Tumor Biology

, Volume 37, Issue 7, pp 9919–9930 | Cite as

SUSD2 is frequently downregulated and functions as a tumor suppressor in RCC and lung cancer

Original Article

Abstract

Sushi domain containing 2 (SUSD2) is type I membrane protein containing domains inherent to adhesion molecules. There have been few reported studies on SUSD2, and they have mainly focused on breast cancer, colon cancer, and HeLa cells. However, the expression and function of SUSD2 in other cancers remain unclear. In the present study, we conducted an integrated bioinformatics analysis based on the array data from the GEO database and found a significant downregulation of SUSD2 in renal cell carcinoma (RCC) and lung cancer. Western blotting and quantitative RT-PCR (qRT-PCR) confirmed that SUSD2 was frequently decreased in RCC and lung cancer tissues compared with the corresponding levels in normal adjacent tissues. The restoration of SUSD2 expression inhibited the proliferation and clonogenicity of RCC and lung cancer cells, whereas the knockdown of SUSD2 promoted A549 cell growth. Our findings suggested that SUSD2 functions as a tumor suppressor gene (TSG) in RCC and lung cancer.

Keywords

SUSD2 RCC Lung cancer Cell proliferation Tumor suppressor gene 

Abbreviations

AMOP

adhesion-associated domain present in MUC4 and other proteins

ARSs

average rank scores

BM-MSCs

bone marrow-derived mesenchymal stem/stromal cells

CCK8

cell counting kit-8

ccRCC

clear cell RCC

DEGs

differentially expressed genes

GEO

gene expression omnibus

GEPs

gene expression profiles

LCCs

large cell carcinomas

NSCLC

non-small-cell lung cancer

qRT-PCR

quantitative RT-PCR

RBE

rank-based gene expression

RCC

renal cell carcinoma

SCCs

squamous cell carcinomas

SCLC

small cell lung cancer

SUSD2

sushi domain containing 2

TSG

tumor suppressor gene

Notes

Acknowledgments

This work was supported by the Peking University-National Taiwan University Cooperation Fund (BMU20120316).

Compliance with ethical standards

Conflicts of interest

None

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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2016

Authors and Affiliations

  1. 1.Peking University Center for Human Disease Genomics, Department of Immunology, Key Laboratory of Medical Immunology, Ministry of Health, School of Basic Medical SciencesPeking University Health Science CenterBeijingChina
  2. 2.Department of UrologyPeking University People’s HospitalBeijingChina
  3. 3.Department of Thoracic SurgeryBeijing Haidian Hospital (Haidian Section of Peking University Third Hospital)BeijingPeople’s Republic of China
  4. 4.Department of Thoracic SurgeryPeking University People’s HospitalBeijingChina

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