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Glyoxylic compounds as radiosensitizers of hypoxic cells.

Abstract
The radiosensitizing effect of five glyoxal derivatives on the survival of TC-SV40 cells has been measured, under aerobic and hypoxic conditions. A toxicity study was previously performed in order to use nontoxic concentrations. The OER for the TC-SV40 cells was 2.74. None of the glyoxylic compounds showed radiosensitizing activity under aerobic conditions while in hypoxia their radiosensitizing factors decreased in the order phenylglyoxylic acid (1.68 at 8 x 10(-3) mole dm-3) greater than phenylglyoxal (1.55 at 5 x 10(-6) mole dm-3) greater than 2-2' furil (1.48 at 5 x 10(-5) mole dm-3) greater than glyoxylic acid (1.39 at 1 x 10(-3) mole dm-3) greater than glyoxal (1.30 at 5 x 10(-5) mole dm-3). The dose-modifying factors were also determined at two equimolar concentrations 5 x 10(-5) and 5 x 10(-6) mole dm-3. A concentration effect was noticed for all the compounds although their relative radiosensitizing activity kept, independently of the concentration, the same order noted above. Glyoxals with aromatic or heterocyclic rings exert a greater radiosensitization than the others. The acidic compounds have less radiosensitizing activity than their aldehydic counterparts. Interaction of these glyoxals with NPSH cellular groups was tested and the low degree of inhibition shows that this mechanism would contribute very little, if any, to the radiosensitization effect.
AuthorsM P Cornago, M C Lopez Zumel, M V Alvarez, M C Izquierdo
JournalBiochemical medicine and metabolic biology (Biochem Med Metab Biol) Vol. 43 Issue 3 Pg. 253-62 (Jun 1990) ISSN: 0885-4505 [Print] United States
PMID2383429 (Publication Type: Journal Article)
Chemical References
  • Glyoxylates
  • Radiation-Sensitizing Agents
  • Sulfhydryl Compounds
Topics
  • Animals
  • Cell Hypoxia (drug effects)
  • Cell Survival (drug effects, radiation effects)
  • Glyoxylates (pharmacology)
  • Molecular Structure
  • Radiation-Sensitizing Agents
  • Sulfhydryl Compounds (metabolism)
  • Tumor Cells, Cultured

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