Investigating Fibroblast-Induced Collagen Gel Contraction Using a Dynamic Microscale Platform

Area of Science:

• Mechanobiology
• Biomaterials Engineering
• Cellular Mechanotransduction

Background:

• Cell-induced collagen gel contraction (CGC) is crucial for understanding tissue remodeling in inflammation and wound healing.
• Traditional CGC assays require large volumes of cell-laden collagen and are labor-intensive.
• Studying cell-ECM interactions is vital for disease research, including fibrosis.

Purpose of the Study:

• To develop a novel, microscale CGC assay for efficient mechanobiology research.
• To enable the study of cell-ECM dynamics with reduced sample volume.
• To investigate intercellular crosstalk in fibrotic disease models.

Main Methods:

• Engineered a microscale well plate insert utilizing surface tension for manipulating small volumes (14 μL) of cell-laden collagen.
• Developed a simplified, dynamic assay system operated with minimal pipetting steps.
• Quantified gel contraction using a straightforward one-dimensional measurement.

Main Results:

• Demonstrated significantly greater gel contraction in human lung fibroblasts cultured in serum-containing media compared to serum-free media (p ≤ 0.05).
• Observed that soluble factors from eosinophils significantly enhance fibroblast-mediated gel contraction in coculture models (p ≤ 0.01).
• The microscale CGC device uses 7- to 35-fold less cell-laden gel than conventional methods.

Conclusions:

• The microscale CGC assay is a sensitive and efficient tool for studying cell contractility and ECM remodeling.
• This method facilitates the investigation of intercellular communication in fibrotic processes, such as asthma.
• The device offers a valuable platform for mechanobiology research with reduced resource requirements.