Cellular sensing platform with enhanced sensitivity based on optogenetic modulation of cell homeostasis

Area of Science:

• Biotechnology
• Biosensing
• Cellular Physiology

Background:

• Current cell-based biosensors lack sensitivity and speed for point-of-need applications.
• Optogenetic tools offer precise control over cellular functions.
• Optical control of ion homeostasis is a developing area in bioanalysis.

Purpose of the Study:

• To develop a novel biosensing concept for rapid and sensitive cell-based detection.
• To utilize optogenetics for enhanced cellular responses to bioactive stimuli.
• To improve the sensitivity and speed of cell-based biosensors for bioanalysis.

Main Methods:

• Stable transfection of cells with light-sensitive protein channels.
• Optogenetic stimulation for optical control of membrane potential and ion homeostasis.
• Time-lapse impedance measurements to monitor cell dynamics and responses.

Main Results:

• Light-driven perturbations of cell membrane potential induce homeostatic reactions.
• Optogenetic stimulation amplifies cellular responses to bioactive compounds, enabling faster detection.
• Detection of low analyte concentrations (e.g., 25 microM CdCl2) in under 30 minutes, significantly faster than traditional methods.
• Discrimination between analytes with different modes of action (CdCl2 toxicity vs. ouabain ion pump inhibition).

Conclusions:

• This optogenetic biosensing concept significantly enhances sensitivity and response time for cell-based assays.
• The method allows for rapid and sensitive detection of bioactive and toxic analytes at low concentrations.
• This approach represents a significant advancement for state-of-the-art cell-based sensors, enabling better bioanalysis.