ABSTRACT
OBJECTIVE:To prepare folic acid(FA)-loaded vincristine(VCR)nano liposome(VCR-nLip-FA)and to study its effects on human liver and lung cancer cells. METHODS:VCR-nLip-FA was prepared by ammonium sulfate gradient method,and particle size,Zeta-potential,encapsulation rate and release rate were investigated. Taking human liver cancer HepG2 cells and lung cancer A549 cells as example,uptake rate and inhibitory effect in vitro (5-80 μg/ml) were compared between VCR-nLip-FA and VCR-nLip. RESULTS:The particle size distribution,average particle size,average Zeta-potential,average encapsulation rate and 24 h accumulative release rate of VCR-nLip-FA were 98.1-159.0 nm,132.2 nm,-40.1 mV,(86.6±3.5)%(n=4)and(42.2± 2.6)%. Compared with VCR-nLip,there was no statistical significance in uptake rate of A549 cells to VCR-nLip-FA and inhibitory effect of VCR-nLip-FA on A549 cell viability (P>0.05);uptake rate of HepG2 cells to VCR-nLip-FA and inhibitory effect of VCR-nLip-FA on HepG2 cell viability increased significantly (P<0.01),in dose-dependent manner. CONCLUSIONS:Prepared VCR-nLip-FA can target anti-tumor drug to HepG2 cells efficiently,and highly inhibit the growth of HepG2 cells. But it has no higher effects on A549 cells.
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Objective To explore the impacts of over-expression of microRNA-7 (miRNA-7) on the sensitivity of cis-platin in esophageal carcinoma cell line TE-1, and the possible mechanism thereof. Methods Lipofectmin 2000 method was used to transient transfect with miRNA-7 mimic into esophageal cancer cell line TE-1, which was taken as transfection group, mimic negative control was taken as transfection conrtol group. The expressions of miRNA-7 and epidermal growth factor receptor (EGFR) mRNA were detected by RT-PCR in the above two groups and normal control group. The total EGFR and EGFR in cytoplasmic and nucleus were detected with Western blot assay in transfection group and transfection control group. CCK-8 was used to detect IC50 of cisplatin in transfection group and transfection control group. The expression of EGFR was observed with immunofluorescence confocal microscope in two groups. Results The miRNA-7 expression was signifi-cantly increased in transfection group than that of transfection conrtol group and control group. The expression of EGFR mRNA was significantly reduced in transfection group (P<0.001). The total EGFR was significantly decreased in transfec-tion group than that of transfection conrtol group. The level of nuclear EGFR was significantly increased ( P<0.01),and cyto-plasm EGFR expression was significantly decreased in transfection group than that of transfection control group ( P<0.05). CCK-8 results showed that after the over expression of miRNA-7 in TE-1, the IC50 of cisplatin (48 h) increased in transfec-tion group than that of control group (P<0.01). Immunofluorescence results showed that EGFG in nuclear was higher in transfection group than that of transfection control group but its expressions reduced in cell membrane and cytoplasm. Con-clusion The over-expressed miRNA-7 in esophageal cancer cells TE-1 can reduce cisplatin sensitivity by the increased EGFR in nuclear translocation.
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BACKGROUND:Poststroke depression is one of the most common psychological behavior disorders after stroke and its mechanism remains unclear. Studies have suggested that microRNAs (miRNAs) involved in neurogenesis and synaptogenesis may play an important role in psychology diseases. OBJECTIVE:To observe the expression of miR-137 in the blood and brain of poststroke depression rats and its effect on the behaviors of rats. METHODS:Thirty-six rats were equal y divided into six groups:control, model, agomir-137, agomir-NC, agomir-137+Grin2A and agomir-137+vector groups. Control group had no treatment. Poststroke depression models were established by ligation of middle cerebral artery and chronic mild stimulation in the latter four groups fol owed by receiving an injection of nothing, agomir-137, agomir-NC, LV-CMV-Grin2A or control plasmids into the left lateral ventricle, respectively. RESULTS AND CONCLUSION:We found significantly lower miR-137 levels in the brain and peripheral blood of post-stroke depression rats compared with normal rats. Vertical scores and horizontal scores on the behavior test were significantly higher in the agomir-137 group than the agomir-NC and model groups at 3 weeks after cerebral ischemia;while, sucrose consumption percentage was also higher in the agomir-137 group at the end of 2 weeks after cerebral ischemia. Luciferase assays showed miR-137 bound to the 3’ UTR of Grin2A, regulating Grin2A expression in a neuronal cel line. Grin2A gene overexpression in the brain of post-stroke depression rats noticeably suppressed the inhibitory effect of miR-137 on post-stroke depression. Overal , these findings show that miR-137 suppresses Grin2A protein expression through binding to Grin2A mRNA, thereby exerting an inhibitory effect on post-stroke depression and offering a new therapeutic target for poststroke depression.
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ObjectiveTo evaluate the effect and safety of recombinant human erythropoietin (rhEPO) in treatment of lung cancer chemotherapy-related anemia.MethodsNinety-eight lung cancer chemotherapy-related anemia patients were divided into treatment group and control group with 49 cases each by random digits table method.The patients in treatment group were given rhEPO and chalybeate.The patients in control group were merely given chalybeate.The hemoglobin (Hb),hematocrit,allogeneic blood transfusion rate and quality of life between two groups were observed and compared.ResultsThree cases were rejected in treatment group,and 3 cases with anergy and dizzy and 2 cases with local injection site pain and sclerosis recovered spontaneously.Hb and hematocrit showed downward trend after treatment in control group,but there was no significant differences (P ＞ 0.05).Hb and hematocfit had upgrade trend after treatment in treatment group,and there were significant differences between after 4 - 8 months treatment and before treatment (P ＜ 0.05 ).The allogeneic blood transfusion rate was 24.5％ (12/49) in control group and 6.5％ (3/46) in treatment group,and there was significant difference between two groups (P ＜ 0.05 ).The quality of life in treatment group was increased compared with that in control group.There were significant differences in the effective rate after 4 or 8 weeks treatment between two groups [52.2％(24/46) vs.6.1％(3/49) and 95.7％ (44/46) vs.20.4％ ( 10/49 )].ConclusionsrhEPO is effective and safe in treatment of lung cancer chemotherapy-related anemia.rhEPO has little adverse reaction and can improve the quality of life.