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Photodynamic acidification therapy

Einar K Rofstad, Berit Mathiesen, Kristil Kindem, Kanthi Galappathi
Extracellular pH (pH(e)) is lower in many tumors than in the corresponding normal tissue. The significance of acidic pH(e) in the development of metastatic disease was investigated in the present work. Human melanoma cells (A-07, D-12, and T-22) were cultured in vitro at pH(e) 6.8 or 7.4 (control) before being inoculated into the tail vein of BALB/c nu/nu mice for formation of experimental pulmonary metastases. Cell invasiveness was studied in vitro by using Matrigel invasion chambers and angiogenesis was studied in vivo by using an intradermal assay...
July 1, 2006: Cancer Research
A Viola, N W Lutz, C Maroc, C Chabannon, M Julliard, P J Cozzone
Victoria Blue BO (VB BO) is a new and promising photosensitizer currently being evaluated for photodynamic therapy (PDT). Its photochemical processes are mediated by oxygen radicals, but do not involve singlet oxygen. We used (31)P NMR spectroscopy of VB-BO sensitized TF-1 leukemic cells to gain further insight into the biochemical mechanisms underlying PDT-induced cell death. Sham-treatment experiments were performed to evaluate the effects of this photosensitizer in the absence of light irradiation. Significant metabolic differences were detected for TF-1 cells incubated with VB BO but not exposed to light, as compared with native cells (controls)...
March 1, 2000: International Journal of Cancer. Journal International du Cancer
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