School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.
Nanotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Pharmaceutical Nanotechnology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.
Acta Trop. 2019 Aug;196:142-149. doi: 10.1016/j.actatropica.2019.05.018. Epub 2019 May 16.
Herein, we investigated the efficacy of liposomes for the topical delivery of miltefosine (ML) to treat cutaneous leishmaniasis (CL). Liposomes containing varying concentrations of ML (0.5, 1, 2 and 4%) were prepared and characterized by their size and entrapment efficiency. The liposome diameters were between 100-150 nm. The penetration of ML from liposomal formulations through and in the skin was assessed using ex-vivo Franz diffusion cells fitted with mouse skin at 37 °C for 24 h. Data indicated that Lip-ML-4% showed the highest percent of retention across mouse skin (82%). in vitro promastigote and amastigote assays showed that ML and Lip-ML inhibit the growth of parasites either in the culture medium or intracellularly. Lip-ML formulations were topically applied twice a day for 4 weeks to the skin of BALB/c mice infected with L. major. Results showed a significantly (p < 0.001) smaller lesion size in Lip-ML-2 and 4% when compared to controls. At week 8 post-infection, the number of parasites was higher in Lip-ML-0.5% compared to Lip-ML-2 and 4%, however, the difference was not significant. At week 12, the splenic parasite burden was significantly (p < 0.001) lower in mice treated with different Lip-ML formulations when compared to controls. The lesion parasite burden was significantly (p < 0.001) lower in mice treated with either Lip-ML-2 and 4% compared to Lip-ML-0.5% at week 12 post-infection. The results suggested that topical Lip-ML-4% showed optimal ex-vivo penetration and in vivo anti-leishmanial activity against CL caused by L. major when compared to ML cream and other liposomes and thus, merits further investigation.
在此,我们研究了脂质体将米替福新(ML)递送至皮肤利什曼病(CL)进行局部治疗的功效。通过其大小和包封效率来制备并表征包含不同浓度 ML(0.5%、1%、2%和 4%)的脂质体。脂质体的直径在 100-150nm 之间。使用配备有 37°C 下的小鼠皮肤的体外 Franz 扩散细胞,评估 ML 从脂质体制剂中通过并在皮肤中的渗透情况,持续 24 小时。数据表明 Lip-ML-4%显示出跨小鼠皮肤的最高保留百分比(82%)。体外前鞭毛体和无鞭毛体试验表明,ML 和 Lip-ML 无论是在培养基中还是细胞内都抑制寄生虫的生长。将 Lip-ML 制剂每天两次施用于感染 L. major 的 BALB/c 小鼠的皮肤,持续 4 周。结果表明,与对照组相比,Lip-ML-2%和 4%的病变面积明显(p<0.001)更小。在感染后第 8 周,与 Lip-ML-2%和 4%相比,Lip-ML-0.5%中的寄生虫数量更高,但是差异不显著。在第 12 周,与对照组相比,用不同的 Lip-ML 制剂治疗的小鼠的脾脏寄生虫负担显著(p<0.001)降低。在感染后第 12 周,与 Lip-ML-0.5%相比,用 Lip-ML-2%和 4%治疗的小鼠的病变寄生虫负担明显(p<0.001)降低。结果表明,与 ML 乳膏和其他脂质体相比,局部应用 Lip-ML-4%显示出最佳的体外渗透和对由 L. major 引起的 CL 的体内抗利什曼原虫活性,因此值得进一步研究。
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