LINC00657 promotes the development of colon cancer by activating PI3K/AKT pathway
Authors: J Bai
Y Lei
Y-H Wang
X-F Wang
Journal: European Review for Medical and Pharmacological Sciences (2018)
Discipline: PHARMACOLOGY & TOXICOLOGY
Keywords: LINC00657; cell proliferation; invasion; PI3K/AKT pathway; colon cancer
Affiliations: Department of Medical Oncology, Shaanxi Provincial People's Hospital, Xi'An, China. .

Abstract:  Objective: The aim of this study was to explore whether LINC00657 can regulate cell proliferation and invasion by regulating the PI3K/AKT pathway and thus participate in the occurrence of colon cancer. Patients and methods: Quantitative Real Time-Polymerase Chain Reaction (qRT-PCR) was applied to detect the expression levels of LINC00657 and E-cad in colon cancer tissues and corresponding adjacent tissues obtained from 80 patients, and the correlation was analyzed between LINC00657 expression and clinical information of patients such as prognosis, tumor size, tumor stage, and distant metastasis. The expression of LINC00657 and E-cad in colon cancer cell lines was also examined, and the effect of LINC00657 on tumor cell proliferation was evaluated by cell counting kit-8 (CCK-8) assay and colony formation experiments. Meanwhile, transwell assay was performed to evaluate the influence of LINC00657 and CAPN7 on cell invasive ability. In addition, the effect of LINC00657 on CAPN7 and PI3K/AKT pathway was detected by Western blot assay. Results: The expression levels of LINC00657 and E-cad in tumor tissues decreased remarkably, especially in patients who occurred distant metastasis. Compared with patients with highly-expressed LINC00657, the patients with lower level of LINC00657 had a worse prognosis and an advanced tumor size and TNM stage. Similarly, LINC00657 and E-cad also showed a decrease in colon cancer cell lines. After overexpression of LINC00657, cell viability and invasive ability decreased remarkably while cell apoptosis rate increased significantly. In addition, high expression of LINC00657 in an in vitro model significantly promoted CAPN7 expression and inhibited activation of PI3K/AKT pathway. Conclusions: LINC00657 had a low expression in colon cancer tissues, which could accelerate cell proliferation and invasion by activating PI3K/AKT pathway and inhibiting CAPN7 expression. 

Retracted: Yes

PubPeer comments:
  A total of 80 specimens were obtained from patients with colon cancer in Shaanxi Provincial Peopleu2019s Hospital from **November 2015 to September 2018** . Fig 1C.  Prognosis of patients with lowly expressed LINC00657 is poorer than those with highly expressed one . ![file] The authors recruited patients through a period of three years to a month before the paper was published. They followed patient survival through to 5000 days, i.e. **nearly 14 years**. Fig 1C reports 80 patients in each of the high- and low-LINC00657 groups, for comparison with the 80 patients recruited altogether, , 
 Retracted [March 2021] . ----------------------------------------------------- The article u201cLINC00657 promotes the development of colon cancer by activating PI3K AKT pathway, by Y. Lei, Y.-H. Wang, X.-F. Wang, J. Bai, published in Eur Rev Med Pharmacol Sci 2018; 22 (19): 6315-6323u2013DOI: 10.26355 eurrev_201810_16042u2013PMID: 30338799u201d has been withdrawn from the authors due to inaccuracies and mistakes throughout the paper. The Publisher apologizes for any inconvenience this may cause. ,