High-resolution melt curve analysis: A real-time based multipurpose approach for diagnosis and epidemiological investigations of parasitic infections

BackgroundReal-time PCR coupled with high resolution melting curve analysis is a practical technique that could be employed in multipurpose studies. During the recent decade, this technique has been practiced for different targets, worldwide.MethodsIn the current study three major database centers consisted of PubMed, Scopus and Web of Science were searched until Aug 2019 for applications of HRM real-time PCR in parasitology studies using terms: “Parasite” AND “HRM real-time PCR” OR “High Resolution Melting curve analysis” OR “Real-time PCR”, “Protozoan parasites” AND “HRM real-time PCR” OR “High Resolution Melting curve analysis” OR “Real-time PCR”, “Helminth” AND “HRM real-time PCR” OR “High Resolution Melting curve analysis” OR “Real-time PCR”.ResultsTotally, 83 papers met our criteria and were included in our study. This method was more frequently used for protozoan parasites (52/83; 62.65%), while lower (31/83; 37.35%) studies were incorporated on helminths parasites. Furthermore, Plasmodium spp., and Leishmania spp., were the most prevalent protozoan parasites, and Taenia spp., and filers were the most frequent helminths that were studied by HRM real-time PCR.ConclusionHRM real-time PCR is a sensitive, flexible and cost-effective method that could be used for multipurpose studies.     

鸡矢藤乙醇提取液体外抑菌活性与体内抗炎镇痛作用研究

【目的】探索鸡矢藤有效活性成分的体外抑菌效果、体内抗炎镇痛作用，为充分利用鸡矢藤资源 提供理论依据。【方法】用 40% 乙醇溶液提取鸡矢藤，对所得提取物进行化学成分预试分析；采用药敏试验和 二倍梯度稀释法检测其对大肠杆菌、沙门氏菌、金黄色葡萄球菌和蜡状芽孢杆菌的抑菌活性，测定 MIC；探究 鸡矢藤对二甲苯所致小鼠耳廓肿胀、角叉莱胶所致小鼠 足跖肿胀的抗炎作用；并研究鸡矢藤对冰醋酸所致小鼠 扭体疼痛的镇痛作用。【结果】鸡矢藤乙醇提取液含有黄酮、萜类内酯等多种有效化学成分；能够抑制蜡状芽 胞杆菌生长，抑菌圈直径为 8.55 mm，MIC 为 500 mg/mL，但对大肠杆菌、沙门氏菌和金黄色葡萄球菌的抑菌效 果不明显；与对照处理相比，中、高剂量鸡矢藤提取液对二甲苯所致小鼠耳廓炎性肿胀的抑制率分别为 30.93% 和 55.00%，对角叉莱胶所致小鼠足跖肿胀的抑制率分别为 49.74% 和 58.26%，抗炎作用极显著，且能够有效缓 减冰醋酸引起的小鼠外周性疼痛，使小鼠首次出现扭体反应的时间延迟，15 min 内出现扭体反应的次数减少。 【结论】鸡矢藤乙醇提取液含有丰富的药效活性成分，体外抑菌效果较弱，但对试验小鼠抗炎和镇痛作用显著， 可作为畜禽饲料添加剂候选中草药资源。