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. 1995 Mar;71(3):498–504. doi: 10.1038/bjc.1995.100

Cisplatin sensitivity and thermochemosensitisation in thermotolerant cDDP-sensitive and -resistant cell lines.

J V Hettinga 1, W Lemstra 1, A W Konings 1, H H Kampinga 1
PMCID: PMC2033632  PMID: 7880730

Abstract

Development of thermotolerance is an important phenomenon that must be considered when thermochemotherapy with multiple heat treatments is used clinically. To study the effect of thermotolerance on cellular cisplatin (cDDP) sensitivity at 37 degrees C and 43 degrees C in cell lines with different cDDP sensitivities, two Ehrlich ascites tumour cell lines (one with high cDDP sensitivity and one with in vitro acquired cDDP resistance) were used. The results indicate that in both cell lines the state of thermotolerance per se did not affect the cDDP sensitivity at 37 degrees C. Thus, general elevations in 'all' heat shock protein levels as found in thermotolerant cells apparently do not influence cDDP sensitivity to a considerable extent. The sensitising effect of a (second) heat treatment given simultaneously with a cDDP treatment was less in thermotolerant cells. Thermal enhancement ratios (TERs) at the 10% survival level for heat doses of 43 degrees C for 30 min or 43 degrees C for 60 min were reduced by a factor of 1.6 and 2.1 in cDDP-resistant and -sensitive thermotolerant cells respectively, as compared with control cells. Thus, protection against heat damage in thermotolerant cells seems to be paralleled by diminished thermal chemosensitisation. Although the effect of thermotolerance on the cDDP-sensitising effect was less pronounced in the resistant cells, a modifying effect on the resistance factor was not achieved.

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Selected References

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