Use of endogenous cholesterol and its metabolite as markers of cyp450 metabolic activity

This article analyzes the application of the method for determining the activity of CYP3A4 by determining the concentration of endogenous cholesterol and its metabolite/4β-hydroxycholine in blood plasma. It also provides information on the convergence assessment of data obtained using alternative methods for determining the activity of the same CYP450 isoenzyme (CYP3A4) using different substrates: cholesterol and cortisol.