Induction of podocyte-derived VEGF ameliorates podocyte injury and subsequent abnormal glomerular development caused by puromycin aminonucleoside.

Ma J, Matsusaka T, Yang HC, Zhong J, Takagi N, Fogo AB, Kon V, Ichikawa I
Pediatr Res. 2011 70 (1): 83-9

PMID: 21451433 · PMCID: PMC3113658 · DOI:10.1203/PDR.0b013e31821bdf1c

Our previous studies using puromycin aminonucleoside (PAN) established that podocyte damage leads to glomerular growth arrest during development and glomerulosclerosis later in life. This study examined the potential benefit of maintaining podocyte-derived VEGF in podocyte defense and survival after PAN injury using conditional transgenic podocytes and mice, in which human VEGF-A (hVEGF) transgene expression is controlled by tetracycline responsive element (TRE) promoter and reverse tetracycline transactivator (rtTA) in podocytes. In vitro experiments used primary cultured podocytes harvested from mice carrying podocin-rtTA and TRE-hVEGF transgenes, in which hVEGF can be induced selectively. Induction of VEGF in PAN-exposed podocytes resulted in preservation of intrinsic VEGF, α-actinin-4 and synaptopodin, antiapoptotic marker Bcl-xL/Bax, as well as attenuation in apoptotic marker cleaved/total caspase-3. In vivo, compared with genotype controls, PAN-sensitive neonatal mice with physiologically relevant levels of podocyte-derived VEGF showed significantly larger glomeruli. Furthermore, PAN-induced up-regulation of desmin, down-regulation of synaptopodin and nephrin, and disruption of glomerular morphology were significantly attenuated in VEGF-induced transgenic mice. Our data indicate that podocyte-derived VEGF provides self-preservation functions, which can rescue the cell after injury and preempt subsequent deterioration of the glomerulus in developing mice.

MeSH Terms (25)

Actinin Animals Animals, Newborn Apoptosis Autocrine Communication bcl-2-Associated X Protein bcl-X Protein Caspase 3 Cells, Cultured Desmin Disease Models, Animal Doxycycline Glomerulonephritis Humans Intracellular Signaling Peptides and Proteins Kidney Glomerulus Membrane Proteins Mice Mice, Inbred C57BL Mice, Transgenic Microfilament Proteins Podocytes Puromycin Aminonucleoside Response Elements Vascular Endothelial Growth Factor A

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