Journal
PHOTOCHEMISTRY AND PHOTOBIOLOGY
Volume 96, Issue 3, Pages 604-610Publisher
WILEY
DOI: 10.1111/php.13188
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Funding
- Photonics Institute (INFO) from Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [465763/2014-6]
- Fundac ao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2012/24105-3]
- Comissao Nacional de Energia Nuclear (CNEN)
- CNPq
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Cutaneous leishmaniasis (CL) is a neglected disease that promotes destructive lesions. Difficulties in treatment are related to accessibility of drugs, resistance and toxicity. Antimicrobial photodynamic therapy (APDT) has been emerging as a promising treatment for CL. In this work, we evaluated methylene blue (MB)-mediated APDT (MB-APDT) on Leishmania amazonensis in vitro and in vivo by bioluminescence technique. In vitro, MB-APDT was performed using a red LED (lambda = 660 +/- 11 nm, 100 mW cm(-2)) and MB (100 mu m) at different light doses. In vivo, mice were infected and 4 weeks later, randomly divided into three groups: control, APDT 1 (single session) and APDT 2 (two sessions of MB-APDT). MB was used at 100 mu m and energy dose was established at 150 J cm(-2). Parasite burden, lesion size and pain were evaluated weekly for 4 weeks. In vitro, lethal dose for 90% parasite inactivation was achieved at 48.8 J cm(-2). In vivo, although APDT 1 and APDT 2 groups have showed similar parasite burden after 4 weeks, two sessions were clinically better, especially considering the inflammatory process associated to CL. Our findings reinforce MB-APDT as a cost-effective treatment to combat CL.
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