Cell sorting facs machine

Fluorescence-activated cell sorting (FACS) machine, a critical instrument for flow cytometry and isolating specific cell populations.

About this subject

The fluorescence-activated cell sorting (FACS) machine is a sophisticated instrument used in biology to isolate cells based on their physical and chemical properties. The operating principle involves passing a cell suspension through a laser beam, where each cell is individually analyzed for fluorescence after labeling with specific antibodies or dyes. Cells of interest are then electrically charged and deflected into collection tubes by electric fields, while others are discarded.

Developed in the 1960s by Leonard Herzenberg and colleagues at Stanford University, FACS revolutionized biomedical research by enabling the purification of rare cell populations, such as stem cells or specific lymphocytes. A historical milestone was the first separation of T helper and cytotoxic T cells, paving the way for advances in immunology. Modern instruments feature multiple lasers and detectors, capable of analyzing up to 30 parameters simultaneously, with sorting rates of thousands of cells per second.

Applications of FACS are vast: from diagnosing hematological diseases like leukemias to research in cell therapy, where genetically modified cells are isolated for personalized treatments. In immunology, it is used to characterize leukocyte subpopulations and study immune responses. In developmental biology, it allows isolation of cells at different differentiation stages. Additionally, the technique is essential in single-cell genomics, providing pure cells for sequencing or culture.

A technical curiosity is that the droplet sorting system uses ultrasonic vibration to generate uniform droplets, each containing a single cell. Precision is so high that more than 99% of target cells can be recovered with purity exceeding 95%. Despite its power, FACS requires trained operators due to calibration and maintenance complexity, as well as high costs of equipment and reagents.

Frequently Asked Questions

How does FACS cell sorting work?

FACS analyzes individual cells with lasers and classifies them based on emitted fluorescence. Cells of interest are electrically charged and deflected into collection tubes, while others are discarded.

What are the main applications of FACS in biology?

It is used to isolate stem cells, lymphocytes, cancer cells, and other rare populations. It is also essential in leukemia diagnosis, immunological research, and personalized cell therapy.

What is the difference between FACS and flow cytometry?

Flow cytometry only analyzes and quantifies cells, while FACS physically sorts the cells of interest for collection and subsequent use.