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Blood, 15 May 2008, Vol. 111, No. 10, pp. 4997-5007.
Prepublished online as a Blood First Edition Paper on March 12, 2008; DOI 10.1182/blood-2007-08-108597.


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HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY

TNF primes endothelial cells for angiogenic sprouting by inducing a tip cell phenotype

Richard C. A. Sainson1, Douglas A. Johnston1, Henry C. Chu1, Matthew T. Holderfield1, Martin N. Nakatsu1, Steven P. Crampton1, Jaeger Davis1, Erin Conn1, and Christopher C. W. Hughes1

1 Department of Molecular Biology and Biochemistry, University of California, Irvine

Pathological angiogenesis associated with wound healing often occurs subsequent to an inflammatory response that includes the secretion of cytokines such as tumor necrosis factor (TNF). Controversy exists on the angiogenic actions of TNF, with it being generally proangiogenic in vivo, but antiangiogenic in vitro. We find that whereas continuous administration of TNF in vitro or in vivo inhibits angiogenic sprouting, a 2- to 3-day pulse stimulates angiogenesis by inducing an endothelial "tip cell" phenotype. TNF induces the known tip cell genes platelet-derived growth factor B (PDGFB) and vascular endothelial cell growth factor receptor-2 (VEGFR2), while at the same time blocking signaling through VEGFR2, thus delaying the VEGF-driven angiogenic response. Notch signaling regulates tip cell function, and we find that TNF also induces the notch ligand jagged-1, through an NF{kappa}B-dependent mechanism. Enrichment of jagged-1 in tip cells was confirmed by immunofluorescent staining as well as by laser capture microdissection/quantitative reverse-transcription–polymerase chain reaction (qRT-PCR) of tip cells sprouting in vitro. Thus, in angiogenesis, the temporal expression of TNF is critical: it delays angiogenesis initially by blocking signaling through VEGFR2, but in addition by inducing a tip cell phenotype through an NF{kappa}B-dependent pathway, it concomitantly primes endothelial cells (ECs) for sprouting once the initial inflammatory wave has passed.


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