title: Long intergenic noncoding RNA HOTAIR is overexpressed and regulates PTEN methylation in laryngeal squamous cell carcinoma.
abstract: Homeobox (HOX) transcript antisense RNA (HOTAIR) is a long intergenic noncoding RNA (lincRNA) that is significantly overexpressed in breast and hepatocellular cancers. It remains unclear, however, whether HOTAIR plays an oncogenic role in human laryngeal squamous cell cancer (LSCC). We therefore investigated the expression and functional role of HOTAIR in LSCC. HOTAIR levels were significantly higher in LSCC than in corresponding adjacent non-neoplastic tissues, and patients with poor histological grade or advanced clinical stage had higher HOTAIR expression. Log-rank test showed a significant association between high levels of HOTAIR and poor prognosis in LSCC patients. Multivariate Cox analysis suggested that HOTAIR is an independent prognostic factor of LSCC. siRNA-mediated knockdown of HOTAIR led to reduced invasion and increased apoptosis of Hep-2 cells in vitro and significantly reduced growth of LSCC xenograft tumors in mice. Moreover, PTEN methylation was significantly reduced in Hep-2 cells depleted of HOTAIR. Taken together, these results suggest that the oncogenic role of HOTAIR in LSCC is related to promotion of PTEN methylation. HOTAIR could serve as a marker for LSCC prognosis and a potential target for therapeutic intervention.
authors.affiliation: Department of Otorhinolaryngology, Head and Neck Surgery, The Second Affiliated Hospital, Harbin Medical University, Harbin, China.
authors.forename: Dandan
authors.initials: D
authors.lastname: Li
authors.forename: Jiapeng
authors.initials: J
authors.lastname: Feng
authors.forename: Tianyi
authors.initials: T
authors.lastname: Wu
authors.forename: Yandong
authors.initials: Y
authors.lastname: Wang
authors.forename: Yanan
authors.initials: Y
authors.lastname: Sun
authors.forename: Jingyuan
authors.initials: J
authors.lastname: Ren
authors.forename: Ming
authors.initials: M
authors.lastname: Liu
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000235:genetics; D014408:Biomarkers, Tumor / Q000096:biosynthesis / Q000235:genetics; D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D019175:DNA Methylation / Q000235:genetics; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics; D055785:Gene Knockdown Techniques; D052138:Genes, Neoplasm; D006801:Humans; D007822:Laryngeal Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009368:Neoplasm Transplantation; D051059:PTEN Phosphohydrolase / Q000235:genetics* / Q000378:metabolism; D011379:Prognosis; D062085:RNA, Long Noncoding / Q000096:biosynthesis* / Q000235:genetics; D012334:RNA, Neoplasm / Q000235:genetics; D014183:Transplantation, Heterologous; D014407:Tumor Cells, Cultured
chemical_list: D014408:Biomarkers, Tumor; D004273:DNA, Neoplasm; C561566:HOTAIR long untranslated RNA, human; D062085:RNA, Long Noncoding; D012334:RNA, Neoplasm; D051059:PTEN Phosphohydrolase; C494929:PTEN protein, human