Research Keyword: nucleus accumbens

Changes in synaptic markers after administration of ketamine or psychedelics: a systematic scoping review

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This review examines how ketamine and psychedelics affect connections between brain cells. Under stressful conditions, ketamine and psychedelics appear to strengthen these connections in brain areas important for mood and learning. However, the effects are mixed under normal conditions and vary based on dose, sex, and which specific markers are measured. The findings suggest these substances may help restore brain function damaged by stress or substance use.

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Investigating the Potential of Psilocybin for Compulsive Eating in a Rat Model of Binge Eating

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Researchers tested whether psilocybin, a psychedelic compound from magic mushrooms, could help reduce compulsive eating in rats bred to binge eat high-fat, high-sugar foods. Using a fear-conditioning experiment, they found that a single dose of psilocybin did not reduce the rats’ compulsive eating behavior at the dosage tested. However, the treatment may have affected fear-related freezing responses, suggesting psilocybin might influence brain circuits involved in learning and memory.

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Sex-specific role of the 5-HT2A receptor in psilocybin-induced extinction of opioid reward

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Researchers discovered that a single dose of psilocybin can reduce opioid addiction-related behaviors in male mice by activating serotonin receptors in specific brain circuits, but this effect does not work the same way in females. The study reveals that psilocybin changes how the brain processes opioid rewards and withdrawal symptoms, suggesting psychedelics could become a new treatment approach for opioid addiction. However, important sex differences in how the brain responds mean treatments may need to be tailored differently for men and women.

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GluN2B-mediated regulation of silent synapses for receptor specification and addiction memory

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Researchers studied how a specific brain protein called GluN2B affects addiction memories from cocaine use. They found that removing this protein reduced the formation of ‘silent synapses’ – immature brain connections created by cocaine – and weakened drug-related memories. However, this also unexpectedly made mice more active, suggesting that GluN2B normally helps control both addiction memory and activity levels. The findings provide new insights into how addiction memories form and suggest potential ways to treat addiction.

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The Role of Acid-Sensing Ion Channel 1A (ASIC1A) in the Behavioral and Synaptic Effects of Oxycodone and Other Opioids

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This study examines how a specific type of brain channel called ASIC1A affects how the brain responds to opioid drugs like oxycodone and morphine. Researchers found that mice without this channel showed stronger attraction to opioid-paired locations and had unusual changes in brain connections related to opioid use. The findings suggest that targeting ASIC1A could potentially be a new way to treat opioid addiction by reducing the brain’s sensitivity to these drugs.

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The regulatory variant rs1950834 confers the risk of depressive disorder by reducing LRFN5 expression

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Researchers identified a genetic variant (rs1950834) that increases depression risk by reducing production of LRFN5, a protein important for brain connections. They found this variant affects how brain cells in a region called the nucleus accumbens produce LRFN5. When LRFN5 levels are low, mice become more depressed and sensitive to stress, but boosting LRFN5 protects against depression. This discovery could lead to new ways to diagnose and treat depression.

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