Mechanism of oxyresveratrol

Unique Skin Lightening/Brightening Mechanism of Oxyresveratrol

Oxyresveratrol provides unmatched skin brightening because it is an exceptionally potent natural ingredient that halts melanin production by tyrosinase inhibition at the source. Additionally,

oxyresveratrol down‑regulates the genetic signaling and stops hyperpigmentation by disrupting the intercellular transport of melanosomes from melanocytes to surrounding keratinocytes.
Skin pigmentation results from two primary mechanisms: (1) melanin synthesis within melanocytes; and (2) the transfer of melanin from melanocytes to keratinocytes.

(1a)Melanin synthesis is primarily catalyzed by tyrosinase (TYR) and tyrosinase-related proteins (TRP-1 and TRP-2)

(2a)Melanocytes contain a high density of melanosomes, and the dendrites of each melanocyte connect to an average of approximately 36 keratinocytes, forming structures known as epidermal-melanin units.

Melanin reduction by Tyrosinase inhibition

Oxyresveratrol is a potent inhibitor of human tyrosinase, with an IC50 value of 2.27 µg/mL. Treatment of B16F10 melanoma cells with oxyresveratrol suppressed melanogenesis through the down-regulation of the MC1R/cAMP/MITF signaling pathway

Oxyresveratrol treatment resulted in a significant decrease in melanin production, with reductions up to 39.0% (P = 0.001), at concentrations of 10 µg/mL, compared to the control . The result indicate that oxyresveratrol effectively suppressed melanin production in B16F10 cells.

Melanin reduction by preventing transfer of Melanin

Treatment with 10 µg/mL oxyresveratrol resulted in significant reductions in melanin content both within B16F10 cells and in the transferred melanin to HaCaT cells, with decreases of 72.0% to 85.9% (P = 0.010).

These findings suggest that oxyresveratrol inhibited the transfer of melanin from B16F10 cells to HaCaT cells.

The dendrite serves as a crucial pathway for the transfer of melanosomes from melanocytes to keratinocytes, with its number and length significantly influencing the efficiency of this transfer.

Microscopic analysis after treatment of oxyresveratrol , further revealed that

oxyresveratrol reduced the proportion of dendritic melanocytes by 60.8% (P = 0.001) and the average length of their dendrites by 23.2% (P = 0.111) compared to the control group These results suggested that oxyresveratrol disturbed melanocyte dendrite formation.

Oxyresveratrol was found to significantly reduce both the number and length of melanocyte dendrites, thereby decreasing melanin transfer from B16F10 cells to HaCaT cells.

These findings highlight the inhibitory effect of oxyresveratrol on both melanin synthesis and transfer, proposing potential treatment for melanoma and hyperpigmentation.