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Research Articles, Systems/Circuits

Electrical Coupling of Heterotypic Ganglion Cells in the Mammalian Retina

Christian Puller, Sabrina Duda, Elaheh Lotfi, Yousef Arzhangnia, Christoph T. Block, Malte T. Ahlers and Martin Greschner
Journal of Neuroscience 5 February 2020, 40 (6) 1302-1310; DOI: https://doi.org/10.1523/JNEUROSCI.1374-19.2019
Christian Puller
Department of Neuroscience and Research Centre Neurosensory Science, Carl von Ossietzky University, 26111 Oldenburg, Germany
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Sabrina Duda
Department of Neuroscience and Research Centre Neurosensory Science, Carl von Ossietzky University, 26111 Oldenburg, Germany
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Elaheh Lotfi
Department of Neuroscience and Research Centre Neurosensory Science, Carl von Ossietzky University, 26111 Oldenburg, Germany
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Yousef Arzhangnia
Department of Neuroscience and Research Centre Neurosensory Science, Carl von Ossietzky University, 26111 Oldenburg, Germany
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Christoph T. Block
Department of Neuroscience and Research Centre Neurosensory Science, Carl von Ossietzky University, 26111 Oldenburg, Germany
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Malte T. Ahlers
Department of Neuroscience and Research Centre Neurosensory Science, Carl von Ossietzky University, 26111 Oldenburg, Germany
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Martin Greschner
Department of Neuroscience and Research Centre Neurosensory Science, Carl von Ossietzky University, 26111 Oldenburg, Germany
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Abstract

Electrical coupling has been reported to occur only between homotypic retinal ganglion cells, in line with the concept of parallel processing in the early visual system. Here, however, we show reciprocal correlated firing between heterotypic ganglion cells in multielectrode array recordings during light stimulation in retinas of adult guinea pigs of either sex. Heterotypic coupling was further confirmed via tracer spread after intracellular injections of single cells with neurobiotin. Both electrically coupled cell types were sustained ON center ganglion cells but showed distinct light response properties and receptive field sizes. We identified one of the involved cell types as sustained ON α-ganglion cells. The presence of electrical coupling between heterotypic ganglion cells introduces a network motif in which the signals of distinct ganglion cell types are partially mixed at the output stage of the retina.

SIGNIFICANCE STATEMENT The visual information is split into parallel pathways, before it is sent to the brain via the output neurons of the retina, the ganglion cells. Ganglion cells can form electrical synapses between dendrites of neighboring cells in support of lateral information exchange. To date, ganglion-to-ganglion cell coupling is thought to occur only between cells of the same type. Here, however, we show that electrical coupling between different types of ganglion cells exists in the mammalian retina. We provide functional and anatomical evidence that two different types of ganglion cells share information via electrical coupling. This new network motif extends the impact of the heavily studied coding benefits of homotypic coupling to heterotypic coupling across parallel neuronal pathways.

  • ganglion cell
  • gap junction
  • multielectrode array
  • reciprocal signaling
  • retina
  • tracer coupling
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The Journal of Neuroscience: 40 (6)
Journal of Neuroscience
Vol. 40, Issue 6
5 Feb 2020
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Electrical Coupling of Heterotypic Ganglion Cells in the Mammalian Retina
Christian Puller, Sabrina Duda, Elaheh Lotfi, Yousef Arzhangnia, Christoph T. Block, Malte T. Ahlers, Martin Greschner
Journal of Neuroscience 5 February 2020, 40 (6) 1302-1310; DOI: 10.1523/JNEUROSCI.1374-19.2019

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Electrical Coupling of Heterotypic Ganglion Cells in the Mammalian Retina
Christian Puller, Sabrina Duda, Elaheh Lotfi, Yousef Arzhangnia, Christoph T. Block, Malte T. Ahlers, Martin Greschner
Journal of Neuroscience 5 February 2020, 40 (6) 1302-1310; DOI: 10.1523/JNEUROSCI.1374-19.2019
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Keywords

  • ganglion cell
  • gap junction
  • multielectrode array
  • reciprocal signaling
  • retina
  • tracer coupling

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