The Antivascular Action of Physiotherapy Ultrasound on Murine Tumors

Overview

Journal Ultrasound Med Biol

Specialty Radiology

Date 2005 Oct 15

PMID 16223644

Citations 40

Authors

Andrew K W Wood

Sara Ansaloni

Lisa S Ziemer

William M-F Lee

Michael D Feldman

Chandra M Sehgal

Affiliations

Soon will be listed here.

Abstract

This study was aimed at determining if physiotherapy ultrasound (US) affected the fragile and leaky angiogenic blood vessels in a tumor. In 22 C3HV/HeN mice, a subcutaneous melanoma (K1735(22)) was insonated (1, 2 or 3 min) with continuous 1-MHz low-intensity (spatial-average temporal-average = 2.28 W cm(-2)), physiotherapy US. Contrast-enhanced (0.1 mL Optison) power Doppler US observations were made and histogram analyses of the images were performed. Before insonation, all but 7% of the tumor was perfused. The avascular area in tumors receiving 3-min treatment increased to 82% (p < 0.001). A linear regression analysis showed that each min of insonation led to a 25% reduction in tumor vascularity; the antivascular activity persisted for 24 h. Histology demonstrated disruption of vascular walls and tumor cell death in areas of vascular congestion and thrombosis. Physiotherapy US particularly targeted the vascular structures, and the effects on tumor cells appeared to be secondary to the resultant ischemia.

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