Colfibrate attenuates blood pressure and sodium retention in DOCA-salt hypertension.

Colfibrate attenuates blood pressure and sodium retention in DOCA-salt hypertension.
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DOI:
10.1038/ki.2008.300
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发表时间:
2008-10
影响因子:
19.6
通讯作者:
Wang, Mong-Heng
Wang, Mong-Heng
中科院分区:
医学1区
文献类型:
--
作者:
Zhou, Yiqiang;Luo, Pengcheng;Chang, Hsin-Hsin;Huang, Hui;Yang, Tianxin;Dong, Zheng;Wang, Cong-Yi;Wang, Mong-Heng

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氯贝特是一种过氧化物酶体增殖物激活受体α(PPAR α)激动剂,可增加肾小管细胞色素P450 4a(Cyp 4a)表达,从而增加20-羟基二十碳四烯酸(20-HETE)的产生。为了确定氯贝丁酯是否影响血压调节,我们研究了野生型和PPARalpha敲除小鼠中DOCA-盐诱导的高血压小鼠。用DOCA盐处理的野生型小鼠具有较高的平均动脉压和较高的累积钠平衡,但肾20-HETE产生低于载体处理的小鼠。用氯贝特治疗DOCA盐小鼠减弱了平均动脉压和累积钠平衡的增加,同时增加了20-HETE的产生和肾脏Cyp 4a的表达。相比之下,用氯贝特和DOCA-盐处理的PPARalpha敲除小鼠在血压、累积钠平衡、肾20-HETE产生或Cyp 4a蛋白表达的增加方面没有表现出减弱。近端小管中的PPAR α蛋白表达高于肾微血管。我们的研究结果表明,在DOCA盐处理的小鼠中,PPAR α途径诱导肾小管20-HETE产生,其影响钠潴留和血压调节。
Clofibrate, a peroxisome proliferator-activated receptor-alpha (PPAR alpha) agonist, increases renal tubular cytochrome P450 4a (Cyp4a) expression thereby increasing 20-hydroxyeicosatetraenoic acid (20-HETE) production. To determine if clofibrate affects blood pressure regulation we studied mice with DOCA-salt induced hypertension in wild-type and PPAR alpha knockout mice. Wild-type mice treated with DOCA-salt had higher mean arterial pressures and higher cumulative sodium balance, but lower renal 20-HETE production than did vehicle-treated mice. Treating DOCA-salt mice with clofibrate attenuated the increase in mean arterial pressure and cumulative sodium balance while increasing 20-HETE production and renal Cyp4a expression. In contrast the PPAR alpha knockout mice treated with clofibrate and DOCA-salt showed no attenuation in the increase of blood pressure, cumulative sodium balance, renal 20-HETE production or Cyp4a protein expression. Expression of the PPAR alpha protein was greater in proximal tubules than in renal microvessels. Our results show that PPAR alpha pathway induces renal tubular 20-HETE production which affects sodium retention and blood pressure regulation in DOCA-salt-treated mice.
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