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The Effect of Hyperthermia on Intracellular Sodium Concentrations of Isolated Human Cells a

A Na+-sensitive dye (sodium green) was introduced into squamous epithelial human cheek cells. The cells were radiated with ultranarrow flashes of low energy laser radiation (488 nM) directed through a microscope (ACAS 570, Meridian Inst. Co.). Normalized average cell fluorescence was detected with a photomultiplier, stored within an internal computer and rendered into a 2-dimensional pseudocolor image, with the color related to normalized fluorescence intensity. It is technically difficult to calibrate absolute fluorescence as a function of sodium concentration inside the cell, and only changes in normalized fluorescence as a function of time are reported here. Cells (n >14) were placed into groups to be heated from 37°C to different final temperatures. They were exposed to a baseline temperature of 37°C for 10 min, raised to a new temperature, maintained at that new temperature for 20 min, cooled back to 3TC, and maintained at that temperature for 10 min.