• Anticancer research · Nov 1993

    The effect of local anaesthetics on the thermal sensitivity of HTC cells.

    • C A Kingston, S Ladha, R Manning, and K Bowler.
    • Department of Biological Sciences, University of Durham, U.K.
    • Anticancer Res. 1993 Nov 1; 13 (6A): 2335-40.

    AbstractLocal anaesthetics caused death of HTC cells, and the order of toxicity (dibucaine > tetracaine > procaine) correlated with their oil:water partition coefficients. Cytotoxic effects of hyperthermia were enhanced by subtoxic levels of anaesthetics and again, their potency was related to the oil:water partition coefficients. DPH fluidity in plasma membranes at 37 degrees C was increased by dibucaine and tetracaine but not by procaine up to 5mM. At 43 degrees C, plasma membrane fluidity was increased by dibucaine but not by tetracaine or procaine. The results suggest that fluidisation of the hydrophobic core of the membrane may contribute to anaesthetic potentiation of heat cell death.

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