Volatile biomarkers from human melanoma cells.

Area of Science:

• Biochemistry
• Oncology
• Analytical Chemistry

Background:

• Dogs' olfactory abilities suggest distinct volatile organic compounds (VOCs) in melanoma.
• Previous studies using gas chromatography-mass spectrometry (GC-MS) indicated differences in VOCs but failed to identify specific melanoma-related compounds.
• The origin of previously identified VOCs was often unclear, potentially being exogenous.

Purpose of the Study:

• To identify specific endogenous volatile organic compounds (VOCs) that differentiate melanoma from normal melanocytes.
• To investigate the volatile metabolome of melanoma and normal melanocytes using advanced analytical techniques.
• To assess the potential of VOC monitoring as a melanoma screening methodology.

Main Methods:

• Solid-phase micro-extraction combined with gas chromatography-mass spectrometry (GC-MS) for VOC analysis.
• Utilized single-stranded DNA-coated nanotube (DNACNT) sensors for metabolome analysis.
• Focused on identifying VOCs of endogenous origin differentiating cancer from normal cells.

Main Results:

• Identified specific VOC differences, including higher isoamyl alcohol and lower isovaleric acid in melanoma cells compared to normal melanocytes.
• Detected dimethyldi- and trisulfide in melanoma cells, which were absent in normal melanocytes.
• Demonstrated clear distinctions in the total volatile metabolome between melanoma and normal melanocytes via DNACNT sensors and GC-MS.

Conclusions:

• Specific volatile organic compounds (VOCs) are characteristic of melanoma cells.
• The identified VOCs, originating from endogenous metabolic pathways, can serve as biomarkers for melanoma.
• Monitoring melanoma VOCs presents a promising, non-invasive screening approach.