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FK506 regulates pigmentation by maturing the melanosome and facilitating their transfer to keratinocytes
- FK506 regulates pigmentation by maturing the melanosome and facilitating their transfer to keratinocytes
- Jung H.; Chung H.; Chang S.E.; Kang D.-H.; Oh E.-S.
- Ewha Authors
- 강덕희; 오억수
- SCOPUS Author ID
- 강덕희; 오억수
- Issue Date
- Journal Title
- Pigment Cell and Melanoma Research
- vol. 29, no. 2, pp. 199 - 209
- FK506; Melano-some; Melanogenesis; Tyrosinase; Vitiligo
- Blackwell Publishing Ltd
- SCI; SCIE; SCOPUS
- Despite the clinical ability of topical tacrolimus (FK506) to effectively promote repigmentation in vitiligo, the underlying mechanism through which FK506 regulates melanogenesis was previously unclear. We found that FK506 treatment increased the melanin contents (especially that of eumelanin) in both melanocytes and melanoma cells. This treatment did not affect the transcription levels of tyrosinase, suggesting that FK506 increases melanin synthesis by regulating cellular levels of tyrosinase. Interestingly, FK506 promoted melanosome maturation by increasing melanosomal pH (a marker of melanosome maturation), thereby enhancing the stability of melanosome-localized tyrosinase. In addition, FK506 enhanced UVB-mediated melanosome secretion, the uptake of melanosomes by HaCaT cells, and the transfer of melanosomes to keratinocytes co-cultured with melanocytes. Together, these findings suggest that FK506 contributes to melanin synthesis by regulating the maturation of melanosomes and their transfer to keratinocytes. This offers a novel regulatory mechanism through which FK506 and UVB can have a combined effect on melanogenesis. © 2016 John Wiley & Sons A/S.
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