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Hedi Raizer

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Common misconceptions about melanogenesis

Melanogenesis is the biosynthetic pathway that produces melanin pigments in melanocytes. This page addresses common misconceptions about the pathway and its molecular targets, drawing on in silico, cell-culture, animal-m

peptides-pro Editorial

Melanogenesis is the biosynthetic pathway by which melanocytes produce melanin pigments. It is not a single enzyme, a single gene, or a single cosmetic target, and it is not equivalent to skin colour, to tanning, or to any one pigmentation disorder. The pathway is regulated by a set of molecular targets that includes tyrosinase, microphthalmia-associated transcription factor (MITF), and the melanocortin receptors, alongside antioxidant enzymes and other regulators of gene expression and DNA repair [1].

Tyrosinase catalyses the rate-limiting step in melanogenesis, which is why it is the most frequently studied target in this field [2]. A recurring misconception is that inhibition of mushroom tyrosinase predicts inhibition of the human enzyme; the two are not interchangeable, and many mushroom-derived inhibitors show limited efficacy against human tyrosinase [2].

Research Studies

Aminonaphthoquinone-chalcone hybrids and human tyrosinase in silico

Ten aminonaphthoquinone-chalcone hybrids were evaluated against human tyrosinase using in silico methods. Molecular docking indicated that all ten showed higher binding affinity than kojic acid, and six of them (compounds 3, 4, 5, 7, 9 and 10) showed higher binding affinity than the remainder and interacted with amino acid residues within the tyrosinase active site [2]. These are computational predictions, not measurements of enzyme activity in cells or in tissue.

N-(2-mercaptoethyl)benzamide derivatives and tyrosinase in enzymatic and B16F10 assays

N-(2-mercaptoethyl)benzamide (NMEB) derivatives 1a-1m were designed as Cu(II) chelators and assessed for tyrosinase inhibition. Derivative 1m inhibited mushroom tyrosinase activity twice as potently as kojic acid in the presence of l-DOPA, and kinetic studies characterised the inhibition mechanism for three derivatives including 1m. All NMEB derivatives suppressed melanogenesis more potently than kojic acid in B16F10 cells, reducing melanin production in a concentration-dependent manner [3]. B16F10 is a murine melanoma cell line, so these findings are cell-culture findings, not human findings.

4-(4-fluorobenzyl)piperazine-acetanilide conjugates and tyrosinase in vitro

A series of 4-(4-fluorobenzyl)piperazine derivatives (2a-u) was designed, synthesised and evaluated as tyrosinase inhibitors. In in vitro enzymatic assays using l-DOPA as substrate, several derivatives showed higher inhibitory activity than kojic acid under identical experimental conditions [5].

Cannabidiol-thiosemicarbazone and tyrosinase in human skin-derived cells

CBD-TSC1, a cannabidiol-based thiosemicarbazone derivative, was investigated as a modulator of melanogenesis in human skin-derived cells, in a context where existing tyrosinase inhibitors are often limited by low potency, instability or cytotoxicity [8].

Coreopsis tinctoria and multi-target enzyme inhibition

Coreopsis tinctoria Nutt. (Kunlun snow chrysanthemum) is a traditional medicinal and edible plant of the high-altitude regions of Xinjiang, China, whose dried flower heads have traditional uses. A ligand-fishing approach was used to identify multi-target enzyme inhibitors from the plant in an ethnopharmacology-guided study [7].

1064-nm Q-switched fractional laser combined with oral tranexamic acid in melasma

Melasma is a common acquired condition of symmetric hyperpigmentation, typically occurring on the face, with higher prevalence in females and darker skin types; treatments include topical, oral, procedural and combination approaches. The 1064-nm Q-switched laser is among the most widely used lasers for pigmented disease, and its wavelength is effectively absorbed by pigment, leading to damage of pigment and melanocyte. A clinical observation study examined the 1064-nm Q-switched fractional laser combined with oral tranexamic acid in the treatment of melasma [4].

Microneedle-based microenvironment remodelling in refractory melasma

Clinically refractory melasma remains difficult to treat because it is driven by a multidimensional pathological microenvironment that includes melanocyte hyperactivity, aberrant vascular growth, oxidative stress and chronic inflammation, so single-pathway therapies often produce incomplete or transient responses. A bionic intelligent responsive barbed microneedle system was developed to synergistically remodel that microenvironment [6].

Molecular targets in cosmetic science

A review of molecular targets in modern cosmetic research identified telomerase, histone deacetylases (particularly sirtuins), matrix metalloproteinases, antioxidant enzymes, the CD44 receptor, tyrosinase, MITF and the melanocortin receptors as targets regulating processes such as DNA repair, gene expression and extracellular matrix turnover [1]. This places tyrosinase within a broader regulatory network rather than treating it as the sole determinant of pigmentation.

Model systemWhat it can showWhat it cannot show
In silico dockingPredicted binding affinity to a target [2]Enzyme inhibition or melanin output in cells
Purified enzyme assayInhibition of mushroom tyrosinase activity [3][5]Activity against human tyrosinase [2]
B16F10 murine melanoma cellsConcentration-dependent reduction in melanin production [3]Effects in human skin or in vivo
Human skin-derived cellsActivity in a human cell context [8]Clinical outcomes
Clinical observationOutcomes of a defined treatment protocol in a patient population [4]Mechanism of action

If you are reading this for personal health reasons

The materials described here are supplied for laboratory research use only, and we do not provide dosing information or medical guidance of any kind. Nothing on this page is a recommendation to use any compound. Anyone considering a compound for themselves should speak to a licensed clinician.

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