Abstract | BACKGROUND: METHODS: Functional NMDA channel activation was confirmed in both amacrine and ganglion cells by quantifying the entry into these neurones of a channel permeable probe ( agmatine: 1-amino-4-guanidobutane [AGB]). By probing serial thin sections with immunoglobulins targeting AGB, glutamate, gamma-aminobutyric acid ( GABA) and glycine, it was possible to simultaneously study the neurochemical characteristic as well as the NMDA-evoked AGB responses of different neurochemical populations of inner retinal neurones. RESULTS: The authors have previously shown no accumulation of glutamate or GABA within Muller cells following NMDA application. Herein they report altered GABA and glycine immunoreactivity, but not glutamate immunoreactivity within neurones of the amacrine and ganglion cell layers following NMDA application. Finally, the addition of betaxolol did not significantly alter the normal neurochemistry of the retina. CONCLUSION: The retina possesses intrinsic mechanisms that allow it to maintain metabolic integrity during short periods of high NMDA application.
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Authors | Daniel Sun, Michael Kalloniatis |
Journal | Clinical & experimental ophthalmology
(Clin Exp Ophthalmol)
Vol. 32
Issue 5
Pg. 505-17
(Oct 2004)
ISSN: 1442-6404 [Print] Australia |
PMID | 15498063
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Adrenergic beta-Antagonists
- Excitatory Amino Acid Agonists
- Receptors, N-Methyl-D-Aspartate
- Glutamic Acid
- gamma-Aminobutyric Acid
- N-Methylaspartate
- Agmatine
- Betaxolol
- Glycine
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Topics |
- Adrenergic beta-Antagonists
(pharmacology)
- Agmatine
(metabolism)
- Amacrine Cells
(cytology, metabolism)
- Animals
- Betaxolol
(pharmacology)
- Excitatory Amino Acid Agonists
(pharmacology)
- Glutamic Acid
(metabolism)
- Glycine
(metabolism)
- Immunohistochemistry
- N-Methylaspartate
(pharmacology)
- Neurons
(drug effects, metabolism)
- Rabbits
- Receptors, N-Methyl-D-Aspartate
(metabolism)
- Retina
(drug effects, metabolism)
- Retinal Ganglion Cells
(cytology, metabolism)
- gamma-Aminobutyric Acid
(metabolism)
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