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Hippocampal Apoptosis and Cognitive Function in Dysbindin-1B+/+ Mice
1State Key Laboratory of Medical Molecular Biology,Department of Biochemistry and Molecular Biology,Institute of Basic Medical Sciences,CAMS and PUMC,Beijing 100005,China.
Summary
Dysbindin-1B+/+ mice exhibit neuronal apoptosis in the hippocampus, leading to impaired locomotor activity and spatial memory. These findings suggest dysbindin-1B+/+ expression may contribute to anxious behaviors.
Area of Science:
- Neuroscience
- Cell Biology
- Genetics
Background:
- Dysbindin-1B is a protein implicated in various neurological functions.
- Understanding its role in neuronal health and behavior is crucial.
Purpose of the Study:
- To investigate the effects of dysbindin-1B+/+ expression on hippocampal apoptosis.
- To assess the behavioral impact of dysbindin-1B+/+ in mice, focusing on locomotor activity and spatial memory.
Main Methods:
- TUNEL assay and transmission electron microscopy were used to evaluate apoptosis in the hippocampus.
- Open field and T-maze tests were conducted to assess locomotor activity, exploratory behavior, and spatial memory in dysbindin-1B+/+ and wild-type mice.
Main Results:
- TUNEL-positive neurons and signs of apoptosis were observed in the hippocampus of dysbindin-1B+/+ mice, particularly in the dentate gyrus, but not in wild-type mice.
- Dysbindin-1B+/+ mice showed significantly reduced moving distance and time in the central area during the open field test.
- Spatial memory, assessed by T-maze test accuracy at 60s and 180s intervals, was significantly impaired in dysbindin-1B+/+ mice compared to wild-type controls.
Conclusions:
- Dysbindin-1B+/+ expression induces neuronal apoptosis in the hippocampus.
- This apoptosis may underlie the observed anxious behaviors, impaired locomotor activity, and deficits in spatial memory in dysbindin-1B+/+ mice.
