Nitric oxide stimulates γ-aminobutyric acid release and inhibits glycine release in retina

Dou Yu, William D. Eldred*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


Nitric oxide (NO) modulates the uptake and/or release of neurotransmitters through a variety of cellular mechanisms. However, the pharmacological and biochemical processes underlying these neurochemical effects of NO often remain unclear. In our study, we used immunocytochemical methods to study the effects of NO, cyclic guanosine monophosphate (cGMP), and peroxynitrite on the uptake and release of γ-aminobutyric acid (GABA) and glycine in the turtle retina. In addition, we examined the involvement of glutamate receptors, calcium, and the GABA transporter in this GABA uptake and release. We also tested for interactions between the GABAergic and glycinergic systems. In general, we show that NO stimulated GABA release and inhibited glycine release. The NO-stimulated GABA release involved calcium-dependent or calcium-independent synaptic release or reversal of the GABA transporter. Some effects of NO on GABA release involved glutamate, cGMP, or peroxynitrite. NO promoted glycine uptake and inhibited its release, and this inhibition of glycine release was influenced by GABAergic modulation. These findings indicate that NO modulates the levels of the inhibitory transmitters GABA and glycine through several specific biochemical mechanisms in different retinal cell types and layers. Thus it appears that some of the previously described reciprocal interactions between GABA and glycine in the retina function through specific NO signaling pathways.

Original languageEnglish (US)
Pages (from-to)278-291
Number of pages14
JournalJournal of Comparative Neurology
Issue number3
StatePublished - Mar 14 2005


  • Modulation
  • Neurotransmitter
  • Release, uptake
  • Turtle

ASJC Scopus subject areas

  • General Neuroscience


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