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Epimorphin promotes human hepatocellular carcinoma invasion and metastasis through activation of focal adhesion kinase/extracellular signal‐regulated kinase/matrix metalloproteinase‐9 axis
Author(s) -
Jia YaLi,
Shi Lei,
Zhou JunNian,
Fu ChunJiang,
Chen Lin,
Yuan HongFeng,
Wang YunFang,
Yan XinLong,
Xu YingChen,
Zeng Quan,
Yue Wen,
Pei XueTao
Publication year - 2011
Publication title -
hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.488
H-Index - 361
eISSN - 1527-3350
pISSN - 0270-9139
DOI - 10.1002/hep.24562
Subject(s) - focal adhesion , extracellular matrix , hepatocellular carcinoma , metastasis , cancer research , matrix metalloproteinase , kinase , matrix metalloproteinase 9 , signal transduction , microbiology and biotechnology , chemistry , medicine , cancer , biology
The high incidence rate of hepatocellular carcinoma (HCC) is mainly the result of frequent metastasis and tumor recurrence. Unfortunately, the underlying molecular mechanisms driving HCC metastasis are still not fully understood. It has been demonstrated that tumor stroma cells contribute to primary tumor growth and metastasis. Within the HCC environment, activated hepatic stellate cells (HSCs) can release a number of molecules and enhance cancer cell proliferation and invasiveness in a paracrine manner. Here, for the first time, we demonstrate that epimorphin (EPM; also called syntaxin‐2), an extracellular protein, is strongly elevated in activated HSCs within tumor stroma. We show that knockdown of EPM expression in HSCs substantially abolishes their effects on cancer cell invasion and metastasis. Ectopic expression of EPM in HCC cancer cells enhances their invasiveness; we demonstrate that the cells expressing EPM have markedly increased metastasis potential. Furthermore, EPM‐mediated invasion and metastasis of cancer cells is found to require up‐regulation of matrix metalloproteinase‐9 (MMP‐9) through the activation of focal adhesion kinase (FAK)/extracellular signal‐regulated kinase (ERK) axis. Conclusion : Our results show that EPM, secreted by activated HSCs within HCC stroma, promotes invasion and metastasis of cancer cells by activating MMP‐9 expression through the FAK‐ERK pathway. (H EPATOLOGY 2011;)