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. 1991 Jun 1;276(Pt 2):357–362. doi: 10.1042/bj2760357

Potentiation of thermal inactivation of glyceraldehyde-3-phosphate dehydrogenase by photodynamic treatment. A possible model for the synergistic interaction between photodynamic therapy and hyperthermia.

C Prinsze 1, T M Dubbelman 1, J Van Steveninck 1
PMCID: PMC1151099  PMID: 1828665

Abstract

Thermal inactivation of glyceraldehyde-3-phosphate dehydrogenase appeared to be caused by a conformational mechanism, without involvement of covalent reactions. On the other hand, photodynamic inactivation of the enzyme (induced by illumination in the presence of Photofrin II) was caused by photo-oxidation of the essential thiol group in the active centre. A short photodynamic treatment of the enzyme, leading to only a limited inactivation, caused a pronounced potentiation of subsequent thermal inactivation, as measured over the temperature range 40-50 degrees C. Analysis of the experimental results according to the Arrhenius equation revealed that both the activation energy of thermal inactivation and the frequency factor (the proportionality constant) were significantly decreased by the preceding photodynamic treatment. The experimental results indicate a mechanism in which limited photodynamic treatment induced a conformational change of the protein molecule. This conformational change did not contribute to photodynamic enzyme inhibition, but was responsible for the decreased frequency factor and activation energy of subsequent thermal inactivation of the enzyme. The opposing effects of decreased activation energy and decreased frequency factor resulted in potentiation of thermal inactivation of the enzyme over the temperature range 40-50 degrees C. With other proteins, different results were obtained. With amylase the combined photodynamic and thermal effects were not synergistic, but additive, and photodynamic treatment had no effect on the frequency factor and the activation energy of thermal inactivation. With respect to myoglobin denaturation, the photodynamic and thermal effects were antagonistic over the whole practically applicable temperature range. Limited photodynamic treatment protected the protein against heat-induced precipitation, concomitantly increasing both the frequency factor and the activation energy of the process. These results offer a model for one of the possible mechanisms of synergistic interaction between photodynamic therapy and hyperthermia in cancer treatment.

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Selected References

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