参芪解郁方对母婴分离子代大鼠成年后Papez 环路相关 脑区磁共振波谱的影响

Objective To explore the effect and mechanism of Shenqi Jieyu Formula ( SQJYF) on depression and anxiety-like behavior in adult ofispring rats after maternal separation ( MS). This was done by observing the levels of metabolites in the hippocampus and prefrontal cortex of the Papez circuit through magnetic resonance spectroscopy ( MRS). Methods Twenty-four Sprague-Dawley rats at 16 days of pregnancy were divided into the normal, model, SQJYF, and fluoxetine groups using the random number table method, with six rats per group. MS was performed 4 h a day from the first to the 21st day after birth. Starting from the 15th day, the corresponding medications ( SQJYF group: 12. 5 g/kg, fluxetine group: 2. 33 mg/kg) were administered to mother rats once a day for 7 consecutive days. Normal breastfeeding was performed during the gavage. The offspring rats were weaned on the 22nd day. According to the experimental grouping of mother rats, one male and one female offspring rat of each mother rat were randomly selected using the random number table method, with six rats per group. They were divided into normal, model, SQJYF, and fluoxetine female and male rat groups, respectively. After 8 weeks of feeding, the offspring rats in each group were subjected to forced swimming test ( FST), the sucrose water consumption test, and open field tests ( OFT), and the elevated plus maze ( EPM) test was conducted. The relative values of N-acetyl-aspartate ( NAA), choline ( Cho), glutamic acid ( Glu), myo-inositol (ml), and creatine (Cr) in the hippocampus and prefrontal cortex were detected using MRS. Results Compared with that of the normal female and male rat groups, the weight of the rats in the model group was decreased as well as sucrose water consumption and the horizontal and vertical scores of OFT, whereas the immobility time of FST increased. Compared with the normal female and male rat group, the NAA/Cr and Glu/Cr values in the bilateral hippocampus and prefrontal cortex of the female and male rats in the model group decreased ( all P<0. 01). The proportion of rats entering the open arm and open arm residence time of the model female rat group in the EPM test decreased, whereas the Cho/ Cr value of the right hippocampus of the female rats in the model group increased ( P<0. 05). Compared with the model female and male rat group, the weight of the rats in the SQJYF and fluoxetine groups increased, the immobility time of FST decreased, but the sucrose water consumption and the horizontal and vertical OFT scores increased ( P<0. 01). The proportion of rats entering the open arm and open arm residence time in the EPM increased in the SQJYF and fluoxetine female rat groups compared to those of the model female rat group ( P<0.01). Compared with the model female rat group, the NAA/Cr and Glu/ Cr values in the bilateral hippocampus and prefrontal cortex of female rats in the SQJYF and fluoxetine groups increased. The NAA/Cr and Glu/Cr values in the right hippocampus and prefrontal cortex of male rats in the SQJYF and fluoxetine groups were higher than those in the model group ( P< 0. 05), whereas the Cho/Cr value in the right hippocampus of female and male rats in the SQJYF and fluoxetine groups decreased ( P < 0. 05). Conclusion MS in early life can lead to depression and anxiety-like behavior in adult offspring. However, SQJYF may exert antidepressant and anti-anxiety effects by regulating the metabolite levels in related brain regions of the Papez circuit. [ABSTRACT FROM AUTHOR]