Abstract
The regional activity of phosphate-activated glutaminase (PAG) was assessed in 8-month-old and 28-month-old male Fischer-344 (F344) rats from the temporal cortex (TCX), striatum (STR) and hippocampus (HIPP). Basal activity, as represented by activity in the presence of 10 mM phosphate, was decreased 23% in the TCX from aged rats compared to adults while neither the STR or HIPP exhibited age-related changes. In the presence of 100 mM phosphate, which will maximally stimulate PAG activity, none of the regions displayed age-related changes although all groups showed increased PAG activity of 112–169% compared to corresponding values in the presence of 10 mM phosphate.
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