Inhibition of Angiogenesis In Vivo by Interleukin 12 (original) (raw)

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Departments of Surgery and Cell Biology, Harvard Medical School

Boston, Mass

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Departments of Surgery and Cell Biology, Harvard Medical School

Boston, Mass

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Departments of Surgery and Cell Biology, Harvard Medical School

Boston, Mass

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Department of Oncology, Hoffmann-La Roche Inc.

Nutley, NJ

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Departments of Surgery and Cell Biology, Harvard Medical School

Boston, Mass

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Departments of Surgery and Cell Biology, Harvard Medical School

Boston, Mass

Judah Folkman, M.D., Children's Hospital, Hunnewell 103, 300 Longwood Ave., Boston, MA 02115.

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Emile E. Voest, Bärbel M. Kenyon, Michael S. O'Reilly, Gary Truitt, Robert J. D'Amato, Judah Folkman, Inhibition of Angiogenesis In Vivo by Interleukin 12, JNCI: Journal of the National Cancer Institute, Volume 87, Issue 8, 19 April 1995, Pages 581–586, https://doi.org/10.1093/jnci/87.8.581
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Abstract

Background : In previous animal studies, interleukin 12 (IL 12) was shown to inhibit the growth of a wide spectrum of tumors in vivo but to have no direct effect on tumor cells in vitro. Also, contrary to the expectation of a T-cell-mediated effect, the antitumor activity of IL 12 was not completely abrogated in tests of T-cell-deficient mice. These observations suggest that IL 12 may possess antiangiogenic properties that account for its tumor-inhibitory effects in vivo. Purpose: Our goal was to investigate the hypothesis that IL 12 has antiangiogenic properties. Methods: A model of basic fibroblast growth factor-induced corneal neovascularization in mice was used to evaluate the effects of IL 12 and interferon gamma (IFN γ) on angiogenesis in vivo. Different strains of male mice, e.g., immunocompetent C57BL/6 mice, severe combined immune-deficient (SCID) mice, natural killer cell-deficient beige mice, and T-cell-deficient nude mice, were treated with IL 12 (1 μg/day) intraperitoneally for 5 consecutive days. The extent of neovascularization in response to a basic fibroblast growth factor pellet and the inhibition of neovascularization by IL 12 or IFN γ were assessed by measuring the maximal vessel length and the corneal circumference involved in new blood vessel formation. The antitumor activities of IL 12 and of the angiogenesis inhibitor AGM-1470 were evaluated in Lewis lung carcinomabearing mice. In vitro proliferation studies were performed on bovine capillary endothelial cells, mouse pancreatic islet endothelial cells, and mouse hemangioendothelioma cells. Results : IL 12 treatment almost completely inhibited corneal neovascularization in C57BL/6, SCID, and beige mice. This potent suppression of angiogenesis was prevented by the administration of IFN γ-neutralizing antibodies, suggesting that the suppression was mediated through IFN γ. In addition, the administration of IFN γ reproduced the antiangiogenic effects observed during treatment with IL 12. Treatment with IL 12 and AGM-1470 combined did not increase toxicity and showed a trend toward enhanced antitumor efficacy in Lewis lung carcinoma-bearing mice. Conclusions : IL 12 strongly inhibits neovascularization. This effect is not mediated by a specific cell type of the immune system. Instead, IL 12 has been shown to induce IFN γ, which, in turn, appears to play a critical role as a mediator of the antiangiogenic effects of IL 12. Implications : Recognition of the mechanisms of the antiangiogenic properties of IL 12 may be crucial in planning its clinical applications, including a possibility of coadministration with other inhibitors of neovascularization. [J Natl Cancer Inst 87:581–586, 1995]

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Topic:

• angiogenesis
• endothelial cells
• lung
• cancer
• carcinoma
• fibroblasts
• angiogenesis inhibitors
• cattle
• corneal neovascularization
• fibroblast growth factor 2
• hemangioendothelioma
• immune system
• immunocompetence
• interferon type ii
• recombinant interferon-gamma
• interleukin-12
• endocrine pancreas
• mice, inbred c57bl
• mice, nude
• neovascularization, pathologic
• severe combined immunodeficiency
• antibodies
• blood capillaries
• cornea
• mice
• neoplasms
• tumor cells
• toxic effect
• animal testing

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