Hui et al investigated the significance of miRNA in patients with locally advanced head and neck squamous cell carcinoma and identified that thirty-eight miRNAs were significantly differentially expressed between malignant versus normal tissues [6]. Of note, upregulation of miR-106b, miR-423, miR-20a, and miR-16 as well as downregulation of miR-10a were newly observed. In present work, we determined the function of miR-106b involved in laryngeal carcinoma.

Reduction of miR-106b by antisense oligonucleotides inhibited cell proliferation and induced cell cycle G0/G1 arrest in laryngeal carcinoma cells. Moreover, RB was a direct target of miR-106b by luciferase reporter assay. Introduction of RB cDNA without 3′UTR abrogated miR-106b-induced cell proliferation. Finally, selleck there was an inverse correlation of expression of miR-106b and RB in laryngeal carcinoma tissues. Materials and methods Clinical sample collection Twenty laryngeal carcinoma tissues used in this study were obtained from Taizhou People’s Hospital

in China. Specimens were snap-frozen in liquid nitrogen, incuding 10 laryngeal carcinomas with stage I and II, and 10 laryngeal carcinomas with stage III and IV. The collection and use of the patient samples were reviewed and approved by Institutional Ethics Committees, and written informed consent from all patients was appropriately obtained. Cell culture and selleck screening library transfection Hep-2 and TU212 cells were check details purchased from Chinese Academy of Sciences Cell Bank. Cells were maintained in DMEM medium supplemented with 10% fetal bovine serum. Cells were transfected using learn more Lipofectamine

2000 (Invitrogen, USA) at the time of 50-60% confluent. 48 h after transfection, cells were harvested for further studies. Plasmids and oligonucleotides For expression plasmid construct, wild-type RB cDNA sequence without 3′UTR was selected and cloned into Pgenesil-1 vector. 2′-O-methyl (OMe)-oligonucleotides were chemically synthesized and purified by GenePharma Co., Ltd. (Shanghai, China). The amount of oligonucleotides transfected was 50 nmol/L. Sequences as follows: miR-106b, 5′- UAAAGUGCUGACAGUGCAGAU-3′; anti-miR-106b (As-miR-106b), 5′-AUCUGCACUGUCAGCACUUUA-3′; scrambled miRNA (negative control), 5′-UUGUACUACACAAAAGUACUG-3′. Real time PCR Trizol reagent was used to isolate total RNA from cells 48 h after transfection. The RT-real-time PCR was carried out with the miRNA detection kit (Ambion, USA). Amplification reaction protocol was performed for 40 cycles consisting 95°C for 3 min, 95°C for 15 sec, 60°C for 30 sec. Both RT and PCR primer were purchased from Ambion. 5S RNA was used for normalization. Relative quantification was conducted using amplification efficiencies derived from cDNA standard curves and obtained relative gene expression. Relative gene expression was calculated via a 2ΔΔCt method.