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Cancer Cell International
Published in: Cancer Cell International 1/2017

Open Access 01-12-2017 | Primary Research

Repression of GPRC5A is associated with activated STAT3, which contributes to tumor progression of head and neck squamous cell carcinoma

Authors: Shuli Liu, Dongxia Ye, Tong Wang, Wenzheng Guo, Hongyong Song, Yueling Liao, Dongliang Xu, Hanguang Zhu, Zhiyuan Zhang, Jiong Deng

Published in: Cancer Cell International | Issue 1/2017

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Abstract

Background

G protein–coupled receptor family C group 5 member A (GPRC5A), a retinoic acid-inducible gene, is a lung tumor suppressor. Previously, we showed that repression of GPRC5A expression was associated with pathologic differentiation grade of oral squamous cell carcinomas (OSCC) and overexpression of GPRC5A gene inhibited the malignant phenotype in OSCC cells, suggesting that GPRC5A also functions as a tumor suppressor in oral cancer. However, the molecular mechanisms underlying GPRC5A deficiency in head and neck squamous cell carcinoma (HNSCC) are still unclear.

Methods

In this study, we used Western blot analysis and immunohistochemical (IHC) staining to investigate the expression of GPRC5A in both HNSCC cell lines and clinical samples. GPRC5A stable transfectants and their parental HNSCC cells were characterized for their biological activities in anchorage-independent growth.

Results

IHC analysis showed that, GPRC5A expression was high in normal tissue, but gradually decreased in oral leukoplakia, a precancerous stage, and greatly suppressed in primary cancer. Repression of GPRC5A was correlated with activated STAT3, which associates with aggressive clinicopathological features in HNSCC patients. Moreover, overexpression of GPRC5A suppressed IL-6-induced-STAT3 activation and inhibited anchorage-independent growth in HNSCC cells.

Conclusions

Repressed GPRC5A associates with increased tumor grade and activated STAT3, which may be used as a prognostic marker for tumor progression of HNSCC.
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Metadata
Title
Repression of GPRC5A is associated with activated STAT3, which contributes to tumor progression of head and neck squamous cell carcinoma
Authors
Shuli Liu
Dongxia Ye
Tong Wang
Wenzheng Guo
Hongyong Song
Yueling Liao
Dongliang Xu
Hanguang Zhu
Zhiyuan Zhang
Jiong Deng
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Cancer Cell International / Issue 1/2017
Electronic ISSN: 1475-2867
DOI
https://doi.org/10.1186/s12935-017-0406-x

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