Oncotarget

Clinical Research Papers:

Nuclear localization of B7-H4 in pulmonary adenocarcinomas presenting as a solitary pulmonary nodule

Cheng Chen, Wei-Dong Zhu, Fang Xie and Jian-An Huang _

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Oncotarget. 2016; 7:58563-58568. https://doi.org/10.18632/oncotarget.10542

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Abstract

Cheng Chen1,*, Wei-Dong Zhu2,*, Fang Xie3, Jian-An Huang1

1Respiratory Department, The First Affiliated Hospital of Soochow University, Suzhou, 215006, China

2Pathology Department, The First Affiliated Hospital of Soochow University, Suzhou, 215006, China

3Pathology Department, Soochow University, Suzhou, 215006, China

*These authors contributed equally to this work

Correspondence to:

Jian-An Huang, email: [email protected]

Keywords: B7-H4, solitary pulmonary nodule, adenocarcinoma, ground-glass opacity

Received: November 27, 2015     Accepted: June 25, 2016     Published: July 12, 2016

ABSTRACT

Purpose: Although the pathogenicity of B7-H4 in cancer is well established, its role in pulmonary adenocarcinoma, especially lesions presenting as solitary pulmonary nodules (SPNs), remains unclear.

Methods: 40 cases of pulmonary adenocarcinoma presenting with SPN were enrolled during year 2012–2015. The B7-H4 expression and its subcellular distribution in pulmonary adenocarcinoma presenting with SPN were analyzed by immunohistochemistry, further its correlation with Ki-67 expression and CT feature. In vitro, the B7-H4 expression in the cytoplasmic and nucleus fractions of lung cancer cell lines was determinate by western blotting.

Results: Immunostaining revealed B7-H4 in the cytoplasm of cells from all 40 SPN samples studied. No surface localization of B7-H4 was detected, but in 18 samples the nuclear membranes were B7-H4-positive. Moreover, patients with more poorly differentiated and invasive adenocarcinomas showed greater localization of B7-H4 to the nuclear membrane. The percentage of lesions with ground-glass opacity was significantly greater among samples negative for nuclear membrane B7-H4. Most importantly, there was a statistically significant relationships between the Ki-67 index and B7-H4 positivity of the nuclear membrane. This suggests tumors exhibiting higher nuclear membrane B7-H4 have greater proliferative potential. Western blotting confirmed both cytoplasmic and nuclear B7-H4 localization in lung adenocarcinoma cell lines.

Conclusions: Taken together, our study provides a new insight into the tumorigenicity of B7-H4 in lung adenocarcinoma. We suggest that in pulmonary adenocarcinoma presenting with SPN, nuclear membrane localization of B7-H4 within the tumor cells is associated with increased malignancy.


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