Targeted Therapy-Resistant Melanoma Cells Acquire Transcriptomic Similarities with Human Melanoblasts

Area of Science:

• Oncology
• Stem Cell Biology
• Molecular Biology

Background:

• Mechanisms of adaptive and acquired drug resistance in tumors, particularly melanoma, remain incompletely understood.
• Known resistance mechanisms involve gene amplifications or mutations reactivating MAPK or PI3K pathways.
• Novel models are needed to elucidate complex resistance profiles.

Purpose of the Study:

• To generate and characterize human melanoblast models from induced pluripotent stem cells (iPSCs) and dedifferentiated melanocytes.
• To compare melanoblast transcriptomes with those of MAPK inhibitor-resistant melanoma cells.
• To identify gene expression differences associated with drug sensitivity and resistance.

Main Methods:

• Generation of human melanoblasts via differentiation of iPSCs and dedifferentiation of melanocytes.
• Transcriptome analysis of generated melanoblasts and drug-sensitive/resistant melanoma cells.
• Comparative analysis to identify differentially expressed genes.

Main Results:

• Gene expression alterations in cell cycle control, DNA damage control, metabolism, and cancer pathways were observed in melanoblasts and resistant melanoma samples.
• Genes related to antigen presentation and cellular movement were uniquely regulated in melanoblast populations and acquired resistant melanoma.
• Distinct expression patterns of transcription factors and CDK5 pathway genes were noted between melanocyte-derived melanoblasts and adaptive resistant melanoma.

Conclusions:

• In vitro human melanoblast models are valuable tools for understanding drug-resistant melanoma.
• These models help elucidate gene expression profiles underlying adaptive and acquired resistance.
• The study highlights specific molecular pathways and gene sets involved in melanoma drug resistance.