Protective effect of murine norovirus on neonatal mouse model of necrotizing enterocolitis
- Journal of Third Military Medical University Vol. 40, Issue 10, Pages: 898-903(2018)
- 作者机构：
400014 重庆，重庆医科大学附属儿童医院新生儿科，儿童发育疾病研究教育部重点实验室，儿科学重庆市重点实验室，儿童发育重大疾病国家国际科技合作基地
- 作者简介：
- 基金信息：Supported by the General Program of National Natural Science Foundation of China (81571483) and the Clinical Research Project of the Children's Hospital of Chongqing Medical University(2014-254-lcyj2014-11)
DOI：10.16016/j.1000-5404.201709146
CLC： R-332;R373.9;R725.746.2Received：19 September 2017，
Revised：2018-02-05，
Published：30 May 2018
- 稿件说明：
移动端阅览
Kun HU, Jialin YU, Qing AI, et al. Protective effect of murine norovirus on neonatal mouse model of necrotizing enterocolitis[J]. Journal of Third Military Medical University, 2018, 40(10): 898-903.
Kun HU, Jialin YU, Qing AI, et al. Protective effect of murine norovirus on neonatal mouse model of necrotizing enterocolitis[J]. Journal of Third Military Medical University, 2018, 40(10): 898-903. DOI： 10.16016/j.1000-5404.201709146.
摘要
目的
2
探讨鼠诺如病毒(murine norovirus，MNV)在新生小鼠坏死性小肠结肠炎(necrotizing enterocolitis，NEC)模型中的作用，并分析其可能的作用机制。
方法
2
将75只新生1 d的C57BL/6J小鼠按随机数字表法分为3组(
n
=25)：正常对照组、给予PBS的NEC模型组(PBS+NEC组)和给予MNV干预的NEC模型组(MNV+NEC组)。正常对照组与母鼠同笼，不予任何处理；其余两组进行NEC动物模型构建。新生小鼠于生后1 d给予联合抗生素，连续灌胃10 d模拟无菌后，行NEC建模3 d，建模前后固定时间点称量体质量，第14天处死小鼠，HE染色观察回盲部肠组织病理学变化；qPCR法检测TLR-3、MDA-5、IL-6、IL-10、IL-1β、IL-22基因表达水平；流式细胞仪检测3型天然淋巴样细胞(type 3 innate lymphoid cells，ILC3)数量；ELISA法检测肠组织匀浆IL-10水平。
结果
2
与正常对照组相比，PBS+NEC组、MNV+NEC组小鼠体质量明显降低（
P
<
0.01），肠道损伤明显。与PBS+NEC组相比，MNV+NEC组体质量下降较少（
P
<
0.05），肠上皮损伤也较轻；而在mRNA表达水平上，TLR-3（0.73±0.26
vs
0.62±0.40
P
>
0.05）、MDA-5（0.98±0.35
vs
0.67±0.39
P
>
0.05）、IL-10（1.22±0.36
vs
0.60±0.31，
P
<
0.01）、IL-22（1.20±0.38
vs
0.65±0.22，
P
<
0.05）基因表达增高，IL-6（0.75±0.33
vs
1.22 ±0.34
P
<
0.05）、IL-1β（0.39±0.2
vs
1.25±0.59，
P
<
0.01)炎症因子基因表达降低；IL-10水平显著升高[(165.55±53.51) pg/mL
vs
(129.59±26.22) pg/mL，
P
<
0.05
]
，ILC3数量差异无统〖JP2〗计学意义[(12.88±1.45)%
vs
(12.80±0.76)%
P
>
0.05
]
，但其分泌的IL-22表达升高。
结论
2
MNV在新生小鼠NEC模型肠道损伤中起保护作用，可能与MNV下调炎症因子IL-6、IL-1β，上调抑炎因子IL-10及分泌IL-22的ILC3的功能有关。
Abstract
Objective
2
To investigate the role of murine norovirus (MNV) in neonatal mouse model of necrotizing enterocolitis (NEC)
and to explore the possible mechanism.
Methods
2
Seventy-five 1-day-old C57BL/6J mice were randomly divided into 3 groups (
n
=25 for each group): control group
NEC model with phosphate buffer saline treatment (PBS+NEC group)
and MNV intervention
group (MNV+NEC group). The neonatal mice in the control group were living with their mothers without submitting to stress. The mice in the NEC group were intragastrically infused with combined antibiotics for 10 consecutive days
while those from the intervention group were given MNV (2×10
6
pfu) on days 1
2
5
6
9 and 10. Then the animals of the 2 groups were induced to build the NEC model. The weights of mice were measured at a given time point before and after the model establishment. In 3 d later
all mice were sacrificed by decapitation
and the proximal intestines of ileocecal junction were harvested for pathological observation after HE staining. The mRNA expression levels of TLR-3
MDA-5
IL-6
IL-10
IL-1β and IL-22 were tested by quantitative real-time PCR. The counts of type 3 innate lymphoid cells (ILC3) were detected by flow cytometry. The levels of IL-10 in intestine tissues were evaluated by ELISA.
Results
2
Compared with the control group
the weight of the other 2 groups was decreased (
P
<
0.01) and the intestinal injury were obviously aggravated. However
the weight was decreased less fast (
P
<
0.05)
and the intestinal lesions were less severe in the MNV+NEC group than the PBS+NEC group. The MNV+NEC group had higher mRNA levels of TLR-3 (0.73±0.26
vs
0.62±0.40
P
>
0.05)
MDA-5 (0.98±0.35
vs
0.67±0.39
P
>
0.05)
IL-10 (1.22±0.36
vs
0.60±0.31
P
<
0.01)
and IL-22 (1.20±0.38
vs
0.65±0.22
P
<
0.05)
while lower levels of IL-6 (0.75±0.33
vs
1.22 ±0.34
P
<
0.05) and IL-1β (0.39±0.2
vs
1.25±0.59
P
<
0.01). The content of IL-10 was increased in the intestine tissues (165.55±53.51
vs
129.59±26.22 pg/mL
P
<
0.05)
but no such difference was seen in the count of ILC3
[(12.88±1.45)%
vs
(12.80±0.76)%
P
>
0.05
]
and the secretion of IL-22 was increased.
Conclusion
2
MNV plays a protective role in intestinal injury in neonatal mice with NEC
which may be related with down-regulating IL-6 and IL-1β
up-regulating IL-10 and function of ILC3 with secreting IL-22 cytokines.
关键词
Keywords
references
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