What are P-glycoprotein substrates?
Examples of drugs that are substrates of P-gp efflux pump include: Apixaban, colchicine, cyclosporine, dabigatran, digoxin, edoxaban, rivaroxaban, and tacrolimus. The degree of effect on P-gp substrate serum concentration may be altered by dose and timing of orally administered P-gp inhibitor or inducer.
How do you reduce P-gp efflux?
They also suggest structural changes that might lower PGP efflux, these include reducing the pKa of amines, reducing the number of potential hydrogen bonding interactions, either by removing heteroatoms or increasing steric hindrance.
Does azithromycin inhibit P-glycoprotein?
Macrolides: Erythromycin, Azithromycin, and Clarithromycin The FDA approved macrolide antibiotics (erythromycin, azithromycin, and clarithromycin) were all reported as p-gp inhibitors. This has been supported by many studies in the literature (64–66).
Is omeprazole a P-gp inhibitor?
Other examples of drugs dependent on CYP3A4 for their metabolism are escitalopram, warfarin, oxycodone, tramadol, and oxymorphone. The concentrations of these drugs may increase if they are used concomitantly with omeprazole. Omeprazole is also a competitive inhibitor of p-glycoprotein, as are other PPIs.
What does it mean if a drug is a substrate?
substrates are drugs or other substances (xenobiotics) which are metabolized by cytochrome enzymes including 1. pharmacologically active drugs which require metabolism to inactive form for clearance from the body.
Is P-glycoprotein the same as MDR1?
MDR1, more commonly referred to as P-gp or P-glycoprotein, is an efflux transporter that serves two major drug transport functions. Its role in modulating the tissue distribution of drugs is well established, particularly with respect to CNS exposure.
What is the role of P-glycoprotein?
P-glycoprotein is one of the drug transporters that determine the uptake and efflux of a range of drugs. P-glycoprotein functions as a transmembrane efflux pump, pumping its substrates from inside to outside the cell. Drugs which induce or inhibit P-glycoprotein can interact with other drugs handled by the pump.
Is amiodarone a Pgp inhibitor?
Amiodarone, a potent inhibitor of P-gp, increased mean serum digoxin levels from 0.97 to 1.98 μg/l when administered orally at doses of 600 to 1,600 mg/day (15). Oral amiodarone inhibits intestinal P-gp membrane efflux of digoxin and its secretion from renal tubules (15).
What happens if P-glycoprotein is inhibited?
Like the enzymes involved in drug metabolism, substrates of P-glycoprotein can potentially act as inhibitors or inducers of its function. Inhibition of P-glycoprotein can result in increased bioavailability of the susceptible drug. Induction of P-glycoprotein reduces the bioavailability.
