Negr1 Deficiency Modulates Sex-Specific Neurobehavioral Adaptations to Social Isolation.

Area of Science:

• Neuroscience
• Genetics
• Behavioral Science

Background:

• Neuronal growth regulator 1 (Negr1) is a cell adhesion molecule implicated in psychiatric disorders.
• Social isolation (SI) is a significant environmental stressor impacting brain function and behavior.
• Understanding Negr1's role in stress response is crucial for psychiatric research.

Purpose of the Study:

• To investigate the behavioral and molecular effects of social isolation stress in Negr1-deficient (Negr1-/-) mice.
• To determine sex-specific adaptations to social isolation in Negr1-/- mice.
• To explore the impact of Negr1 deficiency on GABAergic, neurotrophic, and IgLON gene expression.

Main Methods:

• Male and female Negr1-/- and wild-type mice were subjected to two weeks of social isolation or group housing.
• Behavioral assays included the open field test and elevated plus maze to assess exploratory and anxiety-like behaviors.
• Gene expression in the prefrontal cortex and hippocampus was analyzed using RT-qPCR.

Main Results:

• Social isolation induced weight loss in Negr1-/- mice, more pronounced in males.
• Negr1-/- males showed blunted exploratory behavior, while females exhibited increased anxiety-like behavior.
• Hippocampal Pvalb and Bdnf were downregulated in Negr1-/- mice, with altered Ntrk2, Fgfr2, and IgLON gene expression, particularly in males.

Conclusions:

• Negr1 deficiency results in sex-specific behavioral and molecular adaptations to social isolation stress.
• Negr1 plays a role in modulating neurotrophic and GABAergic signaling pathways under stress.
• These findings highlight Negr1's importance in the neurobiological response to adverse environments.