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Science 3 November 1989:
Vol. 246. no. 4930, pp. 673 - 675
DOI: 10.1126/science.2573152
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Articles

Science, Vol 246, Issue 4930, 673-675
Copyright © 1989 by American Association for the Advancement of Science

articles

A biochemical correlate of the critical period for synaptic modification in the visual cortex

SM Dudek and MF Bear

Center for Neural Science, Brown University, Providence, RI 02912.

Stimulation of phosphoinositide hydrolysis by excitatory amino acids was studied in synaptoneurosomes of kitten striate cortex at several postnatal ages. Ibotenate and glutamate stimulated phosphoinositide turnover during the second and third postnatal months; N-methyl-D-aspartate and DL-alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) were without effect. The developmental profile of ibotenate-stimulated phosphoinositide turnover parallels the postnatal changes in cortical susceptibility to visual deprivation. The transient increase in ibotenate-stimulated phosphoinositide turnover does not occur in visual cortex of kittens reared in complete darkness.


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