Translocation of Hcp1 protein in type Ⅵ secretion system of <italic style="font-style: italic">Burkholderia pseudomallei</italic> mediates formation of multinucleated giant cells

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Translocation of Hcp1 protein in type Ⅵ secretion system of Burkholderia pseudomallei mediates formation of multinucleated giant cells

Basic Medicine | 更新时间：2026-01-09

- Translocation of Hcp1 protein in type Ⅵ secretion system of Burkholderia pseudomallei mediates formation of multinucleated giant cells
- Journal of Army Medical University Vol. 46, Issue 15, Pages: 1721-1728(2024)
- 作者机构：
  
  1.400038 重庆，陆军军医大学(第三军医大学)药学与检验医学系临床微生物与免疫学教研室
  2.400038 重庆，陆军军医大学(第三军医大学)创伤与化学中毒全国重点实验室
- 作者简介：
- 基金信息：
  
  the General Program of National Natural Science Foundation of China(82272350)
- DOI：10.16016/j.2097-0927.202311040
  CLC： R378.99;R392.11;R392.3
- Received：08 November 2023，
  
  Revised：2024-01-17，
  
  Published：15 August 2024
- 稿件说明：
移动端阅览
Pan WU, Chenglong RAO, Dongqi NAN, et al. Translocation of Hcp1 protein in type Ⅵ secretion system of Burkholderia pseudomallei mediates formation of multinucleated giant cells[J]. Journal of Army Medical University, 2024, 46(15): 1721-1728.
DOI：

Pan WU, Chenglong RAO, Dongqi NAN, et al. Translocation of Hcp1 protein in type Ⅵ secretion system of Burkholderia pseudomallei mediates formation of multinucleated giant cells[J]. Journal of Army Medical University, 2024, 46(15): 1721-1728. DOI： 10.16016/j.2097-0927.202311040.

摘要

目的

2

探讨类鼻疽伯克霍尔德菌Ⅵ型分泌系统溶血素共调节蛋白1(hemolysin coregulatory protein 1

Hcp1)在感染宿主细胞引起多核巨细胞(multinucleated giant cells

MNGC)形成的作用及机制。

方法

2

分别采用同源重组和质粒回补技术构建类鼻疽菌

hcp

1基因缺失株(BPC006 Δ

hcp

1)和缺失回补株(BPC006 Δ

hcp

1::

hcp

1)；分别用类鼻疽菌BPC006野生株、BPC006 Δ

hcp

1和BPC006 Δ

hcp

1::

hcp

1感染RAW264.7细胞，通过激光共聚焦分析Hcp1蛋白的定位情况；在293T细胞中转染Hcp1真核表达载体后进行细胞质膜分离进一步验证定位情况；在细胞感染模型上，通过吉姆萨染色检测抗Hcp1多克隆抗体封闭对MNGC形成的影响，探究Hcp1在类鼻疽菌感染导致的MNGC形成中的作用和生物学意义。

结果

2

Western blot检测结果显示BPC006 Δ

hcp

1不表达Hcp1蛋白，而BPC006 Δ

hcp

1::

hcp

1能恢复Hcp1蛋白的表达，成功构建类鼻疽菌BPC006 Δ

hcp

1和BPC006 Δ

hcp

1::

hcp

1。细胞免疫荧光共定位实验和质膜分离实验都表明Hcp1可以定位在宿主细胞膜上，且相较于对照组抗Hcp1多克隆抗体能抑制类鼻疽菌感染所诱导的MNGC形成(

P

<

0.01)。

结论

2

类鼻疽菌感染RAW264.7细胞时Hcp1可转位至细胞膜，并在MNGC形成中发挥重要作用。

Abstract

Objective

2

To analyze the mechanism that Hcp1 protein in type Ⅵ secretion system of

Burkholderia pseudomallei

(

B. pseudomallei

) mediates the formation of multinucleated giant cells (MNGCs) when host cells are infected by the bacterium.

Methods

2

The mutant strain (BPC006

Δhcp

1) and complementation strain (BPC006

Δhcp

1::

hcp

1) were constructed by homologous recombination and plasmid complement technology

respectively. After RAW264.7 cells were infected with

B. pseudomallei

the localization of Hcp1 in host cells was analyzed by immunofluorescence staining. The localization was further verified by cytoplasmic-membrane isolation in 293T cells after transfecting pCDNA4.1-Hcp1. The biological significance and effect of Hcp1 were explored by the anti-Hcp1 polyclonal antibody blocking and the formation of MNGC was detected by Giemsa staining.

Results

2

Western blotting showed that BPC006

Δhcp

1 could not express Hcp1

while BPC006

Δhcp

1::

hcp

1 restored Hcp1 expression. The above results proved that the mutant and complement strains were successfully constructed. Both cellular immunofluorescence co-localization and cytoplasmic-membrane isolation experiments showed that Hcp1 localized to host cell membranes. Last but not least

compared with the control group

anti-Hcp1 polyclonal antibodies inhibited the formation of MNGC (

P

<

0.01).

Conclusion

2

Hcp1 protein in type Ⅵ secretion system of

B. pseudomallei

is able to translocate to the RAW264.7 cell membranes and plays an important role in the formation of MNGCs.

关键词

Keywords

references

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