肌球蛋白轻链去磷酸化调节的钙依赖及非依赖途径对高肺血流性肺动脉高压大鼠肺动脉压及右心室重构的影响  

The comparative study of calcium - dependenand calcium - independenof dephosphorylation of myosin lighchain and iteffecon pulmonary artery pressure and righventricularemodeling in rats

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作  者:杨永曜[1] 杨天和[1] 蒋清安[1] 

机构地区:[1]贵州省人民医院心内科,贵阳550002

出  处:《中华实用儿科临床杂志》2015年第13期1016-1018,共3页Chinese Journal of Applied Clinical Pediatrics

基  金:贵州省科技攻关项目[黔科合SY(2008)3065号];贵州省优秀科技教育人才省长资金[黔省专合字(2009)33号]

摘  要:目的观察抑制肌球蛋白轻链(MLC)去磷酸化的钙依赖及非依赖2条途径对大鼠高肺血流性肺动脉高压及右心室重构的影响,了解同时干预2条途径是否有叠加效应。方法经腹主动脉.下腔静脉穿刺建立高肺血流动物模型,将雄性sD大鼠50只按数字表法随机分为5组:假手术组、模型组、肌球蛋白轻链激酶(MLCK)抑制剂干预组[M组,ML-73mg/(kg·d)]、Rho/Rho激酶抑制组[F组,法舒地尔(Fasudil)20mg/(kg·d)]、双重抑制组[M+F组,ML-73mg/(kg·d)+Fasudil20mg/(kg·d)],给药8周;8周后测定大鼠平均右心室压(MRVP)、平均肺动脉压(MPAP)及右心室肥大指数和下腔静脉宽度的改变。结果与假手术组比较,模型组大鼠术后8周MRVP、MPAP明显增加[(4.19±0.67)kPa比(2.65±0.57)kPa;(4.04±0.61)kPa比(2.42±0.48)kPa;F=295.368、263.912,P均〈0.01],右心室肥大指数,即右心室(RV)与左心室加室间隔(LV+s)的比值增加[(O.41±0.03)g/g比(0.21±0.01)g/g;F=247.024,P〈0.05];予MLCK及Rho激酶抑制剂干预后,MRVP及MPAP明显降低[MRVP:M组(3.51±0.47)kPa比模型组(4.19±0.67)kPa;MPAP:F组(3.68±0.55)kPa比模型组(4.19±0.67)kPa;P均〈0.01],RV/(LV+s)降低[M组:(0.29±0.02)g/g,模型组:(0.41±0.03)gCg,F组:(0.30±0.03)g/g;F=247.024,P均〈0.05];两药合用后,逆转肺动脉压力及右心室肥大的作用更强(P〈0.05)。结论MLC去磷酸化的钙依赖及非依赖2条途径都能在一定程度上减轻高肺血流型大鼠肺动脉高压及右心室肥大的发展,同时干预2条途径能产生叠加效应。Objective To investigate the effectof calcium - dependenand calcium - independenin myosin lighchain ( ML) dephosphorylation on pulmonary hemodynamicand righventricularemodeling, and to observe whethethere isuperimposition effecwhile intervention iconducted in two wayathe same time. MethodAc- cording to random numbetable,50 ratwere divided into 5 groups:sham operation group, model group,3 mg/( kg ·d) ML -7 [ MLkinase(MLCK) inhibitor] treating group( M group) ,20 mg/( kg · d) Fasudil ( Rho kinase inhibitor) treating group(F group) and 3 mg/(kg · d)ML -7 plu20 mg/(kg · d) Fasudil treating group(M + F group). The shunbetween the abdominal aortand inferiovencavwaused to establish ramodelof pulmonary hypertension in- duced by high pulmonary flow in group of and the experimental groups. The sham operation group wagiven sham operation. MLCK and Rho kinase inhibitowere administrated intraperitoneally to ratwith the shunt. Afte8 weekof shunting, mean righventriculapressure (MRVP), mean pulmonary arterial pressure (MPAP), righventriculahyper- trophy index (RVHI) and width of inferiovenacavwere evaluated by the righcardiacatheterization procedure. ResultCompared with the sham operation group,MRVP,MPAP,and RVHI were obviously elevated in the model group [ (2.65 ±0.57) kPv(4. 19 ±0.67) kPa;(2.42 ±0.48) kPv(4.04 ±0.61) kPa,F =295. 368,263. 912,all P〈 0. 01 ; (0.21 ±0.01 ) g/g v(0. 41 ±0.03) g/g,F =247.024 ,P 〈0.01 ]. Compared with model group,the MRVP,MPAP and RVHI in M group and F group were decreased significantly [ ( 3.51 ± 0.47 ) kPv(4. 19 ± 0.67 ) kPa; ( 3.68 ± 0.55) kPav(4.19±0.67) kPa,all P〈0.01;M group:(0.29 ±0.02) g/g,model group:(0.41 ±0.03) g/g,F group (0.30 ± 0.03 ) g/g,F = 247. 024,P 〈 0. 05 ]. Buthe MRVP, MPAP and RVHI in M group and F group were highethan those of ratin the sham operation group. The MRVP, MPAP and RVHI of M + F group were elevated much obviously compared with

关 键 词:肌球蛋白轻链 去磷酸化 大鼠 高肺血流 肺动脉高压 

分 类 号:R543.2[医药卫生—心血管疾病]

 

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