Summary: A new study uncovers a pancreas–hippocampus feedback loop that may help explain mood swings in bipolar disorder. Using patient-derived pancreatic islets, researchers found reduced insulin secretion linked to elevated RORβ, a bipolar risk gene. In mice, pancreatic RORβ overexpression caused depression-like behaviors during the day and mania-like behaviors at night through shifts in insulin release and hippocampal activity. The …
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