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http://dx.doi.org/10.7314/APJCP.2012.13.8.3815

Increased Frequency of Foxp3+ Regulatory T Cells in Mice with Hepatocellular Carcinoma  

Du, Yong (Department of Gastroenterology and Hepatology, First Affiliated Hospital of Wenzhou Medical College)
Chen, Xin (Department of Gastroenterology and Hepatology, First Affiliated Hospital of Wenzhou Medical College)
Huang, Zhi-Ming (Department of Gastroenterology and Hepatology, First Affiliated Hospital of Wenzhou Medical College)
Ye, Xiao-Hua (Department of Gastroenterology and Hepatology, First Affiliated Hospital of Wenzhou Medical College)
Niu, Qing (Zhejiang Provincial Key Laboratory of Medical Genetics, Wenzhou Medical College)
Publication Information
Asian Pacific Journal of Cancer Prevention / v.13, no.8, 2012 , pp. 3815-3819 More about this Journal
Abstract
The CD4+CD25+ regulatory T cell (Treg) is a special kind of T cell subset. Studies have showed that Treg cells are involved in a number of physiological processes and pathologic conditions such as autoimmune diseases, transplantation tolerance and cancer. Tregs with unique capacity for immune inhibition can impair anti-tumour immunity and help tumor cells to escape from immune surveillance. The aim of our study was to investigate whether Tregs are involved in hepatocellular carcinoma (HCC). A BABL/C mouse with HCC in situ model was established to evaluate the Treg existence in carcinoma tissues and the changes of Tregs in spleen using flow cytometry and immunohistochemistry methods. Granzyme B expression in carcinoma tissues was analyzed by immunohistochemistry to investigate the tumor local immune status.The proportion of CD4+CD25+/CD4+ spleen lymphocytes of tumor bearing mice ($18.8%{\pm}1.26%$) was found to be significantly higher than that in normal mice ($9.99%{\pm}1.90%$) (P<0.01 ). Immunohistochemistry of spleen tissue also confirmed that there was an increase in Treg in tumor-bearing mice, while in carcinomas it showed Treg cells to be present in tumor infiltrating lymphocyte areas while Granzyme B was rarely observed. Anti-tumour immunity was suppressed, and this might be associated with the increase of Tregs. Our observations suggest that the CD4+CD25+Treg/CD4+ proportion in spleen lymphocytes can be a sensitive index to evaluate the change of Tregs in hepatocellular carcinoma mice and the Treg may be a promising therapeutic target for cancer.
Keywords
Hepatocellular carcinoma; regulatory T cell; CD4+CD25+ T cell; Foxp3; Granzyme B;
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