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Effect of protracted mild hyperthermia on polymerase activity in a human melanoma cell line.

Radioresistant human melanoma SkMel-3 was evaluated with its sensitivity to thermal cell killing and polymerase inactivation. Cells were heated from 40 to 45 degrees C and demonstrated no thermal tolerance development for any of the temperatures tested. In addition, at 45 degrees C the heat survival curve showed a large shoulder indicating capacity for accumulation of sublethal heat damage. Also at 45 degrees C heating polymerase beta was more sensitive than polymerase alpha + delta + epsilon. At 42 degrees C, the polymerase sensitivities were nearly the same but at the lower temperatures (41 and 40 degrees C) polymerase beta became progressively more resistant than the polymerase alpha + delta + epsilon. Thus, mild hyperthermia effects may be different than high temperature hyperthermia and may be related to polymerase alpha + delta + epsilon activity.