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Am J Physiol Renal Physiol 271: F744-F753, 1996;
0363-6127/96 $5.00
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AJP - Renal Physiology, Vol 271, Issue 3 744-F753, Copyright © 1996 by American Physiological Society

ARTICLES

Evidence that embryonic kidney cells expressing flk-1 are intrinsic, vasculogenic angioblasts

B. Robert, P. L. St John, D. P. Hyink and D. R. Abrahamson
Department of Comparative Medicine, University of Alabama at Birmingham 35294-0019, USA.

Renal glomerular capillary tufts have been believed to arise from angiogenic ingrowth of extrinsic vessels. We found, however, that when embryonic day 12 (E12) mouse kidneys were maintained in culture for 6 days and then grafted into anterior eye chambers of adult transgenic ROSA26 host mice (which carry the beta-galactosidase transgene), glomerular endothelial cells within the grafts were predominantly of intrinsic, kidney origin. To identify potential endothelial precursors, we immunolabled kidneys with antibodies against the vascular endothelial growth factor receptor, flk-1. Numerous discrete cells expressing flk-1 were scattered throughout the nephrogenic mesenchyme of both E12 and newborn kidneys, and with development these cells became concentrated in microvessels, glomerular vascular clefts, and glomerular tufts. In adults, flk-1 was weakly expressed in glomeruli but absent elsewhere. To examine abilities of flk-1-positive cells to establish glomeruli, E12 kidneys were grafted into kidney cortices of adult and newborn ROSA26 hosts. Grafts into adults resulted in few glomeruli containing host-derived endothelium, whereas a majority of glomeruli grafted into newborns contained host cells. Cells of graft origin were found in vessels forming in renal cortices of newborn hosts, but not in adults. Our findings indicate that embryonic kidney cells expressing flk-1 are angioblasts that create microvessels and glomeruli by vasculogenesis.


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