Calvin Kuo

Publication Details

  • VEGF modulates erythropoiesis through regulation of adult hepatic erythropoietin synthesis NATURE MEDICINE Tam, B. Y., Wei, K., Rudge, J. S., Hoffman, J., Holash, J., Park, S., Yuan, J., Hefner, C., Chartier, C., Lee, J., Jiang, S., Niyak, N. R., Kuypers, F. A., Ma, L., Sundram, U., Wu, G., Garcia, J. A., Schrier, S. L., Maher, J. J., Johnson, R. S., Yancopoulos, G. D., Mulligan, R. C., Kuo, C. J. 2006; 12 (7): 793-800

    Abstract:

    Vascular endothelial growth factor (VEGF) exerts crucial functions during pathological angiogenesis and normal physiology. We observed increased hematocrit (60-75%) after high-grade inhibition of VEGF by diverse methods, including adenoviral expression of soluble VEGF receptor (VEGFR) ectodomains, recombinant VEGF Trap protein and the VEGFR2-selective antibody DC101. Increased production of red blood cells (erythrocytosis) occurred in both mouse and primate models, and was associated with near-complete neutralization of VEGF corneal micropocket angiogenesis. High-grade inhibition of VEGF induced hepatic synthesis of erythropoietin (Epo, encoded by Epo) >40-fold through a HIF-1alpha-independent mechanism, in parallel with suppression of renal Epo mRNA. Studies using hepatocyte-specific deletion of the Vegfa gene and hepatocyte-endothelial cell cocultures indicated that blockade of VEGF induced hepatic Epo by interfering with homeostatic VEGFR2-dependent paracrine signaling involving interactions between hepatocytes and endothelial cells. These data indicate that VEGF is a previously unsuspected negative regulator of hepatic Epo synthesis and erythropoiesis and suggest that levels of Epo and erythrocytosis could represent noninvasive surrogate markers for stringent blockade of VEGF in vivo.

    View details for DOI 10.1038/nm1428

    View details for Web of Science ID 000238862800066

    View details for PubMedID 16799557

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