SRC family kinase inhibitor SU6656 enhances antiangiogenic effect of irradiation

Kyle C. Cuneo, Ling Geng, Jiahuai Tan, Jeffrey Brousal, Eric T. Shinohara, Katherine Osusky, Allie Fu, Yu Shyr, Huiyun Wu, Dennis E. Hallahan

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Purpose: Src family kinases (SFK) have been identified as molecular targets. SU6656 is a small-molecle indolinone that specifically inhibits this family of kinases. Methods and Materials: Human umbilical vein endothelial cells were used to study the effects of SFK inhibition. Western blot analysis was performed to determine the effect of SFK inhibition on the PI3K/Akt pathway and caspase cleavage. Apoptosis was studied by propidium iodide staining of nuclei. Angiogenesis was examined using capillary tubule formation in Matrigel. Tumor response was further studied in vivo using Lewis lung carcinoma cells implanted into the dorsal skin fold of mice in the window model and in the hind limb in the tumor volume model. Results: Clonogenic survival of endothelial cells was decreased after the combined therapy of SU6656 and radiation compared with radiotherapy alone. Furthermore, SFK inhibition by SU6656 attenuated radiation-induced Akt phosphorylation and increased radiation-induced apoptosis and vascular endothelium destruction. In vivo, SU6656 administered before irradiation significantly enhanced radiation-induced destruction of blood vessels within the tumor windows and enhanced tumor growth delay when administered during fractionated irradiation. Conclusions: This study demonstrates the potential use of SFK inhibition to enhance the effects of ionizing radiation during radiotherapy.

Original languageEnglish
Pages (from-to)1197-1203
Number of pages7
JournalInternational Journal of Radiation Oncology Biology Physics
Issue number4
StatePublished - Mar 15 2006


  • Angiogenesis
  • Radiosensitizer
  • SFK
  • SU6656
  • Src family kinase


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