Select Page




Metabolism & Transporter

What is the Metabolism and Transporter Module?

The Metabolism and Transporter Module is an optional module that extends the capabilities of GastroPlus® to include nonlinear pharmacokinetics into any compartment (gut, liver, and/or any PBPK tissue), along with metabolite tracking. This module calculates Michaelis-Menten rates for gut and liver (or any PBPK tissue) metabolism and for carrier-mediated transport (influx or efflux – again, for any tissue in a PBPK model) based on input values for Vmax and Km.

The Metabolism and Transporter Module includes a Units Converter tool for easy transformation of a variety of your in vitro metabolism or transporter kinetic parameters into values and units that can be utilized by the GastroPlus PBPK model.


You can provide Vmax and Km values for each enzyme/ transporter independently, or you can lump them into a single effective Vmax and Km, depending on your data. The distribution factors on the Physiology tab are automatically loaded for recognized gut enzymes and transporters, and provide the relative amounts of enzymes or transporters in the various ACAT™ gut model compartments. The Vmax and Km scale factors on the Pharmacokinetics tab are provided to allow fitting nonlinear kinetic models to your data.