pigmentation disorders/tyrosine

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A newly synthesized, potent tyrosinase inhibitor: 5-(6-hydroxy-2-naphthyl)-1,2,3-benzenetriol.

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In searching for new agents with a depigmenting effect, we synthesized a derivative of resveratrol, 5-(6-hydroxy-2-naphthyl)-1,2,3-benzenetriol (5HNB) with a potent tyrosinase inhibitory activity. 5HNB inhibited mushroom tyrosinase with an IC(50) value of 2.95 microM, which is more potent than the

White mutants in mice shedding light on humans.

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In this article we describe the rapid advances made in the molecular genetics of three inherited pigmentation disorders: albinism, piebaldism, and vitiligo, all of which throw light on normal pigment cell function. The focus is on studies in mice, with comparison of data in humans. The critical role

Haematological parameters are normal in dominant white Franches-Montagnes horses carrying a KIT mutation.

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The KIT receptor protein-tyrosine kinase plays an important role during embryonic development. Activation of KIT is crucial for the development of various cell lineages such as melanoblasts, stem cells of the haematopoietic system, spermatogonia and intestinal cells of Cajal. In mice, many mutations

Hair depigmentation is a biological readout for pharmacological inhibition of KIT in mice and humans.

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Deregulated activation of the KIT receptor tyrosine kinase has been implicated in several human cancers and in inflammation, making it an attractive target for therapeutic intervention. Conversely, deficiencies in KIT signaling have been implicated in human and animal hair pigmentation disorders,

Vitiligo and Hashimoto's thyroiditis: Autoimmune diseases linked by clinical presentation, biochemical commonality, and autoimmune/oxidative stress-mediated toxicity pathogenesis.

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Vitiligo (VL) is a chronic autoimmune pigmentation disorder characterized by destruction of melanocytes. The condition is associated with several other autoimmune diseases, but autoimmune thyroid diseases, especially Hashimoto's thyroiditis (HT), is the most prevalent organ-specific autoimmune

KIT as a therapeutic target for non-oncological diseases.

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KIT is a receptor tyrosine kinase that after binding to its ligand stem cell factor activates signaling cascades linked to biological processes such as proliferation, differentiation, migration and cell survival. Based on studies performed on SCF and/or KIT mutant animals that presented anemia,

Inhibition of tyrosinase by protocatechuic aldehyde.

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The purpose of this study was to determine the inhibitory action of protocatechuic aldehyde (PCA) on tyrosinase activity. PCA is one of the compounds found in the root of Salvia miltiorrhiza. Our study documented that PCA has a potent inhibitory effect on tyrosinase, which catalyzes the

Skin-lightening products revisited.

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Skin colour typology depends on the amount and location of its chromophores. Among them, eumelanins derived from 5,6-dihydroxyindole-2-carboxylic acid (DHICA) and 5,6-dihydroxyindole (DHI), and phaeomelanins are of utmost importance. These biomolecules result from the multi-step enzymatic and

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