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Adv Hematol. 2010;2010:896161. doi: 10.1155/2010/896161. Epub 2010 Dec 12.

Photodynamic therapy with the silicon phthalocyanine pc 4 induces apoptosis in mycosis fungoides and sezary syndrome.

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Department of Dermatology, University Hospitals of Cleveland, Case Western Reserve University, 11100 Euclid Avenue, Lakeside 3500, Cleveland, OH 44106-5028, USA.


Our current focus on the effects of Photodynamic Therapy (PDT) using silicon phthalocyanine Pc 4 photosensitizer on malignant T lymphocytes arose due to preclinical observations that Jurkat cells, common surrogate for human T cell lymphoma, were more sensitive to Pc 4-PDT-induced killing than epidermoid carcinoma A431 cells. Mycosis fungoides (MF) as well as Sezary syndrome (SS) are variants of cutaneous T-cell lymphoma (CTCL) in which malignant T-cells invade the epidermis. In this study, we investigated the cytotoxicity of Pc 4-PDT in peripheral blood cells obtained from patients with SS and in skin biopsies of patients with MF. Our data suggest that Pc 4-PDT preferentially induces apoptosis of CD4(+)CD7(-) malignant T-lymphocytes in the blood relative to CD11b(+) monocytes and nonmalignant T-cells. In vivo Pc 4-PDT of MF skin also photodamages the antiapoptotic protein Bcl-2.

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