含饱和氢气肾保存液对大鼠肾脏冷缺血再灌注损伤的影响

目的 评价含饱和氢气肾保存液对大鼠肾脏冷缺血再灌注损伤的影响.方法 健康雄性Wistar大鼠24只,周龄8～10周,体重200～ 250 g,采用随机数字表法,将其随机分为3组(n=8):对照组(H1组)大鼠仅切除右肾;普通肾保存液组(H2组)大鼠采用冷缺血再灌注模型,用4℃普通HC-A肾保存液对左肾行冷灌注和冷保存;含饱和氢气肾保存液组(H3组)大鼠操作同H2组,灌注液及保存液换用自制的4℃含饱和氢气HC-A肾保存液.于再灌注24 h时抽取下腔静脉血样,测定血清BUN、Cr、TNF-α和IL-6浓度;切取左肾,测定肾组织MDA和8-羟基脱氧鸟苷(8-OHdG)含量,光镜下观察肾组织病理学结果.结果 与H1组相比,H2组和H3组大鼠血清BUN、Cr、TNF-α和IL-6浓度及肾组织MDA和8-OHdG含量均升高(P＜ 0.05);与H2组相比,H3组血清BUN、Cr、TNF-α和IL-6浓度及肾组织MDA和8-OHdG的含量均降低(P＜0.05).H1组肾组织形态结构未见明显异常,H2组肾小管损伤明显,H3组肾小管损伤较H2组减轻.结论 含饱和氢气肾保存液可明显减轻大鼠肾脏冷缺血再灌注损伤.     

还原型谷胱甘肽对大鼠肝脏缺血再灌注损伤后炎性细胞因子表达的影响

目的 探讨经门静脉注射还原型谷胱甘肽(GSH)对大鼠肝脏缺血再灌注损伤后TNF-α、IL-1β和巨噬细胞炎性蛋白-2(MIP-2)表达的影响及意义.方法 72只雄性SD大鼠平均分为假手术组(SO组)、生理盐水预处理组(IR组)和GSH预处理组(GPC组).建立肝脏缺血再灌注损伤模型,检测再灌注30、60和180 min血清TNF-α、IL-1β含量,以及肝组织中TNF-α mRNA、IL-1β mRNA和MIP-2mRNA表达水平.两独立样本采用t检验,多组比较采用方差分析.结果 GPC组血清TNF-α含量于缺血再灌注180 min后显著低于IR组(t=2.512,P<0.05).而肝组织TNF-αmRNA表达水平于缺血再灌注30 min后即显著低于IR组(t=2.427,P<0.05).GPC组血清中IL-1β含量和肝组织中IL-1βmRNA表达水平于缺血再灌注后各时相点均显著低于IR组(t=2.731,3.825,4.372,3.371,3.972,4.685,P<0.05).GPC组MIP-2 mRNA表达于缺血再灌注60 min和180 min显著低于IR组(t=2.593,5.429,P<0.05).结论 TNF-α、IL-1β和MIP-2等炎性因子在肝脏缺血再灌注损伤中发挥重要作用.GSH能够抑制炎性细胞因子如TNF-α、IL-1β和MIP-2的生成,并发挥抗肝脏缺血再灌注损伤的作用.     

氯胺酮对大鼠肾脏缺血再灌注损伤的影响

目的 探讨氯胺酮对大鼠肾脏缺血再灌注损伤的影响.方法 健康雄性Wistar大鼠24只,随机分为4组(n=6):假手术组(S组)、缺血再灌注组(IR组)、氯胺酮2 ms/kg组(K_1组)及氯胺酮10 mg/kg组(K_2组).采用无创动脉夹夹闭左肾动脉45 min,再灌注6 h,制备大鼠肾脏缺血再灌注模型.K_(1,2)组于再灌注前5 min分别经尾静脉注射氯胺酮2、10 mg/kg.于再灌注6 h时取右心耳血样2 ml,测定血清肌酐(Cr)及尿素氮(BUN)的浓度;光镜下观察肾组织病理学结果 ;采用免疫组织化学法测定肾组织Fas或Caspase-3表达水平;采用TUNEL法检测肾小管上皮细胞凋亡情况,并计算凋亡指数(AI).结果 与S组比较,其余3组血清Cr、BUN的浓度升高,肾组织Fas、Caspase-3的表达上调,AI升高(P<0.01);与IR组比较,K_(1,2)组血清Cr、BUN的浓度降低,肾组织Fus、Caspase-3的表达下调,AI降低(P<0.01);与K_1组比较,K_2组血清Cr、BUN浓度降低,肾组织Fas、Caspase-3的表达下调,AI降低(P<0.01).K_2组肾组织病理损伤较K_1组明显减轻.结论 氯胺酮可减轻肾脏缺血再灌注损伤,且呈剂量依赖性,可能与其抑制肾小管上皮细胞凋亡有关.     

利多卡因预先给药对肾脏缺血再灌注损伤大鼠肾组织CD44和TNF-α表达的影响

目的 评价利多卡因预先给药对肾脏缺血再灌注损伤大鼠肾组织CD44和TNF-α表达的影响.方法 健康雄性Wistar大鼠36只,体重300～350 g,随机分为3组(n=12):假手术组(S组)、肾脏缺血再灌注组(IR组)和利多卡因预先给药组(L组).采用无创动脉夹夹闭双侧肾动脉60min、恢复灌注4 h,建立大鼠肾脏缺血再灌注模型.L组于夹闭双侧肾动脉前5min时尾静脉注射利多卡因5 mg/kg;IR组于夹闭双侧肾动脉前5 min时尾静脉注射等容量生理盐水;S组不夹闭双侧肾动脉,于分离肾动脉后尾静脉注射等容量生理盐水.再灌注4 h时处死大鼠,取肾组织,光镜下观察病理学结果;采用免疫组化法测定肾组织CD44和TNF-α的表达水平.结果 与S组比较,IR组肾组织CD44和TNF-α的表达上调(P＜0.05),L组肾组织CD44和TNF-α的表达差异无统计学意义(P＞0.05);与IR组比较,L组肾组织CD44和TNF-α的表达下调(P＜0.05),肾组织损伤减轻.结论 利多卡因预先给药减轻大鼠肾脏缺血再灌注损伤与其抑制肾组织CD44和TNF-α的表达有关.     

热休克蛋白70对肾脏缺血预处理保护作用的研究

目的 :研究缺血预处理对肾脏缺血再灌注损伤的保护作用 ,观察热休克蛋白 70 (HSP70 )的表达变化并探讨其作用机制。方法 :建立大鼠肾脏缺血再灌注损伤模型并进行缺血预处理 ,实验分组 :假手术组 (S组 )、缺血再灌注组 (IR组 )和缺血预处理组 (PC组 )。各组再灌注后检测血清肌酐 (Scr)、肾组织丙二醛 (MDA)含量 ,肾组织石蜡切片苏木精伊红染色以及免疫组化染色。结果 :PC组Scr值、肾小管病理评分、肾组织中MDA含量明显低于IR组 (P <0 .0 5 ) ,PC组与S组比较差异无显著性意义 (P >0 .0 5 ) ;HSP70免疫组化染色 :S组未见明显的阳性反应产物 ,PC组和IR组肾小管上皮细胞胞质可见棕黄色阳性反应产物。计算机图像分析显示PC组灰度值显著高于IR组 (P <0 .0 1)。结论 :缺血预处理对肾脏缺血再灌注损伤有明显保护作用 ,其作用机制可能与HSP70本身的细胞保护作用及HSP70的细胞内抗氧化作用有关     

缺血再灌注损伤大鼠肾脏凝血纤溶相关蛋白的表达

目的 观察缺血再灌注(IR)大鼠肾组织凝血纤溶相关物质的蛋白表达并探讨其意义.方法 雄性Wistar大鼠48只被随机分为6组:假手术组(Sham组)、缺血再灌注0、2、6、12、24 h组(IR0h组、IR2h组、IR6h组、IR 12h组、IR 24 h组),每组8只.用无创动脉夹夹闭双肾动脉45 min建立IR模型.HE染色观察肾组织病理改变;免疫组织化学法检测肾组织内皮素(ET-1)、组织型纤溶酶原激活物(tPA)、纤维蛋白原样蛋白2(Fgl-2)凝血酶原酶蛋白的表达.结果 与Sham组相比,IR 24 h组大鼠血BUN及Scr升高,差异有统计学意义(P＜0.05).IR各组肾组织病理改变程度随再灌注时间延长而逐渐加重;与Sham组相比,IR各组肾小管损伤半定量评分明显升高,差异有统计学意义(P＜0.05).IR各组肾ET-1蛋白表达增加,6h达高峰,与Sham组相比差异有统计学意义(P＜0.05).IR各组肾Fgl-2凝血酶原酶表达增加,12h达高峰,24 h基本恢复正常,与Sham组相比,差异有统计学意义(P＜0.05).肾组织t-PA表达增加,12h达高峰,与Sham组相比,差异有统计学意义(P＜0.05).结论 肾脏IR损伤后存在肾组织凝血纤溶相关物质的异常表达,推测后者可能参与了肾脏IR损伤.     

肾缺血再灌注损伤后miR-210及其靶基因的变化

目的 观察缺血再灌注损伤(IRI)对小鼠肾脏mir-210及其靶基因Ephrin-A3表达的影响.方法 将10只成年昆明雌鼠随机分为缺血再灌注组(IR)、假手术组(Sham),每组5只.IR组完全阻断双肾蒂40 min后恢复血流,Sham组暴露左右双肾40 min后关闭腹腔.每组在手术4 h后取肾组织标本,采用实时定量聚合酶链反应(PCR)检测mir-210表达水平;RT-PCR和酶标免疫组织化学染色法检测Ephrin-A3基因和蛋白的表达情况.结果 IR组miR-210表达水平明显上升(P<0.05).因miR-210对靶基因Ephrin-A3的负向调节作用,PCR结果显示IR组Ephrin-A3基因表达水平明显高于Sham组(P<0.01).Ephrin-A3蛋白主要表达在肾小管上皮细胞胞质中,Sham组Ephrin-A3蛋白表达水平较IR组明显升高(P<0.01).结论 肾缺血再灌注损伤明显影响miR-210及其靶基因Ephrin-A3的表达,miR-210表达的变化可能与肾缺血再灌注损伤的修复有关.     

IL-17在小鼠肾脏缺血再灌注损伤表达的变化及意义

目的:观察小鼠肾脏缺血再灌注损伤(IR)后不同时间点的血清及肾组织中白细胞介素-17(IL-17)的变化情况。方法:将C57BL/6雄性小鼠随机分为两组。假手术组(n=20)小鼠仅暴露腹腔游离肾蒂,30分钟后关闭腹腔;IR组(n=20)采用100g压力无创血管夹夹闭双侧肾蒂,30分钟后去除,恢复血流。于肾脏IR手术再灌注后3、6、12、24小时收集小鼠血浆及肾脏标本,用全自动生化仪分析血清中肌酐(SCr)与尿素氮(BUN)含量;用HE染色法观察小鼠肾脏组织病理变化;应用酶联免疫吸附法(ELISA)检测不同时间点小鼠血清及肾脏组织中IL-17的含量。结果:肾脏IR诱导小鼠血清BUN、SCr水平显著增高,肾小管坏死率也显著增加,均于IR后24小时达高峰,与假手术组小鼠3、6、12及24小时同时间点相比较,差异有统计学意义(P0.01);小鼠血清及肾组织中IL-17含量也随病情进展表现出升高趋势,IR后24小时达顶峰,与假手术组同时间点相比,差异均具有统计学意义(P0.01)。结论:小鼠肾IR后血清及肾组织中IL-17表达明显增加,大量IL-17表达与肾IR后炎症反应的发生密切相关。IL-17的大量表达可能对小鼠肾脏功能损伤及病理改变有诱导或促进作用。     

AMPK attenuates inflammation to reduce fibrosis induced by acute ischemia reperfusion injury in mice

Objective To observe the effect of adenosine monophosphate activated protein kinase (AMPK) on attenuating inflammation in fibrosis induced by acute ischemia reperfusion injury (IRI) in mice. Methods Forty eight male C57BL/6 mice were randomly divided into four groups: sham operation group (sham group), IRI group, AMPK inhibitor+IRI group (AMPK/IRI group) and normal saline+IRI group (NS/IRI group), 12 mice each group. The mice with renal IRI were occluded for 30 min through clipping bilateral renal pedicle, then released renal perfusion. Mice in sham group were performed the separation of renal pedicle without clipping. Mice in AMPK/IRI group and NS/IRI group were respectively intraperitoneal injected AMPK inhibitor and normal saline before IRI. At the 2 d after operation, 6 randomly-selected mice from each group were blooded by extraction eyeball to detect BUN and Scr. The renal histopathological changes were observed through HE staining. The mRNA expression of IL-1β, IL-6 and TNF-α was detected by real time PCR, and the level of AMPK phosphorylation was detected by Western blotting. At the 14 d after operation, Collagen 1 (COL1), α-SMA and fibronectin (FN) were detected by immunofluorescence and Western blotting in 6 remained mice from each group. The degree of kidney fibrosis was observed through sirus red staining. Results Compared with those in sham group, tubular interstitial damage was aggravated (P＜0.05), BUN and Scr were increased (P＜0.05), the mRNA expression of IL-1β, IL-6 and TNF-α was increased at the 2 d after operation (all P＜0.05), and the level of AMPK phosphorylation was activated in IRI group and NS/IRI group (all P＜0.05); the degree of kidney fibrosis and the expression of COL1, α-SMA and FN were increased obviously at the 14 d (all P＜0.05). Compared with those in IRI group, in AMPK/IRI group tubular interstitial damage was aggravated (P＜0.05), BUN and Scr were increased (all P＜0.05), the mRNA expression of IL-1β, IL-6 and TNF-α was increased at the 2 d (all P＜0.05), and the level of AMPK phosphorylation was decreased (P＜0.05). Moreover, the degree of kidney fibrosis and the expression of COL1, α-SMA and FN were increased obviously at the 14 d in AMPK/IRI group (all P＜0.05). Conclusions AMPK can ameliorate the acute renal ischemia reperfusion injury induce fibrosis in mice, and the mechanism may be related to the decrease of inflammatory reaction.     

富氢液联合浅低温对大鼠脑缺血再灌注损伤的影响

目的 观察富氢液联合浅低温对大鼠脑缺血再灌注损伤的影响.方法 雄性SD大鼠50只,周龄9～10周,体重250～300 g,随机分为5组(n=10):假手术组(S组)、脑缺血再灌注组(IR组)、富氢液组(H组)、浅低温组(M组)、富氢液+浅低温组(HM组).IR组、H组、M组和HM组采用结扎双侧颈总动脉的方法制备大鼠脑缺血再灌注模型,缺血15 min,再灌注6 h.H组和HM组于再灌注即刻腹腔注射富氢液5 ml/kg,其余3组腹腔注射等容量生理盐水.同时S组、IR组和M组维持直肠温37～38 ℃;M组和HM组于15 min内将直肠温降至32～34 ℃,并维持6 h.再灌注6 h时处死大鼠,取一侧海马组织,分别行尼氏染色和HE染色,光镜下观察病理学结果;取另一侧海马组织,采用Western blot法测定CA1区HO-1表达、MDA和TNF-α的含量.结果 H组、M组和HM组病理学损伤较IR组减轻,其中HM组减轻最明显.与S组比较,IR组、H组、M组和HM组海马HO-1表达上调,MDA和TNF-α的含量增加(P＜0.05);与IR组比较,H组、M组和HM组海马HO-1表达上调,MDA和TNF-α的含量降低(P＜0.05);与H组和M组比较,HM组海马HO-1表达上调,MDA和TNF-α的含量降低(P＜0.05);H组和M组上述指标差异无统计学意义(P＞0.05).结论 富氢液联合浅低温可减轻大鼠脑缺血再灌注损伤,可能与上调海马HO-1的表达,降低MDA和TNF-α的含量有关.     

外源性硫化氢抑制TLR2和TLR4表达并减轻大鼠肾脏缺血再灌注损伤

目的观察外源性硫化氢(H₂S)供体硫氢化钠(NaHS)能否抑制Toll样受体2(TLR2)和Toll样受体4(TLR4)表达、减轻大鼠肾脏缺血再灌注损伤(IRI)。 方法24只6~8周龄雄性SD大鼠随机分为3组：假手术(Sham)组、肾脏缺血再灌注(I/R)组、NaHS+I/R组。采用右肾切除联合左肾动脉夹闭45 min后再灌注24 h的方法诱导肾IRI。夹闭左肾动脉前，NaHS+I/R组给予NaHS(300 nmol/min)连续输注10 min，Sham组和I/R组则给予等体积生理盐水。分别留取各组腹主动脉血及肾组织标本。Western印迹法检测肾组织TLR2、TLR4蛋白的表达；免疫组织化学法检测肾组织白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)的表达；比色法检测血尿素氮(BUN)、血肌酐(Scr)。HE染色观察肾脏组织学改变；TUNEL法检测肾组织细胞凋亡。 结果与Sham组比较，I/R组的TLR2、TLR4、IL-6、TNF-α表达均增加(P<0.05)，BUN、Scr亦明显升高(P<0.05)，肾小管上皮损伤评分较高(P<0.05)，肾组织凋亡细胞增加(P<0.05)。与I/R组比较，NaHS+I/R组的TLR2、TLR4、IL-6、TNF-α表达均减少(P<0.05)，BUN、Scr亦明显下降(P<0.05)，肾小管上皮损伤评分较低(P<0.05)，肾组织凋亡细胞减少(P<0.05)。 结论外源性H₂S可以抑制TLR2、TLR4途径，减少炎症因子释放及细胞凋亡，减轻大鼠肾脏IRI。     

大鼠慢性牙周炎与慢性肾衰竭模型的建立及相关性研究

目的 用SD大鼠建立慢性牙周炎（CP）和慢性肾衰竭（CRF）动物模型,探讨两种疾病是否相关。 方法 将40只健康雄性SD大鼠随机分为4组,每组10只：正常对照组、CP组、CRF组和CP＋CRF组。于8周末处死动物,检查记录牙周指标,检测血清中血肌酐（Scr）、尿素氮（BUN）、白细胞介素（IL）1β、肿瘤坏死因子（TNF）α的含量,观察牙周和肾脏组织病理学改变,进行统计学分析。 结果 成功建立了CP和CRF动物模型。CP＋CRF组Scr（120.54±21.29） μmol/L, BUN（34.20±14.44） mmol/L;CRF组Scr（93.63±18.82） μmol/L,BUN（17.77±4.15） mmol/L,两组间差异有统计学意义（P < 0.05）。肾脏病理显示,CP组肾组织出现炎性改变,CP＋CRF组肾脏炎细胞浸润,PAS、Masson染色评分与CRF组差异有统计学意义。牙周病理显示,CP组、CP＋CRF组出现明显牙周炎,CP＋CRF组附着丧失（AL）（173.60±16.75）μm,CP组AL（124.00±23.87） μm,两组差异有统计学意义（P < 0.05）。CP组、CRF组、CP＋CRF组血清IL-1β、TNF-α水平显著高于正常对照组 （P < 0.05）,CP＋CRF组IL-1β显著高于CP组、CRF组（P < 0.05）,CP＋CRF组TNF-α水平高于CP组、CRF组,且与CP组差异有统计学意义（P < 0.05）。2×2析因设计方差分析结果显示,CP与CRF对Scr、BUN、AL的数值具有交互作用（P < 0.05）,且两因素各自对上述指标的主效应显著（P < 0.05）;CP与CRF对IL-1β、TNF-α的数值不具有交互作用（P > 0.05）,但两因素各自对IL-1β、TNF-α的主效应显著（P < 0.05）。 结论 本模型可在SD大鼠同时显现牙周炎和慢性肾衰竭,CP可加重肾衰竭,两者间有相关性,CP可能通过炎性机制加重肾脏的损害。     

Evaluation of Gadolinium Pre-Treatment with or without Splenectomy in the Setting of Renal Ischemia Reperfusion Injury in Rats

Introduction.?This study aims to investigate gadolinium chloride (Gd) pre-treatment with/without splenectomy (Splx) in the setting of renal ischemia/reperfusion (IR) injury in rats. Materials and Methods.?Under anesthesia, male Wistar albino rats with or without splenectomized (Splx) were right nephrectomized and subjected to 45 min of renal pedicle occlusion followed by 3 h of reperfusion. Gadolinium chloride (10 mg kg^?1) or saline was administered 24 hours prior to ischemia via penile vein. Right nephrectomy and intravenous saline administration was performed in the control group. At the end of the reperfusion period, following decapitation, kidney samples were taken for histological examination or determination of renal malondialdehyde (MDA) and glutathione (GSH) levels and myeloperoxidase (MPO) and Na⁺-K⁺ ATPase activities. Creatinine, blood urea nitrogen (BUN), lactate dehydrogenase (LDH), TNF-α, and IL-1β were assayed in the serum samples. Results.?Ischemia/reperfusion caused significant increases in the serum TNF-α, IL-1β, BUN, creatinine, AST, ALT, LDH, and tissue MDA levels and MPO activity, while either Gd pre-treatment or Splx decreased these parameters significantly. On the other hand, IR induced a decrease in the tissue GSH, and Na⁺-K⁺ ATPase activity was restored by both gadolinium and Splx. Furthermore, histopathological alterations induced by IR were also reversed.?Conclusion.?The extent of renal IR injury depends on the pro-inflammatory cytokine response. Gd pre-treatment decreases macrophage-derived cytokine secretion and thereby effectively limits the extent of renal IR injury in rats similar to Splx. Further studies needed to define an optimal way of decreasing macrophage-derived cytokine release due to the clinical limitations of Gd.     

Notch2/Hes-1 pathway plays an important role in renal ischemia and reperfusion injury-associated inflammation and apoptosis and the γ-secretase inhibitor DAPT has a nephroprotective effect

This study aims to investigate the role of Notch pathway in the renal ischemia/reperfusion injury (IRI)-associated inflammation and apoptosis. Materials and methods: Male Sprague-Dawley rats were divided into three groups: normal saline (NS)-treated sham rats, NS-treated ischemia/reperfusion (I/R) rats, and N-[N-(3,5-difluorophenacetyl-l-alanyl)]-S-phenylglycine t-butyl ester (DAPT) (a γ-secretase inhibitor) treated I/R rats. I/R rat model underwent nephrectomy of the right kidney and was subjected to 60 min of left renal pedicle occlusion followed by 24 h, 48 h, and 72 h of reperfusion, respectively. The levels of creatinine, urea nitrogen (BUN), interleukin (IL)-6, tumor necrosis factor (TNF)-α in serum samples and urinary N-acety-β-d-glucosaminidase (NAG) were assayed. Histological examinations were performed. The protein expression of Notch2, hairy/enhancer of split 1 (hes-1), NF-κB2, monocyte chemoattractant protein (MCP)-1, B-cell lymphoma 2 (bcl-2), and bcl-2-associated X (bax) were detected and the degree of apoptosis of tubular cells was evaluated. Results: Renal IR induced severe tubular damage, caused significant increases in the Scr, BUN, IL-6, TNF-α, urinary NAG, Notch2, hes-1, NF-κB2, MCP-1, ratio of tubule cells apoptosis, and reduction in the ratio of bcl-2 to bax. However, DAPT treatment significantly reduced the level of Scr, BUN, IL-6, TNF-α, and NAG. Thus, I/R activates Notch2/hes-1 signaling and DAPT treatment can ameliorate the severity of tubular damage after renal IRI, lower the expression of NF-κB2, MCP-1, and bax protein, increase the expression of bcl-2 protein, and reduce the ratio of terminal 2-deoxyuridine 5-triphosphate nick end-labeling-positive cells. Conclusion: Notch signaling plays an important role in the renal IRI-associated inflammation and apoptosis. DAPT can protect against IRI through partly suppressing inflammation and apoptosis, which could constitute a new target for AKI.     

再灌注期间给予富氢液对大鼠全脑缺血再灌注损伤的影响

目的 评价再灌注期间给予富氢液对大鼠全脑缺血再灌注损伤的影响.方法 成年雄性SD大鼠72只,月龄2.0～2.5个月,体重260～300 g,采用随机数字表法,将其随机分为3组(n＝24):假手术组(S组)、脑缺血再灌注组(I/R组)和富氢液组(H组).I/R组和H组采用四血管阻塞法(缺血15 min)制备全脑缺血再灌注损伤模型.H组于再灌注6h时腹腔注射0.6 mmol/L富氢液5ml/kg,I/R组给予等容量生理盐水.再灌注24h时,每组处死18只大鼠,取海马组织,测定丙二醛(MDA)、肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)含量、NF-κB活性、活化的caspase-3表达;再灌注72 h时,处死6只大鼠,取脑组织,HE染色,光镜下观察海马CA1区病理学结果,进行海马CA1区正常锥体细胞计数.结果 与S组比较,I/R组海马组织MDA、TNF-α、IL-6含量和NF-κB活性升高,活化caspase-3表达上调,正常锥体细胞计数减少(P<0.05);与I/R组比较,H组海马组织MDA、TNF-α、IL-6含量和NF-κB活性降低,活化caspase-3表达下调,正常锥体细胞计数增多(P<0.05).H组脑组织海马CA1区病理学损伤程度轻于I/R组.结论 再灌注期间给予富氢液可减轻大鼠全脑缺血再灌注损伤,其机制与抑制脂质过氧化反应、炎性反应和细胞凋亡有关.     

外源性硫化氢在大鼠肾脏缺血再灌注损伤中的保护作用

目的 观察不同剂量外源性硫化氢(H2S)供体硫氢化钠对大鼠肾脏缺血再灌注损伤( IRI)的保护作用.方法 健康雄性Wistar大鼠28只随机分为4组,即假手术组( Sham)、肾缺血再灌注(IR)组、硫氢化钠(NaHS)高剂量组、硫氢化钠低剂量组.大鼠右肾切除后,以NaHS作为硫化氢的供体,NaHS高、低剂量组分别经左肾动脉插管,按照1.5 μmol/min、300 nmol/min的剂量连续15 min给药,假手术组及IR组给予同体积生理盐水.停药5 min 后,NaHS组和IR组用无损伤微动脉夹夹闭左侧肾蒂45 min后解除阻断,建立大鼠急性IRI模型,假手术组不夹闭左肾动脉,其他操作同模型组.于肾脏恢复血流24h时留取血和肾组织标本,检测血清尿素氮(BUN)、血肌酐(Scr);半定量分析肾脏病理损伤;检测肾组织H2S生成率;采用实时定量PCR法检测胱硫醚-β-合成酶(CBS)、胱硫醚-γ-裂解酶(CSE )mRNA表达.结果 与假手术组相比,IR组H2S生成率显著降低(P＜0.01);CBS、CSE mRNA表达显著下降(P＜0.01 );Scr、BUN显著升高(P＜0.01);肾脏病理表现为急性肾小管坏死,且最严重.与IR组相比,NaHS预处理组H2S生成率升高(P＜0.05);CBS、CSE mRNA表达升高(P＜0.01 );Scr、BUN降低(P＜0.01);病理损伤明显减轻.NaHS两个剂量组之间差异无统计学意义.结论 外源性H2S对大鼠IRI具有保护作用.