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Generation and Quantitative Analysis of Pulsed Low Frequency Ultrasound to Determine the Sonic Sensitivity of Untreated and Treated Neoplastic Cells
Published on: July 22, 2015
Cellular inactivation by ultrasound.
G C Li1, G M Hahn, L J Tolmach
1Department of Radiology, Stanford university School of Medicine, California 94305, USA.
Nature
|May 12, 1977
Summary
Ultrasound (US) exhibits a non-thermal cytotoxic effect on mammalian cells, contributing to cell killing. This effect
Area of Science:
- Biophysics
- Cell Biology
- Oncology
Background:
- Ultrasound (US) is primarily used diagnostically at low power densities.
- Higher US intensities for cancer therapy lack sufficient cellular validation.
- Limited research exists on US-induced mammalian cell death and hyperthermia interaction.
Purpose of the Study:
- Investigate the direct cell-killing effects of ultrasound on mammalian cells.
- Determine the thermal and non-thermal components of US-induced cellular inactivation.
- Assess if direct US cell killing explains in vivo tumor cure rates observed in preliminary studies.
Main Methods:
- Quantitative determination of cell viability using colony formation assays.
- Examination of Chinese hamster cells exposed to ultrasound.
- Analysis of survival curves under varying temperature and US intensity conditions.
Main Results:
- Ultrasound demonstrates a definite non-thermal cytotoxic effect on cells.
- The contribution of this non-thermal effect to cell killing is highly temperature-dependent.
- Survival curves reveal a threshold effect where minor changes in temperature or US intensity significantly alter cell survival.
Conclusions:
- A non-thermal cytotoxic mechanism contributes to ultrasound-induced cell death.
- The temperature dependence and threshold nature of US effects are critical for therapeutic applications.
- Targeted ultrasound delivery could achieve significant tumor cell killing while sparing surrounding normal tissues.
