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Summary: Acetylcholine helps muscarinic M1 receptors in the prefrontal cortex to maintain information in working memory. As acetylcholine actions at M1 receptors are reduced in conditions which affect working memory, such as schizophrenia and Alzheimer’s disease, researchers report the M1 receptor may serve as a potential therapeutic target to restore working memory.
Working memory, the ability to hold a thought in mind even through distraction, is the foundation of abstract reasoning and a defining characteristic of the human brain. It is also impaired in disorders such as schizophrenia and Alzheimer’s disease.
Now Yale researchers have found a key molecule that helps neurons maintain information in working memory, which could lead to potential treatments for neurocognitive disorders, they report March 19 in the journal Neuron.
“Working memory arises from neuronal circuits in the prefrontal cortex,” said senior author Min Wang, senior research scientist in neuroscience. “We have been learning that these circuits have special molecular maintenance requirements.”
Neurons in the prefrontal cortex excite each other to keep information “in mind.” These circuits act as a sort of mental sketch pad, allowing us to remember that caramelized onions are cooking in the frying pan while we search the next room for a pair of scissors.
The new study shows that these prefrontal cortical circuits depend upon the neurotransmitter acetylcholine stimulating muscarinic M1 receptors aligned on the surface of neurons of the prefrontal cortex. Blocking muscarinic M1 receptors reduced the firing of neurons involved in working memory, while activating the M1 receptors helped restore neuronal firing. Because acetylcholine actions at M1 receptors are reduced in schizophrenia and Alzheimer’s disease, the M1 receptor may serve as a potential therapeutic target, the authors suggest.
Wang notes that a drug currently under development for the treatment of schizophrenia stimulates this M1 receptor and has shown promise in early clinical trials.
Funding: Yale’s Veronica Galvin is first author of the paper, which was primarily funded by the National Institutes of Health.
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Source: Yale Media Contacts: Bess Connolly – Yale Image Source: The image is in the public domain.
Original Research: The study will appear in Neuron.
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