Hepatic uptake and clearance

Hepatic uptake and clearance refers to the complex physiological process by which the liver removes substances, including drugs, from the bloodstream. This vital pharmacokinetic process involves the coordinated action of various molecular entities, primarily drug transporters located on hepatocyte membranes and drug-metabolizing enzymes within hepatocytes. Substances are first taken up into liver cells (hepatocytes) by specific uptake transporters, such as Organic Anion Transporting Polypeptides (OATPs) and Organic Cation Transporters (OCTs). Once inside, they can be chemically modified by enzymes, notably the Cytochrome P450 (CYP) family, and subsequently excreted into bile via efflux transporters like Multidrug Resistance-Associated Proteins (MRPs), or returned to the bloodstream. This process is critical for determining a drug's bioavailability, half-life, and overall exposure in the body. Dysregulation of hepatic uptake and clearance, often due to genetic variations, liver disease, or drug-drug interactions, can lead to significant alterations in drug pharmacokinetics, potentially causing drug accumulation and toxicity or insufficient therapeutic effects.

Other names

Hepatic drug dispositionHepatic eliminationDrug clearance by the liver