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Blood, Vol. 93 No. 6 (March 15), 1999:
pp. 1969-1979
Inflammatory Cytokines and Vascular Endothelial Growth
Factor Stimulate the Release of Soluble Tie Receptor From
Human Endothelial Cells Via Metalloprotease Activation
Rachel Yabkowitz,
Susanne Meyer,
Tabitha Black,
Gary Elliott,
Lee
Anne Merewether, and
Harvey K. Yamane
From the Departments of Mammalian Cell Molecular Biology,
Experimental Hematology, Protein Structure, and Protein Chemistry,
Amgen Inc, Thousand Oaks, CA.
Activation of endothelial cells, important in processes such as
angiogenesis, is regulated by cell surface receptors, including those
in the tyrosine kinase (RTK) family. Receptor activity, in turn, can be
modulated by phosphorylation, turnover, or proteolytic release of a
soluble extracellular domain. Previously, we demonstrated that release
of soluble tie-1 receptor from endothelial cells by phorbol myristate
acetate (PMA) is mediated through protein kinase
C and a Ca2+-dependent protease. In this
study, the release of soluble tie-1 was shown to be stimulated by
inflammatory cytokines and vascular endothelial growth factor
(VEGF), but not by growth factors such as basic fibroblast
growth factor (bFGF) or transforming growth factor
(TGF ). Release of soluble tie by tumor necrosis factor (TNF ) or VEGF occurred within 10 minutes of
stimulation and reached maximal levels within 60 minutes. Specificity
was shown by fluorescence-activated cell sorting (FACS) analysis;
endothelial cells exhibited a significant decrease in cell surface
tie-1 expression in response to TNF, whereas expression of epidermal
growth factor receptor (EGF-R) and CD31 was stable. In
contrast, tie-1 expression on megakaryoblastic UT-7 cells was
unaffected by PMA or TNF . Sequence analysis of the cleaved receptor
indicated that tie-1 was proteolyzed at the
E749/S750 peptide bond in the proximal
transmembrane domain. Moreover, the hydroxamic acid derivative BB-24
demonstrated dose-dependent inhibition of cytokine-, PMA-, and
VEGF-stimulated shedding, suggesting that the tie-1 protease was a
metalloprotease. Protease activity in a tie-1 peptide cleavage assay
was (1) associated with endothelial cell membranes, (2) specifically
activated in TNF -treated cells, and (3) inhibited by BB-24.
Additionally, proliferation of endothelial cells in response to VEGF,
but not bFGF, was inhibited by BB-24, suggesting that the release of
soluble tie-1 receptor plays a role in VEGF-mediated proliferation.
This study demonstrated that the release of soluble tie-1 from
endothelial cells is stimulated by inflammatory cytokines and VEGF
through the activation of an endothelial membrane-associated metalloprotease.

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