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Logo of bmccancBioMed Centralsearchsubmit a manuscriptregisterthis articleBMC Cancer
BMC Cancer. 2012; 12: 464.
Published online Oct 10, 2012. doi:  10.1186/1471-2407-12-464
PMCID: PMC3488331
Targeting SPARC by lentivirus-mediated RNA interference inhibits cervical cancer cell growth and metastasis
Jie Chen,#1 Dehuan Shi,#2 Xiaoyan Liu,2 Shuang Fang,3 Jie Zhang,corresponding author4 and Yueran Zhaocorresponding author4
1Department of Maternal and Child Health Care, School of Public Health, Shandong University, Jinan, 250012, China
2Department of Obstetrics and Gynecology, Qilu Hospital, Shandong University, Jinan, 250012, China
3Major of Clinical Medicine, Preclinical Medicine College, Taishan Medical University, Taian, 271000, China
4Central Laboratory, Shandong Provincial Hospital affiliated to Shandong University, Jinan, 250021, China
corresponding authorCorresponding author.
#Contributed equally.
Jie Chen: 77chenjie/at/; Dehuan Shi: shidh6699/at/; Xiaoyan Liu: rainxy777/at/; Shuang Fang: lanxiner-3162/at/; Jie Zhang: zhangjie19630711/at/; Yueran Zhao: yrzhao/at/
Received April 11, 2012; Accepted October 8, 2012.
Secreted protein acidic and rich in cysteine (SPARC), a calcium-binding matricellular glycoprotein, is implicated in the progressions of some cancers. However, no information has been available to date regarding the function of SPARC in cervical cancer cell growth and metastasis.
In this study, we isolated and established high invasive subclones and low invasive subclones from human cervical cancer cell lines HeLa and SiHa by the limited dilution method. Real-time q-RT-PCR, Western Blot and ICC were performed to investigate SPARC mRNA and protein expressions in high invasive subclones and low invasive subclones. Then lentivirus vector with SPARC shRNA was constructed and infected the highly invasive subclones. Real-time q-RT-PCR, Western Blot and ICC were also performed to investigate the changes of SPARC expression after viral infection. In functional assays, effects of SPARC knockdown on the biological behaviors of cervical cancer cells were investigated. The mechanisms of SPARC in cervical cancer proliferation, apoptosis and invasion were also researched.
SPARC was over-expressed in the highly invasive subclones compared with the low invasive subclones. Knockdown of SPARC significantly suppressed cervical cancer cell proliferation, and induced cell cycle arrest at the G1/G0 phase through the p53/p21 pathway, also caused cell apoptosis accompanied by the decreased ratio of Bcl-2/Bax, and inhibited cell invasion and metastasis accompanied by down-regulated MMP2 and MMP9 expressions and up-regulated E-cadherin expression.
SPARC is related to the invasive phenotype of cervical cancer cells. Knockdown of SPARC significantly suppresses cervical cancer cell proliferation, induces cell apoptosis and inhibits cell invasion and metastasis. SPARC as a promoter improves cervical cancer cell growth and metastasis.
Keywords: SPARC, Cervical cancer, Proliferation, Apoptosis, Metastasis
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