Immunomagnetic-Enriched Subpopulations of Melanoma Circulating Tumour Cells (CTCs) Exhibit Distinct Transcriptome...

Area of Science:

• Oncology
• Molecular Biology
• Genomics

Background:

• Cutaneous melanoma circulating tumor cells (CTCs) are known for their phenotypic and molecular heterogeneity.
• Understanding CTC subpopulations is crucial for deciphering melanoma progression and treatment resistance.

Purpose of the Study:

• To profile and compare the gene expression of distinct melanoma CTC subpopulations.
• To identify molecular differences between MCSP-enriched and ABCB5-enriched CTCs.

Main Methods:

• Immunomagnetic capture of CTCs targeting MCSP or ABCB5 markers.
• RT-PCR analysis of melanoma gene expression in enriched CTC fractions.
• Genome-wide gene expression microarray analysis of selected CTC fractions.

Main Results:

• Both MCSP- and ABCB5-enriched CTCs displayed transcriptional programs related to cell survival, proliferation, and migration.
• ABCB5-enriched CTCs showed significant upregulation of genes associated with epithelial to mesenchymal transition (EMT).
• Distinct transcriptional profiles were identified for the two studied melanoma CTC subpopulations.

Conclusions:

• Melanoma patients harbor at least two distinct CTC subpopulations with unique molecular signatures.
• The identified transcriptional differences, particularly EMT markers in ABCB5-CTCs, suggest distinct roles in melanoma invasiveness and metastasis.
• These findings highlight the complexity of melanoma CTCs and their potential implications for disease progression and therapeutic strategies.