High-Throughput Single-Cell Derived Sphere Formation for Cancer Stem-Like Cell Identification and Analysis

Area of Science:

• Oncology
• Biotechnology
• Microfluidics

Background:

• Malignancies are often driven by cancer stem-like cells (CSCs) with stem cell properties.
• Current CSC identification methods (markers, enzymatic activity) face limitations due to heterogeneity and plasticity.
• In-vitro sphere formation is a viable method but is labor-intensive and low-throughput.

Purpose of the Study:

• To develop a high-throughput microfluidic platform for single-cell derived sphere formation.
• To enable reliable identification and downstream clonal analysis of cancer stem-like cells (CSCs).
• To overcome limitations of existing CSC detection methods.

Main Methods:

• A 1,024-microchamber microfluidic device was engineered for single-cell capture and sphere formation.
• Hydrodynamic focusing was employed to achieve high single-cell occupancy (>70%).
• Single-cell derived spheres were retrieved for dissociation and analysis using a 96-gene panel.

Main Results:

• The microfluidic platform successfully facilitated single-cell derived sphere formation from heterogeneous cancer cell populations.
• High single-cell capture efficiency allowed for monitoring of CSC sphere formation.
• Downstream analysis of clonal CSC spheres revealed intra-tumor heterogeneity.

Conclusions:

• The developed microfluidic platform offers a reliable and high-throughput solution for CSC identification.
• This technology supports detailed clonal analysis of CSCs, advancing cancer stem cell research.
• The platform facilitates a deeper understanding of tumor heterogeneity and CSC biology.