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Tumor Biology
Published in: Tumor Biology 6/2016

01-06-2016 | Original Article

The long noncoding RNA HOXA transcript at the distal tip promotes colorectal cancer growth partially via silencing of p21 expression

Authors: Yifan Lian, Jie Ding, Zhihong Zhang, Yongguo Shi, Ya Zhu, Juan Li, Peng Peng, Jirong Wang, Yingrui Fan, Wei De, Keming Wang

Published in: Tumor Biology | Issue 6/2016

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Abstract

Accumulating evidence strongly suggests that dysregulation of long noncoding RNAs (lncRNAs) is associated with human carcinogenesis. The lncRNA HOXA transcript at the distal tip (HOTTIP) is involved in the development of several cancers. However, the biological role of HOTTIP in colorectal cancer (CRC) has not yet been discussed. Here, we report that HOTTIP acts as a functional oncogene in the pathogenesis of CRC. In this study, quantitative polymerase chain reaction (qPCR) was performed to detect the expression of HOTTIP in 48 pairs of colorectal cancer samples. We found that overexpression of HOTTIP is correlated with an advanced pathological stage and a larger tumor size. Moreover, functional analyses revealed that the knockdown of HOTTIP expression by small interfering RNA (siRNA) or small hairpin RNA (shRNA) could inhibit cell proliferation and induce cell apoptosis. More importantly, we observed that HOTTIP knockdown induced a marked increase in the number of cells in the G0/G1 phase and a reduction in the number of cells in the S phase in both DLD-1 cells and SW480 cells. An in vivo experiment also revealed that the knockdown of HOTTIP inhibited tumor growth. Western blot and immunohistochemistry analyses indicated that HOTTIP potentially contributed to CRC cell growth partially through the silencing of p21 expression. Collectively, our results suggest that HOTTIP is involved in the progression of CRC and may provide evidence for HOTTIP being a target for therapy of this disease.
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Metadata
Title
The long noncoding RNA HOXA transcript at the distal tip promotes colorectal cancer growth partially via silencing of p21 expression
Authors
Yifan Lian
Jie Ding
Zhihong Zhang
Yongguo Shi
Ya Zhu
Juan Li
Peng Peng
Jirong Wang
Yingrui Fan
Wei De
Keming Wang
Publication date
01-06-2016
Publisher
Springer Netherlands
Published in
Tumor Biology / Issue 6/2016
Print ISSN: 1010-4283
Electronic ISSN: 1423-0380
DOI
https://doi.org/10.1007/s13277-015-4617-2

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