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UCHL1 Regulates Melanogenesis through Controlling MITF Stability in Human Melanocytes
Eun Young Seo1, Seon-Pil Jin2, Kyung-Cheol Sohn3
1Department of Dermatology, Seoul National University College of Medicine, Seoul, Republic of Korea; Institute of Human-Environmental Interface Biology, Medical Research Center, Seoul National University, Seoul, Republic of Korea.
The Journal of Investigative Dermatology
|April 11, 2017
Summary
Ubiquitin carboxyl-terminal hydrolase L1 (UCHL1) regulates skin pigmentation by degrading microphthalmia-associated transcription factor (MITF). This finding offers potential therapeutic targets for skin pigmentation disorders.
Area of Science:
- Biochemistry
- Dermatology
- Molecular Biology
Background:
- Ubiquitin carboxyl-terminal hydrolase L1 (UCHL1) is involved in cellular signaling via the ubiquitin-proteasome system.
- UCHL1 is present in human skin and acts as a neuronal marker, but its role in melanogenesis is unclear.
Purpose of the Study:
- To investigate the function of UCHL1 in melanogenesis.
- To elucidate the molecular mechanisms underlying UCHL1's role in skin pigmentation.
Main Methods:
- Small interfering RNA (siRNA) was used to downregulate UCHL1 expression in human melanocytes.
- Adenovirus transfection was employed for UCHL1 and microphthalmia-associated transcription factor (MITF) overexpression.
- Proteasome inhibitor MG132 and de novo protein synthesis inhibition were used to assess MITF stability.
Main Results:
- UCHL1 downregulation increased MITF, tyrosinase, and melanin production.
- UCHL1 overexpression decreased MITF protein levels and melanin synthesis.
- UCHL1 was found to destabilize MITF through binding to ubiquitinated MITF, independent of mRNA levels.
Conclusions:
- UCHL1 negatively regulates melanogenesis by promoting MITF protein degradation.
- Targeting UCHL1-mediated MITF suppression could offer new therapeutic strategies for melanoma and dyspigmentation disorders.