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Tumor Biology

, Volume 37, Issue 10, pp 13951–13959 | Cite as

Extracellular HSP70-peptide complexes promote the proliferation of hepatocellular carcinoma cells via TLR2/4/JNK1/2MAPK pathway

  • Yi Zhe
  • Yan Li
  • Dan Liu
  • Dong-Ming Su
  • Jin-Gang Liu
  • Hang-Yu Li
Original Article

Abstract

Heat shock protein 70 (HSP70) and HSP70-peptide complexes (HSP70-PCs) have been implicated in the pathogenesis of multiple tumors in humans and have been experimentally shown to increase the proliferation of cell lines derived from hepatocellular carcinoma. The goal of this study was to elucidate the molecular mechanisms through which extracellular HSP70/HSP70-PCs stimulate the proliferation of hepatocellular carcinoma (HCC). The molecular mechanisms of HSP70/HSP70-PC action were studied in the human hepatocellular carcinoma cell lines HepG2 and Huh-7, as well as tumor tissue collected from patients with HCC (n = 95). We found that HSP70/HSP70-PCs can stimulate the proliferation of HepG2 cells and that this effect is blocked by knocking down TLR2 and TLR4 expression by RNA interference. A physical interaction between HSP70/HSP70-PCs and TLR2/4 was established using co-immunoprecipitation and pull-down assays. Pharmacological inhibition of different branches of the MAPK intracellular signaling pathway indicated that the extracellular HSP70/HSP70-PC effect was mediated by the JNK1/2 signaling pathway within the cell. We also studied TLR2 and TLR expression at the protein and messenger RNA (mRNA) level in tumor and non-tumor tissue in patients with HCC (n = 95), finding that TLR2 and 4 are increased in HCC tumor tissue and that the expression of TLR2 correlates with clinicopathologic features of HCC. Our data conclusively demonstrates that extracellular HSP70/HSP70-PCs can promote the proliferation of HCC cells through activation of TLR2 and TLR4 and subsequent activation of the intracellular JNK1/2/MAPK signaling pathway.

Keywords

Extracellular HSP70-PCs TLR2 TLR4 JNK1/2MAPK Proliferation Hepatocellular carcinoma 

Notes

Acknowledgments

This study is supported by the National Natural Science Foundation of China (No. 81071955) and the Scientific Research from Educational Department of Liaoning Province, China (No. 2013021088).

Compliance with ethical standards

The Institutional Review Board of the Shengjing Hospital of China Medical University approved the use of human tissue samples for this project. All patients gave their informed and written consent for the use of the clinical specimens for research.

Conflicts of interest

None

Supplementary material

13277_2016_5189_MOESM1_ESM.doc (27 kb)
Table S1 (DOC 27 kb)

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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2016

Authors and Affiliations

  • Yi Zhe
    • 1
  • Yan Li
    • 2
  • Dan Liu
    • 3
  • Dong-Ming Su
    • 4
  • Jin-Gang Liu
    • 3
  • Hang-Yu Li
    • 3
  1. 1.School of StomatologyChina Medical UniversityShenyangChina
  2. 2.Department of Oncology, Tumour Angiogenesis and Microenvironment Laboratory (TAML), First Affiliated HospitalLiaoning Medical CollegeJinzhouChina
  3. 3.Department of General SurgeryThe Fourth Affiliated Hospital of China Medical UniversityShenyangChina
  4. 4.Center of Metabolic Disease ResearchNanjing Medical UniversityNanjingChina

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