Cysteamine Cream : Presentation
Skin whitening agents used for the treatment of skin hyperpigmenting disorders (such as melasma (pregnancy mask) and lentigo) but also in skin whitening of normal skin belong to a few family groups of chemicals.
The most important of these groups are the phenols, catechols and thiols:
- Examples of phenolic and catecholic skin whiteners are hydroquinone and 4-isopropyl catechol; those substances act prinicpally as melanocytotoxic molecules (melanocyte killing for example). The cytotoxic effect of phenols and catechols has caused them to be banned as cosmetic ingredients.
- On the contrary thiols (molecules containing an SH- group) usually exert their depigmenting effect through the inhibition of melanin synthesis. Thiols can act:
- as inhibitors of several enzymes involved in melanin synthesis (peroxidase and tyrosinase)
- as quenchers of melanin intermediates such as dopaquinone.
- as metal ion chelators thus enabling removal of iron and copper ions involved in melanin synthesis. This blocks the synthesis of melanin through the inhibition of Fenton-like reactions.
- Examples of thiolic depigmenting agents are methimazole and mercaptoethylamines such as Cysteamine Hydrochloride.
More simply, how does it work ?
- Contrary to other skin depigmenting agents which are only inhibitors of the enzyme tyrosinase, cysteamine is an inhibitor of both tyrosinase and peroxidase in melanocytes (pigment cells).
- Tyrosinase is responsible for mediating the first steps in melanin (skin pigment) synthesis and peroxidase mediates the last steps in this pathway.
- By inhibiting both enzymes, cysteamine inhibits the melanin synthesis pathway in several steps.
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Category : bleaching agent - Modifie le 11.9.2012Category : crème blanchissante - Modifie le 11.9.2012Category : crème cysteamine - Modifie le 11.9.2012Category : crème dépigmentante - Modifie le 11.9.2012Category : Cysteamine cream - Modifie le 11.9.2012Category : depigmenting cream - Modifie le 11.9.2012Category : whitening cream - Modifie le 11.9.2012