Antimicrobial photodynamic therapy (aPDT) with curcumin controls intradermal infection by Staphylococcus aureus in mice with type 1 diabetes mellitus: a pilot study

Methicillin-resistant Staphylococcus aureus (MRSA) is one of the main pathogens that cause infections in diabetic individuals. In this paper, we report the outcomes of our investigation on the intradermal application of antimicrobial photodynamic therapy (PDT) with curcumin in an infection induced b...

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Published in:	Journal of photochemistry and photobiology. B, Biology Vol. 224; p. 112325
Main Authors:	Muniz, Igor Pereira Ribeiro, Galantini, Maria Poliana Leite, Ribeiro, Israel Souza, Gonçalves, Caroline Vieira, dos Santos, Denisar Palmito, Moura, Tatyana Chagas, Silva, Emely Soares, Silva, Nathalia Rosa, Cipriano, Barbara Porto, Correia, Thiago Macêdo Lopes, de Jesus Soares, Telma, de Freitas, Leandro Martins, Costa, Dirceu Joaquim, da Silva, Robson Amaro Augusto
Format:	Journal Article
Language:	English
Published:	Switzerland Elsevier B.V 01-11-2021 Elsevier BV
Subjects:	Animals Antiinfectives and antibacterials Antimicrobial resistance Biomarkers - metabolism Curcumin Curcumin - therapeutic use Cytokines Diabetes Diabetes mellitus Diabetes mellitus (insulin dependent) Diabetes Mellitus, Type 1 - complications Drug resistance Ear IL-1β Infection treatment Infections Inflammation Inflammation Mediators - metabolism Inflammatory response Inoculum Interleukin 10 Interleukin 12 Lymph nodes Lymphatic system Methicillin Methicillin-Resistant Staphylococcus aureus - isolation & purification Mice Mice, Inbred C57BL Microbiology Nitrites Peroxidase Photochemotherapy Photodynamic therapy Pilot Projects Skin Diseases, Bacterial - complications Skin Diseases, Bacterial - drug therapy Skin Diseases, Bacterial - microbiology Staphylococcal Infections - complications Staphylococcal Infections - drug therapy Staphylococcal Infections - microbiology Staphylococcus aureus Staphylococcus infections Streptozocin Type 1 diabetes mellitus Infection treatment Antimicrobial resistance Microbiology Type 1 diabetes mellitus
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Summary:	Methicillin-resistant Staphylococcus aureus (MRSA) is one of the main pathogens that cause infections in diabetic individuals. In this paper, we report the outcomes of our investigation on the intradermal application of antimicrobial photodynamic therapy (PDT) with curcumin in an infection induced by MRSA ATCC 43300 strain in the ear of mice with Type 1 Diabetes Mellitus (T1DM). A solution containing 100 μg of curcumin was photoactivated ex vivo with a LED light (450 nm) delivering a fluency of 13.5 J/cm3. This solution was administered in the ear intradermally, at the same inoculum site as the MRSA ATCC 43300 strain (PDT Group). This study also included the use of two control groups (both infected): One was treated with saline and the other was treated with non-photoactivated curcumin. The animals were euthanized 24 h after these treatments and samples of draining lymph node and treated ear were collected for examination. The PDT group showed lower bacterial load in the draining lymph node when compared to the saline and curcumin groups (p-value <0.05) 24 h after treatment. In addition to bacterial load, the PDT group presented a higher concentration of nitrates and nitrites in the draining lymph node when compared to the saline and curcumin groups (p-value <0.001). Examining the infectious site, despite apparently having similar inflammatory cell recruitment compared with the control groups, the PDT group showed a profile with less intense activity in the myeloperoxidase expression when compared to the saline group (p-value <0.001). Additionally, the detected concentration of cytokines such as IL-1β, IL-12, and IL-10 was significantly lower in the PDT group when compared to the saline group (p-value <0.01; p-value <0.05; p-value <0.05, respectively), thus presenting a less intense inflammatory response during infection resolution. Our pilot study showed for the first time the therapeutic potential of PDT using curcumin when administered intradermally in the treatment of infections caused by S. aureus in mice with T1DM. •PDT acts to control bacterial load in infected mice with type 1 diabetes.•PDT using curcumin has therapeutic effect when used to control bacterial load in vivo.•The expression of inflammatory markers can be modulated by PDT.•Free radicals production is increased in diabetic organisms when treated with PDT.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1011-1344 1873-2682
DOI:	10.1016/j.jphotobiol.2021.112325