Opportunity
Cancer metastasis remains a leading cause of cancer-related deaths globally, with cell migration being a critical step in this complex process. During metastasis, cancer cells navigate through restrictive microenvironments characterized by confined spaces such as micropores, microchannels within extracellular matrix, and around blood vessels. This confined migration is influenced by various mechanical forces and stromal interactions. Currently, there is a significant lack of effective in vitro platforms that accurately simulate these confined migration conditions to study cancer cell behavior. Existing models fail to replicate the mechanical constraints and spatial limitations that cells encounter during metastasis, making it difficult to investigate the underlying mechanisms or screen for potential therapeutic agents that could inhibit this migration. Consequently, the development of drugs or cellular therapies targeting metastasis is hindered by the absence of a reliable, high-throughput screening tool that mimics the physiological confined migration environment, creating an urgent need for innovative devices to bridge this gap in cancer research and drug discovery.
Technology
The present invention addresses this need by providing a confined migration microfluidic device designed to simulate the restrictive microenvironment for cell migration and enable high-throughput drug screening. The core innovation lies in a microfluidic chip architecture featuring parallel first and second channels connected by multiple identical confined migration channels. These confined channels have a significantly smaller depth (e.g., 4-10 microns) compared to the main channels (e.g., 20-40 microns), creating a physical constriction that mimics in vivo confined spaces. Extension channels with greater depth connect the main channels to the confined channels, ensuring cells properly enter the migration zone. A key feature is the integration of a pyramid-like flow diverging structure connected to the inlets of the first channels. This gradient flow structure ensures uniform distribution of cells or drugs into all parallel first channels, guaranteeing consistent experimental conditions across multiple tests on a single chip. The device is typically fabricated from polydimethylsiloxane (PDMS) using soft lithography and can be configured with an upper and lower chip assembly to form the channel network. Surface treatment with cell adhesion agents like fibronectin enhances cell attachment. Furthermore, the design supports the accommodation of multiple chips within a single holder for parallel, high-throughput analysis. This integrated system allows for the co-culture of target cells (e.g., cancer cells) in one set of channels while introducing drug candidates or other cell types (e.g., fibroblasts, immune cells) into the parallel channels, enabling real-time observation of migration interference effects through the confined channels.
Advantages
- Enables precise simulation of the confined spatial conditions cancer cells encounter during metastasis, providing a more physiologically relevant model.
- Facilitates high-throughput screening by integrating multiple parallel test channels and an accommodation structure for multiple chips on a single platform.
- The pyramid-like flow diverging structure ensures consistent concentration and volume of introduced agents across all test channels, minimizing experimental error.
- Allows for versatile assay configurations: studying effects of different drugs, different drug concentrations, various cell types, and co-culture interactions on cell migration.
- Simplifies operational procedures by enabling multiple tests and controls to be performed simultaneously on one microfluidic chip.
- Supports real-time, live-cell imaging and monitoring of cell migration dynamics over extended periods (e.g., 48 hours).
- The device is reusable, cost-effective to manufacture using standard soft lithography, and compatible with common microscopy systems.
Applications
- Screening for drug candidates that inhibit the confined migration of cancer cells, a key step in metastasis.
- Evaluating the efficacy of different drug concentrations on inhibiting cell migration.
- Studying the effects of specific cell types (e.g., tumor-associated fibroblasts, immune cells) on cancer cell migration through co-culture models.
- Investigating the migratory behavior of various cancer cell types (e.g., breast, lung, colorectal) under confined conditions.
- Fundamental research into the mechanisms of cancer cell migration and metastasis in a controlled microenvironment.
- Potential use in personalized medicine by testing patient-derived cell responses to different therapeutic agents.
- Educational tool for demonstrating cell migration and drug interaction principles in biomedical engineering or oncology.
