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400014 重庆,重庆医科大学附属儿童医院新生儿科,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,儿童感染免疫重庆市重点实验室
[ 史源,E-mail:shiyuan@hospital.cqmu.edu.cn SHI Yuan, E-mail: shiyuan@hospital.cqmu.edu.cn
收稿:2022-11-06,
修回:2023-02-25,
纸质出版:2023-07-15
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张玉妮, 张兴道, 贺雨, 等. 丁酸钠对坏死性小肠结肠炎小鼠脑损伤的保护作用[J]. 陆军军医大学学报, 2023,45(13):1388-1396.
Yuni ZHANG, Xingdao ZHANG, Yu HE, et al. Protective effect of sodium butyrate on brain injury in mice with necrotizing enterocolitis[J]. Journal of Army Medical University, 2023, 45(13): 1388-1396.
张玉妮, 张兴道, 贺雨, 等. 丁酸钠对坏死性小肠结肠炎小鼠脑损伤的保护作用[J]. 陆军军医大学学报, 2023,45(13):1388-1396. DOI: 10.16016/j.2097-0927.202211032.
Yuni ZHANG, Xingdao ZHANG, Yu HE, et al. Protective effect of sodium butyrate on brain injury in mice with necrotizing enterocolitis[J]. Journal of Army Medical University, 2023, 45(13): 1388-1396. DOI: 10.16016/j.2097-0927.202211032.
目的
2
探究丁酸钠对坏死性小肠结肠炎(necrotizing enterocolitis,NEC)小鼠脑损伤的影响。
方法
2
137只3 d龄C57BL/6新生鼠分为:对照组(CON组,
n
=40,不与母鼠分离)、NEC+PBS灌胃组(NP组,
n
=57)和NEC+丁酸钠灌胃组(NB组,
n
=40),NP组和NB组分别从3 d龄开始予PBS或丁酸钠灌胃,干预7 d后与母鼠分离,采用人工喂养联合缺氧冷刺激的方法连续3 d刺激建立NEC模型。分析各组小鼠存活率,肠组织病理损伤情况,脑组织TNF-α、IL-6 mRNA水平以及活化的小胶质细胞和星形胶质细胞的表达情况。采用水迷宫实验和透射电镜检测各组成年小鼠学习记忆能力和髓鞘微结构改变。Western blot检测肠组织HMGB1和脑组织TLR4、NF-κB蛋白表达水平。
结果
2
与CON组相比,NP组小鼠大脑中TNF-α、IL-6 mRNA表达显著上调(1.51±0.20
vs
0.67±0.14,
P
<
0.05;2.03±0.39
vs
1.01±0.17,
P
<
0.05),活化的小胶质细胞增加(751.00±82.35
vs
284.70±52.01,
P
<
0.05),星形胶质细胞数量增加(
P
<
0.05),肠组织HMGB1和脑组织TLR4、NF-κB蛋白表达水平显著升高(1.76±0.19
vs
0.73±0.06,
P
<
0.0
5;1.14±0.16
vs
0.81±0.01,
P
<
0.05;1.21±0.19
vs
0.60±0.15,
P
<
0.05);NP组成年小鼠水迷宫逃避潜伏期延长(
P
<
0.05),平台穿越次数减少(
P
<0.05),G-ratio显著升高(
P
<
0.05)。而与NP组相比,NB组小鼠大脑中TNF-α、IL-6 mRNA表达水平降低(0.81±0.12
vs
1.51±0.20,
P
<
0.05;0.93±0.38
vs
2.03±0.39,
P
<
0.05),小胶质细胞活化减少(468.00±99.59
vs
751.00±82.35,
P
<
0.05),星形胶质细胞减少(
P
<
0.05),肠组织HMGB1和脑组织TLR4、NF-κB蛋白表达降低(1.22±0.11
vs
1.76±0.19,
P
<
0.05;0.88±0.06
vs
1.14±0.16,
P
<
0.05;0.70±0.19
vs
1.21±0.19,
P
<
0.05);成年小鼠水迷宫逃避潜伏期缩短(
P
<
0.05),平台穿越次数增加(
P
<0.05),髓鞘厚度增加(
P
<
0.05)。
结论
2
丁酸钠可通过抑制大脑中的TLR4-NF-κB通路减轻神经炎症反应,从而发挥对NEC远期相关脑损伤的保护作用。
Objective
2
To explore the effect of sodium butyrate on brain injury in mice with necrotizing enterocolitis (NEC).
Methods
2
A total of 137 3-day-old C57BL/6 mice were randomly divided into Control group (CON group
n
=40
without maternal separation)
NEC+PBS group (NP group
n
=57) and NEC+butyrate group (NB group
n
=40). The mice from the NP and NB groups were separated maternally and given either PBS or sodium butyrate by gavage from postnatal day 3 for 7 consecutive days
then a NEC model was established by formula feeding combined with hypoxia and hypothermia for 3 consecutive days. Survival rate
histopathological injury of the intestine
mRNA expression of TNF-α and IL-6 in the brain
and number of activated microglia and astrocytes were observed and detected. Morris water maze and transmission electron microscopy were employed to
observe the long-term cognitive impairment and microstructure of myelin
respectively
for the adult mice (4 weeks old). Western blotting was used to measure the protein level of HMGB1 in the intestine and TLR4 as well as NF-κB in the brain.
Results
2
Compared with the CON group
the mice of the NP group showed increased mRNA expression of TNF-α(1.51± 0.20
vs
0.67±0.14) and IL-6 (2.03±0.39
vs
1.01±0.17) in the brain (both
P
<
0.05)
raised number of activated microglia (751.00±82.35
vs
284.70±52.01
P
<
0.05) and astrocytes (
P
<
0.05) in the hippocampus
and elevated protein levels of HMGB1 (1.76±0.19
vs
0.73±0.06) in the intestine as well as TLR4 (1.14±0.16
vs
0.81±0.01) and NF-κB (1.21±0.19
vs
0.60±0.15) in the brain (all
P
<
0.05). In addition
the adult mice in the NP group demonstrated the prolonged escape latency and decreased crossing-platform times
and increased G-ratio (all
P
<
0.05). After the administration of sodium butyrate
the mRNA expression levels of TNF-α(0.81±0.12
vs
1.51±0.20) and IL-6 (0.93±0.38
vs
2.03±0.39) in the brain were decreased
the activation of microglia was inhibited (468.00±99.59
vs
751.00±82.35)
and the number of astrocytes was reduced (all
P
<
0.05). The decreased expression levels of HMGB1 (1.22±0.11
vs
1.76±0.19) in the intestine and TLR4 (0.88±0.06
vs
1.14±0.16) and NF-κB (0.70±0.19
vs
1.21±0.19) in the brain were also marked in the NB group (all
P
<
0.05). The adult mice of the NB group showed shortened escape latency
and increased crossing-platform times and myelin thickness (all
P
<
0.05).
Conclusion
2
Sodium butyrate alleviates the neuroinflammation by inhibiting the activation of TLR4-NF-κB signal pathway in the NEC brain
and thus exerts protective effect against NEC-associated brain injury.
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