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Related Experiment Videos

Radioresistance in murine solid tumors induced by interleukin-1

P G Braunschweiger1, V Basrur, O Santos

  • 1Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, University of Miami School of Medicine, Florida 33101, USA.

Radiation Research
|February 1, 1996
PubMed
Summary
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Interleukin-1 alpha (IL-1 alpha) induces transient radioresistance in tumors, potentially via hypoxia in vivo and oxidative stress in vitro. This finding impacts cancer treatment strategies involving radiation therapy.

Area of Science:

  • Oncology
  • Immunology
  • Radiation Biology

Background:

  • Interleukin-1 (IL-1) is known for radioprotective effects in normal tissues.
  • The impact of IL-1 alpha on tumor cell radiosensitivity remains largely unexplored.

Purpose of the Study:

  • To investigate the effects of IL-1 alpha on the radiosensitivity of RIF-1 and SCC-7 tumor cells.
  • To elucidate the mechanisms underlying IL-1 alpha-induced radioresistance in vivo and in vitro.

Main Methods:

  • Administered IL-1 alpha to mice bearing RIF-1 and SCC-7 tumors.
  • Assessed radiosensitivity using parameters like D(o), Dq, alpha/beta, and SF2.
  • Investigated in vitro radiosensitivity of SCC-7 cells with and without IL-1 alpha treatment.
  • Utilized superoxide dismutase and catalase to explore the role of oxidative stress.

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Main Results:

  • IL-1 alpha induced transient radioresistance in vivo, similar to hypoxia, with synergistic effects when combined with tirapazamine.
  • In vitro, IL-1 alpha did not directly alter SCC-7 cell radiosensitivity under aerobic conditions.
  • IL-1 alpha treatment of primary cultures increased radioresistance, which was abrogated by superoxide dismutase and catalase, suggesting a role for oxidative stress.

Conclusions:

  • IL-1 alpha-induced radioresistance in vivo appears linked to hypoxia, while in vitro mechanisms may involve oxidative stress from tumor macrophages.
  • The distinct mechanisms of IL-1 alpha's modulation of tumor radiosensitivity in vivo and in vitro warrant further investigation for therapeutic applications.