Volume 125, Issue 6 pp. 1316-1327
Cancer Cell Biology

Identification and characterization of a novel CXC chemokine in xenograft tumor induced by mas-overexpressing cells

Wen-Zhen Lin

Wen-Zhen Lin

Department of Biochemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

Department of Biochemistry and Molecular Biology, School of Pre-clinical Sciences, GuangXi Medical University, Nanning, GuangXi, China

The first two authors contributed equally to this work.

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Zhou-Fang Li

Zhou-Fang Li

Department of Biochemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

The first two authors contributed equally to this work.

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Sup-Yin Tsang

Sup-Yin Tsang

Department of Biochemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

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Lydia K.W. Lung

Lydia K.W. Lung

Department of Biochemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

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Da-Kui Wang

Da-Kui Wang

Department of Biochemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

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Wood-Yee Chan

Wood-Yee Chan

Department of Anatomy, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

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You-Kai Zhu

You-Kai Zhu

Department of Pathology, The People's Hospital of GuangXi Zhuang Autonomous Region, Nanning, GuangXi, China

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Susanna S.T. Lee

Susanna S.T. Lee

Department of Biochemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

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Wing-Tai Cheung

Corresponding Author

Wing-Tai Cheung

Department of Biochemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

Fax: +852-2603-7246.

Department of Biochemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, ChinaSearch for more papers by this author
First published: 14 July 2009
Citations: 2

Abstract

Overexpressions of G protein-coupled receptor (GPCR) with elevated downstream signaling events have been reported in various tumors. However, the cellular mechanism that GPCR overexpression leads to tumor formation is largely unknown. The orphan GPCR mas was originally isolated from a human epidermoid carcinoma. In vivo studies of mas-overexpressing cells suggested that xenograft tumor formation was positively correlated with the levels of mas expression. Histochemical analysis indicated that xenograft tumor consisted of mas-transfected and stromal cells. Biochemical analyses revealed that cells overexpressing mas exhibited significantly increased anchorage-independent growth, whereas there was no significant difference in cell proliferation in comparison with empty vector-transfected control cells. Expression profiling using mRNA differential display and Northern analysis indicated an elevated expression of GRO and a novel CXC chemokines, tumor-induced factor (TIF), in mas-transfected cells and xenograft tumor. Bacterially expressed recombinant TIF was found to act as a neutrophil chemoattractant in a chemotactic assay. These results suggest that mas overexpression enables anchorage-independent growth of transformed cells, and interplays of secreted chemokines with stromal cells modulate xenograft tumor formation. Importantly, a novel CXC chemokine, TIF, was identified in the xenograft tumor tissues. © 2009 UICC

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