Tumor microenvironment modulates hyaluronan expression: the lactate effect

Area of Science:

• Oncology
• Biochemistry
• Cell Biology

Background:

• Hyaluronan (HA) synthesis is regulated by the microenvironment, influencing melanoma cell growth and metastasis.
• High HA-producing melanoma cells show increased tumor growth and metastatic potential.
• Previous studies primarily examined HA expression in vitro, necessitating in vivo investigation.

Purpose of the Study:

• To compare hyaluronan expression patterns in B16-F1 and B16-F10 melanoma cells in vitro and in situ.
• To investigate the role of the tumor microenvironment, specifically lactate, in regulating HA synthesis in melanoma cells.

Main Methods:

• Assessed cell surface HA expression using the HA-binding peptide Pep-1.
• Compared HA expression in B16-F1 and B16-F10 cells both in vitro and in situ using cryostat sections.
• Investigated the effect of lactate stimulation on HA expression in both cell lines.

Main Results:

• B16-F1 melanoma cells exhibited significantly higher Pep-1 binding (indicating higher HA levels) in vitro compared to B16-F10 cells.
• In situ, HA expression levels were comparable between B16-F1 and B16-F10 cells within skin tumors.
• Lactate stimulation induced high HA concentrations in B16-F10 cells but not in B16-F1 cells.

Conclusions:

• B16-F1 cells show high HA expression both in vitro and in vivo.
• B16-F10 cells express high HA concentrations primarily within the tumor microenvironment, particularly after lactate stimulation.
• Tumor microenvironment components like lactate can induce HA expression in melanoma cells, potentially promoting an aggressive phenotype.