ET患者外周血NLR与促炎症细胞因子水平的相关性分析

目的 探讨原发性血小板增多症(ET)患者外周血中性粒细胞-淋巴细胞比值(NLR)与促炎症因子白细胞介素(IL)-1β、IL-6与IL-8水平的相关性.方法 收集2017年6月至2020年6月在云南省第一人民医院确诊的56例Ph染色体阴性(BCR-ABL-)的ET患者为试验组,同期56例健康体检人员为对照组.采用全自动血液分析仪进行外周血常规参数检测,计算NLR,应用流式细胞仪检测IL-1β、IL-6和IL-8水平,分析NLR与IL-1β、IL-6和IL-8水平的相关性.结果 ET组NLR 4.37(0.33～13.66)高于对照组1.79(0.92～3.13),比较差异有统计学意义(U=6.814,P<0.05).ET组外周血中IL-1β、IL-6与IL-8水平分别为2.06(0.45～28.24)、6.57(0.10～159.06)和9.34(0.43～155.65)ng/L均高于对照组1.76(0.57～3.64)、3.42(0.83～13.02)和3.88(1.54～45.10)ng/L,比较差异均有统计学意义(U=1.799、2.668、3.828,P<0.05).ET组NLR与IL-1β、IL-6和IL-8水平呈正相关(r=0.2805、0.3727、0.2573,P<0.05).结论 NLR有可能作为初步判断ET患者体内炎性环境的一项简易指标.     

敲低EEFSEC可体外抑制前列腺癌细胞的增殖、迁移和侵袭

目的 探讨硒代半胱氨酸tRNA特异性真核延伸因子（EEFSEC）对人前列腺癌细胞增殖、迁移和侵袭的影响。方法 采用qRT-PCR法检测人正常前列腺细胞系RWPE1和人前列腺癌细胞系22Rv1、LNcap、Vcap、PC-3细胞中EEFSEC mRNA的表达;收集前列腺癌患者的癌组织和癌旁组织,采用Western blot法检测前列腺癌组织中EEFSEC的蛋白表达情况。慢病毒感染22Rv1 细胞,Western blot检测敲低效率;XTT实验检测各组细胞的增殖能力;划痕实验和Transwell实验用来检测细胞迁移能力;Transwell试验检测细胞侵袭能力;流式细胞术检测细胞周期;qRT-PCR检测敲低EEFSEC后周期相关基因的mRNA水平的变化。结果 与对照组相比,EEFSEC在前列腺癌中高表达（P<0.05）;且EEFSEC高表达导致前列腺癌患者不良预后;感染敲低EEFSEC的慢病毒后,可明显降低22Rv1细胞中EEFSEC的蛋白表达水平;与对照组相比,敲低EEFSEC可显著抑制22Rv1细胞的增殖（P<0.001）,迁移（P<0.001）和侵袭能力（P<0.001）;敲低EEFSEC细胞周期主要阻滞在G0/G1期,qRT-PCR实验显示敲低EEFSEC可明显下调C-myc和CCNB1的表达,上调p15的表达。结论 敲低EEFSEC可能通过降低C-myc表达来抑制前列腺癌细胞22Rv1的增殖、迁移和侵袭能力。     

长爪沙鼠肠道形态与能量需求的研究

目的分析物种差异与肠道形态及能量代谢的关系,阐明长爪沙鼠的能量需求。方法长爪沙鼠、SD大鼠、ICR小鼠各10只,分别单独饲养于代谢笼内,收集5 d动物24 h内的粪便、尿液。尿液及粪便经分别测量体积与重量后,送检尿能与粪能。收集结束后,所有动物称重,麻醉后腹主动脉采血致死,取动物肠道,测量肠长度。结果大鼠维持的消化能和代谢能分别为314.56 k J/d、314.55 k J/d,小鼠分别为10.608 k J/d、9.799 k J/d,沙鼠分别为99.828 k J/d、99.927 k J/d。大鼠每增加1 g体重需要的消化能和代谢能分别是19.273 k J和18.831 k J,小鼠分别是71.842 k J和72.390 k J,沙鼠分别是56.142 k J和55.965 k J。大、小鼠的消化道总长大于沙鼠,大鼠小肠最长,而沙鼠有较大的盲肠百分比。结论三种动物在肠道长度和能量需求方面有显著差异。     

Catheter ablation of accessory pathways, atrioventricular nodal reentrant tachycardia, and the atrioventricular junction: final results of a prospective, multicenter clinical trial. The Atakr Multicenter Investigators Group

BACKGROUND: The purpose of this study was to evaluate the safety and efficacy of a temperature-controlled radiofrequency catheter ablation system. METHODS AND RESULTS: The patient population included 1050 patients who had undergone ablation of atrioventricular nodal reentrant tachycardia (AVNRT), an accessory pathway (AP), or the atrioventricular junction (AVJ). Ablation was successful in 996 patients. The probability of success was highest among patients who had undergone ablation of the AVJ, lowest in patients who had undergone ablation of an AP, and in between for patients who had undergone ablation of AVNRT. A major complication occurred in 32 patients. Four variables predicted ablation success (AVJ, AVNRT, or left free wall AP ablation and an experienced center). Four factors predicted arrhythmia recurrence (right free wall, posteroseptal, septal, and multiple APs). Two variables predicted development of a complication (structural heart disease and the presence of multiple targets), and 3 variables predicted an increased risk of death (heart disease, lower ejection fraction, and AVJ ablation). CONCLUSIONS: These findings may serve as a guide to clinicians considering therapeutic options in patients who are candidates for ablation.     

卡托普利对高血压冠状动脉壁肥厚和储备力下降的预防作用

目的研究卡托普利对高血压冠状动脉壁肥厚和储备力下降的预防作用。方法４ｗ大鼠设３组：分别为自发性高血压大鼠（ＳＨＲ）组、ＳＨＲ口服卡托普利组（ＳＨＲ＋Ｃ）和正常血压大鼠（ＷＫＹ）组,饲养１２ｗ。结果ＳＨＲ＋Ｃ组较ＳＨＲ组,收缩压、冠状动脉壁横截面积、横截面积与内径比及中层血管平滑肌细胞宽度显著下降,最大冠状动脉流量增加,与ＷＫＹ组无显著差异。结论卡托普利能完全预防ＳＨＲ冠状动脉壁肥厚和储备力下降。     

Mast‐cell growth and differentiation

Abbreviations . MC: mast cell; T: tryptase; C: chymase; CPA: carboxypeptidase A; Bsp‐1: basophil specific antibody 1.     

A longitudinal study of otitis media with effusion among 2- to 5-year-old African-American children in child care

OBJECTIVE: To prospectively document the prevalence of otitis media with effusion (OME) in 86 African-American children between ages 2 and 5 years. STUDY DESIGN: Eighty-six children in center-based child care whose ear status had been followed from infancy continued to be observed. Middle ear status was assessed by pneumatic otoscopy and tympanometry biweekly. RESULTS: The prevalence of OME decreased as children became older. The mean proportion of examinations demonstrating bilateral OME (BOME) ranged from 12% between 24 to 30 months to 4% between 54 to 60 months of age. The mean proportion of exams revealing bilateral normal ears increased from 77% at 24 to 30 months to 88% at 54 to 60 months of age. Although 60 children had experienced BOME that lasted 4 months or longer in the 6- to 24-month age period, only 8 of these children experienced at least 4 months of continuous BOME between 24 to 60 months. CONCLUSIONS: The proportion of time with BOME decreased progressively with increasing age in this population. Only 8 of 60 children who had experienced more than 4 consecutive months of BOME before 2 years of age continued to manifest persistent effusion or experience recurrences of prolonged BOME after 2 years of age.     

Collapsin-1/semaphorin-III/D is regulated developmentally in Purkinje cells and collapses pontocerebellar mossy fiber neuronal growth cones

Most axons in the CNS innervate specific subregions or layers of their target regions and form contacts with specific types of target neurons, but the molecular basis of this process is not well understood. To determine whether collapsin-1/semaphorin-III/D, a molecule known to repel specific axons, might guide afferent axons within their cerebellar targets, we characterized its expression by in situ hybridization and observed its effects on mossy and climbing fiber extension and growth cone size in vitro. In newborn mice sema-D is expressed by cerebellar Purkinje cells in parasagittal bands located medially and in some cells of the cerebellar nuclei. Later, sema-D expression in Purkinje cells broadens such that banded expression is no longer prominent, and expression is detected in progressively more lateral regions. By postnatal day 16, expression is observed throughout the cerebellar mediolateral axis. Collapsin-1 protein, the chick ortholog of sema-D, did not inhibit the extension of neurites from explants of inferior olivary nuclei, the source of climbing fibers that innervate Purkinje cells. In contrast, when it was applied to axons extending from basilar pontine explants, a source of mossy fiber afferents of granule cells, collapsin-1 caused most pontine growth cones to collapse, as evidenced by a reduction in growth cone size of up to 59%. Moreover, 63% of pontine growth cones arrested their extension or retracted. Its effects on mossy fiber extension and its distribution suggest that sema-D prevents mossy fibers from innervating inappropriate cerebellar target regions and cell types.     

针刺不同穴位对视网膜电图和皮层视觉诱发电位的影响

目的:观察针刺不同穴位对健康成人视网膜电图(ERG)和视觉诱发电位(VEP)的影响,探讨经穴功能的相对特异性。方法:33名志愿者参与本实验。以直径为1 cm装有导电膏的圆盘形表面电极放置于眼眶下缘皮肤表面(测ERG),或放置于正中线右旁开5 cm、耳上5 cm的枕部皮肤表面(测VEP)。视觉刺激的闪光频率为1次/s,光源与眼距离50 cm。受试者静卧,给予20次闪光刺激,同时用叠加仪将20次ERG、VEP反应进行平均加算,获得1次叠加结果。按同法记录3～5次反应作为针前基础值。然后刺激穴位,待出现针感时连接电子刺激器,给予电脉冲刺激,频率0.5 Hz,波宽0.2 ms,电针10 min后记录3～5次ERG、VEP作为针时值。测试穴位分别为光明、内关、足三里,每穴测试时间至少相隔3 d。结果:电针刺激光明穴对ERGb波振幅、VEP P100振幅的影响较大,变化是双向的,而电针刺激内关穴和足三里穴对ERGb波的振幅和VEP P100振幅的影响比较小,其差异十分显著(P0.01)。结论:电针胆经光明穴对ERG和VEP振幅的影响明显大于电针内关和足三里,提示不同穴位对ERG、VEP活动的影响具有相对的特异性。