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. 1996 Jan 15;97(2):469–476. doi: 10.1172/JCI118437

Hypoxia-induced paracrine regulation of vascular endothelial growth factor receptor expression.

E Brogi 1, G Schatteman 1, T Wu 1, E A Kim 1, L Varticovski 1, B Keyt 1, J M Isner 1
PMCID: PMC507039  PMID: 8567969

Abstract

Vascular endothelial growth factor (VEGF)/vascular permeability factor (VPF), an endothelial cell (EC)-specific mitogen, stimulates angiogenesis in vivo, particularly in ischemic regions. VEGF/VPF expression by cells of hypoxic tissues coincides with expression of its two receptors, KDR and flt-1, by ECs in the same tissues. We investigated whether hypoxia or hypoxia-dependent conditions operate in coordinating this phenomenon. Human umbilical vein and microvascular ECs were exposed to direct hypoxia or to medium conditioned (CM) by myoblasts maintained in hypoxia for 4 d. Control ECs were maintained in normoxia or normoxia-CM. Binding of 125I-VEGF to ECs was then evaluated. Hypoxic treatment of ECs had no effect on 125I-VEGF binding. However, treatment of ECs with hypoxia-CM produced a threefold increase in 125I-VEGF binding, with peak at 24 h (P < 0.001, ANOVA). Scatchard analysis disclosed that increased binding was due to a 13-fold increase in KDR receptors/cell, with no change in KDR affinity (Kd = 260 +/- 51 pM, normoxia-CM versus Kd = 281 +/- 94 pM, hypoxia-CM) and no change in EC number (35.6 +/- 5.9 x 10(3) ECs/cm2, normoxia-CM versus 33.5 +/- 5.5 x 10(3) ECs/cm2, hypoxia-CM). Similar results were obtained using CM from hypoxic smooth muscle cells. KDR upregulation was not prevented by addition to the hypoxia-CM of neutralizing antibodies against VEGF, tumor necrosis factor-alpha, transforming growth factor beta 1 or basic fibroblast growth factor. Similarly, addition of VEGF or lactic acid to the normoxia-CM had no effect on VEGF binding. We conclude that mechanism(s) initiated by hypoxia can induce KDR receptor upregulation in ECs. Hypoxic cells, normal or neoplastic, not only can produce VEGF/VPF, but can also modulate its effects via paracrine induction of VEGF/VPF receptors in ECs.

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Selected References

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