title: CIZ1 regulates the proliferation, cycle distribution and colony formation of RKO human colorectal cancer cells.
abstract: Cip1-interacting zinc finger protein 1 (CIZ1) is a nuclear protein that was observed to bind to p21Cip1/Waf1. p21Cip1/Waf1 regulates the cell cycle and is associated with colorectal cancer (CRC) progression. However, the effect of CIZ1 on CRC cells remains unclear. In the present study, CIZ1 was observed to be highly expressed in RKO human CRC cells. Silencing of CIZ1 using small interfering RNA (siRNA) suppressed RKO cell proliferation. Flow cytometric analysis demonstrated that knockdown of CIZ1 decreased the percentage of cells in the S phase and increased the ratio of cells in the G0/G1 phase in parallel with upregulated cell apoptosis. Moreover, the number and size of RKO cell colonies was repressed by knockdown of the CIZ1 gene. These results suggested that CIZ1 may be involved in colon cancer progression by regulating cell proliferation, cell cycle, apoptosis and colony formation. Furthermore, CIZ1‑siRNA may provide a novel tool for CRC investigation and therapy.
authors.affiliation: Institute of Basic Medical Sciences, Qilu Hospital, Shandong University, Jinan, Shandong 250012, P.R. China.
authors.forename: Jing
authors.initials: J
authors.lastname: Yin
authors.forename: Changliang
authors.initials: C
authors.lastname: Wang
authors.forename: Xiaoyong
authors.initials: X
authors.lastname: Tang
authors.forename: Huaibin
authors.initials: H
authors.lastname: Sun
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Shao
authors.forename: Xigui
authors.initials: X
authors.lastname: Yang
authors.forename: Xun
authors.initials: X
authors.lastname: Qu
mesh_terms: D017209:Apoptosis; D002453:Cell Cycle / Q000235:genetics; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D015179:Colorectal Neoplasms / Q000235:genetics / Q000473:pathology*; D015972:Gene Expression Regulation, Neoplastic; D055785:Gene Knockdown Techniques; D006801:Humans; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D034741:RNA, Small Interfering / Q000378:metabolism; D014410:Tumor Stem Cell Assay
chemical_list: C400423:Ciz1 protein, human; D009687:Nuclear Proteins; D034741:RNA, Small Interfering
keywords: Cip1  interacting  zinc  finger  protein; colorectal  cancer  cells; proliferation; apoptosis