VEGF-C promotes survival in podocytes

American Journal of Physiology. Renal Physiology
R R FosterSteven J Harper

Abstract

Vascular endothelial growth factor (VEGF)-A is an autocrine survival factor for podocytes, which express two VEGF receptors, VEGF-R1 and VEGF-R3. As VEGF-A is not a known ligand for VEGF-R3, the aim of this investigation was to examine whether VEGF-C, a known ligand for VEGF-R3, served a function in podocyte biology and whether this was VEGF-R3 dependent. VEGF-C protein expression was localized to podocytes in contrast to VEGF-D, which was expressed in parietal epithelial cells. Intracellular calcium ([Ca2+]i) experiments demonstrated that VEGF-C induced a 0.74+/-0.09-fold reduction in [Ca2+]i compared with baseline in human conditionally immortalized podocytes (hCIPs; P<0.05, one sample t-test, n=8). Cytotoxicity experiments revealed that in hCIPs VEGF-C reduced cytotoxicity to 81.4+/-1.9% of serum-starved conditions (P<0.001, paired t-test, n=16), similar to VEGF-A (82.8+/-4.5% of serum-starved conditions, P<0.05, paired t-test). MAZ51 (a VEGF-R3 kinase inhibitor) inhibited the VEGF-C-induced reduction in cytotoxicity (106.2+/-2.1% of serum-starved conditions), whereas MAZ51 by itself had no cytotoxic effects on hCIPs. VEGF-C was also shown to induce a 0.5+/-0.13-fold reduction in levels of MAPK phosphorylation compared with ...Continue Reading

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