The effect of polyamine depletion on the survival response of human lung carcinoma cells (A-549) to acute heating at 45°C and its effect on the induction and decay of thermotolerance were investigated in exponential and plateau-phase cells. A 48-h exposure to 1 mM α-difluoromethylornithine (DFMO), an irreversible inhibitor of ornithine decarboxylase, was used to deplete intracellular levels of putrescine and spermidine. Inhibition of polyamine synthesis had no effect on the survival of exponential cells to heating at 45°C, but slightly enhanced the killing of slowly proliferating plateau-phase cells. While DFMO treatment did not inhibit the development of thermotolerance, it caused a reduction in the thermotolerance ratio of exponential cells from 2.6 to 1.80, and from 1.66 to 1.59 in plateau-phase cells. DFMO caused thermotolerance to decay more rapidly in polyamine-depleted cells as well. Flow cytometry demonstrated that DFMO did not alter the cell cycle distribution of plateau-phase cells (i.e., >73% in G1/ G0), but caused a block and time-dependent accumulation of exponential cells in G1/ G0. The cytostatic properties of DFMO in exponential cells which favor its use with phase-specific agents, and its ability to alter the magnitude and decay of thermotolerance in human carcinoma cells suggest a potential role for this nontoxic agent in clinically oriented hyperthermia studies.
Skip Nav Destination
Research Article| October 01 1990
Hyperthermia Studies in Polyamine-Altered Human Lung Carcinoma Cells
Laurie Roizin-Towle ;
Nigel Yarlett ;
John P. Pirro ;
Radiat Res (1990) 124 (1s): S80–S87.
- Views Icon Views
- Share Icon Share
- Search Site
Laurie Roizin-Towle, Nigel Yarlett, John P. Pirro, Tom M. Delohery; Hyperthermia Studies in Polyamine-Altered Human Lung Carcinoma Cells. Radiat Res 1 October 1990; 124 (1s): S80–S87. doi: https://doi.org/10.2307/3577681
Download citation file:
Citing articles via
Commonalities Between COVID-19 and Radiation Injury
Carmen I. Rios, David R. Cassatt, Brynn A. Hollingsworth, Merriline M. Satyamitra, Yeabsera S. Tadesse, Lanyn P. Taliaferro, Thomas A. Winters, Andrea L. DiCarlo
Low-Dose Radiation Therapy (LDRT) for COVID-19: Benefits or Risks?
Pataje G. Prasanna, Gayle E. Woloschak, Andrea L. DiCarlo, Jeffrey C. Buchsbaum, Dörthe Schaue, Arnab Chakravarti, Francis A. Cucinotta, Silvia C. Formenti, Chandan Guha, Dale J. Hu, Mohammad K. Khan, David G. Kirsch, Sunil Krishnan, Wolfgang W. Leitner, Brian Marples, William McBride, Minesh P. Mehta, Shahin Rafii, Elad Sharon, Julie M. Sullivan, Ralph R. Weichselbaum, Mansoor M. Ahmed, Bhadrasain Vikram, C. Norman Coleman, Kathryn D. Held
Germicidal Efficacy and Mammalian Skin Safety of 222-nm UV Light
Manuela Buonanno, Brian Ponnaiya, David Welch, Milda Stanislauskas, Gerhard Randers-Pehrson, Lubomir Smilenov, Franklin D. Lowy, David M. Owens, David J. Brenner
Photon GRID Radiation Therapy: A Physics and Dosimetry White Paper from the Radiosurgery Society (RSS) GRID/LATTICE, Microbeam and FLASH Radiotherapy Working Group
Hualin Zhang, Xiaodong Wu, Xin Zhang, Sha X. Chang, Ali Megooni, Eric D. Donnelly, Mansoor M. Ahmed, Robert J. Griffin, James S. Welsh, Charles B. Simone, II, Nina A. Mayr