孤独让大脑“生锈”！王福俤团队等Cell子刊：揭开社交隔离引发焦虑的新机制

Core Insights - The article discusses a study revealing the neurobiological basis of anxiety disorders caused by social isolation, highlighting the role of "ferroplasticity" in this process [3][7][15]. Group 1: Biological Basis of Loneliness - Social isolation is recognized as a significant environmental factor leading to anxiety disorders, with the World Health Organization classifying it as a global public health emergency [7]. - The study identifies iron's dual role in the brain, being essential for neuronal function but also neurotoxic when homeostasis is disrupted [7][8]. Group 2: Discovery of Ferroplasticity Mechanism - The research team conducted experiments on male mice subjected to social isolation for four weeks, which resulted in increased anxiety-like behaviors and elevated cortisol levels [9][10]. - Activation of glucocorticoid receptors (GR) in the ventral hippocampus was found to increase the expression of transferrin receptor-1 (TfR1), leading to iron accumulation and elevated levels of alpha-synuclein (α-Syn) [9][14]. Group 3: Molecular Pathway of Anxiety - The study outlines a specific molecular pathway linking social isolation to anxiety behaviors: social isolation → GR receptor activation → TfR1 upregulation → iron accumulation → α-Syn increase → synaptic function alteration → hyperactivity in the ventral hippocampus → anxiety behaviors [12][14]. Group 4: Translational Strategies - The research team developed non-invasive treatment strategies using nasal sprays of iron chelator deferoxamine (DFO) and antisense oligonucleotides targeting α-Syn, which effectively alleviated anxiety-like behaviors [16][17]. - The study suggests that social support can reverse the effects of social isolation on iron levels and α-Syn expression, indicating its therapeutic potential [16][17].