孕酮对牙周膜成纤维细胞c—los、c-jun基因表达的影响

目的：研究孕酮对牙周膜成纤维细胞c—fos、c-jun基因表达的影响,探讨孕酮促进人牙周膜成纤维细胞（hPDLCs）增殖和成骨分化的可能机制。方法：原代培养hPDLCs,取第4-6代细胞用于实验。分为空白对照组,孕酮组,抑制剂组。各组细胞培养2h,采用反转录聚合酶链反应检测c—fos和c-junmRNA的表达。结果：RT—PCR的结果说明,孕酮能促进c—fos和c-junmRNA的表达,抑制剂组c—fos和c-junmRNA的表达下调。结论：孕酮能够上调hPDLCs中c—fos、c-jun的表达。提示孕酮可能通过上调c—fos、c-jun的表达促进hPDLCs的增殖和成骨分化,促进骨形成。     

Coexistence of non-alcoholic fatty liver disease with elevated alanine aminotransferase is associated with insulin resistance in young Han males

Elevated alanine aminotransferase (ALT) and non-alcoholic fatty liver disease (NAFLD) have been associated with insulin resistance (IR). The objective of this study was to determine whether elevated ALT and NAFLD were useful for early and definitive determination of IR and to compare their coexistence with conventional risk factors in young Han males. Anthropometric and metabolic measurements were assessed in 216 young Han males (19.3 ± 0.8 years). NAFLD was diagnosed using ultrasonography, and the homeostasis model assessment of insulin resistance (HOMA-IR) served as an index of IR. Subjects in the fourth HOMA-IR quartile had a significantly higher frequency of abdominal obesity, elevated blood pressure and ALT, and NAFLD compared to subjects in quartiles 1-3 (P < 0.05). Using multivariate logistic regression analysis, risk of IR increased by 2.33-fold (95% CI: 1.00-5.42, P = 0.050) in participants with NAFLD. In addition, the coexistence of NAFLD and elevated ALT were significantly associated with HOMA-IR and participants with both elevated ALT and NAFLD had a 4.65-fold (95% CI: 1.55-13.97, P = 0.006) increased risk of IR. Coexistence of NAFLD and elevated ALT are associated with IR in young Han males and might be useful for early detection of IR as compared to conventional risk factors.     

The mitigation effects of exogenous melatonin on salinity-induced stress in Malus hupehensis

Abstract:  As an indoleamine molecule, melatonin mediates many physiological processes in plants. We investigated its role in regulating growth, ion homeostasis, and the response to oxidative stress in Malus hupehensis Rehd. under high‐salinity conditions. Stressed plants had reduced growth and a marked decline in their net photosynthetic rates and chlorophyll contents. However, pretreatment with 0.1 μm melatonin significantly alleviated this growth inhibition and enabled plants to maintain an improved photosynthetic capacity. The addition of melatonin also lessened the amount of oxidative damage brought on by salinity, perhaps by directly scavenging H₂O₂ or enhancing the activities of antioxidative enzymes such as ascorbate peroxidase, catalase, and peroxidase. We also investigated whether melatonin might control the expression of ion‐channel genes under salinity. Here, MdNHX1 and MdAKT1 were greatly up‐regulated in the leaves, which possibly contributed to the maintenance of ion homeostasis and, thus, improved salinity resistance in plants exposed to exogenous melatonin.     

刚地弓形虫磷酸甘油酸变位酶2基因片段克隆、表达及抗原性分析

目的克隆、表达刚地弓形虫(Toxoplasma gondii)磷酸甘油酸变位酶2(TgPGAM2)基因片段,并分析其抗原性。方法提取弓形虫RH株速殖子总RNA,逆转录合成cDNA。PCR扩增TgPGAM2基因。扩增产物经双酶切后连接入pET30a(+)载体,重组质粒转化大肠埃希菌(E.coli)DH5α,阳性菌落经PCR和双酶切鉴定,并测序。将测序正确的重组质粒pET30a(+)-TgPGAM2转化至E.coli BL21并加入异丙基-β-D-硫代半乳糖苷(IPTG)诱导表达,十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)结合考马斯亮蓝染色检测表达产物。以兔抗弓形虫血清为一抗,蛋白质印迹(Western blotting)分析重组蛋白的抗原性。结果PCR扩增产物约为750 bp。菌落PCR、双酶切和测序结果显示,重组质粒pET30a(+)-TgPGAM2构建成功。SDS-PAGE结果显示,经IPTG诱导获得相对分子质量(Mr)约30 000的可溶性重组蛋白。Western blotting分析证实其能被兔抗弓形虫血清识别。结论刚地弓形虫RH株TgPGAM2基因片段可在原核表达系统中表达,且该可溶性重组蛋白具有抗原性。     

脂联素在糖调节受损患者冠状动脉病变风险中的意义

目的 探讨脂联素在不同糖调节受损者冠脉病变发生及严重程度中的临床意义.方法 疑似冠心病行冠脉造影者210例,分为正常血糖组(NGT) 42例,空腹血糖调节受损组(IFG) 36例,糖耐量受损组(IGT)92例(其中IGT1组44例2 h 血糖＜10 mmol/L;IGT2组48例2h血糖≥10mmol/L),IFG+IGT组40例.检测体重指数、血压、血脂、胰岛素、脂联素、C反应蛋白,并进行Gensini评分.结果 IGT、IFG+IGT组冠心病患病率及Gensini评分显著高于IFG及NGT(P＜0.05);脂联素在IGT、IFG+IGT两组中显著低于IFG、NGT组(P＜0.05),C反应蛋白在IGT、IFG+IGT两组显著升高(P＜0.05);IGT2组较IGT1组Gensini显著升高、脂联素显著下降(P＜0.05);Gensini与脂联素负相关,与C反应蛋白、HOMA-IR正相关(p＜0.05);多因素逐步回归分析显示脂联素和HOMA-IR是冠脉病变严重程度独立影响因素.结论 低脂联素血症可更敏感地预测IGR患者的冠脉病变程度,尤其在IGT组中,如餐后血糖控制在10 mmol/L以下可能会带来更大的心血管获益.     

伤椎置钉并椎体内植骨内固定术在胸腰椎骨折治疗中的应用

目的观察伤椎置钉并椎体内植骨内固定术在胸腰椎骨折治疗中的应用效果。方法至少一侧椎弓根完整的胸腰椎骨折26例,予伤椎撬拨复位置钉、椎体内植骨、椎弓根内固定,据胸腰段正侧位片比较术前、术后即刻、术后6个月的椎体高度及Cobb’s角,并评估脊髓神经功能和融合情况。结果术后随访7～28个月。患者术后即刻伤椎椎体前缘高度占正常高度百分比及Cobb’s角优于术前(P均<0.05);伤椎外形恢复满意;按ASIA脊髓神经功能分级,伴神经损伤者15例中,A级1例无恢复,余均改善1～3级(P均<0.05),内固定无失效,植骨皆融合。结论伤椎置钉并椎体内植骨内固定术治疗胸腰椎骨折可重建椎体结构,增强脊柱稳定,近期疗效较好。     

老年糖尿病合并冠心病患者的窦性心率震荡分析

目的：探讨老年糖尿病（DM）合并冠心病（CHD）患者窦性心率震荡（HRT）变化的意义。方法：选择伴有室性早搏的老年DM合并CHD患者46例（DM＋CHD组）、老年DM非CHD患者52例（DM组）和老年健康人56例（健康对照组）,计算各组震荡起始（TO）及震荡斜率（TS）,并进行比较。结果：与健康对照组比较,DM组和DM＋CHD组TO值明显升高[（0.43±2.11）比（1.64±2.79）比（3.72±3.32）],TS值明显下降[（11.33±1.29）比（9.26±2.05）比（6.96±2.62）],P均〈0.05;多支病变较单支病变有TO上升,TS下降的趋势,但差异无显著性（P〉0.05）。结论：窦性心率震荡可作为老年糖尿病合并冠心病患者自主神经系统功能的完整性和稳定性及预后的指标之一。     

血小板减少的系统性红斑狼疮患者骨髓巨核细胞量与临床特点的关系

目的 分析血小板减少的系统性红斑狼疮(SLE)患者的临床、实验室特点,探讨骨髓巨核细胞数量对患者临床特征的影响.方法 回顾性分析北京大学人民医院住院102例血小板减少的SLE患者,以无血小板减少的140例SLE患者为对照,比较2组在器官受累、疾病活动度、骨髓象、免疫学特征及疗效方面的差别.统计学方法采用x2检验和t检验.结果 75例患者血小板减少发生在SLE确诊前后1年之间.血小板减少发生在SLE确诊前的患者中,血小板下降程度更为显著.有血小板减少的SLE患者脏器受累比例较高,主要包括神经系统和肺,但2组在总体SLE疾病活动指数(SLEDAI)评分方面的差异无统计学意义.根据骨髓巨核细胞数量分组,16例患者巨核细胞减少,无巨核细胞减少的患者34例.巨核细胞减少组的患者无论在疾病活动度、脏器受损等临床特点方面与无巨核细胞减少组差异无统计学意义.血小板减少的近期治疗效果也与骨髓巨核细胞数量无相关性.结论 合并血小板减少的SLE患者容易合并其他重要脏器受损.