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A novel long non-coding RNA from the HOXA6-HOXA5 locus facilitates colon cancer cell growth

Homeobox A5 (HOXA5), a member of the HOX family, plays an important role in tumor development and morphogenesis, although opposite effects on tumorigenesis have been observed, depending on the tissue type. In this study, we aimed to investigate the role of a novel transcript from the HOXA6-HOXA5 loc...

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Published in:BMC cancer 2019-06, Vol.19 (1), p.532-532, Article 532
Main Authors: Saijo, Saki, Kuwano, Yuki, Tange, Shoichiro, Rokutan, Kazuhito, Nishida, Kensei
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description Homeobox A5 (HOXA5), a member of the HOX family, plays an important role in tumor development and morphogenesis, although opposite effects on tumorigenesis have been observed, depending on the tissue type. In this study, we aimed to investigate the role of a novel transcript from the HOXA6-HOXA5 locus in colon cancer tumorigenesis. Human colon cancer cell lines were analyzed using next generation sequencing-based targeted mRNA capture. The effects of overexpression and silencing of HOXA5 transcripts were evaluated in vitro and using a xenograft nude mouse model. We identified three novel transcripts (HOXA5 short, long 1, and long 2) transcribed from the HOXA6-HOXA5 locus in HCT116 colon cancer cells using next generation sequencing-based targeted mRNA capture. Knockdown of HOXA5 long 1 and long 2 transcripts did not affect cell growth, while selective silencing of HOXA5 short RNA inhibited cell growth independent of HOXA5 expression. Stable overexpression of HOXA5 short RNA promoted proliferation and migration of colon cancer cell lines HCT116, DLD1, and HT-29 and accelerated tumor growth in the xenograft mouse model. In vitro translation assays suggested HOXA5 short RNA was a functional long non-coding RNA (lncRNA). Consistent with these observations, expression of HOXA5 short RNA was upregulated in advanced colon cancer tissues. Ingenuity Pathway Analysis of differentially expressed genes between HOXA5 short RNA overexpressed and silenced HCT116 cells revealed that HOXA5 short RNA preferentially modified expression of epidermal growth factor (EGF) signal-related genes. Western blot analysis demonstrated that stable overexpression of HOXA5 short RNA increased EGF receptor levels and facilitated its phosphorylation in both HCT116 cells and xenograft tumors. Our results suggested that HOXA5 short RNA, a novel lncRNA, may play a crucial role in colon tumor growth through activation of EGF signaling.
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In vitro translation assays suggested HOXA5 short RNA was a functional long non-coding RNA (lncRNA). Consistent with these observations, expression of HOXA5 short RNA was upregulated in advanced colon cancer tissues. Ingenuity Pathway Analysis of differentially expressed genes between HOXA5 short RNA overexpressed and silenced HCT116 cells revealed that HOXA5 short RNA preferentially modified expression of epidermal growth factor (EGF) signal-related genes. Western blot analysis demonstrated that stable overexpression of HOXA5 short RNA increased EGF receptor levels and facilitated its phosphorylation in both HCT116 cells and xenograft tumors. 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In this study, we aimed to investigate the role of a novel transcript from the HOXA6-HOXA5 locus in colon cancer tumorigenesis. Human colon cancer cell lines were analyzed using next generation sequencing-based targeted mRNA capture. The effects of overexpression and silencing of HOXA5 transcripts were evaluated in vitro and using a xenograft nude mouse model. We identified three novel transcripts (HOXA5 short, long 1, and long 2) transcribed from the HOXA6-HOXA5 locus in HCT116 colon cancer cells using next generation sequencing-based targeted mRNA capture. Knockdown of HOXA5 long 1 and long 2 transcripts did not affect cell growth, while selective silencing of HOXA5 short RNA inhibited cell growth independent of HOXA5 expression. Stable overexpression of HOXA5 short RNA promoted proliferation and migration of colon cancer cell lines HCT116, DLD1, and HT-29 and accelerated tumor growth in the xenograft mouse model. In vitro translation assays suggested HOXA5 short RNA was a functional long non-coding RNA (lncRNA). Consistent with these observations, expression of HOXA5 short RNA was upregulated in advanced colon cancer tissues. Ingenuity Pathway Analysis of differentially expressed genes between HOXA5 short RNA overexpressed and silenced HCT116 cells revealed that HOXA5 short RNA preferentially modified expression of epidermal growth factor (EGF) signal-related genes. Western blot analysis demonstrated that stable overexpression of HOXA5 short RNA increased EGF receptor levels and facilitated its phosphorylation in both HCT116 cells and xenograft tumors. Our results suggested that HOXA5 short RNA, a novel lncRNA, may play a crucial role in colon tumor growth through activation of EGF signaling.</abstract><cop>England</cop><pub>BioMed Central Ltd</pub><pmid>31159758</pmid><doi>10.1186/s12885-019-5715-0</doi><tpages>1</tpages><orcidid>https://orcid.org/0000-0003-2314-785X</orcidid><oa>free_for_read</oa></addata></record>
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subjects Animals
Breast cancer
Cancer cells
Carcinogenesis
Carcinogenesis - genetics
Cell migration
Cell Movement
Cell Proliferation
Colon cancer
Colonic Neoplasms - genetics
Colonic Neoplasms - pathology
Colorectal cancer
Deoxyribonucleic acid
DNA
Epidermal growth factor
Epidermal Growth Factor - genetics
Epidermal Growth Factor - metabolism
Epidermal growth factor signaling
Epidermal growth factors
ErbB Receptors - metabolism
Estrogens
Gastrointestinal diseases
Gene expression
Gene Expression Regulation, Neoplastic
Gene Knockdown Techniques
Gene loci
Gene Silencing
Genes
Genes, Homeobox - physiology
Genetic aspects
Genomics
HCT116 Cells
Homeobox
Homeodomain Proteins - genetics
HOXA5
HT29 Cells
Humans
Laboratories
Messenger RNA
Mice
Mice, Nude
Morphogenesis
Next-generation sequencing
Non-coding RNA
Novels
Phosphoproteins
Phosphorylation
RNA
RNA, Long Noncoding - metabolism
RNA-mediated interference
Transcription
Transcription (Genetics)
Tumor cell lines
Tumorigenesis
Tumors
Xenograft Model Antitumor Assays
Xenografts
title A novel long non-coding RNA from the HOXA6-HOXA5 locus facilitates colon cancer cell growth
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