Effects of epilepsy on neuronal processes and synapses in the cerebral cortex and hippocampus of young mice
10.16557/j.cnki.1000-7547.2024.04.011
- VernacularTitle:癫痫对幼年小鼠大脑皮质和海马神经元突起及突触的影响
- Author:
Tongxing DENG
1
;
Minli WANG
;
Cheng CHANG
;
Li JIANG
;
Wenjuan FAN
Author Information
1. 漯河医学高等专科学校解剖教研室,漯河 462002
- Keywords:
status epilepticus(SE);
hippocampus;
synapse;
synaptic vesicles;
synaptic reconstruction;
mouse
- From:
Chinese Journal of Neuroanatomy
2024;40(4):478-484
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To explore the effects of status epilepticus(SE)on neuronal processes and synapses in the cerebral cortex and hippocampus of young mice.Methods:The young mice of SE model was established by intraperito-neal injection of lithium chloride and pilocarpine.Morris water maze test was used to detect the behavioral changes in the mice.Immunofluorescence staining was used to observe the morphological changes of axons,dendrites and synaptic connections of neurons in the cerebral cortex and hippocampus of mice,and the ultrastructural changes of synapses of pyramidal neurons in the mouse hippocampus were observed with transmission electron microscopy.Results:The sei-zure rate of grade IV and above in mice was 80％,and the mortality rate was 25％.The escape latency of SE mice was prolonged(P＜0.05),the trajectory of exploring the platform was significantly longer and more complicated,and the time spent in the target quadrant and the number of crossing the platform were significantly reduced(P＜0.05).Posi-tive expression of axonal neurofilament marker protein SMI312 and microtubule-associated protein 2(MAP2)were found in the cerebral cortex and hippocampus of both groups,and the axonal neurofilaments and neuronal dendrites in the SE group were of different lengths and arranged densely and scatteredly.The positive expression of synaptophysin(SYP)and the number of positive spots increased significantly in in the hippocampus of SE group(P＜0.01).The number of synaptic vesicles in the SE group increased significantly,and the postsynaptic density(PSD)thickness decreased significantly(P＜0.01).Conclusion:SE might lead to acute injury of synapses in the cerebral cortex and hippocampal area of young mice,induce synaptic vesicle circulation disorders,and then cause widespread destruction and disorder of the axon and dendrite networks,the reactive or compensatory reconstruction of synaptic.
