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Cell Biology JoVE (Open Access) Citable · DOI

Determining the Optimal Inhibitory Frequency for Cancerous Cells Using Tumor Treating Fields (TTFields)

DOI: 10.3791/55820-v
What you'll learn
  • ✓ Set up an in vitro TTFields application system for cancer cell lines
  • ✓ Apply intermediate-frequency alternating electric fields at varying frequencies
  • ✓ Evaluate frequency-dependent inhibitory effects on tumor cell growth
  • ✓ Determine optimal TTFields frequency for maximum cell count reduction
Protocol

Tumor Treating Fields (TTFields) are an effective anti-tumor treatment modality delivered via the continuous, noninvasive application of low-intensity, intermediate-frequency, alternating electric fields. TTFields application to cell lines using a TTFields in vitro application system allows for the determination of the optimal frequency that leads to the highest reduction in cell counts.

Difficulty
intermediate
Total time
~5–7 days (depending on cell line doubling time and frequency screening protocol)
Model organism
Cancer cell lines (unspecified in abstract; in vitro system)
Biosafety
BSL-1

Steps

1
Prepare TTFields in vitro application system

Assemble and configure the TTFields in vitro apparatus according to manufacturer specifications. Verify electrode placement, electrical connections, and control settings before cell seeding.

▶ 01:00
2
Apply TTFields at designated frequencies

Deliver continuous, noninvasive low-intensity intermediate-frequency alternating electric fields to cultured cancer cells at multiple test frequencies. Monitor field delivery throughout the experimental period.

▶ 02:32
3
Quantify inhibitory effects on cell growth

Measure cell counts and viability across all frequency conditions using standard cell enumeration methods. Compare treated versus control samples to assess frequency-dependent growth inhibition.

▶ 05:17
4
Identify optimal frequency for maximum inhibition

Analyze cell count reduction data across all tested frequencies to determine which frequency produces the strongest anti-tumor effect. Interpret results to establish optimal treatment parameters.

▶ 06:04
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