Malignant melanoma and its stromal nonimmune microecosystem

Area of Science:

• Dermatology
• Oncology
• Cell Biology

Background:

• Cutaneous malignant melanoma (CMM) progression is influenced by biological signals.
• The dermal extracellular matrix (ECM) plays a critical role in CMM cell behavior.
• Stromal cells within the ECM release components affecting tumor growth.

Purpose of the Study:

• To summarize peculiar aspects of the peri-CMM stroma.
• To investigate the relationship between ECM components and CMM cell characteristics.
• To explore the role of the CMM-stroma interaction in melanoma metastasis.

Main Methods:

• Analysis of peri-CMM stroma for specific markers (Factor XIIIa, CD34, versican, α (IV) collagen chains).
• Correlation of stromal changes with neoangiogenesis and extravascular metastatic spread.
• Investigation of potential CMM stem cells or cells with aberrant HOX gene expression.

Main Results:

• Specific changes in the peri-CMM stroma were identified, including intracytoplasmic loads of Factor XIIIa, CD34, versican, and α (IV) collagen chains.
• These stromal alterations were localized to areas of neoangiogenesis and unicellular metastatic spread.
• The presence of these migratory CMM cells is linked to an increased risk of regional lymph node metastases.

Conclusions:

• The connection between CMM cells and the surrounding stroma is vital for regulating tumor growth, invasiveness, and initial metastatic spread.
• The peri-CMM stroma actively participates in the early, inconspicuous metastatic migration of CMM cells.
• Further research is needed to fully elucidate the complex CMM-stroma interactions in melanoma pathogenesis.