坎沙曲联合缬沙坦与奥帕曲拉均减轻大鼠心肌肥厚  

Candoxatril combined losartan and omapatrilat decreases myocardial hypertrophy in rats

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作  者:郑亚萍[1] 王兴红[1] 

机构地区:[1]漯河医学高等专科学校生理教研室,河南漯河462002

出  处:《基础医学与临床》2012年第8期921-925,共5页Basic and Clinical Medicine

基  金:河南省教育厅自然科学研究计划项目(2009C180002)

摘  要:目的比较坎沙曲联合缬沙坦与奥帕曲拉(OMA)对大鼠心肌肥厚的保护作用。方法注射1 mg/kg异丙肾上腺素(ISO)制备大鼠心肌肥厚模型,随机分为对照组、心肌肥厚组、坎沙曲组、缬沙坦组、OMA组与坎沙曲+缬沙坦(半量及全量)组,每组n=8,染色后测定心肌细胞横截面积、心肌间质胶原容积分数及血管周围胶原面积;免疫组化学检测心肌组织p-PI3K和p-Akt表达;放免法测定血浆血管紧张素Ⅱ(AngⅡ)、心房利钠肽(ANP)、缓激肽(BK)水平。结果 1)坎沙曲+缬沙坦(全量)及OMA组均可降低心肌肥厚组大鼠心脏重量指数(分别为3.64±0.30、3.62±0.28和4.32±0.58)、心肌细胞横截面积、心肌间质胶原容积分数及血管周围胶原面积的明显上升(P<0.01),两组间无明显差异。2)与心肌肥厚组相比,坎沙曲+缬沙坦(全量)及OMA组均可降低血浆AngⅡ含量[分别为(741±89)、(682±66)和(479±62)ng/L],并显著上调ANP[分别为(117±33)、(298±91)和(288±95)μg/L]及BK[分别为(124±12)、(232±21)和(309±24)ng/L]水平(P<0.01),但坎沙曲+缬沙坦(全量)较OMA组BK的上调幅度低。3)坎沙曲+缬沙坦(全量)与OMA均下调心肌肥厚组心肌组织p-PI3K和p-Akt蛋白表达,且两者间无明显差异。结论坎沙曲联合缬沙坦与OMA均可减轻大鼠心肌肥厚,但对血浆激素水平的影响有差异。Objective To compare the protective effect of candoxatril combined losartan on rat myocardial hypertrophy with omapatrilat (OMA). Methods 1 mg/kg isoproterenol (ISO) was given to induce myocardial hypertrophy in Sprague-Dawley (SD) rats. Rats were randomly divided into 7 groups: control, myocardial hypertrophy, candoxatril, losartan, OMA, candoxatril + losartan(full dose and half-value dose) (all n = 8 ). The myocardial hypertrophy index was expressed as heart weight/body weight (HW/BW), cross-sectional area (CSA), myocardial interstitial collagen volume fraction (CVF) and perivascular collagen area (PVCA) ; The content of plasma angio- tensin Ⅱ (Ang Ⅱ ), atrial natriuretic peptide (ANP)and bradykinin (BK)were measured by colorimetry and radio- immunoassay ;The expression of p-PI3K and p-Akt protein were detected by immunohistochemistry staining. Results1 )ISO significantly increased heart weight index(3.64 ±0. 30, 3.62±0. 28, 4. 32 ±0. 58 respectively), CSA, CVF, PVCA (P 〈0. 01 ) ; candoxatril + losartan(full dose) and OMA decreased the effect of ISO (P 〈0. 01 ). 2)ISO in- creased Angllcontent[ (741±89), (682 ±66) and(479 ±62)ng/L respectively] significantly and ANP and BK level. Compared to myocardial hypertrophy control group, candoxatril + losartan (full dose)and OMA both decreased plas- ma AngⅡ content and increased the ANP [ ( 117 ± 33 ), ( 298± 91 ), ( 288 ± 95 ) μg/L respectively ] and BK [ ( 124 ± 12), (232± 21 ) and (309 ± 24) ng/L respectively ] level significantly ( P 〈 0. 01 ), but candoxatril + losartan make less BK level increase than OMA(P 〈0. 05). 3) OMA down-regulated the expression of p-PI3K, p-Akt protein which is not better than candoxatril + losartan(full dose). Conclusions Candoxatril combined losartan and OMA decrease myocardial hypertrophy in rats. There were differences in the plasma hormone level.

关 键 词:心肌肥厚 坎沙曲 奥帕曲拉 缬沙坦 缓激肽 

分 类 号:R541[医药卫生—心血管疾病]

 

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