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Journal of Neuroscience, Vol 15, 4738-4747, Copyright © 1995 by Society for Neuroscience
Development of retinal vasculature is mediated by hypoxia-induced vascular endothelial growth factor (VEGF) expression by neuroglia
J Stone, A Itin, T Alon, J Pe'er, H Gnessin, T Chan-Ling and E Keshet
Department of Anatomy and Histology, University of Sydney, Australia.
We have studied the role of the hypoxia-inducible angiogenic growth factor
vascular endothelial growth factor (VEGF) in the induction and control of
vessel growth in the developing retina of rats and cats, using in situ
hybridization techniques. VEGF is expressed successively in two layers of
neural retina, the innermost (axon) layer and the inner nuclear layer
(INL). In the axon layer, VEGF is expressed transiently by astrocytes as
they spread across the layer, closely preceding the formation of
superficial vessels. In the INL, VEGF is expressed transiently by somas at
the middle of the layer (presumably Muller cells), closely preceding the
formation of the deep layer of retinal vessels. We propose that hypoxia
caused by the onset of neuronal activity is detected by strategically
located populations of neuroglia, first astrocytes, then Muller cells. In
response they secrete VEGF, inducing formation of the superficial and deep
layers of retinal vessels, respectively. As the vessels become patent, they
relieve the hypoxic stimulus, so vessel formation is matched to oxygen
demand. This hypothesis was tested experimentally in three ways. Expression
of the high affinity flk-1 receptor for VEGF was demonstrated in newly
formed retinal vessels, confirming that the secreted VEGF acts on the
vessels, in a paracrine fashion. Direct hypoxic regulation of VEGF
expression by macroglia was demonstrated in primary cultures of astrocytes
and in cells of a glioma line. Hypoxic regulation of VEGF expression in the
intact developing retina was demonstrated by showing that oxygen-enriched
atmospheres that inhibit vessel formation also suppress endogenous VEGF
production.
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