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Published on: September 7, 2013
A small molecule inhibitor of Mitf-E-box DNA binding and its depigmenting effect in melan-a cells
1Department of Biological Engineering, National Lab of Skin-bioactive Material, Inha University Department of Dermatology, College of Medicine, Inha University, Incheon, Korea.
Background:
Microphthalmia associated transcription factor (Mitf) is a key regulatory transcriptional factor of pigmentation-related genes including tyrosinase. Inhibition of tyrosinase transcription by blocking the binding of Mitf with its promoter E-box DNA can control the pigmentation. However, no such chemicals were reported so far.
Objective:
To discover and evaluate the small molecule inhibitors of Mitf-E-box DNA.
Methods:
Candidate chemicals were screened by virtual screening from pharmacophore data followed by Mitf E-box DNA protein chip. After selecting the chemical, its inhibitory activity on binding interaction between Mitf and E-box DNA, electrophoretic mobility shift assay (EMSA) was performed. To evaluate the depigmenting activity of Compound #17, cellular melanin assa, and Western blot were performed in melan-a cells.
Results:
Among 27 chemicals selected from a pharmacophore data by virtual screening, Compound #17 was screened, which showed the most potent inhibitory activity against Mitf-E-box DNA binding in protein chip. EMSA results confirmed the specific inhibition of Compound #17 on Mitf-E-box DNA binding. In melan-a cells, Compound #17 reduced tyrosinase expression and melanin synthesis (62.5% at 25 μM).
Conclusions:
The results show that Compound #17 is the first small molecule inhibitor of Mitf-E-box DNA binding with depigmenting activity.
Insights
Researchers discovered Compound #17, the first small molecule inhibitor targeting Microphthalmia-associated transcription factor (Mitf) DNA binding. This compound effectively reduces melanin synthesis, offering a new approach for pigmentation control.
Area of Science:
- Biochemistry
- Molecular Biology
- Dermatology
Background:
- Microphthalmia-associated transcription factor (Mitf) regulates pigmentation genes like tyrosinase.
- Inhibiting Mitf's binding to its E-box DNA promoter can control pigmentation.
- No prior small molecule inhibitors for this interaction were identified.
Purpose of the Study:
- To discover and evaluate small molecule inhibitors of the Mitf-E-box DNA interaction.
- To identify compounds that can block Mitf binding to its target DNA sequence.
Main Methods:
- Virtual screening of pharmacophore data followed by protein chip assays.
- Electrophoretic mobility shift assay (EMSA) to confirm binding inhibition.
- Cellular melanin assays and Western blot in melan-a cells to assess depigmenting activity.
Main Results:
- Compound #17 demonstrated potent inhibition of Mitf-E-box DNA binding in vitro.
- EMSA confirmed Compound #17's specific inhibitory effect.
- In melan-a cells, Compound #17 significantly reduced tyrosinase expression and melanin synthesis (62.5% at 25 μM).
Conclusions:
- Compound #17 is identified as the first small molecule inhibitor of Mitf-E-box DNA binding.
- This compound exhibits significant depigmenting activity.
- Represents a novel therapeutic strategy for controlling pigmentation.
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