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IgG gene expression and its possible significance in prostate cancers
Author(s) -
Liu Yuxuan,
Chen Zhengshan,
Niu Na,
Chang Qing,
Deng Ruishu,
Korteweg Christine,
Gu Jiang
Publication year - 2011
Publication title -
the prostate
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.295
H-Index - 123
eISSN - 1097-0045
pISSN - 0270-4137
DOI - 10.1002/pros.21476
Subject(s) - prostate cancer , biology , immunohistochemistry , propidium iodide , cancer research , apoptosis , pca3 , antibody , tissue microarray , pathology , immunofluorescence , prostate , cancer , microbiology and biotechnology , medicine , programmed cell death , immunology , genetics
BACKGROUND In spite of recent advances in treatment strategies, prostate cancer (PCa) remains the second leading cause of cancer death in men with its genetic and biologic behaviors still poorly understood. Recently, accumulating evidence indicates that cancer cells, as well as some normal cells can secret IgG. This study was designed to evaluate IgG gene expression and its possible significance in PCa tissue samples and cell lines. METHODS IgG expression was assessed by immunohistochemistry, in situ hybridization, immunofluorescence, RT‐PCR, and Western blot. The possible significance of IgG was evaluated on tissue array and cell lines. To assess cell viability and proliferation, MTS assay was carried out. Apoptosis was evaluated with propidium iodide and annexin‐V staining. RESULTS Expressions of IgG and its related genes were detected in cell lines. Abundant gene expressions of Igγ and Igκ chain were detected in PCa tissue samples, but not in normal prostate tissues. In addition, IgG expression was significantly higher in PCa tissues than in the benign prostate hyperplasia tissues ( P < 0.001). Igγ expression was positively correlated to Gleason score and histological grade ( P < 0.05). Furthermore, in vitro experiments showed that anti‐human monoclonal IgG antibody suppressed cell proliferation and increased apoptosis in cultured PCa cells. CONCLUSION IgG gene expression in PCa is related to cell differentiation and clinical status. PCa cell produced IgG is involved in the biological behavior of this cancer and may serve as a useful marker for cancer cell differentiation and prognosis. Locally produced IgG could be a potential target for therapy. Prostate 72:690–701, 2012. © 2011 Wiley Periodicals, Inc.