赵帅;邹江;刘梅冬;陈广文;王浩;余凤秀;肖献忠;谭斯品
AIM:To analyze the proteins included in exosomes derived from blood of patients with hypertension and seek the main pathologi -cal changes in hypertension .METHODS:Forty-seven patients and healthy subjects were recruited and divided into two comparisons :healthy subjects vs atherosclerosis ( HS vs AS) , and atherosclerosis vs hypertension plus atherosclerosis ( AS vs HT+AS) .We extrac-ted exosomes from blood and utilized LC-MS/MS to identify the protein expression .We used GO analysis to established the hierarchy programs of biological process and molecular function .PPI was used to find the proteins related to the terms .RESULTS:It was found that three final child terms repeatedly shown in BP of the two categories ( HS vs AS and AS vs HT+AS):“signal transduction in re-sponse to DNA damage”,“response to zinc ion”, and“platelet aggregation”.It was found that two final child terms in MF of the two categories:“interleukin 2 receptor binding” and“ploy(A) RNA binding”.The proteins, PSMA6, PSMA7 and CA2, were related to the terms in the two categories .CONCLUSION: We discovered that the exosome proteins may indicate the pathological changes in hypertension through the biological processes related with the specific proteins .These specific proteins, such as VCL, PSMA6, DP, AKAP, ATP5B and CA2, can be the new indicators for severity of hypertension and new therapeutic targets .
作者: 刊期: 2016年第08期
目的:构建人食管鳞状细胞癌组织来源的移植瘤模型,并了解其病理学特征和增殖相关的信号通路活化情况。方法:将人食管癌组织移植于重度联合免疫缺陷( SCID)小鼠皮下,待移植瘤长成后对其进行鼠间连续传代。观察第1、第2、第3代移植瘤的生长特性。并对患者肿瘤组织、第1代和第3代移植瘤进行HE染色和CK5/6、p63、p40免疫组织化学染色分析。 Western blot实验检测4例所建立的移植瘤中mTOR、p-mTOR、p70S6K、p-p70S6K、Akt1、p-Akt ( Ser473)、Erk1/2和p-Erk1/2的表达情况。结果:成功建立移植瘤模型,移植瘤生长稳定并能连续传代。各移植瘤组织病理组织类型和CK5/6、p63、p40表达阳性与患者肿瘤组织一致。而在不同病人来源的移植瘤组织中信号转导通路蛋白的活化程度差异有统计学意义。结论:成功建立了人食管鳞状细胞癌组织来源的食管癌移植瘤模型,初步论证该模型能够反映患者的病理特征。
作者:金玉茜;李珂;尹学善;谢祎飞;王艳红;赵四敏;江亚南;赵继敏;赵松;田芳;路静;刘康栋;董子明 刊期: 2016年第08期
AIM:NLRP3 inflammasome was identified as the cellular machinery responsible for activation of inflammatory processes .The present study investigated whether the activation of NLRP 3 inflammasomes contributes to hyperhomocysteinemia ( HHcy)-induced in-flammation and atherosclerosis .METHODS:ApoE-/-mice were fed regular diet , high fat ( HF) diet or HF plus high methionine (HM) diet for 10 weeks.NLRP3 shRNA or scramble shRNA viral suspension was injected twice at the 2nd and the 6th weeks after HFHM treatment.The whole aortas and aortic root sections were stained with Oil Red O for atherosclerotic lesion .Plasma lipids, ho-mocysteine ( Hcy) , IL-1βand IL-18 levels were measured .We also examined the effect of Hcy on NLRP 3 inflammasomes activation in THP-1 differentiated macrophages in the presence or absence of NLRP 3 siRNA, caspase-1 inhibitor Z-WEHD-FMK, or antioxidant N-acetyl-L-cysteine ( NAC) .RESULTS:HFHM treatment induced HHcy in ApoE-/-mice.Increased plasma levels of IL-1βand IL-18, aggravated macrophage infiltration into atherosclerotic lesion , and accelerated development of atherosclerosis were detected in HHcy mice, which were associated with the activation of NLRP 3 inflammasomes.Silencing the NLRP3 gene significantly suppressed NLRP3 inflammasomes activation , reduced plasma levels of proinflammatory cytokines , attenuated macrophage infiltration , and improved HHcy-induced atherosclerosis .Moreover, we found that Hcy activated NLRP3 inflammasomes and promoted subsequent production of IL-1βand IL-18 in macrophages, which were blocked by NLRP3 gene silencing, Z-WEHD-FMK, or NAC.CONCLUSION:These data suggest that the activation of NLRP 3 inflammasomes contributes to HHcy-induced inflammation and atherosclerosis .Hcy activates NLRP3 inflammasomes in reactive oxygen species dependent pathway in macrophages .
作者: 刊期: 2016年第08期
目的:研究树鼩脑缺血及缺血后适应(postconditioning,PC)对酸敏感性离子通道(acid-sensing ion channel,ASIC)2a表达及海马微环境离子稳态性的影响,探讨ASIC2a在PC脑保护效应中的作用机制。方法:建立光化学诱导的树鼩血栓性脑缺血模型及PC模型,在观察脑组织病理形态学改变的基础上,利用单泵等速微灌流系统对海马离子微环境进行动态监测,并通过免疫组化、RT-PCR及Western blotting技术对树鼩海马组织内ASIC2a的表达进行定位和定量研究。结果:树鼩皮层脑血栓形成后引起了同侧海马神经元的继发性损伤及海马神经元微环境的紊乱;PC处理可减轻海马神经元缺血损伤性改变,并使海马微环境离子稳态失衡得以明显改善;脑缺血诱导树鼩海马ASIC2a蛋白及mRNA表达一过性增强,PC处理使得ASIC2a表达水平更高、持续时间延长(P<0.05)。结论:神经元微环境内离子稳态性异常是海马神经元继发性损伤的重要原因;PC可通过诱导ASIC2a表达上调,以强化机体内源性损伤防御机制,这也是其改善神经元微环境离子稳态性、提高缺血耐受性的关键所在。
作者:陈静;李树清 刊期: 2016年第08期
目的:探讨omega-3多不饱和脂肪酸( polyunsaturated fatty acid , PUFA)对动脉粥样硬化斑块稳定性的作用及可能机制。方法:采用低密度脂蛋白受体敲除(Ldlr-/-)小鼠喂养西方饮食(western diet, WD)6周诱导动脉粥样硬化,并在饮食中添加或不添加3%omega-3 PUFA进行干预。使用液相质谱联用检测血浆中PUFA及其代谢产物浓度。油红O染色分析测定动脉树斑块面积及主动脉根部斑块脂质含量,HE染色分析主动脉根部斑块大小,天狼星红染色分析胶原纤维含量,免疫荧光检测巨噬细胞和平滑肌细胞含量。结果:(1)与WD组相比,omega-3组小鼠动脉树斑块面积比例显著降低。(2) Omega-3处理组与对照组相比,主动脉根部斑块面积、脂质含量和巨噬细胞含量显著降低;同时胶原纤维和平滑肌细胞含量显著上升,斑块不稳定指数下降(P<0.05)。(3)Omega-3处理组血清中omega-3 PUFA显著增加,分析代谢产物发现EEQ和18-HEPE水平显著增加。结论:Omega-3处理减少动脉粥样硬化斑块面积、增加斑块稳定性,其机制可能与其代谢产物水平变化相关。
作者:刘亚晋;李丹;张栩;艾玎;朱毅 刊期: 2016年第08期
目的:感染负荷被认为是动脉粥样硬化( AS)新的独立危险因素。金黄色葡萄球菌( S.aureus)是临床常见的致病菌之一。本课题组前期研究发现,金黄色葡萄球菌超抗原样蛋白-5(SSL5)可以激活血小板。我们推测,SSL5可能通过激活血小板而诱发炎症反应,探讨其机制可以为阐明感染负荷在AS中的作用提供新的实验证据。方法:体外培养人外周血单核细胞及THP-1细胞,以SSL5激活血小板所产生的微粒( SSL5-PMPs)作用于上述细胞。结果:SSL5-PMPs呈时间和剂量依赖性地促进单核细胞IL-1β、TNF-α、MCP-1和MMP-9的表达;并促进MCP-1诱导的单核细胞迁移;阻断CD40L与CD40的相互作用,可以部分抑制SSL5-PMPs诱导单核细胞产生炎症介质;以siRNA下调单核细胞CD40或TRAF6基因的表达,导致SSL5-PMPs诱导单核细胞炎症介质的产生减少,并抑制NF-κB p65亚单位的磷酸化及核转位;阻断TLR4信号通路对SSL5-PMPs诱导单核细胞释放炎症介质没有影响。结论:SSL5可以激活血小板并产生PMPs;SSL5-PMPs与单核细胞结合,且主要与外周血中的具有促炎作用的单核细胞结合,促进炎性细胞因子的释放,CD40-TRAF6-NF-κB信号通路主要参与了这一过程。本研究为阐明感染负荷的致动脉粥样硬化机制提供了依据。
作者:胡厚源;贝俊杰;肇炜博 刊期: 2016年第08期
目的:探讨核仁素对心肌梗死后巨噬细胞极化的影响及其作用机制。方法:采用小鼠心肌梗死模型;采用心肌内注射核仁素RNA干扰的慢病毒载体,从整体水平观察核仁素低表达对小鼠心梗后死亡率的影响及对巨噬细胞极化的影响;采用流式细胞术检测巨噬细胞极化情况。结果:心肌梗死1 d后,核仁素表达减少,3 d后表达增加,5 d后明显升高,达(2.73±0.47)倍,7 d后有所下降。小鼠心肌梗死2 d、5 d后,心肌中巨噬细胞明显增多;心肌梗死2 d后心肌中M1型巨噬细胞占77.71%,而心肌梗死5 d后心肌中M2型巨噬细胞占82.13%。核仁素低表达可抑制心肌梗死5 d后M2型巨噬细胞的极化,但对巨噬细胞的侵润无明显影响,可明显减少心肌梗死后28 d的存活率。核仁素过表达可使巨噬细胞极化相关基因NOTCH1和STAT6的mRNA水平表达上调,而核仁素低表达可下调NOTCH1和STAT6的mRNA表达水平。结论:核仁素可调控心梗后巨噬细胞的极化,核仁素低表达可增加小鼠心梗后死亡率。
作者:蒋碧梅;吕青兰;李媛彬;刘梅冬;刘可;涂自智;肖献忠 刊期: 2016年第08期
目的:C1q/肿瘤坏死因子相关蛋白-3(CTRP3)是一种脂肪细胞因子,它与多种代谢性及心血管疾病密切相关,但CTRP3对线粒体生物生成的影响尚不清楚。本研究主要探讨CTRP3对心肌细胞线粒体生物生成的影响及相关机制。方法:原代培养乳大鼠心肌细胞并给予CTRP3处理。使用PCR、Western blot和免疫共沉淀等方法分别检测线粒体生物生成相关蛋白、线粒体DNA拷贝数、ATP含量和sirtuin 1( SIRT1)活性的变化。结果:CTRP3显著增加过氧化物酶体增殖激活受体共激活因子1α( PGC-1α)、核呼吸因子1( NRF-1)、线粒体转录因子A( TFAM)、线粒体氧化磷酸化复合物III和V的表达。 CTRP3显著升高心肌线粒体DNA拷贝数和ATP含量,而在心肌细胞中敲低PGC-1α可使上述效应减弱。预孵育腺苷酸活化蛋白激酶( AMPK)的抑制剂AraA可以逆转由CTRP3引起的NRF-1、TFAM和复合物III、V的表达升高。 CTRP3可上调SIRT1的表达和活性,SIRT1抑制剂EX-527可阻断CTRP3对PGC-1α的去乙酰化调节作用。此外,CTRP3对SIRT1表达和活性的促进作用也可被AraA所阻断。结论:CTRP3通过AMPK/PGC-1α通路促进心肌细胞线粒体生物生成。
作者:张城林;冯寒;李丽;王瑾瑜;张艳;吴立玲 刊期: 2016年第08期
目的:鸡尾酒疗法使得HIV阳性病人面对的临床挑战从免疫缺陷转移到心血管疾病等慢性疾病。然而,鸡尾酒疗法在生理性血管生长中的作用并不清楚。本文研究了鸡尾酒疗法骨干药物———核苷类逆转录酶抑制剂( NRTIs)对血管和淋巴管生成的影响。方法:利用体外细胞生长检测研究内皮细胞的凋亡、增殖和迁移,体内耳部和胶栓模型研究血管/淋巴管生成, Western blot检测信号通路,免疫荧光显微镜技术检测膜受体内吞。结果:药理浓度下,3种不同类型的NRTIs药物( TDF、AZT和3TC)在体内和体外都可以通过影响内皮细胞的增殖与迁移抑制血管和淋巴管生成。相对应的,NRTIs显著抑制了血管内皮中VEGFR2和FGFR1信号通路以及淋巴管内皮中VEGFR3信号通路,并且NRTI对受体酪氨酸激酶( RTK)信号通路的调控具有专一性。但是,3种NRTIs对RTK信号通路的负调控作用机制不同:AZT通过抑制RTK蛋白的成熟;而TDF和3TC则通过抑制RTK受体进入EEA1内吞小泡调控RTK的内吞。另一方面,我们发现NRTIs直接引起线粒体功能的紊乱,导致内皮细胞产生过量的线粒体来源ROS。线粒体ROS清除剂MnTMPyP可以有效逆转NRTIs导致的内皮细胞血管生成和淋巴管生成的功能障碍。结论:NRTIs引起细胞线粒体中产生过量的ROS,从而损伤内皮细胞的RTK信号通路,终负向调控血管生成和淋巴管生成。
作者:宋林;朱晓龙;裘聪;王月雯;赖蒽茵;孙益;Samson A.CHOW;余路阳 刊期: 2016年第08期
Exosomes secreted by mesenchymal stem cells have shown great therapeutic potential in regenerative medicine .In this study, we performed meta-analysis to assess the clinical effectiveness of using exosomes in ischemia /reperfusion injury based on the reports pub-lished between January 2000 and September 2015 and indexed in the PubMed and Web of Science databases .The effect of exosomes on heart function was evaluated according to the following parameters:the area at risk as a percentage of the left ventricle , infarct size as a percentage of the area at risk , infarct size as a percentage of the left ventricle , left ventricular ejection fraction , left ventricular frac-tion shortening , end-diastolic volume , and end-systolic volume .Our analysis indicated that the currently available evidence confirmed the therapeutic potential of mesenchymal stem cell-secreted exosomes in the improvement of heart function .However , further mechanis-tic studies, therapeutic safety and clinical trials are required for optimization and validation of this approach to cardiac regeneration after ischemia/reperfusion injury .
作者: 刊期: 2016年第08期
目的:PKG在血管硝酸甘油(nitroglycerin, NTG)耐受形成中起重要作用,PI3K/Akt信号通路与血管张力调节关系密切,本研究旨在探讨该通路在NTG耐受形成中的作用及其机制。方法:通过猪离体冠状动脉孵育NTG(10-5 mol/L,24 h)建立离体NTG耐受模型;通过皮下注射NTG(20 mg/kg体重,每天3次,连续3 d)建立小鼠在体NTG耐受模型;运用离体血管环灌流、Western blot、实时定量PCR及免疫荧光等方法进行研究。结果:离体和在体研究表明,耐受组血管对硝酸甘油的舒张反应较对照组显著减弱,并且耐受组血管的p-Akt (Ser473)蛋白水平显著增加。 PI3K的特异阻断剂LY294002与NTG共孵育冠状动脉24 h,可显著抑制耐受组引起的p-Akt (Ser473)蛋白水平升高,同时部分改善了血管对NTG的反应性。耐受组冠状动脉PKG的蛋白和mRNA水平较对照组明显降低,且均可被LY294002所反转。耐受组血管的p-FoxO1( Ser256)蛋白水平较对照组显著升高,且出现由胞核向胞浆的转位,以上现象均可被LY294002所阻断。结论:活化的PI3K/Akt通过促进FoxO1的出核,抑制了PKG的表达,从而导致NTG耐受。
作者:安苑铭;李妍静;张城林;丛馨;吴立玲;窦豆 刊期: 2016年第08期
目的:探讨梅花鹿二杠茸和三岔茸水提物对顺铂( CDDP)所致小鼠肾损伤的影响。方法:采用灌胃给药方式,用顺铂(15 mg/kg)诱导小鼠肾损伤模型,测定小鼠肾脏指数(KI)、血清肌酐(SCr)、血尿素氮(BUN)、肾脏组织中超氧化物歧化酶( SOD)和谷胱甘肽过氧化物酶( GSH-Px)活性及丙二醛( MDA)含量,并对肾脏组织进行HE染色,观察肾脏病理学变化,研究梅花鹿二杠茸和三岔茸的水提物各剂量对小鼠肾损伤的影响。结果:与顺铂组相比,各剂量鹿茸水提物可显著降低CDDP诱导肾损伤小鼠SCr、BUN水平及肾脏MDA含量,提高SOD和GSH-Px的活性( P<0.05);明显改善肾组织病理学形态,减轻CDDP对肾小管上皮细胞的损伤程度,且同等浓度下,与三岔茸相比,二杠茸水提物能更好地改善肾功能及减轻病理损伤。结论:鹿茸水提物减轻顺铂引起的小鼠肾损伤,其作用机制可能与鹿茸水提物增强小鼠肾脏组织的抗氧化能力有关。
作者:董思敏;王海璐;王全凯;张晶 刊期: 2016年第08期
目的:淋巴细胞表达胱硫醚γ裂解酶( cystathionine γ-lyase, CSE)/硫化氢( hydrogen sulfide , H2 S),但其是否参与高血压发病尚不清楚。本课题旨在探讨淋巴细胞CSE/H2 S拮抗高血压的免疫调节机制。方法:收取高血压患者及匹配的健康对照纳入研究。亚甲基蓝法检测外周淋巴细胞H2 S产率,Western blot 检测蛋白表达及磷酸化,RT-qPCR检测mRNA表达,biotin-switch法检测蛋白质硫氢化修饰。结果:高血压组外周血淋巴细胞CSE蛋白表达、H2 S产率及IL-10水平明显低于正常血压组,药物治疗血压恢复后CSE蛋白表达、H2 S产率及IL-10水平也恢复至正常水平。 SHR大鼠给予NaHS治疗4周后,动脉血压显著下调,同时Th17细胞亚群下调,而Treg亚群上调。分离小鼠脾脏CD4+T细胞,siRNA下调CSE或PAG均可抑制Treg的分化,减少IL-10的分泌。反之CSE过表达或H2 S供体可促进Treg分化和IL-10分泌。提示CD4+T细胞内源性CSE/H2 S可促进其向Treg亚群分化。 Treg细胞的分化受到能量代谢的调节。 CSE下调或PAG可抑制AMPK Thr172位点磷酸化,促进mTOR Ser2448位点磷酸化。反之CSE过表达或H2 S供体促进AMPK磷酸化,抑制mTOR磷酸化。 AMPK Thr172位点磷酸化受LKB1激酶调控,H2 S可促使LKB1 Cys430位点发生硫氢化修饰进而增加LKB1的磷酸化水平。结论:淋巴细胞内源性H2 S可使LKB1 Cys430位点硫氢化修饰并激活LKB1/AMPK通路,促使Treg细胞的分化,并使Treg募集到肾脏、血管周淋巴节,局部分泌IL-10增加,发挥其抗高血压作用。
作者:杜从阔;范静慧;徐文静;林宪娟;郑凤娇;耿彬 刊期: 2016年第08期
目的:观察辛伐他汀(Sim)及缺血后处理(IPO)对肾缺血再灌注损伤(RI/RI)的影响。方法:采用夹闭双侧肾动、静脉45 min后松夹再灌的方法制RIRI模型。成年健康雄性SD大鼠,体重180~220 g,随机分为5组:假手术( sham)组、溶剂对照( sham+V)组、缺血再灌注( I/R)组、Sim组和IPO组。 Sim组每日给予辛伐他汀20 mg/kg灌胃,持续2周。 IPO组用无创动脉夹,夹闭双侧肾动、静脉45 min去夹后,行6个循环夹闭10 s/再灌10 s后处理。再灌注24 h后取腹主动脉血,测定血肌酐(SCr)和尿素氮(BUN)。取血后迅速摘取双侧肾脏,观察肾组织损伤程度,检测丙二醛(MDA)、一氧化氮(NO)、一氧化氮合酶(eNOS)含量及超氧化物歧化酶(SOD)活性。结果:I/R组大鼠肾功能明显受损,BUN和SCr含量均明显高于sham组和sham+V组( P<0.01)。与I/R组相比,Sim和IPO组BUN和SCr含量均明显降低( P<0.01)。 RI/RI后,I/R组SOD活性较sham组和sham+V组显著降低(P<0.05),MDA含量显著升高(P<0.05);与I/R组相比,Sim和IPO组SOD活性明显增加(P<0.05),MDA含量则明显降低(P<0.05)。 RI/RI后,I/R组NO及eNOS含量均明显低于sham组和sham+V组(P<0.05);与I/R组相比,Sim和IPO组NO及eNOS含量均明显增加(P<0.05)。 Sham组和sham+V组Bcl-2与Bax蛋白无明显表达,I/R组Bax蛋白表达明显增多,而Bcl-2蛋白表达较少;与I/R组相比,Sim和IPO组Bax蛋白表达减少,而Bcl-2蛋白表达增加。结论:Sim和IPO减轻大鼠RI/RI的作用可能与清除氧自由基,抑制脂质过氧化和提高肾组织的抗氧化能力有关。
作者:谢怡华;牛丽静;王慧娟;苗智慧;夏晓红 刊期: 2016年第08期
AIM:To investigate whether KCNE 2 participates in the development of pathological hypertrophy .METHODS:Bidirectional ma-nipulations of KCNE2 expression were performed by adenoviral overexpression of KCNE 2 or knockdown of KCNE2 with RNA interfer-ence in PE-induced neonatal rat ventricular myocytes .Then overexpression of KCNE 2 in mouse model of left ventricular hypertrophy in-duced by transverse aortic constriction (TAC) by ultrasound microbubble-mediated gene transfer were used to detect the therapeutic function of KCNE2 in the development of hypertrophy .RESULTS:KCNE2 expression was significantly decreased in PE-induced hy-pertrophic cardiomyocytes and in hypertrophic hearts produced by TAC .Knockdown of KCNE2 in cardiomyocytes reproduced hypertro-phy, whereas overexpression of KCNE2 attenuated PE-induced cardiomyocyte hypertrophy .Knockdown of KCNE2 increased calcineurin activity and nuclear NFAT protein level , and pretreatment with nifedipine or FK 506 attenuated decreased KCNE 2-induced cardiomyo-cyte hypertrophy .Overexpression of KCNE 2 in heart by ultrasound microbubble-mediated gene transfer suppressed the development of hypertrophy and activation of calcineurin-NFAT and MAPK pathways in TAC mice .CONCLUSION:These findings demonstrate that cardiac KCNE2 expression is decreased and contributes to the development of hypertrophy via activation of calcineurin -NFAT andMAPK pathways .
作者: 刊期: 2016年第08期
AIM:Atherosclerosis primarily involved systemic arteries .Luminal surface , a monolayer of endothelial cells , of artery directly exposes to blood and is susceptible to active substances in the blood .Exosomes contain significantly amount of proteins and RNAs .Ex-osomes can be good and bad for cells , depending on their component .Thus, exosomes may contribute to atherosclerosis by affecting endothelial cells .This study analyzed the relationship of exosome proteins and atherosclerosis .METHODS: Fifty-six patients and healthy subjects were recruited and divided into two comparisons:healthy subjects vs atherosclerosis ( HS vs AS) , and hypertension vs hypertension plus atherosclerosis ( HT vs HT+AS) .Serum exosomes were decoded by protein mass spectrometry .The protein profile and function were analyzed by gene ontology ( GO) .RESULTS:It was found that five child terms repeatedly appeared in “response to stimulus” and “immune system process” of BP of the two categories ( HS vs AS and AS vs HT+AS):“positive regulation of innate immune response”,“immune response-activating signal transduction”,”activation of innate immune response”,“innate immune re-sponse-activating signal transduction” and “innate immune response activating cell surface receptor signaling pathway ”.Two child terms repeatedly showed in “binding” of MF of the two categories:“antigen binding” and “enzyme binding”.Two proteins, PSMA6 and PSMA7, were repeatedly shown in the two categories .CONCLUSION:GO analysis was utilized for structure hierarchy “tree” to illustrate these proteins involved in various terms in BP , CC and MF.The PPI analysis supplied proteins which may play potentially im-portant roles in AS process .Innate immune system and blood coagulation pathway contribute to AS formation .The proteins, PSMA6, PSMA7 and Annexin A2, may can be the new target proteins for prevention and treatment of AS .
作者: 刊期: 2016年第08期
目的:很多长链非编码RNA(lncRNA)在心血管系统中具有重要作用,其中某些lncRNA参与血管平滑肌细胞(VSMCs)增殖与迁移的调控。方法:通过分析多例高血压病人与健康人群血浆lncRNA表达谱,筛选出在高血压病人与正常人群中差异表达的lncRNA进行深入分析研究。结果:通过比较高血压病人与正常人群血浆中lncRNA表达的不同,发现一条新的ln-cRNA———LncVSM,其在高血压病人的 VSMCs 中高表达。用腺病毒诱导 LncVSM 过表达能够增加由血小板源生长因子(PDGF)刺激引起的人主动脉平滑肌细胞( HASMCs)的增殖,敲低LncVSM能够引起相反的效应。体外趋化实验表明过表达LncVSM后,HASMCs的迁移能力增强,若敲低LncVSM,无论PDGF或者AngII刺激,HASMCs的迁移能力均减弱。同时,研究发现过表达LncVSM后,α-SMA表达减少,OPN和collagen I表达升高;敲低LncVSM出现相反变化。 LncVSM能够直接与MYH11和FN-1结合,过表达或敲低LncVSM,其表达水平出现不同的变化。构建过表达LncVSM的转基因大鼠,与野生型大鼠比较,转基因鼠在10周龄出现自发性高血压,并且蛋白表达水平变化与细胞实验一致。结论:LncVSM是新发现的一条能够调控VSMCs表型转换并且与高血压相关的lncRNA。
作者:耿彬;林宪娟;金翎;范晓芳;王文洁;李晶;刘晓艳;鲍明慧;王怡丹;崔晓;杨磊;崔庆华;蔡军 刊期: 2016年第08期
目的:本研究旨在探讨人核心聚糖蛋白decorin是否可以缓解糖尿病心肌病并对其中机制进行探索。方法:在本研究中,采用Wistar大鼠作为研究对象,通过腹腔注射链唑霉素并采用高脂饮食喂养6个月诱导糖尿病心肌病模型。通过重组腺相关病毒介导大鼠心脏高表达decorin。在体外研究中,通过高浓度葡萄糖模拟在体高血糖刺激,并在人脐静脉内皮细胞中高表达decorin,通过研究细胞凋亡水平、成管能力、迁移能力和增殖能力,观察其对内皮细胞的保护效应。结果:结果显示,糖尿病心肌病大鼠表现为毛细血管密度减低、心肌纤维化以及心脏功能受损,而过表达decorin可以促进血管内皮生长因子( VEGF)的表达,增加血管密度,减轻心肌纤维化并缓解糖尿病心肌病大鼠的心脏功能。同时,体外研究结果也表明,高糖可以抑制IGF1R/AKT通路,抑制VEGF的表达,诱导内皮细胞的凋亡增加,抑制细胞的成管能力、迁移能力和增殖能力,而过表达deco-rin则缓解了上述效应。另外,抗IGF1R抗体预处理或者AKT抑制剂处理可以阻断decorin的保护作用。结论:Decorin可以通过激活IGF1R/AKT通路,上调VEGF的表达并促进血管生成,从而缓解糖尿病心肌病。
作者:唐家荣;赖金胜;陈复琼 刊期: 2016年第08期
目的:探究张应变条件下microRNA-33(miR-33)调控移植静脉内膜增生的机制,为缓解静脉移植内膜增生提供潜在治疗方法。方法:SD大鼠进行“套管法”自体静脉移植,Elastin-van Gesion染色观察内膜增生情况。使用FX4000细胞应力加载装置( Flexcell International )对静脉平滑肌细胞加载频率1.25 Hz、幅度10%的张应变以模拟静脉在动脉环境受到的张应变力学刺激。 qRT-PCR检测miR-33表达,Western blotting检测相关蛋白,BrdU增殖实验和CCK-8试剂盒检测细胞增殖。双萤光素酶报告基因验证miR-33与靶基因的作用关系。骨形态发生蛋白3(BMP3)特异性siRNA干扰片段、重组蛋白以及miR-33 in-hibitor和mimics用于研究细胞功能和相关信号通路。在体局部注射miR-33 agomir和antagomir来验证miR-33在静脉移植内膜增生中的作用。结果:移植静脉出现明显内膜增生,miR-33显著降低,而BMP3、p-Smad5和p-Smad2表达明显上升;牵拉条件下得到与移植静脉中相同的结果。双萤光素酶报告基因实验证明BMP3是miR-33的靶基因。 miR-33 mimics抑制BMP3及下游信号分子p-Smad2、p-Smad5表达和细胞增殖; miR-33 inhibitor 或者BMP3重组蛋白得到类似结果。在体注射miR-33 agomir降低BMP3及下游信号分子表达,亦可缓解静脉移植内膜增生。结论:miR-33-BMP3-Smad信号通路参与移植静脉平滑肌细胞增殖;miR-33可以缓解静脉移植内膜增生过程,具有潜在临床应用前景。
作者:黄凯;包晗;严志强;王璐;张萍;姚庆苹;施茜;陈小虎;王凯旋;沈宝荣;齐颖新;姜宗来 刊期: 2016年第08期
AIM:Heart failure is characterized by immune activation leading to production and release of proinflammatory cytokines .Inter-leukin 17A (IL-17A) is a proinflammatory cytokine and multiple lines of evidence from animal and human studies suggest crucial roles of IL-17A in heart failure.Therefore, we investigated whether common polymorphisms of genes IL17A and IL17RA (coding interleukin 17 receptor A) gene contribute to genetic predisposition to heart failure and adverse clinical outcomes associated with it .METHODS AND RESULTS:A total of 1713 adults patients with congestive heart failure and 1713 age-and sex-matched controls were genotyped for promoter SNPs, rs2275913 and rs8193037 in IL17A and rs4819554 in IL17RA, to assess the relationship between individual SNPs and the risk of congestive heart failure .Results showed that rs8193037 in IL17A was associated with the risk of congestive heart failure (P<0.01) after adjustment for multiple cardiovascular risk factors including age , sex, smoking status, diabetes, hypertension and dyslipidemia.This association was evident in both ischemic and non-ischemic heart failure (P<0.05).Furthermore, prospective fol-low-up of 12.7 months for the occurrence of adverse clinical outcomes showed that rs 4819554 in IL17RA was significantly associated with cardiovascular mortality (P<0.05) after adjustments for multiple cardiovascular risk factors and New York Heart Association functional class.CONCLUSION:This study demonstrated associations of rs8193037 in the promoter of IL17A with the risk of conges-tive heart failure, and of rs4819554 in the promoter of IL17RA with the risk of cardiovascular mortality in patients with congestive heart failure.These data lend further support to the notion that immune activation and genetic polymorphisms contribute to heart failure path -ogenesis and progression .
作者: 刊期: 2016年第08期