Micro-strains in the extracellular matrix induce angiogenesis.

Area of Science:

• Biomedical Engineering
• Cancer Biology
• Microfluidics

Background:

• Translating in vitro cancer models to clinical success is challenging due to limited understanding of biomechanical factors.
• Traditional platforms struggle to independently manipulate biomechanical properties in a controlled tumor microenvironment.

Purpose of the Study:

• To develop a novel microfluidic platform for studying biomechanical control of tumor angiogenesis.
• To investigate the role of mechanical strain and interstitial flow in the tumor microenvironment.

Main Methods:

• A microfluidic platform was designed to mimic the vascularized tumor microenvironment.
• Independent control of interstitial flow and mechanical strain was achieved.
• Mechanically-stimulated angiogenesis was isolated by manipulating interstitial flow to exclude soluble factors.

Main Results:

• Enhanced mechanical strain, particularly from cancer-associated fibroblasts (CAFs), significantly promoted angiogenesis in microvasculature models.
• This mechanical stimulation occurred even when diffusion of soluble factors was prevented.
• Inhibiting CAFs and reducing micro-strains led to a significant decrease in angiogenesis.

Conclusions:

• Biomechanical signals, specifically mechanical strain, play a crucial role in tumor angiogenesis, independent of soluble biochemical factors.
• The novel microfluidic platform allows for the investigation of biomechanical influences on cellular activity, with potential applications beyond cancer research.