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1.
Multipledatahavesuggestedthattherenin angiotensinsystem (RAS )contributestothepathogenesisofatherosclerosis Acommonfeatureinallstagesofatherogenesisistheparticipationoftheinflammationprocessinthevesselwall 1 Thetranscriptionfactor,nuclearfactor kappaB (NF …  相似文献   

2.
Focalnodularhyperplasia (FNH)andhepatocellularadenoma (HCA)aretwobenignlesionsoftheliver HCAisofclinicalconcernbecauseofitspropensitytohemorrhageandthepotentialformalignanttransformation 1 Incontrast,FNHisrarelycomplicatedbyhemorrhage ,andthepotentialofFNH…  相似文献   

3.
NO .1TheFrontierofLaboratoryAnimalSciences :MappingofGenomeforMiceFANGFude (5 )…………………InvestigationoftheNaturalCarryingRateofHepatitisBVirusofAnasPlatyrhynehosLinnaeusfromTwoFarmsofNanhaiCityinGuangdongProvinceZOUYihai,ZHANGWei,ZHANGFengxue ,etal (9)……………DNAF…  相似文献   

4.
Intracoronarystentsareusedforthebail outofacuteorthreatenedocclusionandinthereductionofrestenosisafterpercutaneoustransluminalcoronaryangioplasty (PTCA ) CommonlyusedmanualmountingofcoronarystentsontoaPTCA balloonpriortodeploymenthassomedisadvantages Fi…  相似文献   

5.
洪班信 《中国医刊》2001,36(5):57-58
I.阅读理解 :阅读下列短文 ,然后回答文章后面的问题 ,从四个供选择的答案中挑出正确的一个。FDAApprovesNewOsteoporosisDrugTheFoodandDrugAdministration (FDA)hasapprovednewdrug,raloxifene ,forthepreventionofosteoporosisinpostmenopausalwomen Osteoporosisisaconditionofprogressivedegenerationofbonemassandr…  相似文献   

6.
Inordertoevaluatethemechanismofvascularendothe lialgrowthfactor(VEGF)onthepreventionofrestenosisaf terangioplasty ,weobservedtheeffectsofVEGFonprolifer ationandNO ,ET ,PGI2 secretionandPDGF BmRNAtran scriptionofvascularendothelialcells(VEC) .Atfirst,weconstruc…  相似文献   

7.
Objective Tostudytheroleofplateletactivatingfactor (PAF)inthepathogenesisofintestinalmucosalinjuryandendotoxin/bacterialtranslocationinacuteseverepancreatitis (ASP)inpigs Methods ASPwasinducedbyintraductalinjectionofamixtureofsodiumtaurocholateandtrypsin…  相似文献   

8.
Foundedin 195 1,theCardiothoracicSurgeryDepartmentofChanghaiHospital,affiliatedtoSecondMilitaryMedicalUniversity ,hasnowbecometheCardiothoracicSurgeryInstituteofChinesePeople’sLiberationArmy(CPLA) .Ledbyformerdirectors:ProfessorCAIYong ZhiandProfessorZHANGBa…  相似文献   

9.
Intercellularadhesionmolecule 1(ICAM 1) ,asingle chain 76 - 110kDaglycoprotein ,isamemberoftheimmunoglobulinsupergenefamily ICAM 1hasbeenidentifiedasaligandforleukocyteadhesionmoleculedesignatedasalymphocytefunction associatedantigen(LFA 1) TheinteractionofICAM 1wi…  相似文献   

10.
INTRODUCTIONVascularendothelialgrowthfactor (VEGF)receptorFlt 1isakindofglucoproteinwithamolecularweightof 1 80KD .Asafamilymemberoftyrosineproteinkinasereceptorsub typeⅢ ,itconsistsofextracellular,transmembraneandintracellulardomains.TherearesevenIg likeloop…  相似文献   

11.
Objective To reconstitute an Alzheimer’s disease model by administering bradykinin (BK) or cyclosporine A (CSA) to the rat hippocampus.Methods BK or CSA was administered to the rat hippocampus using a stereotaxic apparatus.The behavior of the rats was observed with an electronic attack-jump platform.The phosphorylation of Tau protein was examined through immunohistochemical assay.Results Behavior studies showed that an obvious disturbance in learning and memory was seen in BK injected rats.No obvious dysfunction was observed in CSA injected rats.The results obtained by immunohistochemical assay indicated that the staining of M4, 12E8, paired helical filament-1 (PHF-1) and calcium/calmodulin-dependent protein kinase Ⅱ (CaMKⅡ) was stronger, and that of Tau-1 was weaker in BK injected rats compared with the control group.We also found that the binding of M4 and PHF-1 but not 12E8 to Tau was significantly increased in CSA injected rats.As for BK injection, binding of Tau-1 to Tau was decreased after CSA injection.Conclusion To our knowledge, this is the first data showing in vivo that the activation of CaMKⅡ induces both Alzheimer-like Tau phosphorylation and behavioral disturbances.  相似文献   

12.
车峰远  崔瑞耀 《齐鲁医学杂志》2007,22(2):120-121,125
目的了解蛋白激酶与蛋白磷酸酯酶活性改变对阿尔茨海默病(AD)样神经原纤维变性的影响。方法选择SD大鼠24只,随机分为实验组和对照组,各12只。实验组采用脑立体定位注射技术,向海马区注射20 mmol/L缓激肽(BK)和4.2 mmol/L环孢菌素A(CSA)各0.2 mL,对照组注射人工脑脊液0.4 mL,电跳台法测试大鼠学习与记忆状况;免疫印迹法检测Tau蛋白质磷酸化状况。结果实验组鼠出现错误次数多于对照组(t=3.362,P<0.01),受电击时间长于对照组(t=4.537,P<0.01)。实验组海马区12E8显色强于对照组,Tau-1显色弱于对照组。结论BK和CSA可诱发Tau蛋白多个位点出现AD样异常磷酸化,导致动物学习记忆障碍。  相似文献   

13.
目的探讨侧脑室单次注射Forskolin后,大鼠海马组织中tau蛋白异常磷酸化和记忆障碍持续时间及两者关系。方法向大鼠侧脑室内单次注射80μmol/L的cAMP-依赖性蛋白激酶A(PKA)激动剂-Forskolin40μl,用特定抗体通过免疫印迹和免疫组织化学方法检测大鼠海马tau蛋白磷酸化水平的改变,同时用Morris水迷宫法检测大鼠空间记忆能力。结果侧脑室注射Forskolin后,大鼠海马tau蛋白磷酸化水平在24、48和72h均有显著升高(P<0·05),在48h达到高峰(P<0·01),在72h呈恢复趋势;大鼠在注射后24、48和72h均有空间记忆障碍(P<0·05),这种记忆障碍在48h最明显(P<0·01),在72h时亦呈明显恢复趋势;大鼠空间记忆保留障碍与海马tau蛋白PHF-1位点的磷酸化程度呈正相关(r=0·97,P<0·05),与Tau-1位点的非磷酸化程度呈负相关(r=-0·963,P<0·05),与pS214位点的磷酸化程度无相关性(r=0·705,P>0·05)。结论大鼠侧脑室单次注射Forskolin只在一定时间内引起tau蛋白异常磷酸化和动物记忆障碍,且二者的改变趋势存在一定相关性。  相似文献   

14.
目的探讨低浓度铅对大鼠脑组织钙离子/钙调蛋白依赖性蛋白激酶Ⅱ(CaMKⅡ)表达的影响及中药驱铅丸的干预作用。方法 40只大鼠随机分为5组:对照组、模型组、中药高、低剂量组、依地酸钠钙(EDTA)组。除对照组外,其他4组饮水中均添加0.02%醋酸铅,中药高、低剂量组分别按每日3.5g/kg和2.0g/kg的剂量灌服驱铅丸,EDTA组以每日EDTA加普鲁卡因按50.0mg/kg肌肉注射。60d后,检测全血、脑组织铅含量,反转录-聚合酶链反应(RT-PCR)法和免疫组织化学法检测脑组织CaMKⅡ mRNA及其蛋白表达。结果与对照组比较,模型组血铅、脑铅含量显著增高(P0.01),脑组织CaMKⅡ mRNA及其蛋白表达显著降低(P0.01);与模型组比较,驱铅丸高剂量组脑铅、血铅含量显著降低(P0.05),脑组织CaMKⅡ mRNA及其蛋白表达显著增高(P0.05)。结论驱铅丸可降低铅中毒大鼠血铅、脑组织铅含量,其机制与增加脑组织CaMKⅡmRNA及其蛋白表达等有关。  相似文献   

15.
目的 研究美金刚对血管性痴呆(VD)大鼠认知功能及海马N-甲基D-天(门)冬氨酸-2B亚基受体(NMDAR-2B)水平、突触后致密物质95(PSD-95)表达和钙/钙调蛋白依赖性蛋白激酶Ⅱ(CaMKⅡ)活性的影响.方法 采用结扎双侧颈总动脉方法制备VD大鼠模型,将144只Wistar大鼠随机分为假手术组、VD模型组(VD组)和美金刚治疗组(美金刚组).于术后4、8、12、16周用Morris水迷宫检测各组大鼠的学习记忆水平,用RT-PCR法检测大鼠海马NMDAR-2B水平,用免疫组织化学法检测PSD-95的表达,用32P掺入法检测大鼠海马CaMK Ⅱ的活性.结果 与假手术组比较,VD模型组大鼠术后各时间点的学习记忆能力均显著下降(均P<0.01);海马NMDAR-2B的水平和PSD-95的表达在术后4周时明显增高(P<0.05或0.01),术后8~16周显著降低(均P<0.01);海马总CaMKⅡ活性术后4周时明显增高(P<0.01),术后8周下降(P>0.05),术后12、16周明显降低(均P<0.01).美金刚组术后4周时上述各项检测结果与假手术组差异无统计学意义,术后8、12周时学习记忆水平、NMDAR-2B水平和PSD-95的表达明显高于VD模型组(P<0.01或0.05);而总CaMKⅡ活性与VD模型组差异无统计学意义.结论 VD发生发展过程中,NMDAR-2B水平、PSD-95的表达和总CaMK Ⅱ活性先过度激活后明显降低,美金刚能拮抗或上调海马NMDAR-2B表达并改善VD大鼠的认知功能,但对CaMKⅡ活性的影响有限.  相似文献   

16.
目的 探讨慢性睡眠剥夺(CSD)对海马超微结构及海马内多巴胺D1受体下游信号通路的影响.方法 选取雄性SD大鼠35只,剔除体质量最轻、负重游泳时间最短和Morris水迷宫实验中90 s仍找不到平台的11只大鼠,其余24只随机分为大平台对照(TC)组、CSD组和CSD+多巴胺D1受体激动剂SKF38393 (SKF)组,采用改良多平台水环境法建立大鼠CSD模型,SKF组在CSD 15~21 d腹腔注射SKF38393(1 mg/kg).CSD21 d时,采用透射电镜观察各组大鼠海马的超微结构,采用蛋白质印迹法及qPCR检测大鼠CSD后海马内多巴胺D1受体相关信号通路关键因子的表达.结果 CSD导致的海马神经元线粒体肿胀变性、膜结构破坏可通过使用SKF38393得以改善.与TC组相比,CSD组大鼠海马内腺苷酸环化酶5(Adcy5)、cAMP依赖蛋白激酶α型催化亚基(Prkacα)、多巴胺和cAMP调节的磷蛋白(Darpp32)、Ras相关蛋白(Rap)1a、细胞外信号调节蛋白激酶1和2(ERK1/2)、磷脂酶C31 (PLCβ1)、钙/钙调蛋白依赖性蛋白激酶Ⅱa和Ⅳ(CaMKⅡa、CaMKⅣ)mRNA表达均降低(P<0.05),蛋白激酶A催化亚基α(PKAcα)总蛋白及其磷酸化水平、磷酸化ERK1/2、PLCp1和磷酸化-CaMKⅣ蛋白表达均降低(P<0.05).与CSD组相比,SKF组Prkacα、Darpp32、Rap1a、Rap1b、ERK1和CaMKⅣmRNA表达均增加(P<0.05);PKAcα总蛋白及其磷酸化均以及磷酸化CaMKⅣ蛋白表达均增加(P<0.05),但PLCp1和CaMKⅣ总蛋白表达水平无明显变化.结论 CSD可破坏海马神经元超微结构,使用多巴胺D1受体激动剂SKF38393可有效改善海马超微结构,其机制可能与PK和磷酸肌醇信号通路的参与有关.  相似文献   

17.
目的 探讨神经节苷脂钠(GM)侧脑室注射对脑瘫模型大鼠学习记忆能力的机制,为临床治疗脑瘫提供理论依据.方法 将36只SPF级SD大鼠随机分为对照组、模型组和GM组.模型组和GM组大鼠通过切除大脑皮质及部分脑组织建模.成模后1d、10d、20 d、30 d用大鼠脑定位仪经大鼠侧脑室注射GM给药.在成模后和未次给药后用水迷宫仪进行空间探索实验、定位航行、悬吊、斜坡等实验,比较大鼠学习记忆能力及运动能力改变,并采用ELISA测定脑海马区乙酰胆碱(Ach)及眶静脉血乙酰胆碱脂酶(AChE)活性;脑组织液钙调蛋白依赖性蛋白激酶Ⅱ(CaMKⅡ)及钙调蛋白(CaM).结果 与模型组比较,GM组大鼠治疗后找到平台时间及斜坡实验时间显著缩短;悬吊时间、第一象限和中环停留时间明显延长;定位航行中潜伏期、游泳距离缩短,脑海马区Ach含量降低、AChE活性增强;脑组织液CaMKⅡ及CaM增高(P<0.05).结论 GM可明显抑制脑瘫模型大鼠脑组织液CaMKⅡ和CaM合成,降低神经细胞钙蛋白水解和钙内流,并通过阻断CaMKⅡ这一信号传导通路,提高AChE活性,抑制Ach释放来降低大鼠因脑缺血缺氧对中枢神经造成的损伤,使受损脑神经纤维修复和再生,进而促进中枢神经纤维功能恢复来提高学习记忆能力.  相似文献   

18.
目的:观察心脑宁胶囊对血管性痴呆(VD)大鼠认知功能及海马区β淀粉样蛋白(β-amyloid peptide, Aβ)和Tau蛋白表达情况的影响,探讨心脑宁胶囊的脑保护作用。方法采用双侧颈总动脉永久结扎法制备VD动物模型,设立假手术组、模型组、心脑宁胶囊治疗组(心脑宁组)。以Morris水迷宫试验检测大鼠的逃避潜伏期以评价认知功能,采用免疫组化法测定大鼠海马区Aβ和Tau蛋白的表达。结果术后各时间点模型组与假手术组相比,大鼠的逃避潜伏期延长(P<0.01),Aβ和Tau蛋白表达明显增加(P<0.01);心脑宁组与模型组相比大鼠的逃避潜伏期明显缩短(P<0.05),Aβ和Tau蛋白表达减少(P<0.01)。结论 VD大鼠海马区Aβ和Tau蛋白表达增加,给予心脑宁胶囊治疗后,海马区Aβ和Tau蛋白的表达减少,在一定程度上改善了VD大鼠的认知功能障碍。  相似文献   

19.
目的 探讨神经肽Y基因(rAAV2/1-hNPY-EGFP)转染对大鼠癫痫发作行为、脑电图(electroencephalogram,EEG)及其海马磷酸化Tau蛋白的影响.方法 将实验组动物分为3组:对照组、KA组及NPY组,每组24只.NPY组向侧脑室注射10μl的rAAV2/1-NPY-EGFP(滴度为5×1011v.g./ml),KA组向侧脑室注射等量生理盐水.对照组在海马CA3区及侧脑室注射等量生理盐水.利用视频监视系统观察注射后2周和4周各组大鼠癫痫发作情况、发作潜伏期以及EEG,同时应用Western blotting方法检测大鼠海马中磷酸化Tau蛋白的表达.结果 (1)2周时NPY组大鼠行为学发作级别[(12.13±8.06)分]与KA组相比[(12.10±8.07)分]无明显差异(P>0.05),4周时NPY组大鼠行为学发作级别降低[(6.06±3.78)分]、发作潜伏期延长[(79.06± 8.83) min]、脑电图癫痫波放电频率减少、波幅降低(P<0.05),对照组无发作;(2)与对照组相比,KA组和NPY组大鼠在2周和4周时磷酸化Tau蛋白表达水平均明显增加(P<0.05);与KA组相比(1.87±0.23 RQ value),4周时NPY组大鼠海马组织中磷酸化Tau蛋白表达水平(1.15±0.16 RQ value)显著降低(P<0.05).结论 磷酸化Tau蛋白在癫痫大鼠海马组织中的表达变化与癫痫发作密切相关;rAAV2/1-hNPY-EGFP基因转染可以明显减轻大鼠癫痫发作级别,并可延长发作潜伏期.rAAV2/1-hNPY-EGFP基因转染可能通过抑制KA诱导的大鼠癫痫发作时磷酸化Tau蛋白的表达而发挥抗癫痫作用.  相似文献   

20.
Background Alzheimer's disease (AD) is a neurodegenerative disorder and the leading cause of dementia in the elderly. The two hallmark lesions in AD brain are deposition of amyloid plaques and neurofibrillary tangles (NFTs). Hypercholesteremia is one of the risk factors of AD. But its role in the pathogenesis of AD is largely unknown. The aim of this study was to investigate the relationship between hypercholesteremia and tau phosphorylation or β-amyloid (Aβ), and evaluate the effect of atorvastatin on the level of tau phosphorylation and Aβ in the brains of rats fed with high cholesterol diet. Methods Sprague-Dawley (SD) rats were randomly divided into normal diet control group, high cholesterol diet group, and high cholesterol diet plus atorvastatin (Lipitor, 15 mg.kg^-1 .d^-1) treated group. Blood from caudal vein was collected to measure total cholesterol (TC), triglyceride (TG), low density lipoprotein (LDL) and high-density lipoprotein (HDL) at the end of the 3th and the 6th months by an enzymatic method. The animals were sacrificed 6 months later and brains were removed. All left brain hemispheres were fixed for immunohistochemistry. Hippocampus and cerebral cortex were separated from right hemispheres and homogenized separately. Tau phosphorylation and Aβ in the brain tissue were determined by Western blotting (using antibodies PHF-1 and Tau-1) and anti-Aβ40/anti-Aβ42, respectively. Results We found that high cholesterol diet led to hypercholesteremia of rats as well as hyperphosphorylation of tau and increased Aβ level in the brains. Treatment of the high cholesterol diet fed rats with atorvastatin prevented the changes of both tau phosphorylation and Aβ level induced by high cholesterol diet. Conclusions Hypercholesteremia could induce tau hyperphosphorylation and Aβ production in rat brain. Atorvastatin could inhibit tau hyperphosphorylation and decrease Aβ generation. It may play a protective role in the patho-process of hypercholesteremia-induced neurodegeneration in the brain.  相似文献   

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