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Division of Endocrinology, Veterans Affairs Medical Center, Long Beach, California 90822; and Departments of Medicine (A.P., M.R., E.R.L.) and Pharmacology (E.R.L.), University of California, Irvine, California 92717
Address all correspondence and requests for reprints to: Ellis R. Levin, M.D., Medical Service (11/111-I), Long Beach Veterans Affairs Medical Center, 5901 East 7th Street, Long Beach, California 90822. E-mail: ellis.levin{at}med.va.gov
Vascular endothelial cell growth factor (VEGF) is essential for angiogenesis. Atrial natriuretic peptide (ANP) inhibits the production of VEGF, but whether this important vascular peptide also inter- rupts VEGF signaling to angiogenesis is unknown. In cultured bovine aortic endothelial cells, VEGF significantly stimulated extracellular signal-regulated protein kinase activity and phosphorylation, which was inhibited 60% by coincubation with ANP or a natriuretic peptide clearance receptor specific ligand (NPRC), C-type NAP-(4–23) [C-ANP-(4–23)]. VEGF also stimulated c-Jun N-terminal kinase (JNK) and p38 activities/phosphorylation that were prevented by the two natriuretic peptides (NP). A specific NP guanylate cyclase (GC) receptor antagonist, HS-142–1, blocked the actions of ANP [but not those of C-ANP-(4–23)], supporting the involvement of both GC and NPRC receptors. VEGF and expression of constituitively active JNK each stimulated the synthesis of cyclin D1 and increased the activity of the cyclin-dependent kinase-4, which was inhibited 55% by ANP. VEGF induced endothelial cell proliferation and migration, which was significantly blocked by NP or by expressing a dominant negative JNK-1. VEGF stimulated human microvascular endothelial cells to form capillary tubes, which was significantly inhibited by expressing dominant negative JNK-1 and by NP. Therefore, VEGF induction of critical steps in angiogenesis is enhanced through JNK activation. The actions are significantly prevented by NP, which act through both the NPRC and GC receptors to block growth factor signaling. Thus, NP are candidate antiangiogenesis factors that inhibit both the synthesis and function of VEGF.
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