IL-12 suppresses vascular endothelial growth factor receptor 3 expression on tumor vessels by two distinct IFN-gamma-dependent mechanisms.

IL-12 suppresses vascular endothelial growth factor receptor 3 expression on tumor vessels by two distinct IFN-gamma-dependent mechanisms.
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DOI:
10.4049/jimmunol.0903210
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发表时间:
2010-02-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Lord EM
Lord EM
中科院分区:
其他
文献类型:
--
作者:
Sorensen EW;Gerber SA;Frelinger JG;Lord EM

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IL-12已被证明在增强抗肿瘤反应中是有效的。然而,IL-12如何发挥其抗血管生成作用在很大程度上是未知的。在这项研究中,我们阐明了这一机制,使用B16转染表达IL-12(B16/IL-12),一个系统,提供恒定的,局部生产的IL-12的肿瘤微环境。肿瘤内IL-12导致肿瘤生长和脉管系统表型变化的显著延迟。在B16肿瘤中发现的血管是混乱的,并且形成不良,并且表达血管内皮生长因子受体3(VEGFR 3),这是一种在正常成人血管上不表达的生长因子受体。然而,B16/IL-12肿瘤内的血管具有更正常的形态,并且不表达VEGFR 3。我们已经表明,IFN-γ是IL-12抑制VEGFR 3异常表达所必需的。事实上,与亲本B16肿瘤相比,瘤内IL-12的存在刺激免疫系统,导致每个肿瘤产生更多的产生IFN-γ的肿瘤浸润淋巴细胞,这可能对控制肿瘤生长具有显著作用。有趣的是,在B16/IL-12肿瘤中,T细胞是抑制肿瘤血管上VEGFR 3表达所必需的。最后,在骨髓嵌合体系统中使用IFN-γ受体敲除小鼠,我们表明肿瘤内产生的IFN-γ以两种方式抑制VEGFR 3表达:1)直接作用于肿瘤血管内皮细胞,2)作用于肿瘤浸润淋巴细胞以间接改变内皮细胞的VEGFR 3表达。我们的数据表明肿瘤浸润免疫细胞调节肿瘤血管表型的机制。
IL-12 has been shown to be effective in enhancing antitumor responses. However, how IL-12 exerts its antiangiogenic effect is largely unknown. In this study, we elucidate this mechanism using B16 transfected to express IL-12 (B16/IL-12), a system that provides constant, local production of IL-12 within the tumor microenvironment. Intratumoral IL-12 resulted in a significant delay in tumor growth and phenotypic changes in the vasculature. Vessels found within B16 tumors are chaotic and poorly formed and express vascular endothelial growth factor receptor 3 (VEGFR3), a growth factor receptor not expressed on normal adult vessels. However, the vessels within B16/IL-12 tumors have a more normal morphology and do not express VEGFR3. We have shown that IFN-γ is required for IL-12 to suppress the aberrant expression of VEGFR3. Indeed, the presence of intratumoral IL-12 stimulates the immune system resulting in more IFN-γ–producing tumor-infiltrating lymphocytes per tumor when compared with parental B16 tumors, which may have a marked effect on control of tumor growth. Interestingly, within B16/IL-12 tumors, T cells are necessary to suppress VEGFR3 expression on tumor vessels. Finally, using IFN-γ receptor knockout mice in a bone marrow chimera system, we show that the IFN-γ produced within the tumor suppresses VEGFR3 expression in two ways: 1) acting directly on tumor vessel endothelial cells, and 2) acting on the tumor-infiltrating lymphocytes to indirectly alter endothelial cells’ VEGFR3 expression. Our data indicate a mechanism in which tumor-infiltrating immune cells regulate tumor vessel phenotype.
DOI: 10.1084/jem.180.5.1715
发表时间: 1994-11-01
影响因子: 15.3
作者:
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发表时间: 1998-11-24
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