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Novel renal arachidonate metabolites
M A Carroll1, M Schwartzman, D Sacerdoti
1Department of Pharmacology, New York Medical College, Valhalla 10595.
The American Journal of the Medical Sciences
|April 1, 1988
Summary
Cells metabolize arachidonic acid (AA) into active compounds that affect blood vessels and heart function. Hypertension increases the production of these specific AA metabolites in the kidneys and cornea.
Area of Science:
- Biochemistry
- Renal Physiology
- Vascular Biology
Background:
- Thick ascending limb of Henle cells metabolize arachidonic acid (AA) via cytochrome P450.
- This metabolism yields biologically active products, P1 and P2, with distinct functions.
- P1 relaxes blood vessels; P2 inhibits cardiac Na+-K+-ATPase.
Purpose of the Study:
- Investigate AA metabolism in hypertensive models.
- Identify and characterize AA metabolites in renal and corneal cells.
- Determine the role of these metabolites in hypertension.
Main Methods:
- Reverse-phase High-Performance Liquid Chromatography (HPLC) to separate AA metabolites.
- Analysis of AA metabolism in mTALH cells from hypertensive rabbits.
- Study of AA metabolites in bovine corneal epithelium.
- Examination of renal microsomes from spontaneously hypertensive rats (SHRs).
Main Results:
- Hypertension in rabbits selectively increased P1 and P2 formation in mTALH cells.
- Bovine corneal epithelium produces AA metabolites similar to mTALH cells, including 12(R)hydroxyeicosatetraenoic acid (12(R) HETE).
- 12(R) HETE inhibits Na+-K+-ATPase activity.
- SHRs exhibit increased formation of three principal AA metabolites during hypertension development.
Conclusions:
- AA metabolism in TALH cells produces vasoactive and cardiotoxic compounds.
- Elevated levels of specific AA metabolites are associated with hypertension.
- Corneal AA metabolites share similarities with renal metabolites and may play a role in cardiovascular regulation.