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Published on: March 23, 2011
Hippocampal M1 receptor function associated with spatial learning and memory in aged female rhesus macaques
Gwendolen E Haley1, Chris Kroenke, Daniel Schwartz
1Division of Neuroscience, Oregon National Primate Research Center, Beaverton, OR 97006, USA.
Age (Dordrecht, Netherlands)
|October 5, 2010
Summary
Aging affects acetylcholine muscarinic receptors (M1 and M2) in primate brains. Hippocampal M1 receptor function, not M2, correlates with spatial memory and circadian activity in aged females.
Area of Science:
- Neuroscience
- Aging Research
- Pharmacology
Background:
- Acetylcholine muscarinic receptors, specifically M1 and M2, are crucial for cognitive functions in the prefrontal cortex (PFC) and hippocampus.
- Previous research on age-related changes in these receptors in nonhuman primates yielded inconsistent results.
Purpose of the Study:
- To investigate age-related changes in M1 and M2 receptor binding in the PFC and hippocampus.
- To determine the association between M1/M2 receptor function and cognitive performance in elderly female rhesus macaques.
Main Methods:
- Saturation binding assays were used to assess age-related changes in M1 and M2 receptor binding.
- Pharmacological magnetic resonance imaging (fMRI) with scopolamine challenge and in vitro binding assays were employed to evaluate muscarinic function in relation to spatial performance.
Main Results:
- Maximum M1 receptor binding decreased with age, while M2 receptor binding affinity increased.
- Good spatial performers (GSP) exhibited greater hippocampal M1 receptor binding and affinity compared to poor spatial performers (PSP).
- Hippocampal M1 receptor function, but not M2, correlated positively with spatial learning, memory, and circadian activity parameters.
Conclusions:
- Age-related alterations in M1 and M2 receptor binding occur in the primate PFC and hippocampus.
- Hippocampal M1 receptor function is linked to cognitive abilities and circadian rhythms in aged female macaques, suggesting a potential therapeutic target for age-related cognitive decline.
