ObjectiveTo investigate the effect of neuregulin1β (NRG1β) on the learning memory abilities and the neuronal apoptosis and the expressions of nuclear factor kappa B (NFκB) in experimental Alzheimer's disease model in rats induced with beta-amyloid protein1-40 (Aβ1-40) injection.To explore the mechanisms of NRG in improving the capabilities of learning and memory.MethodsThirty adult healthy male wistar rats were randomly divided into control group (n =10),model group (n =10) and treated group (n =10).Alzheimer's disease models were established by stereotactically injecting Aβ1-40 into the left lateral ventricle,and treated by injecting NRG1β(0.3 μg · kg-1 ) into the right lateral ventricle.The learning and memory abilities of rats were evaluated with Y-electric maze before the experiment and 7 days after making Alzheimer's disease models and 14 days after treatment.HE staining was used to observe the structure of hippocampal neurons.The neuronal apoptosis of hippocampus was investigated by TUNEL assay.The expressions of NFκB in hippocampal neurons were determined with immunohistochemistry technique.ResultsCompared with control group (57.50 ± 1.58,7.20 ±1.03 ),the model group rats ( 59.50 ± 2.79,7.50 ± 1.08 ) showed low cognitive ability ( t =20.36,5.28,P ＜0.05 ),the hippocampal pyramidal cells of rats in the model group were sparse and disturbed pyramidal cells,noticeable neuron loss.The number of neuronal apoptosis and the expressions of NFκB increased significantly than those in control group (P＜0.05).Compared with model group (79.10 ±4.12,4.40 ±0.69),NRG1β strikingly improved cognitive ability ( 67.70 ± 4.90,5.80 ± 0.63 ) and normal cell structure ( t =5.63,4.69,P ＜ 0.05 ).The expressions of NFκB (25.90 ± 6.67 ) reduced while the number of neuronal apoptosis ( 23.50 ± 3.89 ) decreased markablely than those ( 41.10 ±7.95,29.30 ± 7.24) in model group(t =4.63,2.23,P ＜ 0.05).ConclusionNRG1β might decrease the neuronal apoptosis by inhibiting NFκB expressions,so that to improve the learning and memory abilities of experimental dementia rats.

Objective To investigate the effect of coupled plasma filtration adsorption (CPFA) on plasma cytokines:TNF-α,IL-1β,IL-6,cellular immunity,blood lactate acid concentration,heart rate,respiration rate,oxygenation index,hemodynamics,blood cells counts,and prognosis in patients with multiple organ dysfunction syndromes (MODS).Methods This was a prospective,randomized clinical trial in 45 patients diagnosed as MODS.Patients were randomly assigned to hemoperfution with resin adsorption (HP) + continuous venous-venous hemofiltration (CVVH) group,CPFA group and CVVH group.The general clinical data,APACHE Ⅱ score,number of failure organ and previous mentioned biomarkers were documented.Blood samples were collected before and after blood filtration with any one of these procedures.The plasma samples were isolated and stored with frozen at-60 ℃.Data were statistically analyzed with SPSS 13.0 version software.Results In CPFA group,plasma cytokines,TNF-α、IL-1β、IL-6,decreased markedly after plasma adsorption for two hours (P ＜ 0.01);and plasma concentrations of IL-6 were further descended after subsequent CVVH for 10 hours (P ＜ 0.05).In HP + CVVH group,plasma cytokines,TNF-α、IL-1β、IL-6,decreased markedly after HP (P ＜ 0.01),and plasma concentrations of IL-6 were further descended after subsequent CVVH for 10 hours (P ＜ 0.05).In CVVH group,plasma cytokines,TNF-α、IL-1β、IL-6,decreased after CVVH for 12 hours (P ＜ O.05).Blood lactate acid concentration,heart rate,respiration rate,oxygenation index,T-lymphocytes subgroups (CD3 +,CD4 +,CD8 +,CD4 +/CD8 + ratio),clinical symptoms were improved and dose of vasoactive agent was reduced in the patients of three groups without differences among them.The counts of red blood cells,white blood cells and platelets after CPFA and CVVH showed no significant changes.There was no significant difference in blood cell counts between CPFA and CVVH groups.After HP + CVVH,there was a trend of decrease in platelet count (P ＜ 0.05).Platelet counts were significanfly higher in patients treated with CPFA and CVVH group than those in patients treated with HP + CVVH group (P ＜ 0.05).There were 6 patients died in HP + CVVH group,6 patients died in CPFA group and 5 patients died in CVVH group within 28days.Conclusions The comparison of efficacy of blood filtration among 3 modalities of HP + CVVH,CPFA and CVVH showed CPFA had higher capacity of Inflammatory medium scavenging than CVVH,and had less damage effect on blood visible component,especially on platelet compared with HP + CVVH.CPFA was an effective and safety modality in the treatment of the patients with multiple organ dysfunction syndrome.