Effect of Lactobacillus casei on peripheral and central nervous inflammation in depressed offspring rats induced by maternal separation
10.16016/j.2097-0927.202312115
- VernacularTitle:干酪乳杆菌对母婴分离诱导子代抑郁大鼠外周及中枢神经炎症的影响
- Author:
Yurong ZHANG
1
;
Siqi TAN
;
Ruizhong WANG
;
Li WANG
;
Rui CHEN
;
Rui XU
Author Information
1. 710077 西安,西安医学院第一附属医院:科研科
- Keywords:
maternal separation;
serum;
hippocampus;
inflammatory cytokines;
indoleamine 2,3-dioxygenase-1;
depression
- From:
Journal of Army Medical University
2024;46(16):1867-1873
- CountryChina
- Language:Chinese
-
Abstract:
Objective To observe the effect of Lactobacillus casei(L.casei)on the depression-like behaviors of offspring rats induced by maternal separation(MS),and explore the potential action mechanism of probiotics to improve central nervous inflammation in depression-like behaviors.Methods MS stress was used to establish a depressed animal model in offspring.Female SD rats were randomly divided into control group(CON),MS group,and MS+L.casei group,with 8 animals in each group.The female rats and their offspring in the control group did not undergo MS intervention after delivery,while those in the MS group were separated 3 h each day,for 14 consecutive days after normal delivery.The offspring of the MS+L.casei group was given intervention of 8 ×108 CFU/(kg·d)L.casei gavage for 4 weeks.Source preference test(SPT)and forced swimming test(FST)were used to evaluate the changes in depressive behaviors of the offspring rats.ELISA was employed to determine the levels of TNF-α,IL-6,IL-1 β and IL-10 in serum and hippocampus tissue.Real-time fluorescence quantitative PCR was applied to detect the mRNA expression levels of indoleamine 2,3-dioxygenase-1(IDO1)and 5-HT mRNA in hippocampus.Results Compared with the CON group,the offspring in the MS group had significantly reduced percentage of source preference(P＜0.05),prolonged immobility time during forced swimming(P＜0.05),and decreased number of grid crossings in spontaneous activity test(though no statistical difference),indicating that the offspring rats had obvious depression-like behaviors after MS.L.casei treatment improved the behavioral changes of offspring rats caused by MS stress,with significantly increased percentage of source preference(P＜0.05)and shortened immobility time of forced swimming(P＜0.05).Compared with the conditions in the MS group,L.casei reduced the levels of IL-6,IL-1 β and TNF-α(P＜0.01)and increased that of IL-10(P＜0.05)in the hippocampus and peripheral blood,and decreased mRNA level of IDO1 and enhanced 5-HT mRNA level in hippocampus(P＜0.01)in the offspring rats of the MS+L.casei group.Conclusion MS stress induces depression-like behavior in offspring rats.L.casei inhibits the hippocampal expression of IDO1 and enhances that of 5-HT by regulating inflammatory factors in hippocampus and peripheral blood,and thus,improves depression-like behavior.
