G蛋白抑制肽抑制野百合碱所诱导的右室重构

目的探讨G蛋白抑制肽(GCIP-27)对野百合碱(monocrotaline,MCT)所诱导右室重构的作用及相关机制。方法SD大鼠随机分为正常组、MCT模型组、GCIP-27低剂量组(30μg·kg-1)和GCIP-27高剂量组(90μg·kg-1)。MCT造模后1d～21d给GCIP-27(ip,bid)。造模d22右心导管术测肺动脉压;称右心室自由壁重(RV)及左心室加室间隔重(LV+S),计算右心肥大指数[RVHI=RV/(LV+S)];HE染色光镜观察右室形态学改变;电镜观察右室超微结构变化;免疫组化观察右室心肌细胞核增殖抗原(PCNA)的表达。结果GCIP-27能明显抑制MCT所引起RVHI的升高、右室心肌细胞肥大及线粒体肿胀、变性和右室心肌细胞PCNA的过表达。高剂量GCIP-27降低MCT所诱导的肺动脉收缩压,平均肺动脉压的升高(P<0.05或P<0.01),但低剂量GCIP-27(30μg·kg-1)仅降低肺动脉收缩压的升高(P<0.05)。结论GCIP-27能明显抑制MCT诱导的右室重构。     

G蛋白抑制肽GCIP-27对大鼠慢性心力衰竭的影响

目的探讨G蛋白抑制肽GCIP-27对多柔比星(Dox)诱导的大鼠慢性心力衰竭的作用。方法 48只SD大鼠随机分为对照组、模型组、氯沙坦组、GCIP-27组,分别给予生理盐水、Dox、Dox+氯沙坦、Dox+GCIP-27(10、30、90μg·kg~(-1),ip,bid)。给予Dox复制模型后,再继续喂养大鼠,于d71,经胸高频彩超诊断仪测定大鼠心功能;称量大鼠体重、心脏质量、左心室质量,计算心脏质量指数和左心室质量指数;HE染色后观察大鼠心肌组织病理形态学改变。结果 Dox可明显诱导大鼠发生慢性心力衰竭;氯沙坦6mg·kg~(-1)、GCIP-27(30、90μg·kg~(-1),bid)能明显抑制大鼠左心室重构,提高心脏的射血分数和短轴缩短率,降低心脏质量指数和左心室质量指数,减少心肌组织的损伤。结论 GCIP-27能抑制慢性心力衰竭大鼠的左心室重构,改善心脏功能。     

G蛋白抑制肽GCIP-27对小鼠心肌肥大的影响

目的:探讨G蛋白抑制肽GCIP-27对去甲肾上腺素诱导的小鼠心肌肥大的作用。方法:50只小鼠随机分为对照组、模型组和GCIP-27组,分别给予生理盐水、去甲肾上腺素和GCIP-27低、中、高剂量(10、30、100μg·kg-1)连续15d。之后称量小鼠体质量、心脏重、左心室重,计算心脏指数和左心室指数。采用免疫组化法测定心肌组织的原癌基因c-Fos和细胞外信号调节激酶p-ERK1/2表达。结果:与对照组比较,模型组可明显诱导小鼠产生心肌肥大。与模型组比较,GCIP-27各剂量组能明显降低心脏指数和左心室指数,减少心肌组织中c-Fos和p-ERK1/2的表达量(P<0.05或P<0.01)。结论:GCIP-27可抑制小鼠发生心肌肥大,其机制可能与抑制c-Fos和p-ERK1/2表达有关。     

自发性高血压大鼠(SHR)心肌纤维化和巨噬细胞关系的研究——苯那普利干预试验

目的探讨巨噬细胞在自发性高血压大鼠(SHR)心肌纤维化中的作用以及苯那普利对其影响及其机制。方法12wk♂SHR分为高血压组(SHR,n=10)、苯那普利治疗组(BenL、BenH亚组,分别予苯那普利1.7、17mg.kg-1.d-1灌胃;n=10),另设年龄、性别配对的WKY大鼠为对照(WKY,n=10)。干预18wk后,测量和计算各组大鼠收缩压(SBP)、左室重量(LVM)、左室重量指数(LVMI)、左室心肌胶原含量和巨噬细胞数目;逆转录-聚合酶链反应(RT-PCR)测定各组大鼠心肌转化生长因子-β1(1(TGF-β1)和白介素-6(IL-6)的转录水平。结果SHR组SBP较WKY大鼠升高(P<0.01),BenH组的SBP明显低于SHR组(P<0.01),BenL组SBP无明显变化;SHR组较WKY心肌中巨噬细胞数目明显增多,TGF-β1和IL-6的信使核糖核酸(mR-NA)水平也明显升高(P<0.01);而BenL和BenH组SHR心肌中巨噬细胞数目和TGF-β1及IL-6的mRNA水平均较SHR组降低(P<0.05);大鼠心肌中巨噬细胞数目分别与心肌胶原容积分数(CVF)、心肌内血管周围胶原面积(PVCA)含量呈正相关(P<0.01)。结论巨噬细胞在SHR大鼠心肌纤维化中具有重要作用,苯那普利可减轻SHR心肌纤维化和巨噬细胞浸润,且可下调TGF-β1和IL-6的mRNA表达。     

阿托伐他汀对自发性高血压大鼠心室重构的影响

目的 :观察阿托伐他汀对自发性高血压大鼠(SHR)心室重构的影响。方法 :2 4只SHR随机分为4组 ,每组 6只。SHR对照组、阿托伐他汀 5 0mg组(5 0mg·kg-1·d-1)、阿托伐他汀 10mg组(10mg·kg-1·d-1)和缬沙坦组 (2 0mg·kg-1·d-1) ;6只Wistar Kyoto大鼠 (WKY)作为正常对照组。灌胃给药共 6周 ,分别于给药前和给药后每 2周测量大鼠尾动脉收缩压 (SBP)。酶法测定血清总胆固醇(TC)、甘油三酯 (TG)、高密度脂蛋白胆固醇 (HDL C)及低密度脂蛋白胆固醇 (LDL C)含量 ,放免法测定血浆和心肌血管紧张素Ⅱ (AngⅡ )水平 ,并检测心肌羟脯氨酸、胶原蛋白含量和全心重量 (HW )、左室重量 (LVM )及左室重量指数 (LVMI)。透射电镜观察心肌超微结构改变。结果 :用药前SHR各组SBP均显著高于WKY正常对照组 (P <0 .0 1) ,给药后第 4、6周 ,阿托伐他汀 5 0mg组SBP明显下降 (P <0 .0 1) ,阿托伐他汀 10mg组不明显 ;缬沙坦组自给药后第 2周 ,SBP明显下降 (P <0 .0 1)。阿托伐他汀5 0mg组TC、TG及LDL C水平较SHR对照组明显降低 (P <0 .0 5或P <0 .0 1) ,阿托伐他汀 10mg组仅LDL C水平明显下降 (P <0 .0 5 )。SHR对照组血浆AngⅡ浓度与WKY正常对照组比较无显著性差异 ,但心肌AngⅡ浓度明显增高 (P <0 .0 5 ) ;给药 6周后 ,阿托伐他     

缬沙坦、依那普利、普萘洛尔对未成年自发性高血压大鼠心脏重塑与心肌细胞凋亡的影响

目的 观察缬沙坦、依那普利、普萘洛尔对未成年自发性高血压大鼠心脏重塑与心肌细胞凋亡的影响及二者的关系,探讨预防性药物干预改善高血压心脏重塑的机制以及心肌细胞凋亡的变化在高血压病早期心脏重塑中的作用和意义。方法 24只4周龄自发性高血压大鼠(SHR),按随机区组设计分为4组,分别应用缬沙坦(30mg·kg-1·d-1)、依那普利(30mg·kg-1·d-1)和普萘洛尔(50mg·kg-1·d-1)干预4周,另设一组为对照组。计算心肌重量指数(CPI)、左心室肥厚指数(LVHI)和右心室肥厚指数(RVHI)。采用末端脱氧核糖核苷酸转移酶介导的带荧光的dUTP缺口末端标记法(TUNEL)对左心室游离壁心肌的凋亡细胞进行检测并进行半定量分析,计算心肌细胞凋亡指数(CMAI)。结果 (1)与对照组比较,依那普利和缬沙坦组CPI和LVHI明显下降(P<0.01),CMAI显著升高(P<0.01)。普萘洛尔组CMAI明显升高(P<0.05),CPI和LVHI呈下降趋势但未达到统计学意义(P>0.05)。(2)未成年SHR LVHI与CPI呈显著正相关(tr-10.856,r=0.918,P<0.001),CPI、LVHI与CMAI呈显著负相关(前者tr=3.917,r=-0.641,P<0.001;后者tr=4.716,r=-0.709,P<0.001)。结论 (1)未成年SHR即存在心肌细胞增生与凋亡的调节失衡,结果导致心脏重量增加,出现心脏重塑。(2)缬沙坦、依那普利、普萘洛尔对未     

雷米普利对大鼠高血压并发左心室心肌肥厚伴心肌舒张功能不全和血管纤维化的作用

目的探讨雷米普利对舒张性心力衰竭的治疗作用。方法45只雄性Spargue-Dawley大鼠随机分为假手术组、心肌肥厚模型组和雷米普利治疗组。采用腹主动脉缩窄手术制备心肌肥厚模型,造模12周后ig给予雷米普利1mg·kg-1,每天1次,连续12周。颈动脉插管法测定大鼠左心室舒张末压(LVEDP)、左心室收缩压(LVSP)和左心室压变化速率最大值(±dp/dtmax);测定心脏重量指数和左心室重量指数(LVMI);Van Gieson染色法测定心肌间质和心肌血管纤维化程度;实时PCR法测定胶原Ⅰ型和胶原Ⅲ型mRNA表达。结果与假手术组相比,模型组大鼠LVEDP和LVSP分别升高了103.9%和37.7%;LVMI、心肌间质和血管纤维化分别增加了35.5%,306.3%和104.1%;胶原Ⅰ型和胶原Ⅲ型mRNA表达分别上调2.1倍和4.4倍。与模型组大鼠比较,雷米普利组大鼠LVEDP,LVSP和LVMI分别降低了62.5%,27.4%和18.6%;大鼠心肌间质和心肌血管的纤维化分别降低了44.9%和55.6%;心肌组织胶原Ⅰ型和胶原Ⅲ型mRNA表达分别降低了44.8%和67.0%。结论雷米普利能改善高血压并发左心室心肌肥厚伴心肌舒张功能不全大鼠的心肌舒张功能,可能与其延缓心肌纤维化的病理进程有关,提示雷米普利对舒张性心力衰竭可能有一定的治疗作用。     

辛伐他汀对心肌梗死后大鼠心肌间质重构的影响

目的探讨HMG-CoA还原酶抑制剂辛伐他汀对心肌梗死后大鼠心肌间质重构的影响。方法结扎大鼠冠状动脉左前降支建立心肌梗死模型,24h后存活大鼠随机分为心肌梗死组(MI组)、辛伐他汀20mg组(20mg·kg-1·d-1)和40mg组(40mg·kg-1·d-1),另单设假手术组(Sham组)。8wk后检测左、右心室重量指数,心肌组织胶原含量,Ⅰ型、Ⅲ型胶原容积分数(CVF)及Ⅰ/Ⅲ比值,同时测定Ⅰ型、Ⅲ型胶原mRNA表达。结果MI组左、右心室重量指数增加,梗死边缘区Ⅰ型、Ⅲ型胶原容积分数及Ⅰ/Ⅲ比值均增加,Ⅰ型、Ⅲ型胶原mRNA表达增加。两个Sim组的心室重量指数均降低,梗死边缘区Ⅰ型、Ⅲ型胶原容积分数及Ⅰ/Ⅲ比值下降,但仍高于Sham组,Ⅰ型、Ⅲ型胶原mRNA表达亦较MI组降低。结论辛伐他汀能减少梗死边缘区胶原沉积,改善心肌梗死后心肌间质重构。     

二氧化硫对自发性高血压大鼠血压及血管结构的影响

目的研究二氧化硫(SO2)对自发性高血压大鼠(spontaneously hypertensive rat,SHR)血压以及平滑肌细胞增殖的影响。方法4wk♂SHR16只,随机分为SHR对照组(n=8)、SHR+Na2SO3/NaHSO3组(n=8),同样周龄(n=8)正常血压的Wistar-Kyoto(WKY)大鼠8只为正常对照组。5wk后检测各组大鼠血压,应用图像采集与分析系统对Hart′s改良弹力纤维染色的胸主动脉显微形态结构做定量分析,应用免疫组织化学方法检测平滑肌细胞增殖指数。结果9wk时SHR对照组血压高于WKY对照组大鼠(P<0·01);SHR+Na2SO3/NaHSO3组大鼠的血压较SHR对照组降低(P<0·01)。SHR对照组左心室与全心重量比高于WKY对照组大鼠(P<0·05)。SHR对照组胸主动脉中膜厚度与内径之比高于WKY对照组大鼠(P<0·01)。SHR+Na2SO3/NaHSO3组大鼠胸主动脉的中膜压力、中膜厚度与内径之比低于SHR对照组大鼠(P<0·01)。SHR对照组主动脉平滑肌细胞PI高于WKY对照组大鼠(P<0·01),SHR+Na2SO3/NaHSO3组PI低于SHR对照组(P<0·01)。结论SO2通过扩张血管和抑制血管平滑肌细胞增殖,参与缓解自发性高血压的形成及主动脉结构重塑。     

丹参对自发性高血压大鼠心肌Ⅰ和Ⅲ型胶原的影响

目的：了解丹参对自发性高血压大鼠（SHR）心肌纤维化的阻遏作用。方法：实验用WKY大鼠做阴性对照，SHR大鼠分为SHR对照组和丹参治疗组。药物组经灌胃12周后，观察左心室重量指数（LVMI）；采用免疫组织化学方法观察左室心肌中的Ⅰ、Ⅲ型胶原的改变。结果：SHR组LVMI、Ⅰ型和Ⅲ型胶原较WKY组显升高（P＜0．05），而丹参治疗组各指标均较SHR对照组明显下降（P＜0．05）。结论：丹参具有预防和逆转自发性高血压大鼠心肌纤维化作用。     

Inhibition of left ventricular remodelling in spontaneously hypertensive rats by G alpha q-protein carboxyl terminus imitation polypeptide GCIP-27 is not entirely dependent on blood pressure

The G(q)-protein is located at the convergent point in the signal transduction pathway that leads to ventricular remodelling. In G-protein signalling pathways, the carboxyl terminus of the G(alpha)-subunit plays a vital role in G-protein-receptor interaction. The aim of the present study was to explore the effects of a synthetic G(alphaq) carboxyl terminus imitation peptide, namely GCIP-27, on left ventricular (LV) remodelling and blood pressure in spontaneous hypertensive rats (SHR). In the present study, 10, 30 or 90 microg/kg, i.p., GCIP-27 was administered for 8 weeks to SHR. In addition, another two groups of SHR were treated with either 6 mg/kg losartan or vehicle (saline). Wistar-Kyoto rats were used as controls. Systolic blood pressure (SBP) was measured using the standard tail-cuff method once every 2 weeks. At the end of the experiment, the LV mass index (LVMI) was evaluated. In addition, LV structure and function, collagen content, microstructure and ultrastructure were examined using echocardiography, the hydroxyproline assay, routine light microscopy and transmission electron microscopy, respectively. In the losartan- and GCIP-27 (10, 30 and 90 microg/kg)-treated groups, SBP was decreased significantly compared with that of the vehicle (saline) group. However, even at the highest concentration used, the hypotensive effect of GCIP-27 was weaker than that of losartan. For example, after 8 weeks treatment, SBP had decreased by 30.4% in the losartan-treated group compared with decreases of 10.5, 13.1 and 18.5% in the 10, 30 and 90 microg/kg GCIP-27-treated groups, respectively. Both GCIP-27 (10, 30 and 90 microg/kg) and losartan (6 mg/kg) significantly reduced LV posterior wall thickness, the thickness of the interventricular septum, collagen content and LVMI, with the effects of GCIP-27 at all three concentrations tested being greater than those of losartan. In conclusion, GCIP-27 effectively attenuates LV remodelling in SHR and the antiremodelling effect may not be dependent entirely on decreases in blood pressure.     

Gαq-protein carboxyl terminus imitation polypeptide GCIP-27 attenuates proliferation of vascular smooth muscle cells and vascular remodeling in spontaneously hypertensive rats

Gq-protein is located at the convergent point in signal transduction pathways leading to vascular remodeling. The carboxyl terminus of Gα-subunit plays a vital role in G-protein-receptor interaction. The present study was designed to explore the effects of a synthetic Gαq carboxyl terminus imitation peptide, namely GCIP-27, on vascular smooth muscle cells (VSMC) in vitro and vascular remodeling in spontaneous hypertensive rats (SHR). Hyperplasia and hypertrophy of VSMC wre determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, [(3)H]-thymidine and [(3)H]-leucine incorporation, and [Ca(2+)](i) was measured with Fluo-3/AM staining. Systolic blood pressure (SBP), the ratio of media thickness to lumen diameter (MT/LD) of aorta, collagen content, and phospholipase C activity in aorta were measured in SHR. GCIP-27 (3-100 μg/l) significantly decreased proliferation activity, protein content, incorporation of [(3)H]-thymidine and [(3)H]-leucine, and [Ca(2+)](i) level in VSMC. SBP, MT/LD, collagen content, and phospholipase C activity in aorta of SHR were decreased significantly in GCIP-27 (7, 20, 60 μg/kg)-treated groups and losartan (6 mg/kg) group compared with vehicle group. In conclusion, GCIP-27 could inhibit vascular remodeling effectively in vitro and in vivo.     

血管活性肽优洛可定对自发性高血压大鼠血流动力学影响及与L-型钙通道关系研究

目的观察血管活性肽优洛可定(urocortin,UCN)对自发性高血压大鼠(SHR)血流动力学、心肌重构的影响与相关机制。方法 UCN(1、3、6μg·kg-1·d-1)每日经尾静脉注射给予,用药2周,观察其对SHR血流动力学的影响。应用全细胞膜片钳记录技术,观察UCN对SHR大鼠左室心肌细胞L-型钙通道的影响。另外,采用流式细胞仪方法测定心肌细胞内荧光钙含量。结果 UCN能明显改善SHR心脏的收缩及舒张功能,明显降低平均动脉压(AMP)、左室收缩压(LVSP)、左室舒张末压(LVEDP)(P<0.01),升高左心室压力最大变化速率(±dp/dtmax)(P<0.01),在高血压大鼠血流动力学方面起明显改善作用。另外,UCN能明显抑制L-型钙通道开放,降低心肌细胞钙通道电流,减少SHR大鼠心肌细胞内荧光钙离子含量,而促肾上腺皮质激素调节因子2型受体(CRF-2R)阻断剂Astressin(AST)可消除UCN的作用。结论 UCN改善血流动力学及治疗高血压的作用可能是通过与CRF-2R结合,并抑制心肌细胞内L-钙离子通道开放及降低钙含量而实现。     

Urantide对心肌缺血/再灌注损伤的保护作用

目的研究UT受体(urotensinⅡreceptor,UTS2R)拮抗剂——urantide对心肌缺血/再灌注(I/R)损伤的保护作用及其机制。方法大鼠心肌缺血/再灌注损伤采用冠状动脉左前降支结扎和松开法(LAD法)。实验大鼠随机分为6组:假手术组、模型组、urantide3、10、30μg.kg-13个剂量组,以及1.6mg·kg-1维拉帕米(Verapamil,Ver)阳性药对照组。除假手术组外,其余组别大鼠均实施30min缺血,60min再灌注。受试药于缺血前10min经舌下静脉给药,记录心肌缺血/再灌注过程中各组心率和心电图ST段变化值。实验结束后,测定大鼠血清中MDA、NO的含量以及NOS、LDH的活性;取心脏行伊文思兰和TTC双染色,计算IS/AAR。另取一批大鼠,实验方法同前。实验结束后剪取左心室缺血区,提取蛋白后采用Westernblot方法检测iNOS的蛋白表达情况。结果urantide(10,30μg.kg-1)对心率无明显影响,但可明显抑制缺血/再灌注后心电图ST段的抬高;明显降低血清中MDA的含量和LDH的活性,明显升高血清中NO总量和总的NOS活性;同时明显降低IS/AAR。3μg.kg-1urantide预处理对上述指标均无影响。Westernblot显示urantide(10,30μg.kg-1)能抑制iNOS的表达。结论urantide对心肌缺血/再灌注损伤具有保护作用,作用机制可能与抗脂质过氧化、促进NO合成有关。     

Urantide对大鼠心肌缺血/再灌注后心肌细胞凋亡的作用及机制研究

目的观察urantide对大鼠缺血/再灌注心肌组织氧化应激损伤的作用和心肌细胞凋亡的影响及其与PI3K/Akt及PKC信号通路的关系。方法可逆性冠脉左前降支结扎造成心肌缺血/再灌注模型,给予大鼠心脏缺血30 min再灌注90 min。80只大鼠随机分为假手术组、缺血/再灌注(I/R)组、urantide低、中、高剂量组(3,10,30μg.kg-1)、维拉帕米对照组(1.6 mg.kg-1)、urantide+CHE组(30μg.kg-1+1 mg.kg-1)、urantide+LY294002组(30μg.kg-1+0.3 mg.kg-1)。Urantide低、中、高剂量组中urantide于缺血前5 min舌下静脉1 min内一次性推注,urantide+CHE组与urantide+LY294002组中,在穿线稳定后舌下静脉分别快速推注CHE与LY294002,5 min后舌下静脉快速推注uran-tide 30μg.kg-1,稳定10 min后再行缺血/再灌注操作。实验结束后测定大鼠血清中超氧化物歧化酶(SOD)、一氧化氮合酶(NOS)活力和丙二醛(MDA)含量以及一氧化氮(NO)含量。TUNEL法检测凋亡细胞指数(AI),免疫组化法检测心肌组织Bcl-2、Bax的蛋白表达。结果与I/R组相比,urantide 30μg.kg-1能明显升高SOD活性(P<0.01),明显减少血清中MDA的含量(P<0.05),明显提高NOS活力(P<0.01),使NO含量增加(P<0.01);Bax蛋白表达和心肌细胞凋亡指数降低(P<0.01),Bcl-2蛋白表达增加(P<0.05);urantide+CHE组与urantide+LY294002组与urantide30μg.kg-1组相比,SOD活力和NO含量下降,MDA含量上升,心肌组织中Bax蛋白表达和心肌细胞凋亡指数上升,而Bcl-2蛋白表达下降,与I/R组比较差异无统计学意义(P>0.01)。结论 Urantide能够通过激活PKC和PI3K/Akt信号转导通路,减少心肌组织氧自由基的含量,进一步调控Bcl-2和Bax蛋白的表达,抑制心肌缺血/再灌注大鼠心肌细胞的凋亡,从而对大鼠心肌缺血/再灌注具有一定保护作用。     

培哚普利,普萘洛尔与双氢氯噻嗪对自发性高血压大鼠心血管结？…

AIM: To investigate the effects of perindopril, propranolol, and dihydrochlorothiazide on artery wall thickening, left ventricular hypertrophy, and cardiac fibrosis in spontaneously hypertensive rats (SHR). METHODS: After measurement of systolic blood pressure (SBP), 16-wk-old Male SHR were randomly divided into 3 groups (each n = 10), given perindopril (Per, 5 mg.kg-1.d-1), propranolol (Pro, 40 mg.kg-1.d-1), dihydrochlorothiazide (DCT, 100 mg.kg-1.d-1) respectively by gavage for 12 wk. Sex-, age-, and number-matched untreated SHR and normotensive Wistar Kyoto rats (WKY) served as controls. When the treatment finished, body weights (BW) and SBP were measured before decapitation of the rats. The heart was excised rapidly, the left ventricle was weighed and then subjected to collagen content analysis. Vascular wall and lumen ratio from aorta, renal arteries and branch III vessels of mesenteric arteries were determined morphometrically. RESULTS: Treated rats in 3 groups showed a lower SBP and the ratio of left ventricle weight to body weight (LVW/BW) compared with WKY. Artery wall thickening was similarly inhibited in the treated groups. Per and Pro inhibited cardiac fibrosis, but collagen concentration increased in DCT treated SHR [collagen volume fraction (CVF): 19 +/- 4 vs SHR 14 +/- 4, P < 0.05; perivascular collagen fraction(PVCF): 84 +/- 7 vs SHR 79 +/- 5, P < 0.05]. CONCLUSION: Per and Pro inhibited, but DCT promoted, cardiac fibrosis.     

广西眼镜蛇毒中降压因子对自发性高血压模型大鼠血压的影响

目的:研究从广西眼镜蛇毒中分离纯化得到的降压因子(HF)对自发性高血压模型大鼠(SHR)血压的影响。方法:将SHR和正常大鼠各随机分为空白对照组、卡托普利组及HF低、中、高3个剂量组(40、80、160μg.kg-1)共5组(n=6) ,静脉注射相应试药,采用BL-420生物信号分析系统测定大鼠收缩压。结果:静脉注射不同剂量的HF均能降低SHR和正常大鼠收缩压,低、中、高3个剂量组的最大降压值分别为20.9、23.91、30.58mmHg ,与给药前比较均具有显著性差异(P<0.01)。结论:广西眼镜蛇毒中HF对SHR和正常大鼠有明显的降血压作用。