Journal
BIOORGANIC & MEDICINAL CHEMISTRY
Volume 24, Issue 22, Pages 5685-5692Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2016.08.023
Keywords
Melanogenesis; Tyrosinase; Tyrosinase related protein 1 (TRP-1); Hyperpigmentation; DOPA oxydase activity; DHICA oxydase activity; Spider venoms; Argiotoxine, ArgTX-636
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To discover new molecules with an inhibitory activity of melanogenesis a hundred of scorpions, snakes, spiders and amphibians venoms were screened for their capacity to inhibit mushroom tyrosinase using 3,4-L-dihydroxyphenylalanine (L-DOPA) as substrate. The Argiope lobata spider venom proved to be the most active. HPLC fraction containing Argiotoxine-636 (ArgTX-636), a polyamine known for its numerous biological activities, was found to also show a good regulation activity of melanogenesis by inhibiting DOPA and 5,6-dihydroxyindole-2-carboxylic acid (DHICA) oxidases activities, wore by tyrosinase (TYR) and tyrosinase-related protein 1 (TRP-1), respectively. Our results demonstrate that ArgTX-636 reduced the mushroom tyrosinase activity in a dose dependent way with a maximal half inhibitory concentration (IC50) value of 8.34 mu M, when L-DOPA is used as substrate. The Lineweaver-Burk study showed that ArgTX-636 is a mixed type inhibitor of the diphenolase activity. Moreover, ArgTX-636 inhibits DHICA oxydase activity of mushroom tyrosinase activity with IC50 at 41.3 mu M. ArgTX-636 has no cytotoxicity in B16F10 melanoma cells at concentrations up to 42.1 mu M. The effect of ArgTX-636 on melanogenesis showed that melanin production in B16F10 melanoma cell decreased by approximatively 70% compared to untreated cells. ArgTX-636 displayed no significant effect on the TYR expression while the protein level of TRP-1 decreased in B16F10 cells. Thus, ArgTX-636 could have particular interest for cosmetic and/or pharmaceutical use in order to reduce important dermatoses in black and mixed skins. (C) 2016 Elsevier Ltd. All rights reserved.
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