Isolation of Phenotypically Distinct Cancer Cells Using Nanoparticle-Mediated Sorting.

Area of Science:

• Biotechnology
• Cancer Research
• Microfluidics

Background:

• Isolating heterogeneous cancer cell subpopulations is crucial for understanding tumor progression and the epithelial-to-mesenchymal transition.
• Characterizing circulating tumor cells (CTCs) requires methods to distinguish cells with varying phenotypes.

Purpose of the Study:

• To develop and validate a microfluidic device for separating distinct cancer cell subpopulations.
• To associate cell surface marker expression (EpCAM) with functional characteristics related to invasiveness and metabolic activity.

Main Methods:

• Utilized a microfluidic device with magnetic nanoparticles coated with antibodies against epithelial cell adhesion molecule (EpCAM).
• Separated breast cancer cells based on EpCAM expression levels.
• Assessed phenotypic properties of isolated subpopulations, including collagen uptake and NAD(P)H metabolic activity.

Main Results:

• Low-EpCAM expressing cells exhibited higher collagen uptake and folate-induced NAD(P)H responses compared to high-EpCAM cells.
• Hypoxia-induced cells showed reduced EpCAM expression, increased collagen uptake, and higher NAD(P)H metabolism.
• Nanoparticle-mediated sorting successfully isolated functionally distinct cell subpopulations.

Conclusions:

• The microfluidic device effectively isolates cancer cell subpopulations with differing phenotypes and functional characteristics.
• Epithelial cell adhesion molecule (EpCAM) expression levels correlate with invasiveness markers like collagen uptake and metabolic activity.
• This technology aids in associating surface marker expression with cancer cell invasiveness and progression.