The role of intracellular free calcium in the cellular response to hyperthermia.
The intracellular free calcium (Ca++i) concentration was measured in several cell lines after heating at 45.0 degrees C using flow cytometry with indo-1. Chinese hamster ovary 10B2 (CHO) cells do not stain well with indo-1, so a CHO mutant cell line (CHO IS1) isolated in our laboratory with much-improved stainability for indo-1 was used to study CA++i changes in heated CHO cells. BALB-3T3 (mouse) and EJ30 (human) cells were also studied. Cells were heated in the sample holder of the cell sorter in order to measure Ca++i within seconds after heating. Ca++i increased rapidly within the first 5 min of heating at 45.0 degrees C in all three lines, though the magnitude of the increase varied for each cell line. The Ca++i returned rapidly to baseline after heating in CHO IS1 cells and BALB-3T3 cells. After 5 min of heating, the Ca++i plateaued in the EJ30 and IS1 cells, but decreased in the 3T3 cells. There was an inverse relationship between the Ca++i after 10 min at 45 degrees C and survival for the different cell lines. Thermotolerant cells experienced a similar change in Ca++i during heating as non-thermotolerant cells, though the kinetics were somewhat different for the IS1 cells. A bimodal distribution of Ca++i developed in EJ30 cells by 2 min after heating. Cells sorted from the near-normal Ca++i region of the histogram had a 2-fold higher survival rate than the cells which had a high Ca++i concentration. These data support the view that Ca++i changes during heating are not the principal factor in heat-induced cell death.
Wieder
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Department of Radiological Health Sciences, Colorado State University, Fort Collins 80523, USA.
Fox
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MH
D016475:3T3 Cells; D000818:Animals; D016466:CHO Cells; D002118:Calcium / Q000378:metabolism*; D016923:Cell Death / Q000502:physiology; D002460:Cell Line; D002470:Cell Survival / Q000502:physiology; D006224:Cricetinae; D005456:Fluorescent Dyes; D006358:Hot Temperature / Q000009:adverse effects; D006801:Humans; D006979:Hyperthermia, Induced; D007211:Indoles; D007424:Intracellular Fluid / Q000378:metabolism*; D051379:Mice
D005456:Fluorescent Dyes; D007211:Indoles; C048960:indo-1; D002118:Calcium