Soulmate Gem
Soulmate Gem
Photo: Designecologist
“Since dreams are thought to primarily occur during REM sleep, the sleep stage when the MCH cells turn on, activation of these cells may prevent the content of a dream from being stored in the hippocampus – consequently, the dream is quickly forgotten.”
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Read More »In this study, Dr. Kilduff worked with Dr. Yamanaka’s lab and Akira Terao’s, D.V.M., Ph.D., lab at Hokkaido University, Sapporo, Japan, to look at neighboring cells that produce melanin concentrating hormone (MCH), a molecule known to be involved in the control of both sleep and appetite. In agreement with previous studies, the researchers found that a majority (52.8%) of hypothalamic MCH cells fired when mice underwent REM sleep whereas about 35% fired only when the mice were awake and about 12% fired at both times. They also uncovered clues suggesting that these cells may play a role in learning and memory. Electrical recordings and tracing experiments showed that many of the hypothalamic MCH cells sent inhibitory messages, via long stringy axons, to the hippocampus, the brain’s memory center. “From previous studies done in other labs, we already knew that MCH cells were active during REM sleep. After discovering this new circuit, we thought these cells might help the brain store memories,” said Dr. Kilduff. To test this idea, the researchers used a variety of genetic tools to turn on and off MCH neurons in mice during memory tests. Specifically, they examined the role that MCH cells played in retention, the period after learning something new but before the new knowledge is stored, or consolidated, into long term memory. The scientists used several memory tests including one that assessed the ability of mice to distinguish between new and familiar objects. To their surprise, they found that “turning on” MCH cells during retention worsened memory whereas turning the cells off improved memories. For instance, activating the cells reduced the time mice spent sniffing around new objects compared to familiar ones, but turning the cells off had the opposite effect. Further experiments suggested that MCH neurons exclusively played this role during REM sleep. Mice performed better on memory tests when MCH neurons were turned off during REM sleep. In contrast, turning off the neurons while the mice were awake or in other sleep states had no effect on memory.
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Read More »“These results suggest that MCH neurons help the brain actively forget new, possibly, unimportant information,” said Dr. Kilduff. “Since dreams are thought to primarily occur during REM sleep, the sleep stage when the MCH cells turn on, activation of these cells may prevent the content of a dream from being stored in the hippocampus – consequently, the dream is quickly forgotten.” In the future, the researchers plan to explore whether this new circuit plays a role in sleep and memory disorders. This work was supported by supported by grants from: the NIH (NS098813); the Japan Science and Technology Agency CREST program (JPMJCR1656); and the Japan Society for the Promotion of Science KAKENHI program (26293046, 26640041, 16H01271, 17H05563, 18H02523, 18KK0223, 18H05124, 15K07140, 18H02477, 18J21663 to S.I.). This press release describes a basic research finding. Basic research increases our understanding of human behavior and biology, which is foundational to advancing new and better ways to prevent, diagnose, and treat disease. Science is an unpredictable and incremental process — each research advance builds on past discoveries, often in unexpected ways. Most clinical advances would not be possible without the knowledge of fundamental basic research. NINDS is the nation’s leading funder of research on the brain and nervous system. The mission of NINDS is to seek fundamental knowledge about the brain and nervous system and to use that knowledge to reduce the burden of neurological disease. About the National Institutes of Health (NIH): NIH, the nation's medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit www.nih.gov.
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