无症状高尿酸血症男性患者的心电图分析

目的：研究无症状高尿酸血症患者的心电图异常情况，以了解血尿酸与心血管疾病是否有关联。方法：对172名无症状高尿酸血症男性患者进行12导联的心电图检查，所获得资料以SPSS10．0软件包吉行X检验分析。结果：病例组心电图异常率较对照组高，并有显著差异性，病例组的心电图异常多见心肌缺血表现，并与对照组有显著差异性。结论：显示高尿酸对心脏存在一定的损害，与心肌缺血存在一定相关性。需要进一一步研究。     

An Approach to Bioactivity Assessment for Critical Quality Attribute Identification Based on Antibody-Antigen Complex Structure

Identification of critical quality attributes (CQAs) is an important step for development of biopharmaceuticals with intended performance. An accurate CQA assessment is needed to ensure product quality and focusing on development efforts where control is needed. The assignment of criticality is based on safety and efficacy. Efficacy is related to PK and bioactivity. Here, we developed a novel approach based on antibody-antigen complex structure and modeling as a complementary method for bioactivity assessment. To validate this approach, common product related quality attributes and mutagenesis data from several IgGs were assessed using available antibody-antigen complex structures, and results were compared with experimental data from bioactivity or binding affinity measurements. A stepwise evaluation scheme for structural based analysis is proposed; based on systematic assessment following the scheme, good correlation has been observed between structural analysis and experimental data. This demonstrates that such an approach can be applied as a complementary tool for bioactivity assessment. Main applications are 1) To decouple multiple attributes to achieve amino acid resolution for bioactivity assessment, 2) To assess bioactivity of attributes that cannot be experimentally generated, 3) To provide molecular mechanism for experimental observation and understand structure function relationship. Examples are provided to illustrate these applications.     

Identification of BRaf-Sparing Amino-Thienopyrimidines with Potent IRE1α Inhibitory Activity

Amino-quinazoline BRaf kinase inhibitor 2 was identified from a library screen as a modest inhibitor of the unfolded protein response (UPR) regulating potential anticancer target IRE1α. A combination of crystallographic and conformational considerations were used to guide structure-based attenuation of BRaf activity and optimization of IRE1α potency. Quinazoline 6-position modifications were found to provide up to 100-fold improvement in IRE1α cellular potency but were ineffective at reducing BRaf activity. A salt bridge contact with Glu651 in IRE1α was then targeted to build in selectivity over BRaf which instead possesses a histidine in this position (His539). Torsional angle analysis revealed that the quinazoline hinge binder core was ill-suited to accommodate the required conformation to effectively reach Glu651, prompting a change to the thienopyrimidine hinge binder. Resulting analogues such as 25 demonstrated good IRE1α cellular potency and imparted more than 1000-fold decrease in BRaf activity.     

钴原卟啉诱导HO-1表达增加对老龄小鼠骨骼肌组织氧化应激和炎症反应的影响

目的 探讨注射钴原卟啉(cobalt protoporphyrin,CoPP)诱导血红素加氧酶-1(heme oxygenase 1,HO-1)表达增加在老龄小鼠骨骼肌微环境包括氧化应激、炎症反应的调节作用.方法 分别将正常成年(2月龄)和老年(18月龄)C57 BL/6雄性小鼠按照简单随机抽样法分为对照组及注射CoPP组;CoPP组小鼠连续3d腹腔注射CoPP溶液[5 mg/(kg· d)],对照组注射同体积生理盐水.在3、7、14 d后取新鲜腓肠肌组织,Western blot检测HO-1(3d组)的表达,ELISA检测过氧化标志分子丙二醛(MDA)、过氧化氢(H2 O2)含量及抗氧化酶类CuZn-超氧歧化酶(SOD)等活性变化.用老年C57 BL/6小鼠建立腓肠肌损伤模型,采用简单随机抽样法分为CoPP处理组和对照组,分别在3、7、14 d后检测中性粒细胞和M2型巨噬细胞浸润.结果 正常老年组HO-1表达量高于成年组,老年组注射CoPP后HO-1表达升幅显著低于成年组(P＜0.05);注射CoPP后,成年和老年组MDA、H2O2含量均下降,SOD、CuZn-SOD、GSH-Px和CAT酶活性升高,且老年CoPP组过氧化标志分子含量高于成年CoPP组,抗氧化酶活性较低(P＜0.05).骨骼肌损伤后3、7d,CoPP处理组中性粒细胞浸润均低于对照组;CD163阳性M2型巨噬细胞浸润出现较晚,且注射CoPP后,M2型巨噬细胞的浸润显著高于对照组.结论 老年骨骼肌对CoPP的反应性下降,抗氧化应激能力下降.损伤后诱导HO-1表达增加能够降低早期中性粒细胞、促进M2型巨噬细胞的浸润,可能有助于骨骼肌损伤修复.     

Leveraging the Pre-DFG Residue Thr-406 To Obtain High Kinase Selectivity in an Aminopyrazole-Type PAK1 Inhibitor Series

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