As a functional measure of NMDA receptor effectiveness in kitten striate cortex, the uptake of 45Ca by visual cortical slices was measured after 2 minute bath applications of N-methyl-D-aspartate (NMDA). Significant Ca uptake occurred in response to 12.5-100 microM NMDA in slices prepared from visual cortex of normal animals aged 28-48 days. Basal uptake (in the absence of NMDA) was increased and evoked uptake was decreased in visual cortical slices prepared from age-matched dark-reared animals. Four days of binocular deprivation in otherwise normally reared animals had no effect on basal uptake, but significantly lowered NMDA-evoked Ca uptake at agonist concentrations greater than 25 microM. These data suggest that even brief manipulations of sensory experience are sufficient to alter visual cortical calcium regulation.
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