The lazaroid U74389G protects normal brain from stereotactic radiosurgery-induced radiation injury

John M. Buatti, William A. Friedman, Daniel P. Theele, Francis J. Bova, William M. Mendenhall

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


Purpose: To test an established model of stereotactic radiosurgery-induced radiation injury with pretreatments of either methylprednisolone or the lazaroid U74389G. Methods and Materials: Nine cats received stereotactic radiosurgery with a linear accelerator using an animal radiosurgery device. Each received a dose of 125.0 Gy prescribed to the 84% isodose shell to the anterior limb of the right internal capsule. One animal received no pretreatment, two received citrate vehicle, three received 30 mg/kg of methylprednisolone, and three received 5 mg/kg of U74389G. After irradiation, the animals had frequent neurologic examinations, and neurologic deficits developed in all of them. Six months after the radiation treatment, the animals were anesthetized, and had gadolinium-enhanced magnetic resonance (MR) scans, followed by Evans blue dye perfusion, euthanasia, and brain fixation. Results: Magnetic resonance scans revealed a decrease in the size of the lesions from a mean volume of 0.45 ± 0.06 cm3 in the control, vehicle-treated, and methylprednisolone-treated animals to 0.22 ± 0.14 cm3 in the U74389G-treated group. The scans also suggested the absence of necrosis and ventricular dilatation in the lazaroid-treated group. Gross pathology revealed that lesions produced in the untreated, vehicle-treated, and methylprednisolone-treated cats were similar and were characterized by a peripheral zone of Evans blue dye staining with a central zone of a mature coagulative necrosis and focal hemorrhage. However, in the U74389G-treated animals, the lesions were found to have an area of Evans blue dye staining, but lacked discrete areas of necrosis and hemorrhage. Conclusion: These results suggest that the lazaroid U74389G protects the normal brain from radiation injury produced by stereotactic radiosurgery.

Original languageEnglish (US)
Pages (from-to)591-597
Number of pages7
JournalInternational Journal of Radiation Oncology Biology Physics
Issue number3
StatePublished - Feb 1 1996
Externally publishedYes


  • Methylprednisolone
  • Radiation injuries
  • Radiation protection
  • Radiosurgery

ASJC Scopus subject areas

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


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