Establishment of mouse model of secondary otitis media by trans-bullar injection of <italic style="font-style: italic">Streptococcus pneumoniae</italic> following influenza infection

Fangmei FAN; Yurong MA; Zimeng WANG; Wei WANG; Yilin DONG; Xian HE; Xinxin ZHANG; Yujuan HE

doi:10.16016/j.1000-5404.201710091

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Establishment of mouse model of secondary otitis media by trans-bullar injection of Streptococcus pneumoniae following influenza infection

Basic Medicine | 更新时间：2026-01-09

- Establishment of mouse model of secondary otitis media by trans-bullar injection of Streptococcus pneumoniae following influenza infection
- Journal of Third Military Medical University Vol. 40, Issue 5, Pages: 400-405(2018)
- 作者机构：
  
  400016 重庆，重庆医科大学检验医学院，临床检验诊断学教育部重点实验室
- 作者简介：
- 基金信息：
  
  the General Program of National Natural Science Foundation of China(81373151)
- DOI：10.16016/j.1000-5404.201710091
  CLC： R-332;R511.7;R764.21
- Received：15 October 2017，
  
  Revised：2017-12-12，
  
  Published：15 March 2018
- 稿件说明：
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Fangmei FAN, Yurong MA, Zimeng WANG, et al. Establishment of mouse model of secondary otitis media by trans-bullar injection of Streptococcus pneumoniae following influenza infection[J]. Journal of Third Military Medical University, 2018, 40(5): 400-405.
DOI：

Fangmei FAN, Yurong MA, Zimeng WANG, et al. Establishment of mouse model of secondary otitis media by trans-bullar injection of Streptococcus pneumoniae following influenza infection[J]. Journal of Third Military Medical University, 2018, 40(5): 400-405. DOI： 10.16016/j.1000-5404.201710091.

摘要

目的

建立甲型流感病毒(influenza A viruses，IAV)感染后继发肺炎链球菌(

Streptococcus pneumoniae

，

Spn

)感染性中耳炎小鼠模型。

方法

经鼻感染不同剂量甲型H1N1型流感病毒PR8，感染后第5天听泡穿刺接种Spn建立C57BL/6小鼠继发感染中耳炎模型，观察小鼠体质量变化和生存率；于建模后不同时间点处死小鼠，制备中耳组织切片HE染色，收集中耳灌洗液进行细胞及细菌计数，ELISA检测灌洗液中炎症因子。

结果

PR8预感染可导致Spn感染性中耳炎小鼠死亡，而单纯Spn感染小鼠无死亡，小鼠体质量变化及生存率与病毒剂量呈剂量依赖方式；PR8感染后继发Spn感染小鼠中耳腔炎症细胞浸润明显多于单纯Spn感染小鼠，且细菌载量明显增加；PR8继发Spn感染小鼠中耳腔炎症因子IL-6、IFN-γ与单独Spn感染小鼠差异无统计学意义(

0.05)，而TNF-α明显增高(

0.05)。

结论

成功建立了IAV感染后继发Spn感染性中耳炎C57BL/6小鼠模型。

Abstract

Objective

To develop a model of secondary otitis media by

Streptococcus pneumoniae

(

Spn

) following influenza A virus (IAV) infection in C57BL/6 mice and explore its pathological mechanism.

Methods

C57BL/6 mice were infected intranasally with different doses of H1N1 (PR8). In 5 d later

the mice were inoculated with

Spn

via

transbullar injection to induce secondary otitis media. Body weight and survival were observed daily in all the mice. Then the mice were killed in different time periods after

Spn

inoculation. The middle ear (ME) tissues were collected for histological examination by HE staining

and the middle ear lavage fluid (MELF) were harvested for cell counting and bacterial counting. ELISA was used to detect the contents of pro-inflammatory cytokines in the MELF.

Results

Antecedent PR8 infection led to death in the mice with

Spn

-induced otitis media

while simple

Spn

inoculation had no such effect. The changes of body weight and survival rate were in a dose-dependent manner of PR8 infection. There were more infiltrated inflammation cells and larger bact

erial counts in the ME tissue of the model mice when compared with the mice after simple

Spn

inoculation. There were no significant differences in the production of proinflammatory cytokines IL-6 and IFN-γ among the model mice of secondary otitis media (

0.05)

whereas TNF-α showed a remarkable increase than the mice after simple

Spn

inoculation (

0.05).

Conclusion

A model of secondary otitis media of

Spn

following influenza A virus infection mice is successfully established in C57BL/6 mice.

关键词

Keywords

references

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Establishment of mouse model of secondary otitis media by trans-bullar injection of Streptococcus pneumoniae following influenza infection

DOI：10.16016/j.1000-5404.201710091

摘要

Abstract

关键词

Keywords

references