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Two methods of catecholamine depletion in kitten visual cortex yield different effects on plasticity

Abstract

As first clearly demonstrated by the experiments of Wiesel and Hubel1, the developing visual cortex is exquisitely sensitive to sensory deprivation. Temporary closure of one eye of a kitten during a critical period that extends from 3 weeks to 3 months of age results in a dramatic cortical reorganization such that most neurones, originally binocularly driven, are dominated exclusively by the open eye. Recently, attention has been directed to chemical factors which may influence the degree of plasticity during the critical period. The work of Kasamatsu and Pettigrew2–6 suggests that cortical catecholamines, especially noradrenaline (NA), are essential for the normal plastic response to visual deprivation. In an effort to clarify the role of NA in visual cortical plasticity, we have monocularly deprived kittens whose cortex had been depleted of catecholamines by the neurotoxin 6-hydroxydopamine (6-OHDA)7–9. We used two strategies to deplete cortical NA: the first, pioneered by Kasamatsu et al.5, utilized osmotic minipumps to deliver 6-OHDA to visual cortex; the second involved systemic neonatal injections of 6-OHDA, a technique which has proved effective in rodents10–12. We found, using high-pressure liquid chromatography (HPLC), that both techniques produced a substantial reduction in the level of cortical NA. However, single unit recording in area 17 revealed that the plastic response to monocular deprivation (MD) was only diminished in the kittens depleted by minipump.

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Bear, M., Paradiso, M., Schwartz, M. et al. Two methods of catecholamine depletion in kitten visual cortex yield different effects on plasticity. Nature 302, 245–247 (1983). https://doi.org/10.1038/302245a0

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