College of Science and Arts in Uniazah, Qassim University, Saudi Arabia.
College of Science and Arts in Ar Rass, Qassim University, Saudi Arabia.
Trop Biomed. 2020 Mar 1;37(1):15-23.
The organisms of the genus Leishmania are flagellated protozoan parasites and are the causative agents of leishmaniasis. This disease is a major health problem, especially in tropical countries. Currently, cutaneous leishmaniasis is treated by chemotherapy using pentavalent antimonials, but these drugs have serious organo-toxicity, drug resistance on several occasions, and low efficiency in controlling the infection. The present work is carried out to evaluate the in vitro antileishmanial activity of methanolic extracts and phytochemical fractions of two plants ethnobotanically used against leishmaniasis and skin infection, Calotropis procera and Rhazya stricta leaves against Leishmania major promastigote and amastigote stages and cytotoxicity against the Vero cell line. The leaves of C. procera and R. stricta were extracted with methanol and fractionated by petroleum ether, chloroform, ethyl acetate, n-butanol, and water. The methanolic extracts of the leaves of C. procera and R. stricta exhibited antileishmanial activity against L. major promastigotes with IC values of 66.8 and 42.4 µg mL, respectively. While their CC 2.3 and 298 µg mL and their SI 0.03 and 7.03 respectively. However, the fractionations of the methanolic extract of C. procera leaves revealed antiparasitic activity against both L. major promastigote and amastigote stages in vitro, which significantly increased with polarity with the exception of n-butanol. Hence the best activity was revealed by the water fraction (IC of 26.3 and 29.0 µg mL) for the two stages. In conclusion, further phytochemical investigation should be performed for the C. procera water extract in terms of antileishmanial active ingredient isolation that may enhance the possibility of avoiding toxic substances and overcome the low SI (1.1 and 1.01).
利什曼原虫属的生物是鞭毛原生动物寄生虫,是利什曼病的病原体。这种疾病是一个主要的健康问题,特别是在热带国家。目前,皮肤利什曼病通过使用五价锑的化疗来治疗,但这些药物具有严重的器官毒性、多次耐药性和对感染控制的低效率。本工作旨在评估两种植物的甲醇提取物和植物化学部分对利什曼原虫大滋养体和无鞭毛体阶段的体外抗利什曼活性,并评估对 Vero 细胞系的细胞毒性,这两种植物在民间医学上被用于治疗利什曼病和皮肤感染,即:牛角瓜和瑞香狼毒叶。用甲醇从牛角瓜和瑞香狼毒叶中提取,并通过石油醚、氯仿、乙酸乙酯、正丁醇和水进行部分分离。牛角瓜和瑞香狼毒叶的甲醇提取物对 L. major 大滋养体表现出抗利什曼活性,IC 值分别为 66.8 和 42.4 µg mL。而其 CC 为 2.3 和 298 µg mL,SI 为 0.03 和 7.03。然而,甲醇提取物的部分分离对 L. major 大滋养体和无鞭毛体阶段均显示出体外抗寄生虫活性,除了正丁醇外,极性的增加显著增加了这种活性。因此,水部分(对两个阶段的 IC 值为 26.3 和 29.0 µg mL)显示出最佳活性。总之,应该对牛角瓜的水提取物进行进一步的植物化学研究,以分离出抗利什曼的有效成分,这可能有助于避免毒性物质,并克服低 SI(1.1 和 1.01)。
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