Transformed and Tumor Cells Spontaneously Produce DNA-Containing Extracellular Structures In Vitro

Area of Science:

• Cell Biology
• Extracellular Matrix Research

Background:

• Extracellular DNA (eDNA) plays roles in various biological processes.
• The formation mechanisms of eDNA structures by non-immune cells are not fully understood.

Purpose of the Study:

• To investigate the formation of DNA-containing extracellular structures by immortalized fibroblasts and HCT116 adenocarcinoma cells.
• To characterize the temporal dynamics and morphology of these structures.

Main Methods:

• Utilized fluorescence microscopy with SYBR Green dye for DNA visualization.
• Cultured immortalized fibroblasts and HCT116 adenocarcinoma cells.
• Observed cells fixed to a substrate over a 3-hour incubation period.

Main Results:

• Both cell types spontaneously formed DNA-containing extracellular structures.
• Structure formation initiated within 1 hour post-fixation with single DNA strand release.
• Completed formation into parallel fiber bundles by 3 hours.
• Intact neutrophils did not exhibit similar spontaneous structure formation.

Conclusions:

• Immortalized fibroblasts and HCT116 adenocarcinoma cells actively secrete DNA-containing extracellular structures.
• The process involves a time-dependent formation of fibrous bundles.
• Suggests a novel mechanism of extracellular DNA release by cancer and fibroblast cells.