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Revolutionary ‘Electro-LEV’ System Uses Magnetic Fields to Precisely Sort Cells in Real-Time
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A new device employing electromagnetic levitation promises to dramatically improve cell sorting for critical applications like cancer research and drug screening. The system, dubbed Electro-LEV, offers unprecedented control and precision, overcoming limitations of previous magnetic levitation techniques.
Researchers have long sought efficient methods to isolate specific cell types for analysis. Traditional methods can be slow, expensive, and even damage delicate cells. A 2015 magnetic levitation system allowed for visual differentiation of cells, but lacked the ability to adjust conditions mid-experiment and struggled with subtle differences between cell types. The new Electro-LEV system addresses thes challenges head-on.
Overcoming Static Limitations with Dynamic Control
The key innovation lies in the addition of electromagnetic coils to both magnets within the system. By precisely adjusting the electric current flowing through these coils, scientists can instantaneously modify the magnetic force applied to individual cells. “With our current design, you can very precisely manipulate the cells to seperate them further,” one researcher explained. This dynamic control was previously unattainable.
The Electro-LEV system functions by levitating cells at distinct heights, then sorting them as they flow out of a capillary tube, branching into separate outlets. This allows for continuous and adaptable separation.”If the sorting is not going well, you just change the current,” the researcher added. “Everything is under your control in real time, so it’s more user-friendly.”
From Live to Dead: A Powerful New Application
The research team demonstrated Electro-LEV’s capabilities by successfully sorting a variety of cell types, including breast cancer cells, lung cancer cells, fibroblasts, and white blood cells. Crucially, they also tackled the common problem of separating live cells from dead cells – a vital step for accurate single-cell RNA sequencing and reliable drug toxicity screening.
Dead cells, due to compromised cell membranes, tend to absorb more of a paramagnetic solution, increasing their density and causing them to levitate at a lower height. In experiments, Electro-LEV was able to purify a sample containing 50% live cells to approximately 93% live cells. Even starting with a sample of only 10% live cells, the system achieved a purity of around 70%.
Detecting Aggressive Cancer Cells Through Levitation Speed
Beyond simply separating live and dead cells, the system revealed a potentially groundbreaking method for identifying aggressive cancer cells. Researchers discovered that cancer cell clusters reacted more quickly to changes in the magnetic field than individual cancer cells.This difference is attributed to the surface area-to-volume ratio and resulting drag force. This suggests that levitation speed could serve as a biomarker for identifying clusters of cancer cells, which are known to be more prone to metastasis.
The potential applications of this technology extend far beyond cancer research. The researcher envisions using electromagnetic levitation for sorting microbes, assembling organoids, and even controlling microrobots. “It’s a broad, versatile platform,” she
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