异丙酚对内毒素诱导人脐静脉内皮细胞过氧亚硝基阴离子生成的影响

目的 探讨异丙酚对内毒素诱导人脐静脉内皮细胞过氧亚硝基阴离子(ONOO-)生成的影响.方法 培养至活细胞计数大于95%的人脐静脉内皮细胞,随机分为7组(n=5),对照组(C组)不给予任何处理;LOS0.1组、LPS1组和LPS10组分别加入内毒素(LPS)至终浓度为0.1、1和10 μg/ml,于37℃5%CO2培养箱中孵育6 h;P4+LPS10组和P40+LPS10组预先加入异丙酚至终浓度为4、40μg/ml,I40+LPS10组预先加入脂质溶剂Introlipid至终浓度为40 μg/ml,于37℃ 5%CO2培养箱中孵育30 min,再分别加入LPS至终浓度为10μg/ml,于培养箱中继续孵育6 h.孵育6 h时,测定细胞活力和乳酸脱氢酶(LDH)释放率;采用免疫组化法和Western blot法测定硝基酪氨酸蛋白(NT)表达.结果 与C组比较,其余各组细胞活力降低,内皮细胞NT表达上调,LPS1组、LPS10组、I40+LPS10组、P4+LPS10组和P40+LPS10组LDH释放率升高(P<0.01);与LPS0.1组比较,LPS1组细胞活力、LDH释放率和内皮细胞NT表达差异无统计学意义(P>0.05),LPS10组细胞活力降低,LDH释放率升高,内皮细胞NT表达上调(P<0.01);与LPS10组比较,I40+LPS10组细胞活力、LDH释放率和内皮细胞NT表达差异无统计学意义(P>0.05),P4+LPS10组和P40+LPS10组细胞活力升高,LDH释放率降低,内皮细胞NT表达下调(P<0.01).结论 异丙酚可通过抑制ONOO'-的生成,减轻内毒素诱导人脐静脉内皮细胞损伤.     

内毒素诱导共培养中性粒细胞——血管内皮细胞活化的体外研究

目的　建立人外周血中性粒细胞与人脐静脉血管内皮细胞系ECV 30 4体外共培养模型 ,研究内毒素对共培养中性粒细胞 血管内皮细胞活化的作用。　方法　将ECV 30 4细胞接种培养 ,待细胞接近融合 ,加入 2× 10 6/ml即时分离纯化的人外周血中性粒细胞 ,按不同的分组加入不同浓度的内毒素 (lipopolysaccharide ,LPS) ,在倒置显微镜下观察细胞形态学的改变 ,于 4、8、12、2 4h测定细胞上清中TNFα及IL 6水平的变化。　结果　不同浓度的LPS刺激内皮细胞TNFα产生没有明显的变化 ,而 1μg/mlLPS刺激共培养中性粒细胞 -ECV 30 4 ,在 4h其TNFα水平明显上升 ,10 μg/mlLPS刺激共培养中性粒细胞 -ECV 30 4 ,其TNFα水平逐渐上升 ,8h后比较明显 (P <0 .0 5 ) ,12、2 4h仍维持较高水平 ;对于单纯内毒素刺激ECV 30 4细胞 ,随着LPS浓度的增加 ,IL 6生成明显增加。 1μg/mlLPS刺激ECV 30 4IL 6自 4h后即明显上升 ,8、12h一直维持在高水平 ,直到 2 4h才明显回落。对于共培养的中性粒细胞和血管内皮细胞 ,单纯共培养中性粒细胞 -ECV 30 4IL 6无明显变化 ,而较低浓度10 0ng/mlLPS刺激共培养中性粒细胞 -ECV 30 4IL 6与 1μg/mlLPS刺激ECV 30 4相当 ,2 4h仍维持在高水平。 1μg/ml及 10 μg/ml刺激共培养中性粒细胞 -ECV 30     

高迁移率族蛋白B1对体外人肺动脉血管平滑肌细胞增殖、迁移和凋亡的影响

目的 评价高迁移率族蛋白B1(HMGB1)对体外培养人肺动脉血管平滑肌细胞(hPASMC)增殖、迁移和凋亡的影响.方法 体外培养hPASMC,调整细胞密度(2× 105个/ml)后接种到96孔板(100 μl/孔,2× 105个/ml)、6孔板(1ml/孔,2× 106个/ml)和改良24孔Boyden趋化小室(100μg/孔,5×103个/ml),采用随机数字表法,将其分为5组:对照组(C组)和不同浓度HMGB1组(H1组～H4组),分别在DMEM和含HMGB1 1、10、100、1000 ng/ml的DMEM培养液孵育.孵育24和48 h时,采用MTT法检测细胞增殖率,Boyden小室法检测透膜细胞数,TUNEL法检测hPASMC凋亡情况.结果 与C组比较,H1组～H4组细胞增殖率升高,透膜细胞数增多(P＜ 0.05);与H1组比较,H2组～H4组细胞增殖率升高,H3组和H4组透膜细胞数增多(P＜0.05);与H2组比较,H3组和H4组细胞增殖率升高,透膜细胞数增多(P＜ 0.05);H3组和H4组间各指标比较差异无统计学意义(P＞0.05);与孵育24h时比较,各组孵育48 h时细胞增殖率升高(P＜0.05).各组细胞凋亡率比较差异无统计学意义(P＞ 0.05).结论 HMGB1可促进hPASMC的增殖和透膜迁移,可能参与肺损伤肺血管重构的发生.     

异丙酚对LPS诱导BV-2小胶质细胞IL-1β和TNF-α释放的影响及TLR4在其中的作用

目的 评价异丙酚对LPS诱导BV-2小胶质细胞IL-1β和TNF-α释放的影响及Toll样受体4(TLR4)在其中的作用.方法 将体外培养的BV-2小胶质细胞接种于96孔培养板中,采用随机数字表法,将其随机分为4(n=12):对照组、LPS组、异丙酚组和LPS+异丙酚组.LPS组加入LPS1μg/ml孵育24h;异丙酚组加入异丙酚30 μmol/L孵育24 h;LPS+异丙酚组同时加入LPS 1 μg/ml和异丙酚30 μmol/L孵育24h.于孵育6h时,采用ELISA法检测细胞上清液TNF-α浓度,以此反映TNF-α的释放量,采用RT-PCR法测定TLR4 mRNA表达;于孵育24h时,采用ELISA法检测细胞上清液IL-1β浓度,以此反映IL-1β的释放量,采用Western Blot法检测TLR4蛋白表达.结果 与C组比较,LPS组和LPS+异丙酚组IL-1β和TNF-α的释放量升高,TLR4 mRNA及其蛋白表达上调(P＜0.05);与LPS组比较,LPS+异丙酚组IL-1β和TNF-α的释放量降低,TLR4 mRNA及其蛋白表达下调(P＜0.05).结论 异丙酚可抑制LPS诱导BV-2小胶质细胞IL-1β和TNF-α的释放,其机制与抑制TLR4的表达有关.     

异丙酚对布比卡因致PC12细胞毒性时细胞Ca2+浓度和一氧化氮合酶活性的影响

目的 评价异丙酚对布比卡因致PC12细胞毒性时细胞Ca2+浓度和一氧化氮合酶(NOS)活性的影响.方法 PC12细胞悬液(105/ml)随机分成4组:对照组(C组)、异丙酚组(P组)、布比卡因组(B组)和异丙酚+布比卡因组(PB组),每组PC12细胞分别接种于36孔板(每孔1 ml,每组9孔)、激光共聚焦显微镜专用培养皿(每皿1 ml,每组6皿)和24孔板(每孔 1 ml,每组6孔).C组加入D-Hank液500 μl;P组加入异丙酚至终浓度为2 mmol/L;B组加入布比卡因至终浓度为0.09 mmol/L;PB组同时加入异丙酚和布比卡因,终浓度分别为2 mmol/L和0.09 mmol/L.于36孔板中孵育24 h后测定PC12细胞凋亡率;于激光共聚焦显微镜专用培养皿中孵育6、24 h时,测定PC12细胞游离Ca2+浓度;于24孔板中孵育6、24 h时测定细胞NOS活性.结果 与C组相比,B组和PB组PC12细胞游离Ca2+浓度、NOS活性和凋亡率均升高(P<0.01),P组上述指标差异无统计学意义(P>0.05);与B组相比,PB组PC12细胞游离Ca2+浓度、NOS活性和凋亡率均降低(P<0.05).结论 在细胞水平,异祆丙酚可能通过抑制NOS活性和钙超载,减轻布比卡因诱导的神经毒性.     

脂多糖对大鼠体外培养中性粒细胞p38MAPK和MMP-8 mRNA表达的影响

目的 探讨脂多糖(LPS)对大鼠体外培养中性粒细胞p38丝裂原活化蛋白激酶(p38MAPK)和中性粒细胞胶原酶(MMP-8)mRNA表达的影响.方法 抽取SD大鼠外周静脉血,分离培养中性粒细胞,制备细胞悬液,72孔细胞培养板中每孑L加入1 ml细胞悬液,共60孔,随机分为2组:LPS组(n=48)加入LPS 1 μg/ml进行培养,对照组(C组,n=12)加入等体积PBS液(不做培养,直接检测).LPS组于培养30 min(T1)、60 min(T2)、90 min(T3)和120 min(T4)时取出培养板,吸取细胞悬液应用免疫组化法测定p38MAPK表达,RT-PCR法测定MMP-8 mRNA表达.结果 与C组比较,LPS组各时点p38MAPK与MMP-8 mRNA表达均升高(P＜0.05或0.01).p38MAPK表达水平与MMP-8 mRNA表达水平呈正相关(r=0.793 6,P＜0.05).结论 LPS可上调大鼠体外培养中性粒细胞p38MAPK和MMP-8 mRNA的表达.     

脂多糖对小鼠肺成纤维细胞活化的影响

目的 评价脂多糖(LPS)对小鼠肺成纤维细胞活化的影响.方法 原代培养的小鼠肺成纤维细胞,接种于96孔培养板,采用随机数字表法,将其随机分为2组,正常对照组(C组,外=6)不作任何处理,LPS组(n=24)加入LPS 1μg/ml,分别于LPS孵育3、6、24、72 h时取6孔(C组于培养72 h时),收集细胞,采用实时PCR法测定Ⅰ型前胶原mRNA、α-平滑肌肌动蛋白(α-SMA)mRNA、Toll样受体4(TLR4)mRNA和整合素β1 mRNA的表达水平.结果 与C组比较,LPS组LPS孵育3、6和24 h时Ⅰ型前胶原mRNA、α-SMA mRNA、TLR4 mRNA和整合素β1 mRNA的表达水平差异无统计学意义(P＞0.05),LPS孵育72 h时上述指标表达水平上调(P＜0.05).结论 在急性肺损伤的早期LPS一方面可直接活化小鼠肺成纤维细胞,导致肺纤维化;另一方面可上调TLR4和整合素β1的表达,增加细胞对LPS的反应性,从而加速小鼠肺成纤维细胞的活化,促进肺纤维化.

Abstract：

Objective To investigate the effect of lipopolysaccharide (LPS) on the activation of mouse lung fibroblasts. Methods Primary cultured mouse lung fibroblasts were incubated in 96 well plates and randomly divided into 2 groups: control group ( group C, n = 6) and LPS group ( n = 24). The fibroblasts were cultured for 72 h in group C. LPS 1 μg/ml was added and then the fibroblasts were incubated for 72 h in group LPS. The expression of type Ⅰ procollagen mRNA, α-smooth muscle actin (α-SMA) mRNA, Toll-like receptor 4 (TLR4)mRNA and integrin β1 mRNA was determined using real-time PCR at 3, 6, 24 and 72 h of incubation (6 wells at each time point). Results Compared with group C, there was no significant change in the expression of type Ⅰ procollagen mRNA, α-SMA mRNA, TLR4 mRNA and integrin β1 mRNA at 3, 6 and 24 h of incubation ( P ＞0.05), but the parameters mentioned above were significantly up-regulated at 72 h of incubation in group LPS ( P ＜ 0.05). Conclusion In the early acute lung injury, LPS leads to pulmonary fibrosis through activating lung fibroblasts directly, and also accelerates the activation of lung fibroblasts and promotes the process of pulmonary fibrosis through up-regulating the expression of TLR4 and integrin β1 in mice.     

自吞噬在脂多糖诱导HL-1心肌细胞损伤中的作用

目的 评价自吞噬在脂多糖(LPS)诱导HL-1心肌细胞损伤中的作用.方法 采用随机数字表法,将培养的HL-1细胞随机分为4组(n=15):正常对照组(C组)不予任何处理,继续培养24h;LPS组在细胞培养液中加入LPS(终浓度1 μg/ml);自吞噬诱导剂纳巴霉素组(R组)在细胞培养液中加入纳巴霉素(终浓度0.2 μg/ml),孵育48 h时加入LPS(终浓度1 μg/ml);自吞噬抑制剂三甲基嘌呤组(3-MA组)在细胞培养液中加入加入3-MA(终浓度10 mmol/L),孵育48 h时加入LPS(终浓度1μg/ml).各组孵育4h时测定自吞噬蛋白微管相关蛋白1轻链3Ⅱ(LC3Ⅱ)表达水平,并观察线粒体超微结构,计算自吞噬体数量,测定线粒体光密度值、线粒体膜电位(JC-1).于孵育24h时测定细胞凋亡率和Caspase-3活性.结果 与C组比较,LPS组LC3Ⅱ表达水平、线粒体光密度值、细胞凋亡率和Caspase-3活性升高,自吞噬体数量增加,JC-1降低(P＜0.05);与LPS组比较,R组LC3Ⅱ表达水平和JC-1升高,自吞噬体数量增加,线粒体光密度值、细胞凋亡率和Caspase-3活性降低,3-MA组LC3Ⅱ表达水平和JC-1降低,自吞噬体数量减少,线粒体光密度值、细胞凋亡率和Caspase-3活性升高(P＜0.05).R组线粒体超微结构损伤较LPS组减轻,3-MA组较LPS组加重.结论 自吞噬可减轻LPS诱导的HL-1心肌细胞损伤,机制可能与清除受损线粒体,改善线粒体功能,抑制细胞凋亡有关.     

NF-κB信号通路在异丙酚抑制脂多糖诱导RAW264.7细胞诱导型一氧化氮合酶基因表达上调中的作用

目的 探讨NF-κB信号通路在异丙酚抑制脂多糖(LPS)诱导RAW264.7细胞诱导型一氧化氮合酶( iNOS)基因表达上调中的作用.方法 体外培养RAW264.7细胞,以5×105/ml密度接种于6 cm培养皿(3 ml/皿)或6孔板(2 ml/孔),采用随机数字表法,将其随机分为3组(n=18):正常对照组(C组)、LPS组(L组)和LPS+异丙酚(LP组).C组不做任何处理;L组和LP组均加入1μg/mlLPS,LP组于加入LPS前2h加入50 μmol/L异丙酚.于LPS孵育30 min时,每组取6皿和6孔,收集细胞,分别采用免疫印迹法测定磷酸化IκB激酶(p-IKK)和NF-κB活性;于LPS孵育6h时,每组取6皿,收集细胞,测定iNOS mRNA表达.结果 与C组比较,L组p-IKK和iNOS mRNA表达上调,NF-κB活性升高(P＜0.05);与L组比较,LP组p-IKK和iNOS mRNA表达下调,NF-κB活性降低(P＜0.05).结论 NF-κB信号通路参与了异丙酚抑制脂多糖诱导的RAW264.7细胞iNOS基因表达上调.     

氟碳化合物对脂多糖诱导体外培养中性粒细胞NF-κB活化的影响

目的研究氟碳化合物(PFC)对脂多糖(LPS)诱导体外培养中性粒细胞NF-κB活化的影响。方法将36份中性粒细胞(每份均由200 ml健康成年人全血中提取而得)置于每孔预先放人1.5ml含10％胎牛血清的RPMI 1640培养液的细胞培养板内进行原代培养,调节中性粒细胞数为1×108/孔。随机分成两组,每组18个孔。LPS组(培养液中LPS的终浓度为10μg/ml)和PFC组(培养液中LPS的终浓度为10μml/37℃培养5 min后加入PFC 450μl)。以LPS刺激后第3、8、20小时为研究时点,分别测量细胞培养上清液中肿瘤坏死因子-α(TNF-α)浓度和中性粒细胞NF-κB活化灰度值。结果PFC组细胞培养上清液中TNF-α的浓度低于LPS组(P<0.01),NF-κB活化灰度值也低于LPS组(P<0.01);两组LPS刺激后第3小时的上清液中TNF-α的浓度和NF-κB活化灰度值也低于第8、20小时,而LPS刺激后第8、20小时之间差异无显著性。结论PFC可能是通过抑制中性粒细胞NF-κB的活化来减少炎性因子的释放。     

Phosphorylated ERM Mediates Lipopolysaccharide Induced Pulmonary Microvascular Endothelial Cells Permeability Through Negatively Regulating Rac1 Activity

IntroductionThe endotoxin lipopolysaccharide (LPS)-induced pulmonary endothelial barrier disruption is a key pathogenesis of acute lung injury (ALI) and acute respiratory distress syndrome (ARDS). However, the molecular mechanisms underlying LPS-impaired permeability of pulmonary microvascular endothelial cells (PMVECs) are not fully understood.MethodsRat PMVECs were isolated and monolayered cultured, then challenged with different doses of LPS (0.1 mg/L, 1 mg/L, and 10 mg/L). Trans-endothelial electrical resistance (TER) was utilized to measure the integrity of the endothelial barrier. Ras-related C3 botulinum toxin substrate 1 (Rac1) activity and the phosphorylation of Ezrin/Radixin/Moesin proteins (ERM) were assessed by pulldown assay and Western Blotting. Small interfering RNA (siRNA) inhibition of Rac1 and Moesin were applied to evaluate the effect of PMVEs permeability and related pathway.ResultsLPS induced dose and time-dependent decreases in TER and increase in ERM threonine phosphorylation, while inactivated Rac1 activity in PMVEC. siRNA study demonstrated that both Rac1 and Moesin were involved in the mediation of the LPS-induced hyperpermeability in PMVECs monolayers, and Rac1 and Moesin could regulate each other.ConclusionPhosphorylated ERM mediates LPS induced PMVECs permeability through negatively regulating Rac1 activity.     

Aspirin-independent antithrombotic effects of acutely attached cultured endothelial cells on endarterectomized arteries

We have compared the acute antithrombotic effects of aspirin-treated versus normal endothelial cell (EC) coverage of endarterectomized baboon aortic segments (EAS) incorporated into chronic exteriorized arteriovenous shunts in baboons. Human ECs grown in culture were incubated in control medium or medium containing aspirin (100 mumols/ml) and then attached at saturation density by incubating EC suspensions (6 x 10(5) cells/100 microliters) within EAS for 20 minutes. Nonendarterectomized aortic segments and untreated EAS served as negative and positive controls, respectively. The inhibitory effect of aspirin treatment on EC production of prostacyclin was confirmed by radioimmunoassay of its stable metabolic breakdown product, 6-keto-prostaglandin F1 alpha in supernatant medium. Thrombus formation in vivo was measured as the accumulation of indium 111-labeled platelets on endarterectomy sites in real time by scintillation camera imaging. 111In-labeled platelets were deposited rapidly, reaching a plateau by 60 minutes of 4.40 +/- 0.89 x 10(9) platelets/cm, compared with 111In-labled platelet deposition on nonendarterectomized segments of 0.89 +/- 0.26 x 10(9) platelets/cm (p = 0.008). Coverage of EAS with normal cultured ECs significantly reduced platelet deposition on EAS (1.05 +/- 0.45 x 10(9) platelets/cm; p = 0.009 at 1 hour compared with EAS not incubated with ECs). Aspirin-treated ECs also produced a marked reduction in platelet disposition (0.71 +/- 0.24 x 10 platelets/cm; p = 0.007 compared with EAS without ECs) that was equivalent to the effect of non-aspirin-treated ECs (p greater than 0.5). Scanning and transmission electron microscopy confirmed the antithrombotic effects of attached ECs. We conclude that endarterectomy of normal arteries produces a highly thrombogenic surface and the thrombogenicity is abolished by acutely attaching cultured human ECs.     

异丙酚对LPS诱导中性粒细胞Toll样受体2和Toll样受体4表达的影响

目的 探讨异丙酚对内毒素(LPS)诱导中性粒细胞Toll样受体2(TLR2)和TLR4表达的影响.方法 健康志愿者6名,年龄20～35岁,各采集外周静脉血样50 ml,加入20 U/ml肝素抗凝,分离提纯中性粒细胞,制备细胞悬液,然后随机分为6组,每组6皿:对照组(C组)不给予任何药物,置于37℃、5%CO_2培养箱中培养12 h;异丙酚脂质溶剂intralipid组(I组)、异丙酚组(P组)和LPS组(L组):分别加入intralipid(终浓度为5 μg/ml)、异丙酚(终浓度为5 μg/ml)或LPS(终浓度为1μg/ml),置于37℃、5%CO_2培养箱中孵育12 h;intralipid+LPS组(IL组)和异丙酚+LPS组(PL组)先分别加入intralipid(终浓度为5 μg/ml)或异丙酚(终浓度为5 μg/ml)后,置于37℃、5%CO_2培养箱中孵育20 min,然后加入LPS(终浓度为1μg/ml),置于37℃、5%CO_2培养箱孵育12 h.采用流式细胞仪测定中性粒细胞膜TLR2和TLR4的表达;采用荧光定量PGR检测中性粒细胞膜TLR2 mRNA和TLR4 mRNA的表达;采用ELISA法测定培养上清液TNF-α和IL-8的浓度.结果 与C组比较,I组和P组TLB2和TLR4的表达、1NF-α和IL-8L-8的浓度差异无统计学意义(P>0.05),L组和IL组TLR2和TLR4的表达上调,L组TNF-α和IL-8L-8的浓度升高,IL组IL-8浓度升高(P<0.05);与L组比较,IL组TLR2和TLR4的表达、TNF-α和IL-8L-8的浓度差异无统计学意义(P>0.05),PL组TLR2和TLR4的表达下调,TNF-α和IL-8L-8的浓度降低(P<0.05).各组TLR2 mRNA和TLR4 mRNA的表达差异无统计学意义(P>0.05).结论 异丙酚可下调LPS诱导的中性粒细胞TLR2和TLR4的表达,从而抑制炎性反应.     

丙戊茶碱对大鼠大脑皮层星形胶质细胞NGF和IL-1β释放的影响

目的 探讨丙戊茶碱对大鼠大脑皮层星形胶质细胞神经生长因子(NGF)和IL-1β释放的影响.方法 出生1～3 d的SD大鼠,体重6～8 g,原代培养大脑皮层星形胶质细胞,传代培养到第4代时以1×105个/ml的密度接种到24孔培养板中,随机分为8组,每组6孔:正常对照组(C组):无血清培养基继续培养;不同浓度丙戊茶碱组(p1～3组):分别加入含有丙戊茶碱10、100和1000μmol/L的培养基中;LPS组:加入含有LPS 1 μg/ml的培养基中;P1+LPS组、P2+LPS组和P3+LPS组:分别加入含有丙戊茶碱10、100和1000μmol/L和LPS 1μg/ml的培养基中.于孵育1、3 d时检测上清液IL-1β和NGF的浓度,以反映其释放量.结果 与C组比较,P1组、P2组和P3组星形胶质细胞NGF释放量升高,IL-1β释放量降低,LPS组NGF释放量降低,IL-1β释放量升高(P＜0.05),P1+LPS组、P2+LPS组和P3+LPS组NGF和IL-1β释放量差异无统计学意义(P＞0.05);P1组、P2组和P3组星形胶质细胞NGF释放量依次升高(P＜0.05),3组IL-1β释放量比较差异无统计学意义(P＞0.05);与LPS组比较,P1+LPS组、P2+LPS组和P3+LPS组星形胶质细胞NGF释放量升高,P2+LPS组和P3+LPS组IL-1β释放量降低(P＜0.05).结论 丙戊茶碱可促进大鼠大脑皮质星形胶质细胞释放NGF,抑制其释放IL-1β.     

肝肺综合征大鼠血清对肺微血管内皮细胞Akt表达的影响

目的 探讨肝肺综合征(HPS)大鼠血清对肺微血管内皮细胞(PMVECs)丝氨酸苏氨酸蛋白激酶(Akt)表达的影响.方法 健康3～4月龄SD大鼠30只,雌雄不拘,采用慢性胆管结扎法制备HPS模型.另取正常大鼠,原代培养、纯化及鉴定PMVECs.PMVECs接种于低糖DMEM培养基(10~6/,cm~2)或96孔培养板(200μl/孔),随机分为2组:对照组(C组)和HPS组,每组24皿或90孔,C组不予处理,HPS组加入HPS大鼠血清,血清终浓度为10%.于HPS大鼠血清中孵育24、48和72 h(T_(1～3))时分别采用RT-PCR法和Western blot法检测Akt_1 mRNA、Akt_2 mRNA和Akt_3 mRNA及其蛋白的表达,采用MTr法和~3H-TdR掺人法检测PMVECs增殖情况.结果 与C组比较,HPS组PMVECs增殖增强,Akt 蛋白及其mRNA表达水平上调(P<0.05);与T_1时比较,T_(2,3)时HPS组PMVECs增殖增强,Akt蛋白及其mRNA表达水平上调(P<0.05);与T_2时比较,T_3时HPS组PMVECs增殖增强,Akt蛋白及其mRNA表达水平上调(P<0.05).结论 Akt可能参与了HPS大鼠PMVECs增殖的调节.     

Activation of neutrophil granulocytes in an in vitro model of a cardiopulmonary bypass

Activated neutrophils play a central role in the pathogenesis of postoperative organ dysfunction after surgery with cardiopulmonary bypass. The researchers used an in vitro roller pump model to investigate the relative importance of the biomaterial, platelets, plasma proteins including activated complement, and flow mode on neutrophil activation as shown by the adhesion, degranulation, and increased the surface expression of CD11b. Neutrophil adhesion to the biomaterial increased with platelet addition, but not with plasma. Biomaterial contact activated neutrophils in a serum-free buffer, but was significantly increased by activated complement. Platelets increased neutrophil degranulation in a serum-free buffer but tended to reduce it in plasma. CD11b expression increased in both media. Complement activation was higher with neutrophils alone than with neutrophils and platelets combined. The roller pump reduced neutrophil adhesion and increased degranulation compared to passive rotation. Neutrophil interaction with platelets and complement were more important for activation than biomaterial contact and use of the roller pump. Improvement of biocompatibility is dependent on modifying complement activation and platelet interaction with neutrophils.     

Effects of phospholipase D on cardiopulmonary bypassinduced neutrophil priming

To investigate the relationship betweenphospholipase D (PLD) activation and neutrophil priminginduced by cardiopulmonary bypass (CPB), and try toclarify whether CPB-induced systemic inflammatoryresponse can be attenuated by inhibiting neutrophilic PLDactivation.