PMID: 7526055Aug 1, 1994Paper

Role of the cytochrome P450 enzyme system as a humoral modulator of vasomotor responses in rat renal vasculature

Journal of Cardiovascular Pharmacology
A O Oyekan

Abstract

This study was conducted to examine regulation of vasomotor tone by cytochrome (cyt) P450 enzymes. Isolated perfused rat kidney was used to examine the vasoconstrictor responses to KCl, phenylephrine (PE), and 5-hydroxytryptamine (5-HT) in the presence of inhibitors of cytP450 enzymes. Vasoconstriction elicited by KCl 2.5-7.5 mg, PE 0.1-1.0 microgram, and 5-HT 10-50 ng was attenuated dose dependently after acute inhibition of cytP450 enzymes with alpha NF 2.5-10 microM and clotrimazole 0.1-3.0 microM. Similarly, depletion of cytP450 enzymes with CoCl2 significantly inhibited the vasoconstrictor responses to KCl and PE. These inhibitory effects were greater against KCl and PE, suggesting that release of endogenous arachidonic acid (AA) and its conversion to cytP450 vasoconstrictor products by these agonists may contribute to their vasoconstrictor activities. The renal microsomal oxidation of ethylene glycol to formaldehyde (cytP450IIE1 activity) was markedly inhibited by these inhibitors. In addition, conversion of radiolabeled AA ([14C]AA) by the indomethacin-treated kidney was reduced by CoCl2. Without indomethacin added, exogenous AA amplified vasoconstrictor responses whereas, with indomethacin added, AA attenuated vasoconst...Continue Reading

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.