Modification of pH induced cellular inactivation by irradiation-glial cells

Erwin M. Röttinger, Marc Mendonca, Leo E. Gerweck

Research output: Contribution to journalArticle

23 Scopus citations


Human cells of glial origin were examined for clonogenic survival after exposure to subnormal pH of the extracellular fluid for 0 to 5 days at 37°C. The surviving fraction decreased at pH values between 6.7 and 6.4 to 10% within 2 days. Cells that survived irradiation demonstrated a decreased sensitivity to an acid extracellular fluid. The radiation response function was established with and without incubation at pH 6.7 for 66 hours. Doses above 4 Gray resulted in a higher survival at pH 6.7 than at pH 7.4, if pH was reduced 15 hours prior to irradiation. Enhanced clonogenic survival after irradiation under conditions of continuous acidity in the extracellular space may be a further explanation for poor local control of malignant tumors in clinical radiation therapy.

Original languageEnglish (US)
Pages (from-to)1659-1662
Number of pages4
JournalInternational journal of radiation oncology, biology, physics
Issue number12
StatePublished - Dec 1980
Externally publishedYes


  • Extracellular milieu
  • Glioblastoma cells (human)
  • Hydrogen ion concentration
  • Low dose rate
  • Radiosensitivity
  • pH

ASJC Scopus subject areas

  • Radiation
  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Cancer Research

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