ABSTRACT
Objective The objective of this study was to investigate the relationship between serum long-chain non-cod-ing RNA MALAT1 and AFAP1-AS1 and clinicopathological features,and prognosis of nasopharyngeal carcinoma(NPC). Methods A total of 136 patients with nasopharyngeal carcinoma confirmed by pathology in our hospital were selected from April 2013 to June 2015. During the same time,54 outpatients for health examination in our hospital were selected as the control group and nasopharynge-al carcinoma group. Real-time fluorescence reverse transcription analysis was used to analyze the expression of lncRNA MALAT1 and AFP1-AS1. The relationship between the expression of lncRNA MALAT1 and AFP1-AS1,and clinicopathological characteris-tics was analyzed by χ2 test. Log-rank assay was used to analyze serum long-chain non-coding RNA MALAT1 and prognostic differences in patients with different expression levels of AFAP1-AS1. Results Compared with the control group,the serum levels of RNA MALAT1 and RNA AFAP1-AS1 in the nasopharyngeal carcinoma group were significantly increased(P<0. 001);The expres-sions of lncRNA MALAT1 and AFAP1-AS1 was not related to age(P>0. 05);The maximum diameter of the tumor was≥5 cm,the pathological stage was higher,the TNM stage was higher,the deeper in the infiltration depth,the infiltration of lymphatic vessels,the lymph node metastasis,and the recurrence and the higher in high expressive rates of lncRNA MALAT1 and AFAP1 -AS1 ( P <0. 05). The 2-year survival rate and survival time of lncRNA MALAT1 and AFAP1-AS1 in the low expression group were signifi-cantly higher than those of the high expression group(P<0. 001);Multivariate Cox stepwise regression analysis showed that low ex-pression of lncRNA MALAT1(HR=0. 52,95% CI:0. 37~0. 81)and low expression of lncRNA AFAP1-AS1(HR=0. 56,95% CI:0. 51~0. 83)were independent prognostic protective factors for NPC patients(P<0. 001). Conclusion The serum long-chain non-coding RNA MALAT1 and AFAP1-AS1 are elevated in patients with NPC,and are positively correlated with malignant progression of NPC. NPC patients with low expression of lncRNA MALAT1 and AFAP1-AS1 serum have a good prognosis;MALAT1 and AFAP1 -AS1 can be used as new markers for the diagnosis of nasopharyngeal carcinoma.
ABSTRACT
BACKGROUND AND OBJECTIVE: Long non-coding RNAs can regulate tumorigenesis of various cancers. Dys-regulation of lncRNA-AFAP1-AS1 has not been studied in colorectal carcinoma (CRC). This study was to examine the function involvement of AFAP1-AS1 in tumor growth and metastasis of CRC. METHODS: Relative expression of AFAP1-AS1 in CRC tissues and CRC cells lines was determined using quantitative real-time PCR (qRT-PCR). Functional involvement of AFAP1-AS1 in tumor proliferation and metastasis was evaluated in AFAP1-AS1-specific siRNA-treated CRC cells and in CRC cell xenograft. Expression of epithelial-mesenchymal transition (EMT)-related gene expression was determined using western blot. RESULTS: Relative expression of AFAP1-AS1 was significantly elevated in CRC tissues and CRC HCT116 and SW480 cell lines. AFAP1-AS1 knock-down suppressed SW480 cell proliferation, colony formation, migration and invasion. Also AFAP1-AS1 knock-down inhibited tumor metastasis-associated genes expression in terms of EMT. This carcinostatic action by AFAP1-AS1 knock-down was further confirmed by suppression of tumor formation and hepatic metastasis of CRC cells in nude mice. CONCLUSION: lncRNA-AFAP1-AS1 knock-down exhibits antitumor effect on colorectal carcinoma in respects of suppression of cell proliferation and metastasis of cancer cells.