p300 KAT Regulates SOX10 Stability and Function in Human Melanoma

Area of Science:

• Oncology
• Molecular Biology
• Cancer Genetics

Background:

• SOX10 is crucial for melanoma growth but its loss promotes invasion and therapy resistance.
• Targeting SOX10 for proliferation inhibition risks increasing melanoma cell invasion.
• Co-amplification of EP300 and SOX10 genes occurs in various melanoma types.

Purpose of the Study:

• To investigate the SOX10/p300 interaction in melanoma.
• To evaluate the therapeutic potential of p300 inhibition in melanoma.

Main Methods:

• Analysis of EP300 and SOX10 gene co-amplification in melanoma samples.
• Assessing the effect of p300 inhibitor A-485 on SOX10 protein stability and degradation.
• Evaluating A-485's impact on melanoma cell proliferation and invasion in vitro.

Main Results:

• p300 lysine acetyltransferase (KAT) activity stabilizes SOX10 protein.
• A-485 treatment downregulates SOX10 via proteasomal degradation.
• A-485 inhibits proliferation of SOX10+ melanoma cells and reduces invasion in AXLhigh/MITFlow cells.

Conclusions:

• The SOX10/p300 axis is vital for melanoma growth and invasion.
• Inhibiting p300 KAT activity with A-485 is a promising therapeutic strategy for SOX10-dependent melanomas.