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]. Cosmet. Sci., 56, 279-280 CTuly/August 2005) Abstracts International Journal of Cosmetic Science Vol. 27, No. 3, 2005* Glutathione as a depigmenting agent: an overview Clarissa D. Villarama, and Howard I. Maibach University of the Philippines, College of Medicine, Manila, Philippines Glutathione is an ubiquitous compound found in our bodies. Aside from its many ascribed biologic functions, it has also been implicated in skin lightening. We review in vitro and in vivo studies that show evidence of its involvement in the melanogenic pathway and shed light on the its anti-melanogenic effect. Proposed mechanisms of action include a) direct inactivation of the enzyme tyrosinase by binding with the copper-containing active site of the enzyme b) mediating the switch mechanism from eumelanin to phaeomelanin production c) quenching of free radicals and peroxides that contribute to tyrosinase activation and melanin formation and d) modulation of depigmenting abilities of melanocytotoxic agents. These concepts supported by the various experimental evidence presented form basis for future research in the use of glutathione in the treatment of pigmentary disorders. An optimized method for intensive screening of molecules that stimulate B-defensin 2 or 3 (hBD2 or hBD3) expression in cultured normal human keratinocytes. Pernet I, Reymermier C, Guezennec A, Viac J, Guesnet J, Perrier£ COLETICA, Lyon, France Normal human skin controls the intrusion of microorganisms by the production of peptide antibiotics such as defensins. The aim of our study was to develop a culture model of normal human keratinocytes for optimal 8 -defensin mRN A detection which allows the screening of molecules able to stimulate hBD2 and hBD3 without inducing pro-inflammatory cytokines. A keratinocyte culture model in 96-well plates, in high calcium medium (l.7mM) allowed to analyze hBD2 and hBD3 mRNA expression in basal condition and after cell stimulation by products from diverse vegetal extracts. The release of IL-8 and the chemokine MIP-3 [_] was also evaluated in cell supernatants by ELISA Among the 184 extracts tested, 75 showed a stimulatory effect on 8 -defensin expression: 40 on hBD2, 26 on hBD3 and 9 on both defensins. 15 of these substances which also induced the release of proinflammatory cytokines were eliminated. Among the other substances, 4 were selected and were analyzed in a dose-dependent study (n=4) by real-time quantitative RT­ PCR and completed by a measure of MIP-3O, IL-8 and IL­ I □ levels. These data underline the important necessity of screening result controls by a quantitative method reproduced at least 3 times. This new method of intensive screening allowed us to exhibit vegetal extracts that were able to stimulate epidermal 8 -defensin expression without inducing an up-secretion of proinflammatory cytokines. Sodium Ascorbyl Phosphate shows in vitro and in vivo efficacy in the prevention and treatment of acne vulgaris Jochen Klock, Hiroshi Ikeno, Kitaro Ohmori, Takeshi Nishikawa, Jilrgen Vollhardt, Volker Schehlmann R&D Personal Care, DSM Nutritional Products Ltd., Basel, Switzerland Acne vulgaris is the most common inflammatory skin disorder and jeopardizes seriously the facial impression of a person. Development of acne involves a complex relation among several causes. Treatment and prevention success can be archived by affecting the main contributors positively like Proprionibacterium acnes or lipid oxidation leading to inflammatory reactions and follicular keratinization. Vitamin C tends to break down in cosmetic formulations resulting in a brownish discoloration. Sodium Ascorbyl Phosphate represents a stable precursor of vitamin C that ensures a constant delivery of vitamin C into * These abstracts appear as they were originally published. They have not been edited by the Journal of Cosmetic Science. 279