贵州省地方性氟中毒地区人群GSTP1基因Ile105Val位点多态性分析

Objective To investigate plasma glutathione S-transferase(GSTs) activity and GSTP1 gene Ile105Val polymorphism in Bijie City, Guizhou Province, a coal-burning fluorosis endemic area. Methods One hundred and sixty villagers from Yachi Twon using non-improved cooking stoves were selected as the non-intervened group in Bijie City, Guizhou Province where coal-burning fluorosis was prevailing; 153 villagers as the intervented group were chosen from Changchun Twon, where cooking stoves were improved; 151 villagers were served as the control group from Baiyunshan Twon, Changshun County without endemic fluorosis. The activity of GSTs was tested by colorimetric analysis with spectrophotometer. The genotype of the GSTP1 gene Ile105Val polymorphism, presenting as either homozygous wild-type (AA), or heterozygous mutation type (AG), or homozygous mutation type (GG), was detected through the PCR-RFLP procedure. Results The activity of GSTs in plasma of non-intervened group [(12.44±4.97) kU/L]was significantly lower than that of intervened group (P < 0.05), and that of intervened group[(20.78±6.20)kU/L]was significantly lower than that of control group[(24.30±6.27)kU/L, P< 0.05]. The difference of the enzyme activity of three groups were statistically significant (F = 51.71, P < 0.05), but this enzyme activity did not vary significantly in each sex of each grnup(P > 0.05). Compared intervened group [AA:67.3%(103/153), AG:29.4%(45/153),GG:3.3%(5/153)]and non-intervened group[AA:66.9%(107/160), AG:30%(48/160), GG:3.1%(5/160)]with control group[AA:74.8%(113/151), AG:25.2%(38/151), GG:0 (0/151)], the Ile105Val polymorphism site of GSTP1 gene had significant difference(χ2= 6.04,6.07, both P< 0.05), but not significant between intervened and non-intervened groups(χ2 = 0.02, P>0.05). Conclusions Fluorosis can decrease the activity of GSTs and introduce the GSTP1 gene Ile105Val polymorphism, intervention with the fluorine intake will improve the effect of fluoride on the body.     

贵州省地方性氟中毒地区人群GSTP1基因Ile105Val位点多态性分析

Objective To investigate plasma glutathione S-transferase(GSTs) activity and GSTP1 gene Ile105Val polymorphism in Bijie City, Guizhou Province, a coal-burning fluorosis endemic area. Methods One hundred and sixty villagers from Yachi Twon using non-improved cooking stoves were selected as the non-intervened group in Bijie City, Guizhou Province where coal-burning fluorosis was prevailing; 153 villagers as the intervented group were chosen from Changchun Twon, where cooking stoves were improved; 151 villagers were served as the control group from Baiyunshan Twon, Changshun County without endemic fluorosis. The activity of GSTs was tested by colorimetric analysis with spectrophotometer. The genotype of the GSTP1 gene Ile105Val polymorphism, presenting as either homozygous wild-type (AA), or heterozygous mutation type (AG), or homozygous mutation type (GG), was detected through the PCR-RFLP procedure. Results The activity of GSTs in plasma of non-intervened group [(12.44±4.97) kU/L]was significantly lower than that of intervened group (P < 0.05), and that of intervened group[(20.78±6.20)kU/L]was significantly lower than that of control group[(24.30±6.27)kU/L, P< 0.05]. The difference of the enzyme activity of three groups were statistically significant (F = 51.71, P < 0.05), but this enzyme activity did not vary significantly in each sex of each grnup(P > 0.05). Compared intervened group [AA:67.3%(103/153), AG:29.4%(45/153),GG:3.3%(5/153)]and non-intervened group[AA:66.9%(107/160), AG:30%(48/160), GG:3.1%(5/160)]with control group[AA:74.8%(113/151), AG:25.2%(38/151), GG:0 (0/151)], the Ile105Val polymorphism site of GSTP1 gene had significant difference(χ2= 6.04,6.07, both P< 0.05), but not significant between intervened and non-intervened groups(χ2 = 0.02, P>0.05). Conclusions Fluorosis can decrease the activity of GSTs and introduce the GSTP1 gene Ile105Val polymorphism, intervention with the fluorine intake will improve the effect of fluoride on the body.     

茶叶中黄曲霉毒素的高效液相色谱串联质谱法

目的建立茶叶中黄曲霉毒素B1、B2、G1和G2的高效液相色谱串联质谱(HPLC-MS/MS)法。方法样品经70%甲醇超声提取15 min,免疫亲和柱净化后,用ZORBAX Eclipse Plus C18色谱柱(2.1 mm×100 mm,1.8μm)进行分离,流动相为甲醇-0.1%甲酸水(体积比为45∶55),采用多反应监测(MRM)正离子模式进行检测。结果在0.5~50.0 ng/ml的线性范围内,所得4种黄曲霉毒素的回归方程均具有良好的线性关系(r≥0.999 5)。该方法检出限为0.02~0.04μg/kg,定量下限为0.07~0.13μg/kg;平均回收率为75.6%~98.5%,RSD为3.9%~7.1%。结论该方法简单、准确、灵敏度高,适用于茶叶中黄曲霉毒素B1、B2、G1和G2的批量检测。     

拟交感效应对快速起搏离体心脏心房缝隙连接蛋白43重构的影响

目的:通过建立离体拟交感心房颤动模型,探讨缝隙连接蛋白43(Cx43)水平的变化。方法:15只杂种犬随机分为3组(每组5只):对照组(control组)、快速心房起搏组(RAP组)和异丙肾上腺素灌流+快速心房起搏组(ISO+RAP组)。经胸骨正中切开术,快速取出心脏,建立心脏Langendorff离体灌流模型。各组分别检测心房有效不应期(AERP)及房颤诱发率,免疫组化检测酪氨酸羟化酶(TH)在细胞内的表达,Western blot检测Cx43和磷酸化Cx43的蛋白含量,免疫荧光检测Cx43在心肌组织的变化,TUNEL法检测心肌细胞凋亡,荧光比色法检测线粒体活性氧簇(ROS)的生成量。结果:与control组比较,RAP组的AERP无明显变化,且仅出现电紊乱,ISO+RAP组的AERP明显缩短(P0.05),并可成功诱发房颤。与control组比较,RAP组和ISO+RAP组的TH表达量、细胞凋亡指数和线粒体ROS生成量均逐渐增多(P0.05),Cx43蛋白表达量和磷酸化水平逐渐减少(P0.05)。免疫荧光显示,与control组相比,RAP组的Cx43荧光强度降低,且呈明显侧链化,ISO+RAP组则呈点状散在分布。结论:交感神经可能通过氧化应激效应,引起Cx43的重构与下调,从而介导心房颤动的发生。     

缝隙连接与心脏疾病

缝隙连接是存在于相邻组织细胞间特殊的膜通道结构,为相邻细胞间电和代谢信号的直接通路,在人体绝大部分组织中表达。缝隙连接对于心脏的冲动传导极为重要,研究发现其表达、分布重构、结构和功能的改变与诸多心脏疾病,如冠心病、心肌病及心律失常等具有相关性。心肌细胞再生能力有限,因此,通过有效的骨髓间充质干细胞移植治疗,改善心肌细胞的电生理异常和心肌重构,将为临床上治疗心脏疾病提供广阔的空间。     

舒心饮改善气阴两虚型胸痹患者中医证候的疗效分析

目的观察舒心饮改善气阴两虚型胸痹(冠心病心绞痛)患者中医证候的疗效。方法将胸痹患者133例随机分为治疗组(66例)与对照组(67例)。治疗组予舒心饮治疗,对照组予生脉饮治疗,疗程共4周。主要观察治疗前后患者中医证候疗效情况。结果治疗后,两组患者的胸闷、头晕、失眠、心悸等中医证候均获得改善,治疗组对胸闷和失眠的改善明显优于对照组(P<0.01)。结论较经典益气养阴药物生脉饮而言,舒心饮能够更好地改善胸痹患者胸闷和失眠中医证候;气阴两虚     

培哚普利对慢性心力衰竭患者血清生长分化因子15水平的影响

目的研究培哚普利对慢性心力衰竭(心衰)患者血清生长分化因子15(GDF-15)水平的影响及与病情的相关性。方法将79例慢性心衰(心衰组)患者随机再分为2组:小剂量组39例,大剂量组40例,疗程6个月。另选择40例仅有心血管病危险因素的患者作为对照组。ELISA法检测2组治疗前后GDF-15、N末端B型钠尿肽前体(NT-proBNP)水平;分析GDF-15与NT-proBNP、纽约心功能分级(NYHA)、超声心动图指标的相关性。结果心衰组GDF-15、NT-proBNP水平明显高于对照组(P<0.01)。NYHAⅠ～Ⅳ级患者GDF-15、NT-proBNP水平随NYHA逐级递增(P<0.01)。GDF-15分别与NT-proBNP(r=0.903,P=0.000)、NYHA(r=0.636,P=0.000)、左心室舒张末内经(r=0.806,P=0.000)呈正相关,与LVEF(r=-0.704,P=0.000)呈负相关。治疗6个月后,小剂量组与大剂量组GDF-15、NT-proBNP水平较治疗前明显降低(P<0.01),大剂量组较小剂量组降低更明显(P<0.01)。结论 GDF-15可作为新的心衰标记物,有助于评估疗效和预后。     

超声检测颈动脉粥样硬化对冠心病的预测价值

<正>动脉粥样硬化是全身性动脉疾病,常同时累及多处动脉血管床。外周动脉粥样硬化与冠状动脉粥样硬化有共同的病理基础和危险因素。其中,美国60岁以上老年人颈动脉粥样硬化发病率为70%,而我国发病率为49.4%。冠心病是动脉粥样硬化的并发症之一,也是致死率和致残率较高的疾病之一。近年来,外周动脉疾病已被列为冠心病的等危症。亚临床阶段的外周动脉粥样硬化与冠心病病变程度、范围的相关性研究有重要意义。彩色多普勒超声是一种无创     

重症甲型H1N1流感并肺炎的CT表现

目的探讨甲型H1N1流感并肺炎的CT表现。方法 5例临床确诊甲型H1N1流感的重症患者共8次胸部CT扫描(复查3例)资料。结果 5例中均为双肺多叶、多段实变灶,无明显肺叶、肺段或特定体位分布趋势;大片肺实变表现为双侧沿支气管树分布的肺段实变;内有明显的空气支气管征;相邻肺段实变融合或在叶间裂处相邻的肺叶实变扩展,于影像接触部位融合,形成更大片实变影;肺内小病灶均为双肺多发,呈类圆形或棉团状,沿肺纹理分布最多见;大片肺实变可呈均匀致密实变、磨玻璃样变、蜂窝状实变,小病灶与大片实变灶一致,磨玻璃样变可出现在初诊和吸收期病例;反应性胸膜增厚及胸膜积液常见;无纵膈、肺门淋巴结肿大。结论 CT改变提示:甲型H1N1重症病例并肺炎在病程发展阶段,病变有经支气管肺泡系播散的特点。