Effects of advanced maternal age on hippocampal synaptic pruning in offspring rats
10.11855/j.issn.0577-7402.0804.2025.0218
- VernacularTitle:高龄妊娠对子代大鼠海马突触修剪的影响
- Author:
Chun-Xue JIANG
1
;
Zi-Yao HAN
;
Xin-Ru YAN
;
Wei HAN
;
Li JIANG
Author Information
1. 重庆医科大学附属儿童医院神经内科/国家儿童健康与疾病临床医学研究中心/儿童发育疾病研究教育部重点实验室/儿童神经发育与认知障碍重庆市重点实验室,重庆 400014
- Keywords:
advanced maternal age;
offspring rat;
hippocampus;
dendrites;
neuronal plasticity
- From:
Medical Journal of Chinese People's Liberation Army
2025;50(5):575-580
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effects of advanced maternal age(AMA)on synaptic pruning of the hippocampus of offspring rats.Methods Offspring of 3-month-old SD female rats and 3-month-old SD male rats were designated as the appropriate age group(Ctl group),while offspring of 12-month-old SD female rats and 3-month-old SD male rats were assigned to AMA group.Hippocampal tissues from both groups(n=3 per group at each time point)were subjected to Golgi staining on postnatal days(P)7,28,and 60.Dendritic complexity,spine density(DS),and morphology of immature brain neurons at different age stages were compared between the two groups.Results Compared with Ctl group,the dendritic length of AMA group on P7,P28,and P60 was significantly shortened,and the average number of intersections between dendrites and concentric circles on P28 and P60 was also significantly decreased(P<0.05).Compared with Ctl group,the dendritic spine density of AMA group was significantly decreased on P7,P28,and P60.Notably,the density of thin-shaped dendritic spines in AMA group was increased on P7,whereas the densities of stubby-shaped and mushroom-shaped dendritic spines were decreased(P<0.05).On P28 in AMA group,the densities of thin-shaped and mushroom-shaped dendritic spines were significantly increased compared with Ctl group,while the density of stubby-shaped dendritic spines was significantly decreased(P<0.05).The densities of stubby-shaped and mushroom-shaped dendritic spine were markedly lower in AMA group on P60 than those in Ctl group(P<0.05).Conclusions During postnatal brain development periods,there were abnormalities in synaptic pruning in the hippocampal region of the offspring of the AMA,which manifested as reduced dendritic complexity,decreased dendritic spine density,and disorganized dendritic spine morphology.It could be one of the key mechanisms underlying brain dysfunction in the offspring of AMA.
