PMID: 9182254Feb 1, 1996Paper

High levels of extracellular glutamate are present in retina during neonatal development

Neurochemical Research
M F Haberecht, D A Redburn

Abstract

The three major classes of neurons which comprise the primary visual pathway in retina are glutamatergic. These cells are generated in two separate developmental stages, with one subclass of photoreceptors (cones) and ganglion cells generated before birth; and the other subclass of photoreceptors (rods) and bipolar cells generated during the first week after birth. Gas chromatography/mass spectroscopy analysis coupled with a new method for collecting small samples of extracellular fluids from retina were used to determine the levels of endogenous glutamate present during differentiation and synaptogenesis of these different cell types. As expected the total retinal content of glutamate increased during the postnatal period in synchrony with the generation and maturation of glutamatergic cells. However, a significant proportion of the endogenous pool was found extracellularly at birth. Intracellular glutamate is localized within cell bodies and growing processes of cones and ganglion cells at this time but few glutamatergic synapses are present. The extracellular concentration of glutamate actually declined during the most active period of synaptogenesis, reaching very low levels in the adult. The high concentrations of extracel...Continue Reading

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Citations

Feb 15, 1997·Journal of Neuroscience Research·M F HaberechtD A Redburn
Feb 9, 2006·Journal of Neural Transmission·T ZarnowskiW A Turski
Apr 7, 2000·Brain Research. Brain Research Reviews·R Linden
Nov 6, 2003·Vision Research·Robert RejdakKonrad Kohler
Nov 14, 2012·Developmental Neuroscience·Fredrik GhoshKarin Arnér
Dec 21, 2006·The Journal of Comparative Neurology·Monica L AcostaMichael Kalloniatis
Feb 24, 2012·Pharmacological Reports : PR·Robert RejdakEberhart Zrenner

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