Abstract
20-hydroxyeicosatetraenoic acid (20-HETE), the ω-hydroxylation product of arachidonic acid (AA), is the principal metabolite formed in tubular and vascular structures of the rat renal cortex and outer medulla. 20-HETE has potent biological activities and has been shown to contribute to the regulation of renal function and to the control of arterial pressure. In the renal tubules it inhibits sodium reabsorption, while in the renal microcirculation it is a vasoconstrictor and a regulator of the myogenic response. The ω-hydroxylation of fatty acids, including AA, is catalyzed by enzymes of the cytochrome P450 (CYP) 4A family. In the rat, four isoforms have been identified: CYP4A1, 4A2, 4A3, and 4A8. Our studies indicated that despite the high homology, these isoforms display distinct catalytic properties including differences in kinetic parameters, product profile and inhibitor sensitivity. While the constitutive level of expression of CYP4A1 is low, its recombinant form is the low Km AA-ω-hydroxylase and thus, by far, the most efficient 20-HETE synthesizing enzyme. Whereas CYP4A1 is solely an AA whydroxylase, CYP4A2 and CYP4A3 also catalyze AA 11,12-epoxidation. Systemic administration of CYP4A antisense oligodeoxynucleotides revealed that CYP4A1 contributes significantly to the renal tubular and vascular production of 20-HETE. Furthermore, these isoforms demonstrate unique intrarenal localization. Using molecular and pharmacological probes we demonstrated a unique CYP4A isoform-specific localization within the renal microvasculature. Transfection of CYP4A1 cDNA to renal microvessels resulted in enhanced 20-HETE synthesis and increased reactivity to phenylephrine. Thus, 20-HETE of vascular origin serves as a stimulatory regulator of vascular responses to constrictor agonists.
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Schwartzman, M.L., Marji, J., Jiang, M., Wang, MH. (2001). Synthesis and Function of 20-Hydroxyeicosatetraenoic Acid in the Kidney. In: Samuelsson, B., Paoletti, R., Folco, G.C., Granström, E., Nicosia, S. (eds) Advances in Prostaglandin and Leukotriene Research. Medical Science Symposia Series, vol 16. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9721-0_17
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DOI: https://doi.org/10.1007/978-94-015-9721-0_17
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