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A tale of two neurotransmitters
1Department of Neurobiology and Anatomy,McGovern Medical School,University of Texas Health Science Center at Houston,Houston,TX 77225.
Visual Neuroscience
|April 1, 2017
Summary
Certain amacrine cells in the retina release both inhibitory glycine and excitatory glutamate. This dual neurotransmitter release suggests complex signaling roles for these retinal neurons.
Area of Science:
- Neuroscience
- Retinal circuitry
- Neurotransmission
Background:
- Amacrine cells are diverse local interneurons in the inner retina.
- They primarily release inhibitory neurotransmitters like GABA or glycine.
- Some amacrine cells exhibit more complex signaling beyond simple inhibition.
Purpose of the Study:
- To review amacrine cells that release both glycine and glutamate.
- To focus on the function and characteristics of these dual-transmitter amacrine cells.
- To explore their synaptic connections and postsynaptic densities.
Main Methods:
- Review of existing literature on amacrine cell function.
- Analysis of synaptic properties, including postsynaptic densities.
- Identification of amacrine cells expressing vesicular glutamate transporter 3 (VGLUT3).
Main Results:
- A specific type of amacrine cell releases glycine at some synapses and glutamate at others.
- Glutamatergic synapses exhibit asymmetric postsynaptic densities, characteristic of excitatory connections.
- Glycinergic synapses show symmetric postsynaptic densities, typical of inhibitory connections.
- These dual-transmitter amacrine cells target specific retinal ganglion cells and other amacrine cells.
Conclusions:
- Amacrine cells expressing VGLUT3 play a dual role in retinal signaling.
- Their ability to release both inhibitory and excitatory neurotransmitters allows for complex modulation of retinal output.
- Understanding these cells is crucial for deciphering intricate retinal processing.