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Pull-Push Neuromodulation of Cortical Plasticity Enables Rapid Bi-Directional Shifts in Ocular Dominance

Su Z. Hong, Shiyong Huang, Daniel Severin, Alfredo Kirkwood
doi: https://doi.org/10.1101/2019.12.13.875849
Su Z. Hong
1Mind/Brain Institute, Johns Hopkins University, Baltimore, Maryland, USA
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Shiyong Huang
1Mind/Brain Institute, Johns Hopkins University, Baltimore, Maryland, USA
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Daniel Severin
1Mind/Brain Institute, Johns Hopkins University, Baltimore, Maryland, USA
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Alfredo Kirkwood
1Mind/Brain Institute, Johns Hopkins University, Baltimore, Maryland, USA
2Department of Neuroscience, Johns Hopkins University, Baltimore, Maryland, USA
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  • For correspondence: kirkwood@jhu.edu
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SUMMARY

Neuromodulatory systems are essential for remodeling glutamatergic connectivity during experience-dependent cortical plasticity. This permissive/enabling function of neuromodulators has been associated with their capacity to facilitate the induction of Hebbian forms of long-term potentiation (LTP) and depression (LTD) by affecting cellular and network excitability. In vitro studies indicate that neuromodulators can also affect the expression of Hebbian plasticity in a pull-push manner: receptors coupled to the G-protein Gs promote the expression of LTP at the expense of LTD, and Gq-coupled receptors promote LTD at the expense of LTD. Here we show that the pull-push mechanism can be recruited in vivo by pairing brief monocular stimulation with pharmacological or chemogenetical activation of Gs- or Gq-coupled receptors to respectively enhance or reduce visual cortical responses. These changes were stable, can be induced in adults after the termination of the critical period for juvenile ocular dominance plasticity, and can rescue deficits induced by prolonged monocular deprivation.

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Posted December 13, 2019.
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Pull-Push Neuromodulation of Cortical Plasticity Enables Rapid Bi-Directional Shifts in Ocular Dominance
Su Z. Hong, Shiyong Huang, Daniel Severin, Alfredo Kirkwood
bioRxiv 2019.12.13.875849; doi: https://doi.org/10.1101/2019.12.13.875849
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Pull-Push Neuromodulation of Cortical Plasticity Enables Rapid Bi-Directional Shifts in Ocular Dominance
Su Z. Hong, Shiyong Huang, Daniel Severin, Alfredo Kirkwood
bioRxiv 2019.12.13.875849; doi: https://doi.org/10.1101/2019.12.13.875849

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