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Original article
Tim-3 fosters HCC development by enhancing TGF-β-mediated alternative activation of macrophages
  1. Wenjiang Yan,
  2. Xiao Liu,
  3. Hongxin Ma,
  4. Hualin Zhang,
  5. Xiaojia Song,
  6. Lifen Gao,
  7. Xiaohong Liang,
  8. Chunhong Ma
  1. Key Laboratory for Experimental Teratology of Ministry of Education and Department of Immunology, Shandong University School of Medicine, Jinan, China
  1. Correspondence to Dr Chunhong Ma, 44 Wenhua Xi Road, Jinan, Shandong 250012 P.R. China; machunhong{at}sdu.edu.cn

Abstract

Objective Tumour-associated macrophages (TAMs) and their alternative activation contribute greatly to the development of hepatocellular carcinoma (HCC). Tim-3 is highly expressed on macrophages and regulates macrophage functions in several conditions. However, whether Tim-3 is involved in the activation and the function of TAMs has not been reported.

Design Tim-3 expression in HCC samples was evaluated by flow cytometry, immunohistochemistry and confocal analysis. We analysed the effects of Tim-3 knockdown on macrophages in growth of H22 tumour homografts in BALB/c mice. Tim-3 interference was performed by neutralising antibody, small interfering RNA or short hairpin RNA-expressing lentivirus. Cytokine production was evaluated by reverse transcription PCR, ELISA or Cytometric Bead Array. The effects of Tim-3 interference in macrophages were examined with regard to alternative activation of macrophages and proliferation and migration of Hepa1-6 cells. Cell growth curve, colony formation and transwell assays were involved to estimate cell proliferation and migration.

Results Tim-3 expression was significantly increased in both peripheral blood monocytes and TAMs in patients with HCC. The Tim-3 expression in monocytes/TAMs strongly correlated with higher tumour grades and the poor survival of patients with HCC. Consistently, HCC conditioned medium or transforming growth factor-β fostered Tim-3 expression and the alternative activation of macrophages. Moreover, Tim-3 interference in macrophages significantly inhibited the alternative activation of macrophages and suppressed HCC cell growth both in vitro and in vivo. Blocking interleukin 6 reversed the Tim-3-mediated effects on HCC cell growth in vitro.

Conclusions Tim-3 displays critical roles in microenvironment-induced activation and protumoral effects of TAMs in HCC. Interference of Tim-3 might be great potential in HCC therapy.

  • CANCER IMMUNOBIOLOGY
  • KUPFFER CELL
  • HEPATOMA
  • MOLECULAR IMMUNOLOGY
  • TGF-BETA

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