Localized versus regional hyperthermia: Comparison of xenotransplants treated with a small animal ultrasound system and waterbath limb immersion

J. Locke, A. Zeug, D. Thompson, J. Allan, K. Mazzarella, P. Novak, D. Hanson, A. K. Singh, Eduardo G. Moros, T. K. Pandita

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The response of xenotransplants were compared with waterbath immersion vs focal ultrasound (US) hyperthermia using tumour growth delay, immunhistochemistry and histopathology assays. Waterbath hyperthermia was performed by limb immersion. Precautions were taken to minimize total body heating by surrounding the mouse with plastic insulators. Thermometry was performed with clinical-grade, 20-gauge needle thermocouples and monitored with a Labthermics unit. Significant differences in cytotoxicity between ultrasound and waterbath treatment of tumors at 43°C were observed as determined by TUNNEL assay. Conversely, contralateral (non-treated) tumours in animals treated with similar temperature demonstrated no significant differences between modalities. Western blot analysis revealed increased hsp70 induction at 43°C in waterbath vs focal ultrasound hyperthermia. Comparison of tumour growth delay between tumours heated with waterbath vs ultrasound at 43°C but not at 41°C revealed significant differences. This is the first study comparing localized vs regional hyperthermia using the small animal ultrasound system (SAHUS) delivery system. Consistent ultrasound hyperthermia can be achieved throughout a xenotransplant. At equivalent temperature of 43°C for 60 min, waterbath hyperthermia demonstrated greater local response vs ultrasound hyperthermia.

Original languageEnglish (US)
Pages (from-to)271-281
Number of pages11
JournalInternational Journal of Hyperthermia
Volume21
Issue number3
DOIs
StatePublished - May 2005

Keywords

  • Hyperthermia
  • Local
  • Regional
  • Ultrasound
  • Xenotransplant

ASJC Scopus subject areas

  • Cancer Research
  • Radiological and Ultrasound Technology

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