[Changes in three-dimensional arterial spin labeling perfusion imaging of the hippocampus in depressive mice].

OBJECTIVE

To study the behavioral changes of inositol 1, 4, 5-trisphosphate receptor type 2 knockout ( mice) and investigate the blood perfusion changes in the hippocampus using three-dimensional arterial spin labeling (3D-ASL).

METHODS

28 mice and 20 wild-type mice were assessed for depressive phenotype using behavioral tests (including sucrose consumption test, tail suspension test, forced swimming test and open field test). 15 mice and 14 wild-type mice were randomly selected for 3D-T2WI imaging of the whole brain and 3D-ASL imaging of the middle hippocampal layer, and cerebral blood flow (CBF) of the middle hippocampal layer was calculated. ITK-SNAP was used to delineate the bilateral hippocampal area and measure the average CBF value.

RESULTS

Compared with the wild-type mice, mice exhibited a distinct depressive phenotype with significantly decreased sucrose preference ( < 0.05) and increased immobile time in tail suspension test ( < 0.05) and forced swimming test ( < 0.01), without obvious changes in the performance in open field test ( > 0.05). Significantly decreased mean CBF values were found in the left and right hippocampus of mice as compared with the wild-type mice (left: 73.30 ±5.609 95.77±5.095; right: 73.53±5.700 100.5±4.696; bilateral means: 73.42±5.607 98.12±4.754; < 0.01).

CONCLUSIONS

Itpr2 deficiency can cause depressive phenotype and affect the cerebral blood flow in the hippocampus of mice.