Journal Article

PAQR3 Plays a Suppressive Role in the Tumorigenesis of Colorectal Cancers

Xiao Wang, Xuebing Li, Fengjuan Fan, Shi Jiao, Lingdi Wang, Lu Zhu, Yi Pan, Guohao Wu, Zhi-Qiang Ling, Jing Fang and Yan Chen

in Carcinogenesis

Volume 33, issue 11, pages 2228-2235
Published in print November 2012 | ISSN: 0143-3334
Published online July 2012 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/bgs245
PAQR3 Plays a Suppressive Role in the Tumorigenesis of Colorectal Cancers

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PAQR3 is a member of the progestin and adipoQ receptor (PAQR) family and was recently characterized as a spatial regulator that negatively modulates Ras/Raf/MEK/ERK signaling cascade. However, little is known about the physiological functions of PAQR3 in the tumorigenesis of colorectal cancers. The function of PAQR3 in colorectal cancer development in mice was analyzed by crossing Paqr3-depleted mice with ApcMin/+ mice that have a germline mutation of the gene-encoding tumor suppressor adenomatous polyposis coli (APC). The survival time and tumor area in the small intestine of the ApcMin/+ mice was significantly aggravated by Paqr3 deletion. The cell proliferation rate, anchorage-independent growth, EGF-stimulated ERK phosphorylation and EGF-induced nuclear accumulation of β-catenin were inhibited by PAQR3 overexpression and enhanced by PAQR3 knockdown in SW-480 colorectal cancer cells. In humans, the expression level of PAQR3 was significantly decreased in colorectal cancer samples in comparison with adjacent normal tissues. In addition, the expression level of PAQR3 was inversely associated with tumor grade in the colorectal cancer samples. Collectively, our data reveal for the first time that PAQR3 has a tumor suppressor activity in the development of colorectal cancers.

Journal Article.  4164 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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