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Updated: Apr 30, 2026

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Published on: March 1, 2022
Nrf2 negatively regulates melanogenesis by modulating PI3K/Akt signaling
Jung-Min Shin1, Mi Yoon Kim1, Kyung-Cheol Sohn1
1Department of Dermatology and Research Institute for Medical Sciences, School of Medicine, Chungnam National University, Daejeon, Korea.
Nuclear factor erythroid 2-related factor 2 (Nrf2) inhibits melanogenesis, the process of melanin production. Nrf2 activation decreases melanin synthesis and key enzyme expression in human melanocytes via the PI3K/Akt pathway.
Area of Science:
- Cell Biology
- Biochemistry
- Dermatology
Background:
- Nuclear factor erythroid 2-related factor 2 (Nrf2) is a transcription factor crucial for cellular defense against oxidative stress and xenobiotics.
- Nrf2 regulates the expression of numerous cytoprotective genes.
- The role of Nrf2 in melanogenesis, the process of melanin pigment production, is not well understood.
Purpose of the Study:
- To investigate the effect of Nrf2 on melanogenesis in normal human melanocytes (NHMCs).
- To elucidate the molecular mechanisms underlying Nrf2's influence on melanin synthesis.
Main Methods:
- Normal human melanocytes (NHMCs) were transduced with a recombinant adenovirus expressing Nrf2.
- Expression levels of melanogenesis-related genes (tyrosinase, tyrosinase-related protein 1) were analyzed.
- The role of Keap1, an Nrf2 regulator, was assessed.
- PI3K/Akt signaling pathway activation was investigated using wortmannin, a PI3K inhibitor.
Main Results:
- Overexpression of Nrf2 in NHMCs led to a significant decrease in melanin synthesis.
- Nrf2 overexpression reduced the expression of tyrosinase and tyrosinase-related protein 1.
- The inhibitory effect of Nrf2 on melanogenesis was reversed by Keap1 overexpression.
- Nrf2 overexpression activated the PI3K/Akt signaling pathway.
- Inhibition of PI3K activity with wortmannin reversed the depigmentary effects of Nrf2.
Conclusions:
- Nrf2 negatively regulates melanogenesis in normal human melanocytes.
- Nrf2 exerts its depigmentary effects by modulating the PI3K/Akt signaling pathway.
- These findings identify Nrf2 as a potential target for modulating skin pigmentation.
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