Abstract:
:A significant decline in executive system function mediated by the prefrontal cortex (PFC) often occurs with normal aging. In vitro slice studies have shown that layer 2/3 pyramidal cells in the monkey PFC exhibit increased action potential (AP) firing rates which may, in part, contribute to this decline. Given that layer 5 cells also play a role in executive system function, it is important to determine if similar age-related changes occur in these cells. Whole-cell patch-clamp recordings in in vitro slices prepared from the PFC of young and aged behaviorally characterized rhesus monkeys were employed to answer this question. Basic membrane and repetitive AP firing properties were unaltered with age. Aged cells exhibited significantly decreased single AP amplitude, duration and fall time and increased slow afterhyperpolarization (sAHP) amplitude, but these changes were not associated with cognitive performance. This study demonstrates that layer 5 pyramidal cells, unlike layer 2/3 pyramidal cells, undergo only modest electrophysiological changes with aging, and that these changes are unlikely to contribute to age-related cognitive decline.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Luebke JI,Chang YMdoi
10.1016/j.neuroscience.2007.09.042subject
Has Abstractpub_date
2007-12-12 00:00:00pages
556-62issue
3eissn
0306-4522issn
1873-7544pii
S0306-4522(07)01185-2journal_volume
150pub_type
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