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Potentiation of cortical inhibition by visual deprivation

Nature volume 443, pages 81–84 (2006)Cite this article

Abstract

The fine-tuning of circuits in sensory cortex requires sensory experience during an early critical period. Visual deprivation during the critical period has catastrophic effects on visual function, including loss of visual responsiveness to the deprived eye1,2,3, reduced visual acuity4, and loss of tuning to many stimulus characteristics2,5. These changes occur faster than the remodelling of thalamocortical axons6, but the intracortical plasticity mechanisms that underlie them are incompletely understood. Long-term depression of excitatory intracortical synapses has been proposed as a general candidate mechanism for the loss of cortical responsiveness after visual deprivation7,8. Alternatively (or in addition), the decreased ability of the deprived eye to activate cortical neurons could be due to enhanced intracortical inhibition9,10. Here we show that visual deprivation leaves excitatory connections in layer 4 (the primary input layer to cortex) unaffected, but markedly potentiates inhibitory feedback between fast-spiking basket cells (FS cells) and star pyramidal neurons (star pyramids). Further, a previously undescribed form of long-term potentiation of inhibition (LTPi) could be induced at synapses from FS cells to star pyramids, and was occluded by previous visual deprivation. These data suggest that potentiation of inhibition is a major cellular mechanism underlying the deprivation-induced degradation of visual function, and that this form of LTPi is important in fine-tuning cortical circuitry in response to visual experience.

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Figure 1: VD between P18 and P21 has no effect on recurrent excitatory star pyramid connections.
Figure 2: VD potentiates feedback inhibition within layer 4.
Figure 3: VD suppresses spontaneous firing of star pyramids.
Figure 4: Inhibitory LTP at FS-cell to star-pyramid synapses is occluded by previous VD.

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Acknowledgements

We thank R. Pavlyuk for help with histology, and A. Fontanini for help with software and for discussions. This study was supported by the National Institutes of Health.

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Authors and Affiliations

  1. Department of Biology and Center for Behavioral Genomics, Brandeis University, Massachusetts, 02454, Waltham, USA

    Arianna Maffei, Kiran Nataraj, Sacha B. Nelson & Gina G. Turrigiano

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  1. Arianna Maffei
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Correspondence to Gina G. Turrigiano.

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Maffei, A., Nataraj, K., Nelson, S. et al. Potentiation of cortical inhibition by visual deprivation. Nature 443, 81–84 (2006). https://doi.org/10.1038/nature05079

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