Dr. Oleg E. Akilov Profile

Dr. Oleg E. Akilov

Instructor at Wellman Ctr for Photomedicine

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Proceedings Article | 13 July 2009

Photochemistry-based immune modulation in the treatment of cutaneous leishmaniasis

Oleg Akilov, Sachiko Kosaka, Tayyaba Hasan

Proc. SPIE. 7380, Photodynamic Therapy: Back to the Future

KEYWORDS: Magnesium, Photodynamic therapy, Modulation, Tissues, Resistance, Control systems, Bone, Ear, Picosecond phenomena, Lymphatic system

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The destruction of infectious pathogens by photodynamic therapy (PDT) is an emerging modality. We demonstrated the efficacy of PDT for the management of cutaneous leishmaniasis in our previous studies. However, much remains to be done for the improvement of PDT regimens. The modulation of the immune response by photochemistry is an exciting but under-explored area of PDT research. The goal of this study is to understand the mechanisms of the augmentation of the host immune response after PDT of cutaneous leishmaniasis (CL). We found that PDT with phenoxiazine analogues was capable for induction of Th1 immune response due to stimulation of IL- 12 production by dendritic cells. Single PDT treatment facilitated fast healing of the CL lesions due to effective parasite eradication and augmentation of the immune system. Comparative study with different photosensitizers (PS) (porphyrins, pehnoxiazines) demonstrated different immunomodulating properties of PDT depending on chemical class of PS. Knowing the particular profiles and immunomodulating properties of the pertinent PSs allows us to select the optimal PS with regards to both the photodestructive and immunostimulating potential.

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