步长稳心颗粒治疗功能性早搏60例疗效分析

目的:观察步长稳心颗粒(简称稳心颗粒)治疗功能性早搏的临床疗效及安全性。方法:选择功能性早搏60例病人,随机分为治疗组及对照组,每组各30例。治疗组给予稳心颗粒一包(9克),每日三次,温开水冲服;对照组给予倍他乐克25毫克,每日二次口服,一个月为一疗程。结果:四周后治疗组显效11例,有效16例,总有效率90%。对照组显效8例,有效18例,总有效率86.7%,p>0.05,两组比较无显著性差异。对血压、心率影响方面稳心颗粒明显优于倍他乐克结论:稳心颗粒治疗功能性早搏疗效显著,且效果稳定,安全无明显不良反应,值得临床推广应用。     

Highly selective screening of the bioactive compounds in Huoxue capsule using immobilized β2-adrenoceptor affinity chromatography

A highly selective assay was developed for screening compounds that bind to the porcine recombinant β₂-adrenoceptor (β₂-AR) with affinity chromatography coupled to quadrupole time-of-flight mass spectrometry (Q-TOF–MS). The methodology involved selective screening with immobilized β₂-AR, a highly accurate identification via Q-TOF–MS, and a functional evaluation of the screened compounds with a sensitive myograph system. Ferulic acid, hydroxysafflor yellow A (HSYA), and naringin were confirmed to be the bioactive compounds in Huoxue capsule that specifically bound to the β₂-AR. These compounds produced a concentration-dependent relaxation of arteries that were contracted by treatment with phenylephrine, and the relaxation caused by these compounds was attenuated in the presence of ICI 118551, a type of β₂-AR antagonist. Our data indicate that the use of an immobilized receptor is potentially an alternative method for the rapid screening of bioactive compounds in a complex matrix because of its high specificity. β₂-AR affinity chromatography was valuable in focusing attention on the further investigation of ferulic acid, HSYA, and naringin as β₂-AR agonists.     

SitA contributes to the virulence of Klebsiella pneumoniae in a mouse infection model

Klebsiella pneumoniae is an opportunistic pathogen, which causes a wide range of nosocomial infections. Recently, antibiotic resistance makes K. pneumoniae infection difficult to deal with. Investigation on virulence determinants of K. pneumoniae can provide more information about pathogenesis and unveil new targets for treatment or vaccine development. In this study, SitA, a Fur-regulated divalent cation transporter, was found significantly increased when K. pneumoniae was cultured in a nutrient-limited condition. A sitA-deletion strain (ΔsitA) was created to characterize the importance of SitA in virulence. ΔsitA showed higher sensitivity toward hydroperoxide than its parental strain. In a mouse intraperitoneal infection model, the survival rate of mice infected with ΔsitA strain increased greatly when compared with that of mice infected with the parental strain, suggesting that sitA deletion attenuates the bacterial virulence in vivo. To test whether ΔsitA strain is a potential vaccine candidate, mice were immunized with inactivated bacteria and then challenged with the wild-type strain. The results showed that using ΔsitA mutant protected mice better than using the wild-type strain or the capsule-negative congenic bacteria. In summary, SitA was found being important for the growth of K. pneumoniae in vivo and deleting sitA might be a potential approach to generate vaccines against K. pneumoniae.     

雷珠单抗联合复方血栓通胶囊对年龄相关性黄斑变性患者血液流变学和血清VEGF、PDGF的影响

摘要 目的：观察雷珠单抗联合复方血栓通胶囊对年龄相关性黄斑变性（AMD）患者血液流变学和血清血管内皮生长因子（VEGF）、血小板衍生生长因子（PDGF）的影响。方法：选取我院2019年6月~2021年1月收治的AMD患者60例（96眼）,按照随机数字表法分别为对照组（n=30,46眼）和实验组（n=30,50眼）,对照组给予雷珠单抗治疗,实验组给予雷珠单抗联合复方血栓通胶囊治疗,对比两组眼部相关指标、血液流变学指标和血清VEGF、PDGF水平变化情况,观察两组治疗期间不良反应发生情况。结果：实验组治疗3个月后眼内压（IOP）、黄斑中央区厚度（CMT）、脉络新生血管（CNV）面积低于对照组,视力高于对照组（P<0.05）。实验组治疗3个月后全血低切/中切/高切黏度、血浆黏度低于对照组（P<0.05）。实验组治疗3个月后血清VEGF、PDGF水平低于对照组（P<0.05）。两组不良反应发生率对比无差异（P>0.05）。结论：雷珠单抗联合复方血栓通胶囊可改善AMD临床症状,促进视力恢复,其作用机制可能与调节机体血液流变学、血清VEGF、PDGF水平有关。     

舒肝解郁胶囊联合阿戈美拉汀对抑郁症患者血清单胺类神经递质和神经功能相关因子的影响

摘要 目的：观察舒肝解郁胶囊联合阿戈美拉汀治疗抑郁症的疗效及对血清单胺类神经递质和神经功能相关因子的影响。方法：纳入我院2017年5月~2020年5月接诊的120例抑郁症患者,经双色球随机分组法将患者分为对照组和观察组,各为60例。对照组患者予以阿戈美拉汀治疗,观察组患者予以舒肝解郁胶囊联合阿戈美拉汀治疗。比较两组疗效、血清单胺类神经递质、神经功能相关因子、抑郁焦虑评分及不良反应发生率。结果：观察组的临床总有效率为93.33%（56/60）,高于对照组的73.33%（44/60）（P<0.05）。两组治疗6周后汉密尔顿抑郁量表（HAMD）、汉密尔顿焦虑量表（HAMA）评分较治疗前降低,且观察组较对照组低（P<0.05）。两组治疗6周后多巴胺（DA）、去甲肾上腺素（NE）、5-羟色胺（5-HT）水平较治疗前升高,且观察组高于对照组（P<0.05）。两组治疗6周后S100?茁、髓磷脂碱性蛋白（MBP）、神经元特异性烯醇化酶（NSE）水平较治疗前降低,且观察组低于对照组（P<0.05）。两组不良反应发生率对比无差异（P>0.05）。结论：舒肝解郁胶囊联合阿戈美拉汀治疗抑郁症,疗效显著,可有效调节血清单胺类神经递质和神经功能,改善抑郁症状,且安全可靠。     

梨星毛虫虫龄的划分及末龄幼虫头部形态和感器观察

为明确梨星毛虫Illidcris pruni的龄期,了解其头部感受器的种类、形态和分布,通过测量梨星毛虫的头壳宽度与体长两项指标,根据所得数据的频率分布直方图以及结合Dyar定律明确幼虫虫龄数,并利用Crosby生长法则和线性回归的方法对得出的结果进行验证;并采用扫描电镜对末龄幼虫头部形态及感受器进行观察。结果表明,梨星毛虫体长和头壳宽的频次分布均呈显著的5个峰,因此推断梨星毛虫为5个虫龄。各龄的体长变幅分别为2.96~4.04 mm、5.27~6.27 mm、7.76~8.36 mm、9.47~10.45 mm和11.83~12.11 mm,头壳宽变幅分别为0.316~0.358 mm、0.397~0.459 mm、0.538~0.598 mm、0.687~0.735 mm和0.947~1.011 mm。头壳宽符合戴氏法则和Crosby生长法则,并呈现明显的线性关系,因此头壳宽可作为梨星毛虫龄期划分的重要指标,体长可作为分龄的辅助指标。梨星毛虫末龄幼虫头部感器共有栓锥形感器、锥形感器和刺形感器3种感器,主要分布于触角、口器、上颚和下颚须。     

三康胶囊对高原移居青年PWC170的影响

目的探讨在高原服用三康胶囊对移居青年体力作业效率的影响.方法对进驻海拔3700 ml年的10名青年在服药前和服药15 d后分别用EGM-II型踏车功量计做坐位蹯车运动,初始负荷功率为50W,每3min递增50W,以60 r/min连续踏车至200w 3 min后终止.用直线回归法计算每位受试者的PWC170.结果服药前PWCl70为(234.63±16.68)W,服药后PWC170为(258.66±16.85)W,服药后较服药前PWG170明显增高,差异有非常显著性意义(P＜0.01).结论服用三康胶囊能明显提高高原移居青年的心功能及做功效率.     

Hyaluronan release from Streptococcus pyogenes: export by an ABC transporter

Capsular hyaluronan of Streptococcus pyogenes is synthesized at the protoplast membrane. It is widely assumed that hyaluronan is exported by the synthase itself and that no additional protein is required for transfer through plasma membranes. However, we produced an insertional mutation that reduced the mucoid phenotype, hyaluronan production, and capsule formation. Nucleotide sequence analysis of the insertion site identified a gene coding for a protein with an ATP-binding cassette (ABC) that belonged to an ABC transporter system and was located next to the hyaluronan synthesis genes. The mucoid phenotype was reconstituted by complementation with DNA encoding the ABC transporter system. These results indicated that an ABC transporter was required for efficient capsule production.     

疏风解毒胶囊辅以综合管理干预对慢性阻塞性肺疾病患者呼吸及运动功能的影响

摘要 目的：探讨疏风解毒胶囊辅以综合管理干预对慢性阻塞性肺疾病（COPD）患者呼吸及运动功能改善的影响。方法：选取2018年10月-2019年10月到我院进行治疗的COPD患者84例作为研究对象,随机数字表法分为两组,患者均使用疏风解毒胶囊进行治疗,对照组（n=42）予以常规干预,试验组（n=42）进行综合管理干预。对比两组患者的临床治疗有效率、肺功能改善情况、肺功能指标、呼吸困难指数（MRC）评分以及6分钟步行实验（6MWT）结果。结果：试验组的临床治疗有效率高于对照组（P<0.05）。干预后,两组动脉血二氧化碳分压（PaCO₂）和MRC评分较干预前降低（P<0.05）,动脉血氧分压（PaO₂）、动脉血氧饱和度（SaO₂）、第1秒用力呼气容器（FEV₁）、用力肺活量（FVC）、FEV₁/FVC均较干预前升高（P<0.05）,6MWT距离较干预前增加（P<0.05）,且试验组上述指标改善情况更优（P<0.05）。结论：疏风解毒胶囊辅以综合管理干预可提高COPD患者的临床治疗效果,改善其肺功能,可有效缓解呼吸困难,提升运动强度,值得在临床上应用与推广。     

Purification and characterization of KpsT,the ATP-binding component of the ABC-capsule exporter of Escherichia coli K1

The K1 capsule, an alpha(2,8)-linked polymer of sialic acid, is an important virulence determinant of invasive Escherichia coli. The 17-kb kps gene cluster of E. coli K1 encodes the information necessary for capsule expression at the cell surface. Two proteins, KpsM and KpsT, play a role in the transport of capsular polysaccharide across the cytoplasmic membrane, utilizing the energy from ATP hydrolysis. They belong to the ATP-binding cassette superfamily of transport proteins. In this study, we purified KpsT in its native form and show that the purified protein is able to bind ATP, undergo an ATP-dependent conformational change and hydrolyze ATP. Protease accessibility studies demonstrate the in vivo interaction between KpsM and KpsT.