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• W2187945932 startingPage "R255" @default.
• W2187945932 abstract "The cytochrome P-450 4A (CYP4A)-derived arachidonic acid metabolite 20-hydroxyeicosatetraenoic acid (20-HETE) affects renal tubular and vascular functions and has been implicated in the control of arterial pressure. We examined the effect of antisense oligonucleotide (ODN) to CYP4A1, the low K(m) arachidonic acid omega-hydroxylating isoform, on vascular 20-HETE synthesis, vascular reactivity, and blood pressure in the spontaneously hypertensive rat (SHR). Administration of CYP4A1 antisense ODN decreased mean arterial blood pressure from 137 +/- 3 to 121 +/- 4 mmHg (P < 0.05) after 5 days of treatment, whereas treatment with scrambled antisense ODN had no effect. Treatment with CYP4A1 antisense ODN reduced the level of CYP4A-immunoreactive proteins along with 20-HETE synthesis in mesenteric arterial vessels. Mesenteric arteries from rats treated with antisense ODN exhibited decreased sensitivity to the constrictor action of phenylephrine (EC(50) 0.69 +/- 0.17 vs. 1.77 +/- 0.40 microM). Likewise, mesenteric arterioles from antisense ODN-treated rats revealed attenuation of myogenic constrictor responses to increases of transmural pressure. The decreased vascular reactivity and myogenic responses were reversible with the addition of 20-HETE. These data suggest that CYP4A1-derived 20-HETE facilitates myogenic constrictor responses in the mesenteric microcirculation and contributes to pressor mechanisms in SHR." @default.
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• W2187945932 date "2001-01-01" @default.
• W2187945932 modified "2023-10-17" @default.
• W2187945932 title "CYP4A1 antisense oligonucleotide reduces mesenteric vascular reactivity and blood pressure in SHR" @default.
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• W2187945932 doi "https://doi.org/10.1152/ajpregu.2001.280.1.r255" @default.
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