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Objective:To explore the intervention effect of proteasome inhibitor MG132 in rats with collagen-induced arthritis(CIA),which resembles human rheumatoid arthritis(RA).Methods:Forty-eight female SD rats were randomly divided into three groups,including blank control group,CIA model group and MG132-treated group.There were sixteen rats in each group.Rats in CIA model group and MG132-treated model group were injected with type Ⅱ collagen to established CIA rats.21 days after the initial immunization,the rats in the MG132-treated model group were injected subcutaneously with 1 mg/kg MG132 once daily for 2 weeks.42 days after the initial immunization,the change of paw-swelling and the arthritis scores were determined.The synovial pathology examination was performed with HE staining.The 20S proteasome activity in synovial tissue was measured by fluorescence substrate assay.The expression of NF-κB/p65,IκBα in synovial tissue were analyzed by Western blot.Results:Proteasome inhibitor MG132 significantly attenuated the severity of arthritis and histopathological changes in CIA rats.Compared with the blank control group,the 20S proteasome activity was increased significantly in the CIA model group(P<0.05),and decreased after injection of MG132.Compared with CIA rats,the expression of NF-κB/p65 significantly decreased in rats treated with MG132(P<0.01).Compared with the blank control group,the expression of IκBα protein decreased in CIA model group.After injected with MG132,the protein was significantly increased(P<0.01).Conclusion:The proteasome inhibitor MG132 may attenuates the severity of arthritis and histopathological changes in CIA rats.These effects may be mediated through the inhibition of NF-κB activity.
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Objective To investigate the effect of continuous venous-venous hemofiltration (CVVH) and continuous venous-venous hemodialysis (CVVHD) on patients with lactic acidosis.Methods A total of 137 cases with lactic acidosis were included in this prospective randomized control study.lhe patients were collected from the University of Hong Kong-shenzhen Hospitall and the First Affiliated Hospital of Shantou University Medical College from April 2009 to April 2013.Inclusion criteria were patients with lactic acidosis.Exclusion criteria were patients with end-stage malignancy or terminal stage of illnesses.The patients were randomly divided into two groups:CVVH group and CVVHD group,and patients of both group were intervened with conventional treatments as well.For each group,the lactic acid and blood gas analysis were tested before CRRT,and at 4 hours,8 hours,12 hours,24 hours,and 48 hours of CRRT.The patients' mortality and length of ICU stay time were analysed and recorded.Statistical analysis was performed using SPSS 15.0software.Results When the length of time for treatment was the same,the efficacy between CVVH group and CVVHD group showed no difference in blood lactic acid level [4 h:(11.65 ± 3.39) mmol/L vs.(11.12±2.65) mmol/L; 8 h:(8.78±2.35) mmol/L vs.(8.59±2.09) mmol/L; 12 h:(6.91 ±1.67)mmol/Lvs.(6.74±1.76) mmol/L;24h:(1.66±0.39) mmol/Lvs.(1.51±0.30) mmol/L; 48 h:(0.95 ±0.24) mmol/L vs.(0.66 ±0.20) mmol/L,P ＞ 0.05) and pH value [4 h:(6.93 ±0.14) vs.(7.05±0.09);8h:(7.04±0.10)vs.(7.12±0.05); 12h:(7.13±0.07)vs.(7.20±0.04);24h:(7.30±0.03) vs.(7.38±0.04); 48h:(7.41 ±0.03) vs.(7.46±0.02),P＞ 0.05].There are also no difference in the hospital mortality (11.4％ vs.10.4％,P=0.854) and length ofICU stay time [(9.5 ±2.4) d vs.(8.8 ± 2.9) d,P =0.329].Conclusions Both CVVH and CVVHD can effectively correct hyperlactemia,enhance acid-base balance,contributing no differences in length of ICU stay time and patients' hospital mortality.
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Objective To evaluate the effect of naringenin on KIM-1 expression in rats with renal interstitial fibrosis caused by unilateral ureteral obstruction(UUO).Methods 24 SD male rats were randomly divided into Sham group,UUO group and naringe-nin group(Nar group),respectively.Rats in UUO group and Nar group got UUO to establish renal interstitial fibrosis models. Rats in Sham group only free but not ligated and cut ureters.Rats were administered saline and naringenin 25 mg/(kg·d)for 14 days.Then,24 h urine samples were collected before the rats were killed,and KIM-1 in these samples were measured by ELISA. Specimens were obtained from obstructive renal,the pathological change of renal tubule and interstitial were observe by HE and Masson staining.Moreover,the tubulointerstitial damage index was scored and the expression of KIM-1 in renal tissue was examined by immunohistochemical staining.Results Compared with Sham group,the tubulointerstitial damage index of UUO group significantly increased(P <0.05),contents of KIM-1 in urine and renal tissues also significantly increased(P <0.05).Com-pared with UUO group,the tubulointerstitial damage index score of Nar group alleviated(P <0.01),contents of KIM-1 in urine and renal tissues also reduced(P <0.05 ).Correlation analysis showed that there was positive correlation between KIM-1 in urine and renal tissues and TDI(r=0.862,0.866,P <0.01).Conclusion Naringenin can relieve renal interstitial fibrosis and reduce the content of KIM-1.