相色谱法测定地黄中腺苷含量。以KYWG-C₁₈为固定相,6%乙腈为流动相,检测波长为260nm。结果:腺苷在0.002mg/ml～0.01mg/ml线性良好。回归方程为Y=1.7742×10-4+8.9021×10-7X,r=0.9995。平均回收率为94.1%。RSD=1.86%(n=5)。结论:本法简便、快速、结果可靠。     

甘草次酸修饰壳聚糖5-氟尿嘧啶对肝癌的抑制作用

目的观察甘草次酸修饰壳聚糖5-氟尿嘧啶纳米粒的体内外肝癌的靶向性及其对肝癌细胞的抑制作用。方法将甘草次酸（GA）和壳聚糖（CTS）合成甘草次酸修饰的壳聚糖纳米材料甘草次酸修饰的壳聚糖（GA-CTS）,并与5-氟尿嘧啶（5-Fu）合成GA-CTS／5-Fu纳米粒,通过共聚焦实验观察该纳米材料的肝癌靶向性,在原位肝癌模型中的药物分布,及其对肝癌细胞的体外抑制作用。结果GA和CTS成功合成GA-CTS,并通过红外光谱和核磁共振氢谱的验证。将GA-CTS与5-Fu制备成GA-CTS／5-Fu纳米粒。其粒径为193．7nm,栽药量为1．56％,多分散指数为0．003,并具有缓释的特性,能达到快速释放、稳步释放和缓慢释放三个阶段。GA-CTS／5-Fu纳米粒在体内分布表明,肝脏的5-Fu浓度最高,可见纳米粒具有明显的肝脏靶向性。激光共聚焦显微镜分析亦发现GA-CTS／5-Fu纳米粒具有明显的肝癌靶向性。体外对肿瘤细胞的杀伤作用具有时间和剂量依赖关系,对肝癌细胞有效作用时间明显比5-Fu延长。同时发现GA-CTS纳米粒具有明显对肝癌耐药细胞株抑制作用。结论GA-CTS／5-Fu纳米粒具有缓释作用,并且具有肝癌靶向性和明显的肿瘤抑制作用。     

静脉溶栓治疗对AMI患者左室重构的影响

目的 观察静脉溶栓治疗对ＡＭＩ患者左室重构的影响。方法 选择确诊为ＡＭＩ并经静脉溶栓治疗患者８２例,按临床非侵入性冠脉再通四项指标判定,８２例中再通４８例（再通组）未通３４例（未通组）。于梗塞后４～６周,平均５．４周行心脏彩色多普勒超声检理,测量左室舒张末期内径（ＬＶ）,左室射血分数（ＥＦ）,左室短轴缩短率（ＦＳ）,舒和早期峰值轿流速度／舒张晚期峰值血流速度（Ｅ／Ａ）,血流经过二尖瓣口的降速率（Ｄ     

西藏冬虫夏草水提液HPLC指纹图谱研究及核苷类成分测定

目的建立西藏不同产区27批冬虫夏草水提液的高效液相色谱指纹图谱,并定量测定其6种主要核苷类成分（尿苷、肌苷、鸟苷、胸苷、腺苷、2＇-脱氧腺苷）的质量分数。方法采用高效液相色谱法,色谱柱为Agilent Eclipse XDB—C18柱（250mm×4．6mm,5μm）,检测波长260nm,以甲醇．水为流动相进行梯度洗脱,柱温25℃,流速O．8mL·min^-1。结果建立了冬虫夏草水提液的HPLC指纹图谱,包含11个共有峰,各峰分离良好,指认出尿苷、肌苷、鸟苷、胸苷、腺苷、2’-脱氧腺苷6个特征成分．同时测定了其质量分数;6种特征成分质量浓度分别在10．71-96．4（r=0．9999）,8．50～76．41（r：0．9999）。7．838-70．54（r=0．9999）,1．120-10．08（r=0．9998）,5．715-51．44（1-=0．9999）,0．2625～2．363μg·mL^-1（r=0．9997）范围内与峰面积呈良好的线性关系;平均回收率依次为96．5％、97．7％、97．5％、95．2％、96．8％、101．5％,RSD分别为2．3％、2．7％、2．0％、2．6％、3．0％、2．7％（n=6）。结论本试验建立的指纹图谱可同时对冬虫夏草的6种主要核苷类成分进行分析,对评价藏产冬虫夏草的质量具有重要意义。     

Clinicopathologic features and clinical outcomes of intravenous leiomyomatosis of the uterus: A case series

Rationale:Intravenous leiomyomatosis (IVL) is a rare and special type of smooth muscle tumor originating in the uterus. It is classified as a benign disease according to its histological features but shows the behavioral characteristics of a malignant tumor. It is easily misdiagnosed and recurrent. The purpose of this study was to retrospectively analyze clinicopathological data of 25 cases of IVL in order to enhance clinicians’ understanding of this rare disease.Patient concerns:We screened and identified 25 cases of IVL at our hospital from October 2013 to January 2020. Five patients had tumors.Diagnoses:The diagnosis in each case was pathologically confirmed after surgical treatment.Interventions:All patients were managed surgically. Although the surgical procedures were different, the surgical approach was geared towards achieving complete excision. Three patients received hormonal therapy with gonadotropinreleasing hormone agonists after surgery.Outcomes:We retrospectively reviewed all medical records and analyzed the clinicopathologic features and clinical outcomes of this disease as well as the correlations between the clinical features and risk of recurrence. Neither the symptoms nor the preoperative imaging results were suggestive of IVL in any of the cases. Except for two patients who were lost to follow-up, twenty-three patients who were followed up are still alive. Three patients experienced a recurrence.Lessons:The clinical manifestations and ultrasound images of IVL in the early stages are not typical; thus, IVL is easily misdiagnosed as uterine leiomyoma. Radiologists, pathologists, and surgeons should have a thorough understanding of IVL and a high index of vigilance for IVL in clinical practice. Surgery should always be aimed at achieving complete tumor excision. Patients with large lesions (≥7 cm) and lesions extending to the broad ligament may have an increased risk of recurrence. Early detection, diagnosis, and treatment are very important; once the diagnosis is confirmed, regular follow-ups are crucial.     

Efficacy and safety of app-based remote warfarin management during COVID-19-related lockdown: a retrospective cohort study

Journal of Thrombosis and Thrombolysis - Patients undergoing percutaneous coronary intervention (PCI) for acute myocardial infarction (AMI) are at increased risk for thrombotic and bleeding...     

虾青素抑制氧化应激改善陈旧红细胞保存质量

目的:观察虾青素能否抑制陈旧悬浮红细胞内的氧化应激,改善红细胞保存质量。方法:采集志愿者血液,制备去白悬浮红细胞,将其随机分为4组,对照组加入DMSO,另外3组悬浮红细胞的保存液内加入抗氧化剂虾青素使其终浓度分别为5、10和20μmol/L,悬浮红细胞于2℃~6℃内保存。保存至28 d、42 d采用倒置荧光显微镜观察悬浮红细胞内活性氧族的表达状况,采用荧光酶标仪测定红细胞内活性氧族的含量,采用硫代巴比妥酸比色法测定红细胞内丙二醛含量,扫描电镜观察红细胞的超微结构,采用化学比色法测定三磷酸腺苷含量,采用紫外测试法测定2,3-二磷酸甘油酸含量。结果:与各自对照组相比,加虾青素的三组储存28 d和42 d悬浮红细胞内活性氧族和丙二醛含量降低,三磷酸腺苷和2,3-二磷酸甘油酸水平升高,改善了红细胞的形态。结论:虾青素可以通过降低储存悬浮红细胞内的氧化应激水平改善红细胞保存质量。     

妊娠合并宫颈癌的诊治进展

宫颈癌是妊娠期妇女第3大常见恶性肿瘤,仅次于恶性黑色素瘤和乳腺癌。妊娠合并宫颈癌的处理,应在治疗患者肿瘤本身及维护母儿健康之间取得平衡,这给临床医师带来极大挑战。目前全球范围内的妊娠合并宫颈癌治疗共识及指南,均以小样本回顾性研究及专家共识为基础制定,缺乏可靠的循证医学证据,在治疗方案上也存在分歧,迄今对该病尚无统一的治疗方案。笔者拟就妊娠合并宫颈癌的诊疗进展进行探讨,以期为临床决策提供可供参考的依据。