We purified and characterizated a phospholipase A 2 homologue from Agkistrodon blomhoffii ussurensis snake venom. We used Hitrap SP cation exchange and Superdex 75 columns chromatography to obtain a basic protein, use...We purified and characterizated a phospholipase A 2 homologue from Agkistrodon blomhoffii ussurensis snake venom. We used Hitrap SP cation exchange and Superdex 75 columns chromatography to obtain a basic protein, used SDS PAGE to analyse molecular mass, and IEF (Isoelectric focusing electrophoresis) IEF to identify isoelectric point. The molecular mass was 16 kDa, and the isoelectric point was 8 56. We detected its phospholipase A 2 activity on egg yolk phospholipids, hemolytic activity on washed erythrocytes, and anticoagulant effect on pig platelet rich plasma, as well as the N terminal sequence with protein sequencer. The results showed that it had no phospholipase A 2 activity and hemolytic activity, but had obvious anticoagulant effect on in vitro. The N terminal sequence (21 amino acid residues) compared with other phospholipases A 2 demonstrated that the protein was homogenous with BPLA 2s from Agkistrodon halys Palls.展开更多
目的探讨急性缺血性脑卒中(acute ischemic stroke,AIS)静脉溶栓后出血转化及预后的危险因素。方法选择2017年6月-2019年6月211例进行静脉溶栓治疗的AIS患者为研究对象,其中出血转化(hemorrhagic tromsformation,HT)的34例患者记为HT组...目的探讨急性缺血性脑卒中(acute ischemic stroke,AIS)静脉溶栓后出血转化及预后的危险因素。方法选择2017年6月-2019年6月211例进行静脉溶栓治疗的AIS患者为研究对象,其中出血转化(hemorrhagic tromsformation,HT)的34例患者记为HT组,未出血转化的177例患者记为未HT组,出血转化率16.11%,分析静脉溶栓过程中强化降压与AIS静脉溶栓患者出血转化及预后的关系。结果单因素分析提示性别、年龄、从起病至阿替普酶(reombinant tissue plasminogen activator,rt-PA)溶栓治疗的时间间隔(onset to start of treatment,OTT)、入院血糖、基线美国国立卫生研究院卒中量表(National Institute of Health stroke scale,NIHSS)评分、2型糖尿病、心房颤动、静脉溶栓过程中强化降压差异有统计学意义(P<0.05或P<0.01),为静脉溶栓后HT的相关危险因素;二元Logistic分析表明基线NIHSS评分>17.5分为AIS患者静脉溶栓出血转化的独立危险因素(OR=1.639,P=0.013)。而心房颤动(OR=9.129,P<0.01)为静脉溶栓患者预后的独立危险因素。结论基线NIHSS评分>17.5分为AIS患者静脉溶栓后HT的独立危险因素,而静脉溶栓过程中强化降压为HT的相关危险因素;心房颤动为静脉溶栓患者预后的独立危险因素。展开更多
文摘We purified and characterizated a phospholipase A 2 homologue from Agkistrodon blomhoffii ussurensis snake venom. We used Hitrap SP cation exchange and Superdex 75 columns chromatography to obtain a basic protein, used SDS PAGE to analyse molecular mass, and IEF (Isoelectric focusing electrophoresis) IEF to identify isoelectric point. The molecular mass was 16 kDa, and the isoelectric point was 8 56. We detected its phospholipase A 2 activity on egg yolk phospholipids, hemolytic activity on washed erythrocytes, and anticoagulant effect on pig platelet rich plasma, as well as the N terminal sequence with protein sequencer. The results showed that it had no phospholipase A 2 activity and hemolytic activity, but had obvious anticoagulant effect on in vitro. The N terminal sequence (21 amino acid residues) compared with other phospholipases A 2 demonstrated that the protein was homogenous with BPLA 2s from Agkistrodon halys Palls.
文摘目的探讨急性缺血性脑卒中(acute ischemic stroke,AIS)静脉溶栓后出血转化及预后的危险因素。方法选择2017年6月-2019年6月211例进行静脉溶栓治疗的AIS患者为研究对象,其中出血转化(hemorrhagic tromsformation,HT)的34例患者记为HT组,未出血转化的177例患者记为未HT组,出血转化率16.11%,分析静脉溶栓过程中强化降压与AIS静脉溶栓患者出血转化及预后的关系。结果单因素分析提示性别、年龄、从起病至阿替普酶(reombinant tissue plasminogen activator,rt-PA)溶栓治疗的时间间隔(onset to start of treatment,OTT)、入院血糖、基线美国国立卫生研究院卒中量表(National Institute of Health stroke scale,NIHSS)评分、2型糖尿病、心房颤动、静脉溶栓过程中强化降压差异有统计学意义(P<0.05或P<0.01),为静脉溶栓后HT的相关危险因素;二元Logistic分析表明基线NIHSS评分>17.5分为AIS患者静脉溶栓出血转化的独立危险因素(OR=1.639,P=0.013)。而心房颤动(OR=9.129,P<0.01)为静脉溶栓患者预后的独立危险因素。结论基线NIHSS评分>17.5分为AIS患者静脉溶栓后HT的独立危险因素,而静脉溶栓过程中强化降压为HT的相关危险因素;心房颤动为静脉溶栓患者预后的独立危险因素。
