蝎肽抗菌凝胶治疗急性放射性皮炎的临床疗效观察

目的研究蝎肽抗菌凝胶对急性放射性皮炎的治疗作用。方法将接受放射治疗后出现急性放射性皮炎的102例患者,创面清洁后,随机分为研究组(n=53)和对照组(n=49),研究组以蝎肽抗菌凝胶均匀涂于创面,对照组以生理盐水、庆大霉素、地塞米松溶液持续湿敷,两组均每天换药3次,治疗14天;观察两组皮肤愈合情况、愈合时间、放疗中断时间以及不良反应发生情况,治疗前后进行放射性皮肤损伤评估量表(RISRAS)评定。结果与对照组相比,研究组治愈率和总有效率均显著增高(54.7%vs 26.5%,88.7%vs 63.3%),差异有统计学意义(P0.05);平均治愈时间明显缩短[(6.23±2.62)天vs(10.43±2.45)天,P0.05];研究组治疗后RISRAS评分低于对照组[(2.44±1.21)vs(3.23±1.31),P0.05];研究组放疗中断时间为(6.39±2.12)天,明显短于对照组(11.37±3.05)天,差异有统计学意义(P0.05)。结论蝎肽抗菌凝胶能有效治疗急性放射性皮炎,对各级皮损均有显著疗效,可明显缩短治愈时间和放疗中断时间,无不良反应。     

蝎毒多肽干预CML K562细胞Hedgehog通路上游 活化因子的分子机制研究

摘要：目的 观察蝎毒多肽提取物（PESV）对K562细胞Hedgehog通路上游活化因子的影响并探讨分子调节机 制。方法 体外培养K562细胞,接种于24孔培养板,治疗组分别加入低、中及高浓度（10、20及40 mg/L）PESV 20 μL,阳性对照加入2 g/L的甲磺酸伊马替尼（GLEEVEC）20 μL（GLEEVEC组）,阴性对照组加入生理盐水20 μL,共培 养48 h,应用Real-time PCR及Western blot法检测K562细胞BCR/ABL基因mRNA及融合蛋白P210bcr/abl表达的变化, 并检测Hedgehog通路上游活化因子Shh、Smo、Ptch mRNA及蛋白的表达。结果 与阴性对照组比较,PESV各剂量组 对K562细胞BCR/ABL融合基因mRNA及P210bcr/abl蛋白的表达均有不同程度的抑制作用（P＜0.05）;与阴性对照组比 较,中、高剂量组Shh、Smo、Ptch 基因mRNA 及蛋白在K562细胞中的表达水平均降低（P＜0.05）;与GLEEVEC 组比 较,中、高剂量组Shh、Smo、Ptch基因相对表达水平差异均无统计学意义,但低剂量组均升高（P＜0.05）。结论 PESV 可以抑制K562细胞BCR/ABL融合基因及P210bcr/abl蛋白的表达,并通过抑制Hedgehog通路上游活化因子的表达阻断 该通路的激活,进而抑制慢性粒细胞白血病的进展。     

一种快速检测HBV基因的荧光定量PCR法的建立

目的：利用二聚体蝎型荧光探针技术,建立一种能用于临床的快捷、敏感、特异、价格低廉的HBV实时荧光定量PCR检测方法。方法：根据HBV基因组保守区域precore／core设计二聚体蝎型荧光探针和引物,构建质粒标准品,优化荧光定量PCR条件,并进行方法学评价。结果：所建方法的检测范围为10^1～10^8 copies／μl,灵敏度达到10copies／μl,低拷贝样品的批内和日间重复性（CV）分别为1．71％和2．57％,高拷贝样品的批内和日间GV,分别为3．00％和3．86％。与商品化TaqMan试剂盒相比,本法阳性检出率较高,且检测时间缩短了45min（约减少1／3）,成本降低50％。结论：成功建立了快速检测HBVDNA的二聚体蝎型荧光定量PCR方法,为研发适合临床应用的HBV基因定量检测试剂盒奠定了基础。     

Scorpion Toxin,BmP01, Induces Pain by Targeting TRPV1 Channel

The intense pain induced by scorpion sting is a frequent clinical manifestation. To date, there is no established protocol with significant efficacy to alleviate the pain induced by scorpion envenomation. One of the important reasons is that, little information on pain-inducing compound from scorpion venoms is available. Here, a pain-inducing peptide (BmP01) has been identified and characterized from the venoms of scorpion (Mesobuthus martensii). In an animal model, intraplantar injection of BmP01 in mouse hind paw showed significant acute pain in wild type (WT) mice but not in TRPV1 knock-out (TRPV1 KO) mice during 30 min recording. BmP01 evoked currents in WT dorsal root ganglion (DRG) neurons but had no effect on DRG neurons of TRPV1 KO mice. Furthermore, BmP01 evoked currents on TRPV1-expressed HEK293T cells, but not on HEK293T cells without TRPV1. These results suggest that (1) BmP01 is one of the pain-inducing agents in scorpion venoms; and (2) BmP01 induces pain by acting on TRPV1. To our knowledge, this is the first report about a scorpion toxin that produces pain by targeting TRPV1. Identification of a pain-inducing compound may facilitate treating pain induced by scorpion envenomation.     

AaeAP1 and AaeAP2: Novel Antimicrobial Peptides from the Venom of the Scorpion,Androctonus aeneas: Structural Characterisation,Molecular Cloning of Biosynthetic Precursor-Encoding cDNAs and Engineering of Analogues with Enhanced Antimicrobial and Anticancer Activities

The main functions of the abundant polypeptide toxins present in scorpion venoms are the debilitation of arthropod prey or defence against predators. These effects are achieved mainly through the blocking of an array of ion channel types within the membranes of excitable cells. However, while these ion channel-blocking toxins are tightly-folded by multiple disulphide bridges between cysteine residues, there are additional groups of peptides in the venoms that are devoid of cysteine residues. These non-disulphide bridged peptides are the subject of much research interest, and among these are peptides that exhibit antimicrobial activity. Here, we describe two novel non-disulphide-bridged antimicrobial peptides that are present in the venom of the North African scorpion, Androctonus aeneas. The cDNAs encoding the biosynthetic precursors of both peptides were cloned from a venom-derived cDNA library using 3''- and 5''-RACE strategies. Both translated precursors contained open-reading frames of 74 amino acid residues, each encoding one copy of a putative novel nonadecapeptide, whose primary structures were FLFSLIPSVIAGLVSAIRN and FLFSLIPSAIAGLVSAIRN, respectively. Both peptides were C-terminally amidated. Synthetic versions of each natural peptide displayed broad-spectrum antimicrobial activities, but were devoid of antiproliferative activity against human cancer cell lines. However, synthetic analogues of each peptide, engineered for enhanced cationicity and amphipathicity, exhibited increases in antimicrobial potency and acquired antiproliferative activity against a range of human cancer cell lines. These data clearly illustrate the potential that natural peptide templates provide towards the design of synthetic analogues for therapeutic exploitation.     

Comments on Environmental and Sanitary Aspects of the Scorpionism by Tityus trivittatus in Buenos Aires City,Argentina

Deaths by venomous animals are medical emergencies that can lead to death and thus constitute sanitary problems in some regions of the world. In the South of America, the accidents by these animals are a common sanitary problem especially in warm, tropical or subtropical regions, related with rural work in several countries. Argentina is located in the extreme South of South America and a minor part of the continental surface is in tropical or subtropical regions, where most of the accidents by venomous animals happen. However, in the big cities in the center and South of the country, with no relation to rural work, scorpionism, mostly due to the synanthropic and facultative parthenogenetic scorpion Tityus trivittatus, has become a sanitary problem in the last few decades. This scorpion is present in the biggest cities of Argentina and in the last decades has killed over 20 children in provinces of the center and north of the country, mostly in big cities. In addition, it seems that this species is growing and spreading in new regions of the cities. In this revision, some characteristics of this scorpion regarding its habitat, spreading in Buenos Aires city, combat measures and available treatments are discussed.     

基于毒素多肽BmK NaTx-13的全蝎质控工艺研究

目的 基于毒素多肽建立一种新型的全蝎质量检测工艺。方法 从东亚钳蝎毒液中分离得到了一种新型钠通道毒素BmK NaTx-13,制备并鉴定了BmK NaTx-13的特异性抗体,并通过竞争性ELISA法检测全蝎提取物中的BmK NaTx-13的含量。结果 建立的竞争性酶联免疫吸附法可快速检测全蝎提取物中的BmK NaTx-13的含量并呈现良好的浓度线性依赖。结论 该研究为全蝎质控提供了一种快速免疫检测方法,为提升全蝎入药质量标准提供了借鉴。      

Chinese herbal compounds containing scorpion in the treatment of epilepsy: A protocol for systematic review and meta-analysis

Background:Epilepsy is 1 of the common neurodevelopmental diseases. It can affect about 0.5% to 1.0% of the population regardless of their race and social class. Despite the development of a wide range of treatments, there remaining about one-third of patients still experience seizures. Chinese herbal compounds containing scorpion (CHCCS) have shown an outstanding curative effect on nerve protection and epilepsy. But there''s no study to assess its clinical efficacy and safety.Methods:Each data of CHCCS in treating epilepsy from related English and Chinese databases will be searched. The primary outcome is the efficacy of the CHCCS on epilepsy. And the secondary outcomes include recurrence rate and side effects. The risk of bias will be assessed, and RevMan5.3 and Stata14.0 will be performed for meta-analysis. Finally, we will assess the level of the resulting evidence.Results:The results of the study will be combined with current evidence and published in a peer-reviewed journal.Conclusions:This study will specifically investigate the effectiveness and safety of CHCCS in treating epilepsy.INPLASY registration number:INPLASY202120056.     

荧光定量PCR检测梅毒螺旋体方法的建立及初步应用

目的采用二聚体蝎型探针技术建立一种高敏感性和特异性的检测梅毒螺旋体(TP)的荧光定量聚合酶链反应(PCR)方法。方法根据TP特异性外膜蛋白Gpd的基因序列设计引物和荧光探针,采用基因工程技术构建可用于TP定量的标准品,优化荧光定量PCR的反应体系和反应条件,建立检测TP的二聚体蝎型探针定量PCR。采用本研究建立方法和商品化荧光定量PCR试剂盒检测40例临床标本,对比分析检测结果的统计学差异。结果成功构建了TP重组质粒标准品和TP的二聚体蝎型探针定量PCR,该方法线性范围为101~108 copy/mL,灵敏度为10copy/mL,特异性和敏感性均为100.0%;二聚体蝎型探针定量PCR对疑似梅毒病例阳性检出率显著高于目前商品化Taqman荧光定量PCR试剂盒(82.5%vs 62.5%,P0.05)。结论成功建立了二聚体蝎型探针荧光定量PCR快速检测TP的方法,为临床上TP的早期诊断和防控奠定了基础。     

Posterior Reversible Encephalopathy Syndrome Following a Scorpion Sting

Posterior reversible encephalopathy syndrome (PRES) is a clinicoradiologic entity not yet understood, that is present with transient neurologic symptoms and particular radiological findings. The most common imaging pattern in PRES is the presence of edema in the white matter of the posterior portions of both cerebral hemispheres. The cause of PRES is unclear. We report a case of 13‐year‐old male who was stung by a scorpion and developed a severe headche, visual disturbance, and seizures and had the diagnosis of PRES with a good outcome. Numerous factors can trigger this syndrome, most commonly: acute elevation of blood pressure, abnormal renal function, and immunosuppressive therapy. There are many cases described showing the relationship between PRES and eclampsia, transplantation, neoplasia and chemotherapy treatment, systemic infections, renal disease acute, or chronic. However, this is the first case of PRES following a scorpion sting.