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Plasticity in the barrel cortex of the adult mouse: Effects of peripheral deprivation on GAD-immunoreactivity

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Summary

The whisker-to-barrel pathway of the adult mouse was used in a study on the effects of peripheral sensory deprivation on GAD-immunoreactivity in the somatosensory cortex. At varying periods of time after removal of a set of vibrissal follicles, mice were processed for immunohistochemistry using an antibody against GAD. In sections tangential to the cortical surface we observed, in the barrels whose follicles were removed, decreased immunoreactivity as early as three days after surgery. The decrease was due to a lesser numerical density of stained puncta and to less intense staining of those remaining. GAD-positive somata were also less intensely stained, whereas their number did not seem to be changed. The changes, apparent at 3 days after the surgery, were restricted to the barrels corresponding to the removed follicles and were maximal at 2–4 weeks. At longer survival times (until 7 months) the immunoreactivity returned to normal, coincident with the regeneration of peripheral nerve fibres in the absence of their follicles. We conclude that GAD-immunoreactivity in the barrel cortex swiftly reacts to modifications of neuronal activity evoked in the periphery.

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Authors and Affiliations

  1. Institute of Anatomy, University of Lausanne, Rue du Bugnon 9, CH-1005, Lausanne, Switzerland

    E. Welker & H. Van der Loos

  2. Unitat de Biologia Celular, Facultat de Biologia, Universitat de Barcelona, E-08071, Barcelona, Spain

    E. Soriano

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  1. E. Welker
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  2. E. Soriano
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  3. H. Van der Loos
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Welker, E., Soriano, E. & Van der Loos, H. Plasticity in the barrel cortex of the adult mouse: Effects of peripheral deprivation on GAD-immunoreactivity. Exp Brain Res 74, 441–452 (1989). https://doi.org/10.1007/BF00247346

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  • DOI: https://doi.org/10.1007/BF00247346

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