Demonstration of proof of mechanism and pharmacokinetics and pharmacodynamic relationship with 4 '-cyano-biphenyl-4-sulfonic acid (6-amino-pyridin-2-yl)-amide (PF-915275), an inhibitor of 11 beta-hydroxysteroid dehydrogenase type 1, in cynomolgus monkeys

Research output: Contribution to journalArticle


  • BG Bhat
  • N Hosea
  • A Fanjul
  • J Herrera
  • J Chapman
  • F Thalacker
  • PA Rejto

Colleges, School and Institutes


Glucocorticoids, through activation of the glucocorticoid receptor (GR), regulate hepatic gluconeogenesis. Elevated hepatic expression and activity of 11 beta-hydroxysteroid dehydrogenase type 1 (11 beta HSD1) play a key role in ligand-induced activation of the GR through the production of cortisol. Evidence from genetically modified mice suggests that inhibition of 11 beta HSD1 might be a therapeutic approach to treat the metabolic syndrome. We have identified a potent 11 beta HSD1 inhibitor, 4 '-cyano-biphenyl-4- sulfonic acid (6-amino-pyridin-2-yl)-amide (PF-915275), that is selective for the primate and human enzymes. The objective of this study was to demonstrate target inhibition with PF-915275 and to quantify the relationship between target inhibition and drug exposure in monkeys. We characterized the ability of PF-915275 to inhibit the conversion of prednisone, a synthetic cortisone analog that can be distinguished from the endogenous substrate cortisone, enabling a direct measure of substrate to product conversion without the complication of feedback. Adult cynomolgus monkeys were administered either vehicle or various doses of PF-915275 followed by a 10-mg/kg dose of prednisone. Prednisone conversion to prednisolone and the concentrations of PF-915275 were measured by liquid chromatography/tandem mass spectrometry. PF-915275 dose-dependently inhibited 11 beta HSD1-mediated conversion of prednisone to prednisolone, with a maximum of 87% inhibition at a 3-mg/kg dose. An exposure-response relationship was demonstrated, with an estimated EC50 of 391 nM (total) and 17 nM (free). Insulin levels were also reduced in a dose-related manner. These results should enable the development of a biomarker for evaluating target modulation in humans that will aid in identifying 11 beta HSD1 inhibitors to treat diabetes and other related metabolic diseases.


Original languageEnglish
Pages (from-to)299-305
Number of pages7
JournalJournal of Pharmacology and Experimental Therapeutics
Issue number1
Publication statusPublished - 1 Jan 2008

Sustainable Development Goals