Sunlight triggered photodynamic ultradeformable liposomes against Leishmania braziliensis are also leishmanicidal in the dark

• Autores: Montanari, Jorge; Maidana, Cristina Graciela; Esteva, Monica I; Salomon, Cristina; Morilla, Maria Jose; Romero, Eder L
• Año de publicación: 2010
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: Journal of Controlled Release 2010; 147(3):368-76.
• Materia: Leishmania; Fotoquimioterapia
• Institución: Administración Nacional de Laboratorios e Institutos de Salud "Dr. Carlos G. Malbrán"

Fil: Montanari, Jorge. Programa de Nanomedicinas, Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Buenos Aires; Argentina.
Fil: Maidana, Cristina Graciela. ANLIS Dr.C.G.Malbrán. Instituto Nacional de Parasitología; Argentina.
Fil: Esteva, Monica I. ANLIS Dr.C.G.Malbrán. Instituto Nacional de Parasitología; Argentina.
Fil: Salomon, Cristina. Área Microbiología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza; Argentina.
Fil: Morilla, Maria Jose. Programa de Nanomedicinas, Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Buenos Aires; Argentina.
Fil: Romero, Eder L. Programa de Nanomedicinas, Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Buenos Aires; Argentina.
Being independent of artificial power sources, self administered sunlight triggered photodynamic therapy could be a suitable alternative treatment for cutaneous leishmaniasis, that avoids the need for injectables and the toxic side effects of pentavalent antimonials. In this work we have determined the in vitro leishmanicidal activity of sunlight triggered photodynamic ultradeformable liposomes (UDL). ZnPc is a hydrophobic Zn phthalocyanine that showed 20% anti-promastigote activity (APA) and 20% anti-amastigote activity (AA) against Leishmania braziliensis (strain 2903) after 15min sunlight irradiation (15J/cm(2)). However, when loaded in UDL as UDL-ZnPc (1.25μM ZnPc-1mM phospholipids) it elicited 100% APA and 80% AA at the same light dose. In the absence of host cell toxicity, UDL and UDL-ZnPc also showed non-photodynamic leishmanicidal activity. Confocal laser scanning microscopy of cryosectioned human skin mounted in non-occlusive Saarbrücken Penetration Model, showed that upon transcutaneous administration ZnPc penetrated nearly 10 folds deeper as UDL-ZnPc than if loaded in conventional liposomes (L-ZnPc). Quantitative determination of ZnPc confirmed that UDL-ZnPc penetrated homogeneously in the stratum corneum, carrying 7 folds higher amount of ZnPc 8 folds deeper than L-ZnPc. It is envisioned that the multiple leishmanicidal effects of UDL-ZnPc could play a synergistic role in prophylaxis or therapeutic at early stages of the infection.