Radiosensitization of human lung fibroblasts by chemical that decrease ATP levels.
Radiosensitization by lactate, pyruvate, nalidixic acid and novobiocin was studied in exponentially growing SH-18L human lung fibroblasts. All the chemicals had a slight radiosensitizing effect at a low concentration and a definite effect at a higher one. Decreases in the D0 and/or Dq values were present in each dose survival curve. Fibroblasts incubated with the low concentration of each chemical for 24 hrs after X irradiation showed no reduction in intracellular ATP content, whereas, the higher concentration produced a significant decrease. These observations suggest that the decrease in the ATP content may be involved in the radiosensitization of human fibroblasts at high concentrations of these chemicals. In contrast, radiosensitization at a low concentration is not explained by a relationship to ATP content. Different mechanisms may be involved in radiosensitization at low and high concentrations of these chemicals.
Kumar
A
A
Department of Experimental Radiology, Shiga University of Medical Science, Japan.
Kimura
H
H
Aoyama
T
T
D000255:Adenosine Triphosphate / Q000032:analysis*; D016923:Cell Death / Q000187:drug effects; D002478:Cells, Cultured; D005347:Fibroblasts / Q000187:drug effects / Q000528:radiation effects; D006801:Humans; D007773:Lactates / Q000494:pharmacology; D019344:Lactic Acid; D008168:Lung / Q000737:chemistry / Q000187:drug effects* / Q000528:radiation effects*; D009268:Nalidixic Acid / Q000494:pharmacology; D009675:Novobiocin / Q000494:pharmacology; D011773:Pyruvates / Q000494:pharmacology; D019289:Pyruvic Acid; D011838:Radiation-Sensitizing Agents / Q000494:pharmacology*
D007773:Lactates; D011773:Pyruvates; D011838:Radiation-Sensitizing Agents; D009675:Novobiocin; D019344:Lactic Acid; D009268:Nalidixic Acid; D019289:Pyruvic Acid; D000255:Adenosine Triphosphate