RESUMO
Objective To investigate the effects of dexmedetomidine on the activities of glycome-tabolism rate-limiting enzymes in erythrocytes and the plasma levels of glucose and malondialdehyde in pa-tients undergoing radical gastrectomy for cancer.Methods Sixty patients,38 males and 22 females,aged 60-80 years,scheduled for radical gastrectomy for cancer were randomly divided into dexmedetomidine group (group D)and control group (group C),30 cases in each group.The patients in group D were intra-venously infused 0.5 μg/kg dexmedetomidine 10 minutes before operation and perioperatively followed by an infusion at a rate of 0.3 μg·kg-1 ·h-1 until the abdomen were closed.Group C was infused the same a-mount of normal saline.Venous blood samples were collected for the measurement of phosphofructokinase (PFK),glucose-6-phasphate dehydrogenase (G-6PD)and aldose reductase (AR)activities in erythrocytes and the plasma levels of glucose and malondialdehyde (MDA)before induction (T0 ),60 min following the incision (T1 ),60 min (T2 ),day 1 (T3 )and day 2 (T4 )after operation.Results Compared with these at T0 ,the activity of PFK was decreased significantly and the activities of G-6PD and AR were increased markedly at T3 in both groups (P <0.05 or P <0.01),however the activity of the PFK was significantly higher,G-6PD and AR were significantly lower in group D than those in group C (P <0.05).The levels of plasma glucose elevated significantly at T1 (P <0.01),reached high peak values at T3 (P <0.01)and fell at T4 in both groups.The values of plasma glucose in group D were lower than those in group C at T1 ,T2 and T3 (P <0.01).The MDA concentration in both groups increased significantly at T3 (P <0.01),while that of group D was lower than group C (P < 0.05 ).Conclusion Dexmedetomidine could markedly decrease glucose level and alleviate oxidative stress and improve these erythrocyte glucose metabolism changes after radical gastrectomy for cancer in old patients.
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ObjectiveTo investigate the effect of propofol on IL-1β and TNF-α release from BV-2 microglia cells induced by lipopolysaccharide (LPS) and the role of Toll-like receptor 4 (TLR4).MethodsBV-2 microglia cells were seeded in 96-well plates and randomly divided into 4 groups ( n =12 each):control group,LPS group,propofol group (group P) and LPS + propofol group.In group LPS,the cells were incubated with LPS 1 μg/ml for 24 h.In group P,the cells were incubated with propofol 30 μmol/L for 24 h.In group LPS + propofol,the cells were incubated with LPS 1 μg/ml and propofol 30 μmol/L for 24 h.The concentrations of TNF-α ( at 6 h of incubation) and IL-1β (at 24 h of incubation) in the supernatant were detected by ELISA.TLR4 mRNA expression was detectedat at 6 h of incubation by RT-PCR.TLR4 protein expression was detected at 24 h of incubation by Western blot.ResultsCompared with control group,IL-1β and TNF-α release was significantly increased,and the expression of TLR4 mRNA and protein up-regulated in groups LPS and LPS + propofol ( P ＜ 0.05).Compared with group LPS,IL-1β and TNF-α release was significantly decreased,and the expression of TLR4 mRNA and protein down-regulated in group LPS + propofol (P ＜ 0.05 ).Conclusion Propofol can inhibit IL-1β and TNF-α release from BV-2 microglia cells induced by LPS and inhibition of TLR4 expression may be involved in the mechanism.