| Texto completo | |
| Autor(es): |
Linares, Irwin A. P.
;
Velasquez, Angela M. A.
;
Graminha, Marcia A. S.
;
de Oliveira, Kleber T.
;
Perussi, Janice Rodrigues
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Photodiagnosis and Photodynamic Therapy; v. 31, p. 9-pg., 2020-09-01. |
| Resumo | |
Leishmaniasis is a serious and neglected disease that affects 14 million people around the World. The currently available drugs for treatment present several drawbacks such as low efficacy and severe side effects, contributing to patients' low compliance. Photodynamic therapy (PDT) is rising as a promising treatment of cutaneous leishmaniasis, mainly considering its topical administration that circumvents any potential adverse effects commonly related to oral/parenteral administration. PDT depends on the interaction between a light-sensitive compound (photosensitizer - PS), light and molecular oxygen. The reaction generates reactive oxygen species (ROS) which induce cell death by oxidative stress. The main goal of this study is to demonstrate the antileishmanial effect of three chlorin derivatives (CHL-OH-A, CHL-OH-B, CHL-TRISMA) using PDT, as well as to investigate their cell death pathway on Leishmania amazonensis promastigote forms after chlorin-PDT application. The chlorin derivatives herein studied did not exhibit aggregates in aqueous medium and showed fast accumulation in Leishmania acidic compartments. CHL-OH-A exhibited the highest antiparasitic activity at 24 h (0.33 mu mol L-1) and 48 h (0.14 mu mol L-1) after irradiation at 660 nm (6.0 Jcm(-2)). CHL-OH-A, CHL-OH-B and CHL-TRISMA molecules induced the cell death of parasites mainly by an apoptotic-like process in the presence of light. These chlorin derivatives are 80-fold more active against Leishmania when compared to other PSs reported in the literature. In this study, we have shown that these amphiphilic chlorins, and in particular, CHL-OH-A, exert an interesting leishmanicidal activity suggesting that the use of these PSs associated with PDT could be a promising strategy for treatment of cutaneous leishmaniasis. (AU) | |
| Processo FAPESP: | 18/00106-7 - Reações Fotocatalisadas por Porfirinas em Condições de Fluxo Contínuo: Arilação de Sistemas Heterocíclicos e de Olefinas Ativadas |
| Beneficiário: | Kleber Thiago de Oliveira |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 17/03552-5 - Leishmanioses: do screening ao estudo de mecanismos de ação, uma contribuição para a descoberta de novas moléculas bioativas |
| Beneficiário: | Marcia Aparecida Silva Graminha |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 13/07276-1 - CEPOF - Centro de Pesquisa em Óptica e Fotônica |
| Beneficiário: | Vanderlei Salvador Bagnato |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 19/21661-1 - Nova visão sobre o mecanismo de ação do CP2 na Leishmania: análise da homeostase do cálcio e da cadeia respiratória |
| Beneficiário: | Angela Maria Arenas Velásquez |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |