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      Glomerular-specific alterations of VEGF-A expression lead to distinct congenital and acquired renal diseases.

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          Abstract

          Kidney disease affects over 20 million people in the United States alone. Although the causes of renal failure are diverse, the glomerular filtration barrier is often the target of injury. Dysregulation of VEGF expression within the glomerulus has been demonstrated in a wide range of primary and acquired renal diseases, although the significance of these changes is unknown. In the glomerulus, VEGF-A is highly expressed in podocytes that make up a major portion of the barrier between the blood and urinary spaces. In this paper, we show that glomerular-selective deletion or overexpression of VEGF-A leads to glomerular disease in mice. Podocyte-specific heterozygosity for VEGF-A resulted in renal disease by 2.5 weeks of age, characterized by proteinuria and endotheliosis, the renal lesion seen in preeclampsia. Homozygous deletion of VEGF-A in glomeruli resulted in perinatal lethality. Mutant kidneys failed to develop a filtration barrier due to defects in endothelial cell migration, differentiation, and survival. In contrast, podocyte-specific overexpression of the VEGF-164 isoform led to a striking collapsing glomerulopathy, the lesion seen in HIV-associated nephropathy. Our data demonstrate that tight regulation of VEGF-A signaling is critical for establishment and maintenance of the glomerular filtration barrier and strongly supports a pivotal role for VEGF-A in renal disease.

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          Author and article information

          Journal
          J Clin Invest
          The Journal of clinical investigation
          American Society for Clinical Investigation
          0021-9738
          0021-9738
          Mar 2003
          : 111
          : 5
          Affiliations
          [1 ] The Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada.
          Article
          10.1172/JCI17423
          151905
          12618525
          0599d4d0-8939-4fe0-8cf3-b02b9d80d6be
          History

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