Enzyme-selective effects of nitric oxide on affinity and maximum velocity of various rat cytochromes P450.

DMD #3848 ENZYME-SELECTIVE EFFECTS OF NITRIC OXIDE ON AFFINITY AND MAXIMUM VELOCITY OF VARIOUS RAT CYTOCHROMES P450 Ragini Vuppugalla and Reza Mehvar

Short-term inhibitory effects of nitric oxide on cytochrome P450-mediated drug metabolism: time dependency and reversibility profiles in isolated perfused rat livers.

Nitric oxide (NO) is implicated as a mediator in the decreased catalytic activities of cytochrome P450 (P450) enzymes during inflammation or infection. Here, we examined the time course and the reversibility of the NO effect on P450s using isolated perfused rat livers. Livers were perfused at a constant rate with the NO donor sodium nitroprusside (SNP) for 0.5 or 1 h, followed by washout period...

Down-regulation of the expression of three major rat liver cytochrome P450S by endotoxin in vivo occurs independently of nitric oxide production.

Endotoxemia results in both the down-regulation of multiple cytochrome P450 genes and the induction of inducible nitric oxide synthase (NOS2). The nitric oxide (NO) released during inflammation has been implicated as the mediator of the decreased catalytic activity and expression of several cytochrome P450 isozymes. We examined the role of NO in the decreases of both gene expression and activit...

Effects of Paracetamol on NOS, COX, and CYP Activity and on Oxidative Stress in Healthy Male Subjects, Rat Hepatocytes, and Recombinant NOS

Paracetamol (acetaminophen) is a widely used analgesic drug. It interacts with various enzyme families including cytochrome P450 (CYP), cyclooxygenase (COX), and nitric oxide synthase (NOS), and this interplay may produce reactive oxygen species (ROS). We investigated the effects of paracetamol on prostacyclin, thromboxane, nitric oxide (NO), and oxidative stress in four male subjects who recei...

Determination of Optimum Conditions for the Production of Peptides with Antioxidant and Nitric-Oxide Inhibition Properties from Protein Hydrolysis of Pumpkin Seed Meals Using Pepsin Enzyme

Background and Objectives: In this study, hydrolysis condition optimization of the pumpkin (Cucurbita pepo) seed proteins was carried out achieve maximum DPPH radical scavenging and nitric-oxide inhibition properties using Design Expert Software and response surface methodology.  Materials & Methods: In general, 1–3% concentrations of pepsin enzyme, 30–40 °C temperature and 120–100 min time we...