Random nature of epithelial cancer cell monolayers

Area of Science:

• Cell biology
• Biophysics
• Cancer research

Background:

• Epithelial cells exhibit consistent polygonal shapes and distributions of polygon types (DOPTs) across species.
• This universal paradigm has been observed in normal proliferative epithelia for many years.

Purpose of the Study:

• To investigate how cancer cell hyper-proliferation affects epithelial structure.
• To determine the key parameters controlling DOPT in cancer cell monolayers.
• To compare the structural organization of cancerous and normal epithelial cells.

Main Methods:

• Analysis of non-synchronized and synchronized HeLa cervix cells.
• Development of a theoretical model for morphologically similar random polygonal packings.
• Comparative analysis of tumoural and normal epithelial cell monolayers.

Main Results:

• Hyper-proliferation in cancer cells leads to randomly organized epithelial structures, disrupting the universal DOPT paradigm.
• The spread of cell sizes is identified as a primary factor controlling DOPT in cancer cell monolayers.
• Normal epithelial cells display more ordered structures owing to lower proliferation rates and efficient mechanical stress relaxation.

Conclusions:

• Cancerous epithelia deviate from the universal DOPT due to hyper-proliferation and increased cell size variation.
• Slower proliferation and effective stress relaxation contribute to the ordered structures of normal epithelia.
• The developed theory explains structural features in both normal and some unconventional post-mitotic epithelia.