Anti-Tumor Efficacy of Pyrvinium Pamoate Nanoliposomes in an Experimen-tal Model of Melanoma

Background: Pyrvinium Pamoate (PP) is an old drug approved by the FDA for the treatment of pin-worm infections. Recently, it has been introduced as an anti-tumor agent, however, low aqueous solubility severely limits its potential effects. In this study, we developed a liposomal formulation of pyrvinium pamoate to investigate its in vitro cytotoxicity and in vivo efficacy against melanoma cells. Materials & Methods: As drug carriers, liposomes were fabricated using the thin-film method. PP was encapsu-lated within the liposomes using a remote loading method. We evaluated the morphology, particle size, and Ze-ta potential of the liposomes. Additionally, High-Performance Liquid Chromatography (HPLC) was employed for qualitative and quantitative analysis. Then we investigated our liposomal PP for its in vitro cytotoxicity as well as the tumor growth inhibition in C57BL/6 mice bearing B16F0 melanoma tumors. Results: Based on the analytical result, the liposomal drug delivery system is a homogeneous and stable colloi-dal suspension of PP particles. The images of Atomic force microscopy and particle size data showed that all the prepared nanocarriers were spherical with a diameter of approximately 101 nm. According to both in vitro and in vivo studies, nanoliposomal PP exhibited an improved anti-proliferative potential against B16F10 me-lanoma tumor compared to free PP. Conclusion: Liposomal encapsulation improves the water solubility of PP and enhances its anti-cancer activity.