The clinical practice of modulating the rate and pathways through which the body inactivates and eliminates the primary glucocorticoid, cortisol. Tuning implies adjusting the enzymatic activity, particularly involving hepatic and peripheral reductases and transferases, to maintain optimal cortisol clearance rates. This prevents excessive tissue exposure or inappropriate metabolite accumulation.
Origin
This concept arises from pharmacokinetics applied to endogenous steroids, focusing on the “metabolism” or breakdown/conjugation of cortisol. “Tuning” suggests a precise, dynamic adjustment rather than simple suppression or replacement. It acknowledges that the speed of clearance is as important as the circulating concentration.
Mechanism
The mechanism centers on influencing liver enzymes like 5-alpha and 5-beta reductases, which convert active cortisol to inactive tetrahydrocortisol metabolites. Supporting the function of these detoxification pathways, often through nutritional cofactors or specific therapeutic agents, alters the half-life of active cortisol. This targeted modulation ensures that systemic cortisol activity aligns with the required physiological demands of the patient.
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