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- W2327870009 abstract "20-Hydroxyeicosatetraenoic acid (20-HETE), a potent vasoconstrictor and mediator of the myogenic response, is a major arachidonic acid metabolite in the microvasculature of the rat kidney formed primarily by the cytochrome P-450 (CYP) 4A isoforms, CYP4A1, CYP4A2, and CYP4A3. We examined CYP4A isoform expression and 20-HETE synthesis in microdissected interlobar, arcuate, and interlobular arteries; mRNA for all CYP4A isoforms was identified by RT-PCR. Western blot analysis indicated that the levels of CYP4A2/4A3-immunoreactive protein increased with decreased arterial diameter, whereas those of CYP4A1-immunoreactive protein remained unchanged. 20-HETE synthesis was the highest in the interlobular arteries (17 +/- 1.62 nmol. mg(-1). h(-1)) and, like CYP4A2/4A3-immunoreactive protein, decreased with increasing vessel diameter (4.5 +/- 1.21, 2.65 +/- 0.58, and 0.81 +/- 0.14 nmol. mg(-1). h(-1) in the arcuate, interlobar, and segmental arteries, respectively). 20-HETE synthesis in the renal artery and the abdominal aorta was undetectable. The observed decreased immunoreactivity of NADPH-cytochrome P-450 (c) oxidoreductase with increased arterial diameter provided a possible explanation for the decreased capacity to generate 20-HETE in the large arteries. The increase in CYP4A isoform expression and 20-HETE synthesis with decreasing diameter along the preglomerular arteries and the potent biological activity of 20-HETE underscore the significance of 20-HETE as a modulator of renal hemodynamics." @default.
- W2327870009 created "2016-06-24" @default.
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- W2327870009 date "2002-07-01" @default.
- W2327870009 modified "2023-09-25" @default.
- W2327870009 title "Cytochrome<i>P</i>-450 4A isoform expression and 20-HETE synthesis in renal preglomerular arteries" @default.
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- W2327870009 doi "https://doi.org/10.1152/ajprenal.00265.2001" @default.
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