Splenectomy suppresses growth and metastasis of hepatocellular carcinoma through decreasing myeloid-derived suppressor cells in vivo

• Published in: Journal of Huazhong University of Science and Technology. Medical sciences Vol. 36; no. 5; pp. 667 - 676
• Main Authors: Long, Xin, Wang, Jian, Zhao, Jian-ping, Liang, Hui-fang, Zhu, Peng, Cheng, Qi, Chen, Qian, Wu, Yan-hui, Zhang, Zhan-guo, Zhang, Bi-xiang, Chen, Xiao-ping
• Format: Journal Article
• Language: English
• Published: Wuhan Huazhong University of Science and Technology 01.10.2016; Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China%Department of Gastroenterology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
• Subjects: Animals; Carcinoma, Hepatocellular - physiopathology; Carcinoma, Hepatocellular - surgery; Cell Line, Tumor; Flow Cytometry; Humans; Liver Neoplasms - physiopathology; Liver Neoplasms - surgery; Medicine; Medicine & Public Health; Mice; Myeloid-Derived Suppressor Cells - pathology; Neoplasms, Experimental - physiopathology; Neoplasms, Experimental - surgery; Spleen - physiopathology; Spleen - surgery; Splenectomy - methods; adjuvant therapy; liver cancer; splenectomy; myeloid-derived suppressor cells
• ISSN: 1672-0733; 1993-1352
• DOI: 10.1007/s11596-016-1643-2

The function of the spleen in tumor development has been investigated for years. The relationship of the spleen with hepatocellular carcinoma (HCC), a huge health burden worldwide, however, remains unknown. The present study aimed to examine the effect of splenectomy on the development of HCC and the possible mechanism. Mouse hepatic carcinoma lines H22 and Hepa1-6 as well as BALB/c and C57 mice were used to establish orthotopic and metastatic mouse models of liver cancer. Mice were divided into four groups, including control group, splenectomy control group (S group), tumor group (T group) and tumor plus splenectomy group (T+S group). Tumor growth, metastases and overall survival were assessed at determined time points. Meanwhile, myeloid-derived suppressor cells (MDSCs) were isolated from the peripheral blood (PB), the spleen and liver tumors, and then measured by flow cytometery. It was found that liver cancer led to splenomegaly, and increased the percentage of MDSCs in the PB and spleen in the mouse models. Splenectomy inhibited the growth and progression of liver cancer and prolonged the overall survival time of orthotopic and metastatic models, which was accompanied by decreased proportion of MDSCs in the PB and tumors of liver cancer-bearing mouse. It was suggested that splenectomy could be considered an adjuvant therapy to treat liver cancer.