TISSUE DIELECTRIC CHANGES DUE TO HYPERTHERMIA

高温引起的组织介电变化

• 批准号: 2410853
• 负责人: DONALD A MC RAE
• 金额: $ 17.19万
• 依托单位: GEORGETOWN UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-05-05 至 2000-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/2410853
• 关键词: apoptosis; athymic mouse; cell line; electrical impedance; electron microscopy; histopathology; human tissue; hyperthermia; method development; necrosis; neoplasm /cancer diagnosis; neoplastic process; noninvasive diagnosis; verapamil; xenotransplantation

DESCRIPTION: Cancer therapies of all forms, radiation, cytotoxic drugs, hyperthermia, etc., have one goal in common. That goal is to eradicate cancer cells. Therefore, when therapies are being tested in the laboratory or applied in the clinic, the ability to which they eradicate the cancer cells needs to be evaluated. Typically, endpoints such as tumor-growth-delay or tumor regression are used, or if intermediate information is desired, invasive tissue samples must be taken. Recently, it has been determined that cells predominantly respond to all forms of treatment of deleterious stimuli in two ways; via programmed cell death (apoptosis) and/or via necrosis. The aim of this proposal is to test the capability of Electrical Impedance Spectroscopy (EIS) to detect and identify these two forms of cell response via non-invasive, in vivo measurements in solid human xenografts grown in nude mice. Treatment with hyperthermia, with and without verapamil, will be used to induce the different forms of cell response. Then electrical impedance measurements of the tumors will be made during the period between application of the treatment and manifestation of tumor-growth-delay. These EIS measurements will aim to monitor the real-time cellular-level response of the tumor during this period. The work will test the hypotheses: 1. It is possible to make long-term, reliable, repeatable, non-invasive, in vivo Electrical Impedance Spectroscopy (EIS) measurements of the electrical properties of tissues. 2. EIS is capable of detecting and characterizing long-term, hyperthermia-induced, necrotic response sequences during their occurrence, and of discriminating between different characteristics in the necrotic responses caused by different treatments which result in different tumor-growth-delays. 3. EIS is capable of detecting and characterizing the apoptotic cell response sequence within a solid tumor with high apoptotic index, using non-invasive, in vivo measurements. Progress and preliminary data demonstrate the feasibility of measuring cellular-level change with EIS.

描述：各种形式的癌症治疗，放疗，细胞毒性药物，