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Receptor-mediated methylprednisolone pharmacodynamics in rats: Steroid-induced receptor down-regulation

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Abstract

Several approaches to receptor down-regulation were examined to extend previous receptor/ genemediated pharmacokinetic/dynamic models of corticosteroids. Down-regulation of the glucocorticoid receptor was considered as an instantaneous event or as a gradual steroid-receptor-mediated process. Concentrations of plasma methylprednisolone, free hepatic cytosolic receptors, and the activity of hepatic tyrosine aminotransferase (TAT) enzyme were measured for 16 hr following administration of 0, 10, and 50 mg/kg methylprednisolone sodium succinate to 93 adrenalectomized rats. Receptor down-regulation was best described by a fractional decrement in the rate of return of free cytosolic glucocorticoid receptor. Predicted values for free receptor, bound receptor, nuclear bound receptor, and transfer compartments were in accord with the expected rank order values based on the high and low steroid doses. Model parameter estimates were independent of dose and described the rapid depletion of free cytosolic receptor, latephase return of cytosolic receptor to a new baseline level that was 20–40% lower than control, and the TAT induction/dissipation pattern following steroid dosing. The microscopic association and dissociation constants describing the steroidreceptor interaction were 0.23 L/nmole per hr (kon and 4.74 hr−1 (koff) for methylprednisolone compared to previously obtained values of 0.20 L/nmole per hr and 15.7 hr−1 for the related steroid prednisolone. The time course of TAT induction was similar to that observed previously for prednisolone. Efficiency of TAT induction was more closely related to steroid receptor occupancy than plasma methylprednisolone concentrations due to receptor saturability and receptor recycling.

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  1. David B. Haughey

    Present address: Oneida Research Services, Whitesboro, New York

Authors and Affiliations

  1. Department of Pharmaceutics, School of Pharmacy, State University of New York at Buffalo, 14260, Buffalo, New York

    David B. Haughey & William J. Jusko

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  1. David B. Haughey
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Supported in part by Grant No. 24211 from the National Institutes of General Medical Sciences, NIH, and by a Fellowship from the American Foundation for Pharmaceutical Education for D.H.

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Haughey, D.B., Jusko, W.J. Receptor-mediated methylprednisolone pharmacodynamics in rats: Steroid-induced receptor down-regulation. Journal of Pharmacokinetics and Biopharmaceutics 20, 333–355 (1992). https://doi.org/10.1007/BF01062462

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  • DOI: https://doi.org/10.1007/BF01062462

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