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Significant involvement of herpesvirus entry mediator in human esophageal squamous cell carcinoma
Author(s) -
Migita Kazuhiro,
Sho Masayuki,
Shimada Keiji,
Yasuda Satoshi,
Yamato Ichiro,
Takayama Tomoyoshi,
Matsumoto Sohei,
Wakatsuki Kohei,
Hotta Kiyohiko,
Tanaka Tetsuya,
Ito Masahiro,
Konishi Noboru,
Nakajima Yoshiyuki
Publication year - 2013
Publication title -
cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.052
H-Index - 304
eISSN - 1097-0142
pISSN - 0008-543X
DOI - 10.1002/cncr.28491
Subject(s) - gene silencing , immune system , cancer research , in vivo , cancer , medicine , mediator , downregulation and upregulation , cell , small interfering rna , transfection , immunology , biology , cell culture , gene , biochemistry , genetics , microbiology and biotechnology
BACKGROUND Herpesvirus entry mediator (HVEM) is known to regulate immune response and to be expressed in several human malignancies. However, to the authors's knowledge, the precise role of HVEM in human cancer biology remains unknown. The objective of the current study was to clarify the clinical significance of HVEM in human esophageal squamous cell carcinoma as well as its in vivo functions. METHODS HVEM expression was evaluated in 103 patients with esophageal squamous cell carcinoma to explore its clinical relevance and prognostic value. The functions of HVEM in tumors were analyzed in vitro and in vivo using the small interfering RNA (siRNA) silencing technique. RESULTS HVEM expression was found to be significantly correlated with depth of tumor invasion and lymph node metastasis. Furthermore, it was found to be inversely correlated with tumor‐infiltrating CD4 + , CD8 + , and CD45RO + lymphocytes. It is important to note that HVEM status was identified as an independent prognostic marker. HVEM gene silencing significantly inhibited cancer cell proliferation in vitro and cancer growth in vivo. This antitumor effect was associated with reduced cell proliferation activity. The effect was also correlated with the induction of CD8 + cells and upregulation of local immune response. CONCLUSIONS HVEM plays a critical role in both tumor progression and the evasion of host antitumor immune responses, possibly through direct and indirect mechanisms. Therefore, HVEM may be a promising therapeutic target for human esophageal cancer. Cancer 2014;120:808–817 . © 2013 American Cancer Society .