Objective:To investigate the effects of long non coding RNA KCNQ1OT1(LncRNA KCNQ1OT1)on the migration and invasion of oral squamous cell carcinoma(OSCC)cells by regulating the microRNA-875-5p(miR-875-5p)/ETS like transcription factor 4(ELK4)axis.Methods:QRT-PCR was applied to detect the mRNA levels of LncRNA KCNQ1OT1,miR-875-5p,and ELK4 in OSCC cell lines(HSC-3,PE/CA-PJ15,HN13)and tissues.The dual luciferase assay was applied to detect the targeting relationship between LncRNA KCNQ1OT1 and miR-875-5p,and target relationship between miR-875-5p and ELK4.HSC-3 cells were used in control group,sh-NC group,sh-KCNQ1OT1 group,sh-KCNQ1OT1+anti-NC group,sh-KCNQ1OT1+anti-miR-875-5p group,miR-NC group,miR-875-5p mimic group,miR-875-5p mimic+pcDNA-NC group,and miR-875-5p mimic+ELK4 group.The migration and invasion abilities of HSC-3 cells were detected.Immunoblotting was applied to detect the protein expression of ELK4,MMP-2,MMP-9 and epithelial mesenchymal transition(EMT)(E-Cadherin,N-Cadherin,Vimentin).The nude mouse transplant tumor was applied to verify the effect of LncRNA KCNQ1OT1 on OSCC transplant tumors.Results:LncRNA KCNQ1OT1 and ELK4 mRNA expression increased in OSCC tissues and cancer cell lines,while miR-875-5p expression decreased(P＜0.05).Database predictions show that miR-875-5p specifically bound to LncRNAs KCNQ1OT1 and ELK4,respectively.Compared with the sh-NC group,the numbers of cell migration and cell invasion,the expression of LncRNA KCNQ1OT1,ELK4,MMP-2,MMP-9,N-Cadherin,and Vimentin in the sh-KC-NQ1OT1 group were lower,while the expression of miR-875-5p and E-Cadherin was higher(P＜0.05).Compared with the sh-KC-NQ1OT1+anti-NC group,the expression of miR-875-5p and E-Cadherin in the sh-KCNQ1OT1+anti-miR-875-5p group was lower,while the numbers of cell migration and cell invasion,the expression of ELK4,MMP-2,MMP-9,N-Cadherin,and Vimentin were higher(P＜0.05).Compared with the miR-NC group,the expression of miR-875-5p and E-Cadherin in the miR-875-5p mimic group was higher,while the numbers of cell migration and cell invasion,the expression of ELK4,MMP-2,MMP-9,N-Cadherin,and Vim-entin were lower(P＜0.05).Compared with the miR-875-5p mimic+pcDNA-NC group,the numbers of cell migration and cell inva-sion,the expression of ELK4,MMP-2,MMP-9,N-Cadherin,and Vimentin in the miR-875-5p mimic+ELK4 group were higher,while the expression of E-Cadherin was lower(P＜0.05).The transplant tumor volume and weight of the sh-KCNQ1OT1 group were smaller than those of the sh-NC group,the mRNA and protein expression levels of LncRNA KCNQ1OT1,ELK4 were lower than those of the sh-NC group,and the expression level of miR-875-5p was higher than that of the sh-NC group(P＜0.05).Conclusion:Inhibition of LncRNA KCNQ1OT1 can target the miR-875-5p/ELK4 axis to inhibit migration,invasion,and EMT of OSCC cells.

Objective:To investigate the effects of long non coding RNA KCNQ1OT1(LncRNA KCNQ1OT1)on the migration and invasion of oral squamous cell carcinoma(OSCC)cells by regulating the microRNA-875-5p(miR-875-5p)/ETS like transcription factor 4(ELK4)axis.Methods:QRT-PCR was applied to detect the mRNA levels of LncRNA KCNQ1OT1,miR-875-5p,and ELK4 in OSCC cell lines(HSC-3,PE/CA-PJ15,HN13)and tissues.The dual luciferase assay was applied to detect the targeting relationship between LncRNA KCNQ1OT1 and miR-875-5p,and target relationship between miR-875-5p and ELK4.HSC-3 cells were used in control group,sh-NC group,sh-KCNQ1OT1 group,sh-KCNQ1OT1+anti-NC group,sh-KCNQ1OT1+anti-miR-875-5p group,miR-NC group,miR-875-5p mimic group,miR-875-5p mimic+pcDNA-NC group,and miR-875-5p mimic+ELK4 group.The migration and invasion abilities of HSC-3 cells were detected.Immunoblotting was applied to detect the protein expression of ELK4,MMP-2,MMP-9 and epithelial mesenchymal transition(EMT)(E-Cadherin,N-Cadherin,Vimentin).The nude mouse transplant tumor was applied to verify the effect of LncRNA KCNQ1OT1 on OSCC transplant tumors.Results:LncRNA KCNQ1OT1 and ELK4 mRNA expression increased in OSCC tissues and cancer cell lines,while miR-875-5p expression decreased(P＜0.05).Database predictions show that miR-875-5p specifically bound to LncRNAs KCNQ1OT1 and ELK4,respectively.Compared with the sh-NC group,the numbers of cell migration and cell invasion,the expression of LncRNA KCNQ1OT1,ELK4,MMP-2,MMP-9,N-Cadherin,and Vimentin in the sh-KC-NQ1OT1 group were lower,while the expression of miR-875-5p and E-Cadherin was higher(P＜0.05).Compared with the sh-KC-NQ1OT1+anti-NC group,the expression of miR-875-5p and E-Cadherin in the sh-KCNQ1OT1+anti-miR-875-5p group was lower,while the numbers of cell migration and cell invasion,the expression of ELK4,MMP-2,MMP-9,N-Cadherin,and Vimentin were higher(P＜0.05).Compared with the miR-NC group,the expression of miR-875-5p and E-Cadherin in the miR-875-5p mimic group was higher,while the numbers of cell migration and cell invasion,the expression of ELK4,MMP-2,MMP-9,N-Cadherin,and Vim-entin were lower(P＜0.05).Compared with the miR-875-5p mimic+pcDNA-NC group,the numbers of cell migration and cell inva-sion,the expression of ELK4,MMP-2,MMP-9,N-Cadherin,and Vimentin in the miR-875-5p mimic+ELK4 group were higher,while the expression of E-Cadherin was lower(P＜0.05).The transplant tumor volume and weight of the sh-KCNQ1OT1 group were smaller than those of the sh-NC group,the mRNA and protein expression levels of LncRNA KCNQ1OT1,ELK4 were lower than those of the sh-NC group,and the expression level of miR-875-5p was higher than that of the sh-NC group(P＜0.05).Conclusion:Inhibition of LncRNA KCNQ1OT1 can target the miR-875-5p/ELK4 axis to inhibit migration,invasion,and EMT of OSCC cells.

Objective To evaluate the change of clinicopathological features and prognosis of papillary thyroid cancer over a 15-year period.Methods The clinicopathological features and outcomes of papillary thyroid cancer patients were analyzed in three groups according to the time of diagnosis:group Ⅰ (1997-2001),group Ⅱ (2002-2006),and group Ⅲ (2007-2011).Results As time advanced,the average age of papillary thyroid cancer patients increased,tumor stage,like size,extrathyroid invasion and lymph node metastasis decreased dramatically (P ＜ 0.01).The percentage of multifocality and bilaterality increased.The long-term follow up data (median follow up time was 6.6 years),indicated that the 15-year over all survival was 97.8％ and the 15-year disease-free survival was 90.2％.Tumor ≥3 cm,bilaterality,extrathyroid invasion,lymph node metastasis and AJCC stage were correlated with tumor recurrence.By multivariate COX-regression analysis only lymph node metastasis and bilaterality were independent risk factors.Conclusion The clinicopathological features of papillary thyroid cancer changed over 15 years,with the percentage of early-staged patients increased.Lymph node metastasis and bilaterality are two risk factors for tumor recurrence.

BACKGROUND:It has been demonstrated that shortening of femoral eccentricity would lead to decreased abductor muscle strength,and overlengthening eccentricity would increase the risk of femoral neck prosthesis fracture and the compressive stress of cemented femoral stem prosthesis after artificial hip replacement,which easily causes prosthetic loosening and subsidence.OBJECTIVE:To investigate the importance of eccentricity adjustment in the artificial hip replacement for treatment of femoral neck fracture in elderly patients.DESIGN,TIME AND SETTING:An observational study was performed at the Department of Orthopedics,First Affiliated Hospital of Tianjin University of Traditional Chinese Medicine between January 2004 and December 2005.PARTICIPANTS:A total of 30 patients with femoral neck fracture,12 males and 18 females,averaging 73.8 years of age (range 62-90 years old),received treatment at the Department of Orthopedics,First Affiliated Hospital of Tianjin University of Traditional Chinese Medicine and were recruited into this study.METHODS:All patients underwent artificial hip replacement operated by the same team of surgeons.Prior to surgery,some indices on the uninjured side were determined through the anteroposterior radiographs of pelvis using X-Caliper measurement tool,including rotation center of femoral head,rotation center of hip joint,collodiaphyseal angle,femoral transverse eccentricity,abduction moment arm,and moment arm of gravity.These indices were precisely calculated using trigonometric function.The angle of osteotomy plane was determined.Proper prosthesis was selected and eccentricity was adjusted.Following artificial hip placement,a comparison was made between uninjured and injured sides.MAIN OUTCOME MEASURES:Eccentricity and hip joint function.RESULTS:The eccentricity on uninjured side of 30 patients averaged 38.7 mm (range 22-57 mm) prior to surgery and that on the injured side averaged 39.2 mm (range 21-59 mm) after surgery.Limb discrepancy ranged 1.8-8.7 mm,with a mean of 3.4 mm,after surgery.There were 26 patients (86.7%) presenting long limbs and 4 patients (13.3%) showing short limbs after surgery.All patients were followed-up 0.5-2.5 years old.Harris hip score results were excellent in 10 patients,good in 19 patients,and fair in 1 patient,with an excellent and good rate of 97%.CONCLUSION:In treatment of femoral neck fracture,eccentricity adjustment during artificial hip replacement is closely associated with hip joint function after surgery.