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Open Access Highly Accessed Research article

Mycoplasma hyorhinis infection in gastric carcinoma and its effects on the malignant phenotypes of gastric cancer cells

Hua Yang12, Like Qu1, Huachong Ma3, Ling Chen1, Wenbin Liu14, Caiyun Liu1, Lin Meng1, Jian Wu1 and Chengchao Shou1*

Author Affiliations

1 Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Biochemistry and Molecular Biology, Peking University Cancer Hospital & Institute, Beijing 100142, PR China

2 Current address: Medical Testing College, Ningxia Medical University, Yinchuan 750004, PR China

3 Department of General Surgery, Beijing Chaoyang Hospital, Beijing 100043, PR China

4 Current address: Department of Health Science and Nursing, Wuhan Polytechnic University, Wuhan 430023, PR China

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BMC Gastroenterology 2010, 10:132  doi:10.1186/1471-230X-10-132

Published: 10 November 2010

Abstract

Background

Mycoplasma hyorhinis infection has been postulated to play a role in the development of several types of cancer, but the direct evidence and mechanism remained to be determined.

Methods

Immunohistochemistry assay and nested polymerase-chain reaction (PCR) were performed to examine the mycoplasma hyorhinis infection in gastric cancer tissues. Statistical analysis was used to check the association between mycoplasma infection and clinicopathologic parameters. Transwell chamber assay and metastasis assay were used to evaluate mycoplasma hyorhinis' effects on metastasis in vitro and in vivo. Mycoplasma hyorhinis-induced extracellular signal-regulated kinase (ERK) and epidermal growth factor receptor (EGFR) activation were investigated by Western blot.

Results

Mycoplasma hyorhinis infection in gastric cancer tissues was revealed and statistical analysis indicated a significant association between mycoplasma infections and lymph node metastasis, Lauren's Classification, TNM stage, and age of the patients. Mycoplasma hyorhinis promoted tumor cell migration, invasion and metastasis in vitro and in vivo, which was possibly associated with the enhanced phosphorylation of EGFR and ERK1/2. The antibody against p37 protein of Mycoplasma hyorhinis could inhibit the migration of the infected cells.

Conclusions

The infection of mycoplasma hyorhinis may contribute to the development of gastric cancer and Mycoplasma hyorhinis-induced malignant phenotypes were possibly mediated by p37.