Gating a Single Cell: A Label-Free and Real-Time Measurement Method for Cellular Progression

Area of Science:

• Biotechnology
• Cancer Research
• Cell Biology

Background:

• Advanced methods are needed to study cancer cell responses to novel therapies.
• Monitoring cell death in real time is crucial for evaluating treatment efficacy.
• Existing methods for single-cell analysis can be invasive or lack real-time capabilities.

Purpose of the Study:

• To develop and validate a label-free, real-time method for monitoring individual cancer cell responses to therapies.
• To assess cancer cell mortality using a single cell gated transistor (SCGT).
• To establish a non-invasive technique for studying cellular electrical responses.

Main Methods:

• Utilized a single cell gated transistor (SCGT) to monitor HeLa cells in situ.
• Measured changes in threshold voltage of the SCGT correlated with cell apoptosis.
• Verified SCGT data with scanning electron microscopy (SEM) for cell morphology and inductively-coupled plasma mass spectrometry (ICPMS) for ion concentration.

Main Results:

• The SCGT successfully monitored individual HeLa cell responses to apoptotic stimuli in real time.
• Changes in cell morphology and ion concentration during apoptosis directly correlated with SCGT threshold voltage shifts.
• Demonstrated the SCGT's capability for label-free, in situ monitoring of cell death.

Conclusions:

• The SCGT provides a novel, label-free, and real-time method for assessing cancer cell death and response to therapies.
• This technology offers a potential replacement for patch clamps in studying single-cell electrical activity.
• The SCGT enables the study of cellular electrical responses to stimuli while maintaining membrane integrity.