Mexiletine-responsive erythromelalgia due to a new Nav1.7 mutation showing use-dependent current fall-off

Inherited erythromelalgia (IEM), characterized by episodic burning pain and erythema of the extremities, is produced by gain-of-function mutations in sodium channel Na_v1.7, which is preferentially expressed in nociceptive and sympathetic neurons. Most patients do not respond to pharmacotherapy, although occasional reports document patients as showing partial relief with lidocaine or mexiletine. A 7-year-old girl, with a two-year history of symmetric burning pain and erythema in her hands and feet, was diagnosed with erythromelalgia. Treatment with mexiletine reduced the number and severity of pain episodes. We report here a new IEM Na_v1.7 mutation in this patient, and its response to mexiletine. SCN9A exons from the proband were amplified and sequenced. We identified a single nucleotide substitution (T2616G) in exon 15, not present in 200 ethnically-matched control alleles, which substitutes valine 872 by glycine (V872G) within DII/S5. Whole-cell patch-clamp analysis of wild-type and mutant Na_v1.7 channels in mammalian cells show that V872G shifts activation by − 10 mV, slows deactivation, and generates larger ramp currents. We observed a stronger use-dependent fall-off in current following exposure to mexiletine for V872G compared to wild-type channels. These observations suggest that some patients with IEM may show a favorable response to mexiletine due to a use-dependent effect on mutant Na_v1.7 channels. Continued relief from pain, even after mexiletine was discontinued in this patient, might suggest that early treatment may slow the progression of the disease.     

Quality of life in patients with facial steroid dermatitis before and after treatment

Background Improper long‐term, even low‐dose, topical corticosteroids, especially application to the face, could induce steroid dermatitis, which was refractory and detrimental to the quality of life. Objective To evaluate the quality of life in patients with facial steroid dermatitis before and after the treatment of doxycycline and indomethacin plus support therapy. Study design A prospective study. Setting Outpatients of the Department of dermatology, the Third Hospital of Hangzhou, from August 2, 2004, to April 20, 2005. Subjects Fifty consecutive outpatients completed the treatment. Intervention The intervention is doxycycline 10 mg twice a day and indomethacin 25 mg twice a day for 4 weeks, cetirizine or loratadine 10 mg daily if pruritic, topical white petroleum if feeling dry and wet dressing if burning and oedema, plus psychological support and health education. Main outcome measure The efficacy of the treatment was quantified using a 24‐point steroid clinical score. The detriment of the quality of life was quantified using a 30‐point Dermatology Life Quality Index. Results The steroid dermatitis clinical score decreased significantly from 15.06 ± 4.61 at baseline to 4.52 ± 3.39 at 2 weeks after the end of treatment (week 6; P < 0.001). Twenty‐one patients underwent a rebound phenomenon and the steroid dermatitis clinical score increased significantly from 13.71 ± 4.33 at baseline (week 0) to 19.24 ± 3.40 at 1 week after treatment (week 1; P < 0.001). Quality of life score decreased significantly from 13.76 ± 7.68 at baseline to 3.44 ± 2.57 at 2 weeks after the end of treatment (week 6; P < 0.001). Conclusions The quality of life was profoundly affected by facial steroid dermatitis. Doxycycline and indomethacin plus support therapy might be effective in patients with facial steroid dermatitis.     

Is delayed micro-graft hair transplantation possible?--evaluation of viabilities of hair follicles preserved in two storage media.

BACKGROUND: Preservation of hair grafts for the purpose of delayed transplantation would allow use of thousands of hair grafts at one time. OBJECTIVE: To evaluate the viabilities of hair follicle units preserved in DMEM and Ringer's solution at 0 degrees C for various periods. METHODS: Cell cultures and transplantation of hair follicle units into athymic mice were used. RESULTS: Outer root sheath cells could be cultivated in 95.8% of those follicles preserved in Ringer's solution, and in 86.7% of those preserved in DMEM culture medium (p < 0.01). In 84.5% of those preserved in Ringer's and 72.5% of those preserved in DMEM for 24 h, hair follicles grew well after implantation into an athymic mouse model (p < 0.05).     

复方过氧化氢消毒剂杀菌作用及其对室内空气消毒效果的研究

为观察复方过氧化氢消毒剂杀菌作用及对室内空气消毒效果,采用定量杀菌试验和现场消毒试验方法,进行了实验研究。结果,以含2500 mg/L过氧化氢与2500 mg/L碘化钾组成的复方消毒剂,对悬液内大肠杆菌和金黄色葡萄球菌作用5 m in,杀灭率均为100%。以含5000 mg/L过氧化氢与5000 mg/L碘化钾组成的复方消毒剂,按每8 m l/m3的该复方消毒剂对室内空气中人工污染的金黄色葡萄球菌、大肠杆菌、绿脓杆菌进行气溶胶喷雾,密闭作用30 m in,杀灭率均达到99.99%。用该复方消毒剂进行气溶胶喷雾对医院普通手术室等房间内空气中自然菌作用30 m in,杀灭率达到96%以上。结论,复方过氧化氢消毒剂具有较强的杀菌作用,用气溶胶喷雾方法对室内空气中自然菌杀灭效果可达到消毒合格要求。     

OmpA-VS2为靶基因的非标记实时荧光PCR检测沙眼衣原体感染

目的建立一种以OmpA-VS2为靶基因的非标记实时荧光聚合酶链反应(PCR)方法,以检测沙眼衣原体。方法设计15种型别沙眼衣原体通用引物,对OmpA-VS2进行套式PCR扩增和实时荧光PCR检测,并对其敏感性、特异性进行评价,并用临床标本进行验证。结果15种型别沙眼衣原体均扩增出168bp的目的片段;敏感性为每个反应1个拷贝。特异性分析可见,与10种泌尿生殖道病原体和共生菌均没有交叉反应。临床标本验证的结果显示,该方法与以质粒为靶基因的核酸扩增检测的Amplicor CT/NG方法的检测结果一致。结论该方法具有敏感性高、特异性强、扩增后无需PCR后处理等特点,可望用于临床与防治项目中沙眼衣原体的检测。     

2008-2010年我院抗组胺药应用分析

目的:分析中国医学科学院皮肤痛研究所抗组胺药的应用状况和趋势,为临床合理用药提供参考.方法:利用医院数据库,对我院2008-2010年抗组胺药的用药金额、用药频度(DDDa)和限定日费用(DDC)等进行统计分析.结果:我院抗组胺药用药金额呈逐年上升趋势,2008-2010年,我院抗组胺药用药金额分别为1147、1180...     

Antagomir Dependent MicroRNA-205 Reduction Enhances Adhesion Ability of Human Corneal Epithelial Keratinocytes

Objective To investigate the effect of microRNA-205 reduction by antagomirs on adhesion ability of normal human corneal epithelial keratinocytes（NHCEKs）.Methods Antagomir-205,complementary and inhibitory to microRNA-205,was used to suppress endogenous microRNA-205 in NHCEKs.The adhesion ability of treated NHCEKs was then assessed by cell adhesion assay.Immunoblot and immunohistochemistry were conducted to determine the level of two focal adhesion-related proteins,focal adhesion kinase（FAK） and paxillin（Pax）.Phalloidin staining was performed to measure the level of filamentous actin in antagomir-treated NHCEKs.Results Antagomir-205 markedly reduced the level of microRNA-205 in NHCEKs and significantly enhanced adhesion ability of NHCEKs（P〈0.01）.Further protein analysis validated that inhibition of mi-croRNA-205 increased the number of phosphorylated FAK and phosphorylated Pax,and decreased filamen-tous actin.Conclusion Our findings suggest that microRNA-205 has down-regulating effect on cell motility in NHCEKs.     

固相萃取-LC-MS/MS测定鸡蛋中氟喹诺酮类药物残留

目的:建立同时测定鸡蛋中诺氟沙星、氧氟沙星、培氟沙星、环丙沙星、洛美沙星、达氟沙星、恩诺沙星、沙拉沙星、二氟沙星残留的固相萃取-LC-MS/MS测定方法。方法:鸡蛋样品经乙腈沉淀蛋白质和正己烷脱脂后,过HLB固相萃取小柱净化,LC-MS/MS分析,流动相为乙腈-0.1%甲酸(13∶87),色谱柱为岛津Shim-packVP-ODSC18柱。结果:建立的固相萃取-LC-MS/MS选择性好,灵敏度和准确度均良好。结论:建立的方法可作为多种药物残留检测的常规方法。     

采用在体分时取样法研究2种咪喹莫特乳膏的裸鼠皮肤药动学行为

目的:采用裸鼠在体分时取样法比较国产和进口2种咪喹莫特乳膏的皮肤药动学行为。方法:分别在裸鼠相同面积的皮肤上涂抹2种乳膏各约0.03g(n=32)后,于0.25、0.5、1、2、4、6、8、24h取皮制备匀浆,采用高效液相色谱法测定皮肤中的药物浓度,比较2种制剂的药动学参数并计算偏差以对该方法进行评价。结果:国产和进口乳膏的咪喹莫特cmax分别为(82.80±8.13)、(76.46±13.08)μg·g-1,tmax分别为(6.0±0.0)、(5.0±1.2)h,t1/2分别为(25.28±4.27)、(23.30±7.42)h,AUC0～24h分别为(992.27±226.55)、(1037.02±175.93)μg·h·g-1,二者比较均无统计学差异(P>0.05)。2种制剂cmax、tmax、AUC0～24h的RSD分别为9.8%、17.1%,0、24.0%,22.8%、17.0%。结论:2种乳膏的裸鼠皮肤药动学行为无显著性差异;主要药动学参数的RSD偏差较小,表明在体给药分时取样法能较好地反映药物在裸鼠体内的经皮代谢过程,适用于临床前外用药物的皮肤药动学筛选与评价研究。