heat-induced thermal resistance (thermotolerance) presents important considerations in the application of fractionated hyperthermia in cancer therapy. The long-term objective of this project is to answer the question: can thermotolerance be induced purposefully in selected normal tissue while niminizing its induction in tumor tissue, in order to maximize the therapeutic efficacy of localized herperthermia in the treatment of cancer? We plan to investigate systematically the phenomeon of thermotolerance. As part of this study, we hope to develop an assay us to determine the degree of thermotolerance existing in various tissues, both normal and malignant. This assay could conceivably be extended to the clinic. for this purpose we propose: 1. to quantify the kinetics of the development of thermotolerance in vitro and in vivo; 2. to correlate the kinetics of the development of thermotolerance with the kinetics of the synthesis of heat shock proteins; and 3. to investigate the possibility of using the quantification of heat shock proteins as a new assay both for thermal sensitivity of various tumors and normal tissues, as well as for the kinetics of thermotolerance developoment. Cellular survival will be assayed by colony formation techniques. Tumor response will be determined by in vivo/in vitro cell survival and in vivo/in vivo tumor regression/regrowth assay. The measurement of normal tissue damage will include skin reaction grading, intestinal crypt cell survival, and mouse bone marrow CFUs assay. Heat shock proteins will be identified by comparing proteins synthesized by heat-treated cells with protein synthesized by non-treated controls using SDSpolyacrylamide gel electrophoresis. The results of the proposed work will test the validity of our working hypothesis, that is, that the synthesis of heat shock proteins is causally related to the development of thermotolerance in mammalian cells and in various tissues. A positive correlation between the kinetics of synthesis of heat shock proteins would suggest using quantification of the rate of synthesis and total synthesis of heat shock proteins to predict thermal responses.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA031397-04
Application #
3169571
Study Section
Radiation Study Section (RAD)
Project Start
1982-02-01
Project End
1987-01-31
Budget Start
1985-02-01
Budget End
1986-01-31
Support Year
4
Fiscal Year
1985
Total Cost
Indirect Cost
Name
University of California San Francisco
Department
Type
Schools of Medicine
DUNS #
073133571
City
San Francisco
State
CA
Country
United States
Zip Code
94143
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Li, Xiao-Ling; Shen, Shou-Rong; Wang, Sa et al. (2002) Restoration of T cell-specific V(D)J recombination in DNA-PKcs(-/-) mice by ionizing radiation: The effects on survival, development, and tumorigenesis. Sheng Wu Hua Xue Yu Sheng Wu Wu Li Xue Bao (Shanghai) 34:149-57
Wang, S; Guo, M; Ouyang, H et al. (2000) The catalytic subunit of DNA-dependent protein kinase selectively regulates p53-dependent apoptosis but not cell-cycle arrest. Proc Natl Acad Sci U S A 97:1584-8
Kim, D; Kim, S H; Li, G C (1999) Proteasome inhibitors MG132 and lactacystin hyperphosphorylate HSF1 and induce hsp70 and hsp27 expression. Biochem Biophys Res Commun 254:264-8
Hurd, Y L; Yakovleva, T; Nussenzweig, A et al. (1999) A novel neuron-specific DNA end-binding factor in the murine brain. Mol Cell Neurosci 14:213-24
Kurimasa, A; Ouyang, H; Dong, L J et al. (1999) Catalytic subunit of DNA-dependent protein kinase: impact on lymphocyte development and tumorigenesis. Proc Natl Acad Sci U S A 96:1403-8
Wachsberger, P R; Li, W H; Guo, M et al. (1999) Rejoining of DNA double-strand breaks in Ku80-deficient mouse fibroblasts. Radiat Res 151:398-407
Kim, D; Li, G C (1999) Proteasome inhibitors lactacystin and MG132 inhibit the dephosphorylation of HSF1 after heat shock and suppress thermal induction of heat shock gene expression. Biochem Biophys Res Commun 264:352-8
Li, G C; Ouyang, H; Li, X et al. (1998) Ku70: a candidate tumor suppressor gene for murine T cell lymphoma. Mol Cell 2:1-8
Burgman, P; Ouyang, H; Peterson, S et al. (1997) Heat inactivation of Ku autoantigen: possible role in hyperthermic radiosensitization. Cancer Res 57:2847-50

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