Overexpression of long noncoding RNA HOTTIP promotes tumor invasion and predicts poor prognosis in gastric cancer.
OBJECTIVE
Long noncoding RNAs have been proved to play important roles in the tumorigenesis and development of human gastric cancer (GC). Our study aims to investigate the expression and function of Homeobox A transcript at the distal tip (HOTTIP) in GC.


METHODS
HOTTIP expression was detected in GC tissues and cell lines by using quantitative reverse transcription polymerase chain reaction. Association between HOTTIP levels and clinicopathological factors and patient prognosis was also analyzed. MTT, flow cytometry, and transwell invasion and migration assays were used to investigate the role of HOTTIP in the regulation of biological behaviors of GC cells.


RESULTS
HOTTIP expression was remarkably increased in GC tissues and cell lines compared with that in the normal control. Clinicopathologic analysis revealed that high HOTTIP expression correlated with larger tumor size, deeper invasion depth, positive lymph node metastasis, advanced TNM stage, and shorter overall survival. Multivariate regression analysis identified HOTTIP overexpression as an independent unfavorable prognostic factor in GC patients. Moreover, HOTTIP downregulation by si-HOTTIP transfection impaired GC cell proliferation, promoted cell apoptosis, and reduced cell invasion and migration.


CONCLUSIONS
These findings suggested that HOTTIP may contribute to GC initiation and progression, and would be not only a novel prognostic marker but also a potential therapeutic target for this disease.
Department of Oncology, The Affiliated Hospital of Nanjing Medical University, Changzhou No 2 People's Hospital, Changzhou, Jiangsu, People's Republic of China.
Heng
H
Ye
Department of General Surgery, The Affiliated Hospital of Nanjing Medical University, Changzhou No 2 People's Hospital, Changzhou, Jiangsu, People's Republic of China.
Kun
K
Liu
Department of Oncology, The Affiliated Hospital of Nanjing Medical University, Changzhou No 2 People's Hospital, Changzhou, Jiangsu, People's Republic of China.
Keqing
K
Qian
HOTTIP; gastric cancer; long noncoding RNA; prognosis