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Pigmentation

1024

Deoxyvasicinone with Anti-Melanogenic Activity from Marine-Derived Streptomyces sp. CNQ-617

The tricyclic quinazoline alkaloid deoxyvasicinone (DOV, 1) was isolated from a marinederived Streptomyces sp. CNQ-617, and its anti melanogenic effects were investigated. Deoxyvasicinone was shown to decrease the melanin content of B16F10 and MNT-1 cells that have been stimulated by α-melanocyte-stimulating hormone (α-MSH). In addition, microscopic images of the cells showed that deoxyvasicinone attenuated melanocyte […]
1021

16-Kauren-2-beta-18,19-triol inhibits melanosome transport in melanocytes by down-regulation of melanophilin expression

Rab27a, Mlph, and MyoVa form a tripartite complex and relate to melanosome distribution. Melanophilin (Mlph) acts as a linker protein between Rab27a and MyoVa. The biological activity and function of 16-kauren on the expression of Mlph has not yet been studied.
897

Evaluation of phototoxicity of tattoo pigments using the 3 T3 neutral red uptake phototoxicity test and a 3D human reconstructed skin model

Phototoxicity due to dermally impregnated compounds exposed to ultraviolet radiation is associated with skin inflammation. The phototoxicity potential of active substances applied to the skin should be evaluated. Pigments are widely used for tattoos, and hypersensitivity reactions, such as photoallergic dermatitis, are possible tattoo related complications. However, the phototoxicity of these chemicals is not well […]
894

Anti-Aging Potentials of Methylene Blue for Human Skin Longevity

Oxidative stress is the major cause of skin aging that includes wrinkles, pigmentation, and weakened wound healing ability. Application of antioxidants in skin care is well accepted as an effective approach to delay the skin aging process. Methylene blue (MB), a traditional mitochondrial-targeting antioxidant, showed a potent ROS scavenging efficacy in cultured human skin fibroblasts […]
877

Antimelanogenic Efficacy of Melasolv (3,4,5-Trimethoxycinnamate Thymol Ester) in Melanocytes and Three-Dimensional Human Skin Equivalent

Background/Aims: Excessive melanogenesis often causes unaesthetic hyperpigmentation. In a previous report, our group introduced a newly synthesized depigmentary agent, Melasolv TM (3,4,5-trimethoxycinnamate thymol ester). In this study, we demonstrated the significant whitening efficacy of Melasolv using various melanocytes and human skin equi valents as in vitro experimental systems. Methods: The depigmentary effect of Melasolv was […]
869

Coumestrol Down-Regulates Melanin Production in Melan-a Murine Melanocytes through Degradation of Tyrosinase

Pigmentation reflects skin darkening caused by melanin production, but excessive melanin synthesis may cause problems, such as melasma, solar lentigo, dark spots, and freckles. Considerable effort has been devoted to alleviating these undesired symptoms through the development of safe and effective depigmenting agents. Coumestrol, a plant-derived natural isoflavone with an estrogen-like structure and actions, is […]
851

Measurement of Skin Pigmentation Using a Chromameter in a 3-Dimensional Epidermal Model Containing Functional Melanocytes

Cosmetic or skin care pharmaceutical formulations augment skin pigmentation either for the intended purpose of skin lightening or as an off-target effect.   A convenient way to screen such effects utilizes the MelanoDerm tissue model, a highly differentiated, three-dimensional tissue culture model of human epidermis containing normal human melanocytes and keratinocytes.  Use of this model can […]
850

Standardization of In vitro Macrophotography for Assessment of Cutaneous Responses

The increased popularity of commercially available 3-dimensional human skin equivalents in recent years has allowed for assessment of melanogenesis modulated by compounds topically applied to the skin or directly incorporated from the medium. These skin equivalents provide a suitable model for elucidating the mechanisms of action of various factors that modulate skin pigmentation or other […]
828

Topical Application of Self-delivering RNAi (sd-rxRNA®) Compounds for Reduction of Hyperpigmentation

There are a number of dermal hyperpigmentation disorders that have a potentially negative impact on a person’s psychological well-being. These disorders are caused by an over-production of melanin. The enzyme tyrosinase catalyzes the rate-limiting steps in the production of melanin by melanocytes and inhibition of tyrosinase results in a reduction in pigmentation. We have developed […]
620

THE FIBROBLAST-DERIVED PARACRINE FACTOR NEUREGULIN-1 HAS A NOVEL ROLE IN REGULATING THE CONSTITUTIVE COLOR AND MELANOCYTE FUNCTION IN HUMAN SKIN.

Interactions between melanocytes and neighboring cells in the skin are important in regulating skin color in humans. We recently demonstrated that the less pigmented and thicker skin on the palms and soles is regulated by underlying fibroblasts in those areas, specifically via a secreted factor (DKK1) that modulates Wnt signaling. In this study, we tested […]