ABSTRACT
Objective:To evaluate the effect of miR-216a-5p on the radiosensitivity of liver cancer cells via targeting Krüppel-like transcription factors 12 (KLF12).Methods:Real-time reverse transcription PCR (RT-qPCR) was used to detect miR-216a-5p, KLF12 mRNA levels in normal human liver cells L-02 cells, and human hepatoma cells Huh7, HepG2, Hep3B and MHCC-97H cell lines. HepG2 cells were divided into 0, 2, 4, 6 and 8 Gy irradiation groups, and miR-216a-5p, KLF12 mRNA levels were compared among different groups. HepG2 cells overexpressing miR-216a-5p and / or KLF12 were constructed by plasmid transfection and divided into the miR-NC group (control group), miR-216a-5p group, miR-216a-5p+NC group, miR-216a-5p+KLF12 group, IR+miR-NC group, IR+miR-216a-5p group, IR+miR-216a-5p+NC group, IR+miR-216a-5p+KLF12 group, respectively. miR-216a-5p, KLF12 mRNA levels were compared among different groups. Clone formation assay was used to detect cell radiosensitivity. CCK-8 assay was employed to detect cell proliferation ability. Flow cytometry was adopted to detect cell apoptosis. Single factor ANOVA was used for inter group comparisons. LSD- t test was used for pairwise comparison. Results:Compared with L-02 cells, KLF12 mRNA levels were up-regulated, whereas miR-216a-5p levels were down-regulated in liver cancer cell lines (all P<0.05). Compared with 0 Gy group, KLF12 mRNA levels were down-regulated, whereas miR-216a-5p levels were up-regulated in 2, 4, 6, and 8 Gy groups (all P<0.05). Overexpression of miR-216a-5p or radiation therapy alone could enhance cell radiosensitivity and apoptosis levels, and reduce cell proliferation ability (all P<0.05). Simultaneous radiation treatment with overexpression of miR-216a-5p exerted more significant effects on cells (all P<0.05). Overexpression of KLF12 could partially reverse the aforementioned effects of overexpression of miR-216a-5p ( P<0.05). Conclusion:MiR-216a-5p reduces cell proliferation ability, enhances cell radiosensitivity and apoptosis via regulating KLF12.
ABSTRACT
Objective To observe the changes of carotid intima-media thickness(CIMT) and vascular endothelia function in patients with geriatric carotid plaque before and after intensive lipid lowering was performed.Methods 102 patients diagnosed with carotid plaque were ramdomly divided into common group (atorvastatin 10 mg/d,n=48) and intensive lipid lowering group (atorvastatin 20 mg/d,n=54).After one year of treatment,the fasting venous blood total cholesterol (TC),low density lipoprotein cholesterol (LDL-C),high density lipeprotein cholesterol (HDL-C) and triglyceride (TG) were assayed,and the thickest and thinnest CIMT and brachial arterial.endothelium dependent diastolic function (FMD) and carotid artery plaque index(PI) were measured by ultrasound.Results Two groups in the thickest CIMT and PI had no significant difference before and after treatment (P＞0.05).The levels of FMD,TC,LDL-C,TG and the thinnest CIMT had significant difference before and after therapy [common group:GIMT(0.85±0.20)mm,(0.83±0.22) mm,FMD(3.85±1.41)%,(7.91±1.05)%,TC(6.46±1.05) mmol/L,(4.82±1.26) mmol/L,LDL-C (4.71±1.00) mmol/L,(3.16±1.00) mmol/L,TG (1.55±0.45) mmol/L,(1.49±0.44) mmol/L;intensive lipid lowering group:CIMT(0.84±0.20) mm,(0.63±0.17) mm,FMD (3.74±1.38) %,(0.25±1.58)%,TC (6.36±1.06) mmol/L,(4.10±1.00) mmol/L,LDL-C (4.73±1.01) mmol/L、(2.28±1.26) mmol/L,TG (1.56±0.53) mmol/L,(1.50±0.49) mmol/L,P＜0.05].After one year's therapy,the difference in intensive lipid lowering group was more obvious than in common group (P＜0.05).Conclusions Intensive lipid lowering therapy is more effective to decrease TC,LDL-C and CIMT and to improve the vascular endothelia function.Atorvastatin is effective to stabilize the plaque and to retard the atheroscleresis development.