Variable Tumor Microenvironment-on-a-chip with Temporal Angiogenic Switching System by Diffusion Control^.

Area of Science:

• Biomedical Engineering
• Cancer Research
• Microfluidics

Background:

• Preclinical trials are costly and time-consuming, necessitating advanced in vitro models.
• Accurate tumor-microenvironment (TME) representation is crucial for in vitro cancer models.
• Angiogenesis, a key TME feature, drives tumor growth and metastasis.

Purpose of the Study:

• To develop a temporally-controlled TME-on-a-chip for studying angiogenesis.
• To overcome limitations of conventional microfluidic devices in manipulating cellular interactions and signaling.
• To create a variable TME-on-a-chip with diffusion switch channels for precise temporal control.

Main Methods:

• Fabrication of a hydrogel-based microfluidic device with diffusion switch channels.
• Demonstration of temporal diffusion control using a fluorescent dye.
• Assessment of endothelial cell (HUVEC) migration in response to vascular endothelial growth factor (VEGF) gradients.

Main Results:

• Successful temporal diffusion control was achieved by regulating inflow through diffusion switch channels.
• The TME-on-a-chip model effectively reproduced angiogenesis triggering via temporal diffusion control of VEGF.
• The device design allows for straightforward modification to model more complex TME scenarios.

Conclusions:

• The proposed hydrogel-based TME-on-a-chip enables precise temporal control over microenvironmental conditions.
• This technology accurately models angiogenesis, a critical aspect of tumor biology.
• The adaptable design facilitates the development of sophisticated in vitro models for cancer research and drug discovery.