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Basic Sciences

Effects of Irradiation on the Release of Growth Factors from Cultured Bovine, Porcine, and Human Endothelial Cells

Larry Witte, Zvi Fuks, Adriana Haimovitz-Friedman, Israel Vlodavsky, DeWitt S. Goodman and Amiram Eldor
Larry Witte
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Zvi Fuks
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Adriana Haimovitz-Friedman
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Israel Vlodavsky
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DeWitt S. Goodman
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Amiram Eldor
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DOI:  Published September 1989
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Abstract

The effects of radiation on the release of mitogenic factors into the media of cultured endothelial cells of bovine, porcine, and human origins were studied. Although unirradiated controls revealed a significant background activity, single doses of irradiation (20–60 Gy) resulted in a dose-related increased release of growth factor activity, measured by the mitogenic effects of the conditioned media on both 3T3 mouse fibroblasts and unirradiated endothelial cells serving as target cells. Receptor binding competition assays for the platelet-derived growth factor receptor revealed that 12–28% of the total mitogenic activity was due to platelet-derived growth factor-like mitogens. Mitogenic assays using endothelial cells and specific antibody mediated inhibition assays suggested that another component of the mitogenic activity was due to a fibroblast growth factor-like factor. Although radiation resulted in a significant increase in cell death, the enhanced growth factor activities did not appear to result from cell lysis-related leakage of intracellular stores of growth factors. Instead, our data suggest that the growth factors were synthesized de novo and secreted at elevated levels by the cells which maintained postradiation a high level of metabolic activity. Time course studies demonstrated that the growth factors accumulation in the conditioned media started within the first 24 h after radiation and reached a plateau within 72 h after treatment. Radiation-induced release of endothelial cell-derived growth factors may be involved in the pathogenesis of both early vascular damage and the late fibrosis which represents a promiment feature of late radiation damage in normal tissues.

Footnotes

  • ↵1 Supported by NIH Grant HL 21006 (SCOR in Arteriosclerosis) (L. D. W., D. S. G.), American Heart Grants 84-1037 and 84-150 (L. D. W.), by the Israel Atomic Energy Commission and the Council for Higher Education of Israel (A. E., I. V), and NIH Grant CA-30289 (I. V.).

  • ↵2 To whom requests for reprints should be addressed, at Department of Medicine, Columbia University, College of Physicians & Surgeons, 630 West 168th Street, New York, NY 10032.

  • Received June 22, 1987.
  • Revision received February 2, 1988.
  • Revision received May 2, 1989.
  • Accepted June 7, 1989.
  • ©1989 American Association for Cancer Research.
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September 1989
Volume 49, Issue 18
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Effects of Irradiation on the Release of Growth Factors from Cultured Bovine, Porcine, and Human Endothelial Cells
Larry Witte, Zvi Fuks, Adriana Haimovitz-Friedman, Israel Vlodavsky, DeWitt S. Goodman and Amiram Eldor
Cancer Res September 15 1989 (49) (18) 5066-5072;

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Effects of Irradiation on the Release of Growth Factors from Cultured Bovine, Porcine, and Human Endothelial Cells
Larry Witte, Zvi Fuks, Adriana Haimovitz-Friedman, Israel Vlodavsky, DeWitt S. Goodman and Amiram Eldor
Cancer Res September 15 1989 (49) (18) 5066-5072;
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