Mechanical Way To Study Molecular Structure of Pericellular Layer

Area of Science:

• Biophysics
• Cell Biology
• Cancer Research

Background:

• Atomic force microscopy (AFM) is used to study cell mechanical properties.
• Cancer cells often exhibit altered mechanical properties compared to nonmalignant cells.
• The pericellular layer significantly influences measured cell rigidity but is often overlooked.

Purpose of the Study:

• To investigate the mechanical properties of bladder cancer cells (TCCSUP) and nonmalignant cells (HCV29) using AFM.
• To incorporate the pericellular layer into AFM analysis using a brush model.
• To determine the physical and biochemical properties of the pericellular layer in malignant and nonmalignant cells.

Main Methods:

• Utilized atomic force microscopy (AFM) with a brush model for cell indentation studies.
• Analyzed bladder epithelial nonmalignant (HCV29) and cancerous (TCCSUP) cells.
• Applied enzymatic treatments (heparinase I, neuraminidase) to probe pericellular layer composition.

Main Results:

• Cancer cells exhibited a longer inner pericellular brush but similar grafting density compared to nonmalignant cells.
• The outer pericellular brush was shorter and less dense in cancer cells.
• A method was developed to translate physical properties of the pericellular layer into biochemical terms.

Conclusions:

• The pericellular layer's physical properties differ between malignant and nonmalignant bladder cells.
• AFM analysis, considering the pericellular layer, offers a more comprehensive understanding of cell mechanics.
• The developed approach facilitates deciphering the molecular composition of cellular layers.