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Studies from Leiden University provide new data on photodynamics
2009 JUN 29 - (NewsRx.com) -- "Dermatophytes are fungi that cause infections of keratinized tissues. We have recently demonstrated the susceptibility of the dermatophyte Trichophyton rubrum to photodynamic treatment (PDT) with 5,10,15-Tris(4-methylpyridinium)-20-phenyl-[21H,23H]-porphine trichloride (Sylsens B) in 5 mm citric acid/sodium citrate buffer (pH 5.2, formulation I)," investigators in Leiden, Netherlands report. "In this work, we examined the penetration of Sylsens B in healthy and with T. rubrum infected skin and we investigated the susceptibility of T. rubrum to PDT using formulation I and UVA-1 radiation (340-550 nm). Skin penetration studies were performed with formulations I and II (Sylsens B in PBS, pH 7.4) applied on dermatomed skin, human stratum corneum (SC), disrupted SC by T. rubrum growth and SC pretreated with a detergent. No penetration was observed in healthy skin. Disruption of SC by preceding fungal growth caused Sylsens B penetration at pH 7.4, but not at pH 5.2. However, chemically damaged SC allowed Sylsens B to penetrate also at pH 5.2. UVA-1 PDT was applied ex vivo during two fungal growth stages of two T. rubrum strains (CBS 304.60 and a clinical isolate). Both strains could be killed by UVA-1 alone (40 J/cm(2)). Combined with formulation I (1 and 10 mu m Sylsens B for, respectively, CBS 304.60 and the clinical isolate), only 18 J/cm(2) UVA-1 was required for fungal kill. Therefore, PDT with 10 mu m Sylsens B (formulation I) and 18 J/cm(2) UVA-1 could be considered as effective and safe," wrote T.G.M. Smijs and colleagues, Leiden University. The researchers concluded: "This offers the possibility to perform clinical studies in future." Smijs and colleagues published their study in Photochemistry and Photobiology (Preclinical Studies with 5,10,15-Tris(4-Methylpyridinium)-20-Phenyl-[21H,23H]-Porphine Trichloride for the Photodynamic Treatment of Superficial Mycoses Caused by Trichophyton rubrum. Photochemistry and Photobiology, 2009;85(3):733-739). For additional information, contact T.G.M. Smijs, Leiden University, Medical Center, Leiden, Netherlands. The publisher of the journal Photochemistry and Photobiology can be contacted at: Wiley-Blackwell Publishing, Inc., Commerce Place, 350 Main St., Malden 02148, MA, USA. Keywords: Netherlands, Leiden, Biotechnology, Clinical Trial Research, Clinical Trials, Mycoses, Photobiology, Photochemistry, Photodynamics, Pre-Trials Research, Leiden University. This article was prepared by Biotech Business Week editors from staff and other reports. Copyright 2009, Biotech Business Week via NewsRx.com.
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