Abstract:
:Interleukin-12 (IL-12) inhibits angiogenesis in vivo by inducing interferon-gamma (IFN-gamma) and other downstream mediators. Here, we report that neutralization of natural killer (NK) cell function with antibodies to either asialo GM1 or NK 1.1 reversed IL-12 inhibition of basic fibroblast growth factor (bFGF)-induced angiogenesis in athymic mice. By immunohistochemistry, those sites where bFGF-induced neovascularization was inhibited by IL-12 displayed accumulation of NK cells and the presence of IP-10-positive cells. Based on expression of the cytolytic mediators perforin and granzyme B, the NK cells were locally activated. Experimental Burkitt lymphomas treated locally with IL-12 displayed tumor tissue necrosis, vascular damage, and NK-cell infiltration surrounding small vessels. After activation in vitro with IL-12, NK cells from nude mice became strongly cytotoxic for primary cultures of syngeneic aortic endothelial cells. Cytotoxicity was neutralized by antibodies to IFN-gamma. These results document that NK cells are required mediators of angiogenesis inhibition by IL-12, and provide evidence that NK-cell cytotoxicity of endothelial cells is a potential mechanism by which IL-12 can suppress neovascularization.
journal_name
Bloodjournal_title
Bloodauthors
Yao L,Sgadari C,Furuke K,Bloom ET,Teruya-Feldstein J,Tosato Gsubject
Has Abstractpub_date
1999-03-01 00:00:00pages
1612-21issue
5eissn
0006-4971issn
1528-0020journal_volume
93pub_type
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