A multicellular spheroid-based sensor for anti-cancer therapeutics

Area of Science:

• Cellular Engineering
• Bioelectronic Systems
• Cancer Therapy Screening

Background:

• Advancements in cellular engineering provide new avenues for anti-cancer treatments.
• Efficient screening methods are crucial for evaluating potential therapies.
• Multicellular spheroid models offer promising platforms for bioelectronic screening.

Purpose of the Study:

• To develop and validate an impedance measurement system for bioelectronic screening of anti-cancer therapies.
• To utilize gene-manipulated breast carcinoma spheroids for non-destructive diagnostics and therapy assessment.
• To investigate the efficacy of an antisense-butyrylcholinesterase expression system in inhibiting tumor cell proliferation.

Main Methods:

• A biohybrid sensor system integrating gene-manipulated T47D clone 11 breast carcinoma spheroids within a capillary system with electrodes.
• Hydrodynamic positioning of spheroids for efficient measurement.
• Application of an antisense-5'butyrylcholinesterase expression system under simulated microgravity.
• Impedance spectroscopy to monitor alterations in cell aggregate morphology (apoptosis, necrosis).

Main Results:

• The system enables high-resolution, reproducible detection of cellular changes via impedance spectroscopy.
• Successful inhibition of butyrylcholinesterase gene transcription and translation in reaggregated tumor cells.
• Demonstration of hydrodynamic positioning for synchronized multicapillary screening.
• Capability for cyclic, long-term impedance spectral recordings when coupled with a bioreactor.

Conclusions:

• The proposed impedance measurement system facilitates efficient and non-destructive screening of anti-cancer therapies using multicellular spheroids.
• The novel antisense approach effectively targets a key proliferation marker in tumor cells.
• This bioelectronic screening platform offers a synchronized, high-throughput method for evaluating therapeutic interventions.