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Sökning: WFRF:(Ceuppens P.)

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  • Gutierrez, P. Morentin, et al. (författare)
  • Continuous inhibition of 11 beta-hydroxysteroid dehydrogenase type I in adipose tissue leads to tachyphylaxis in humans and rats but not in mice
  • 2015
  • Ingår i: British Journal of Pharmacology. - : Wiley. - 0007-1188 .- 1476-5381. ; 172:20, s. 4806-4816
  • Tidskriftsartikel (refereegranskat)abstract
    • Background and Purpose11-hydroxysteroid dehydrogenase type I (11-HSD1), a target for Type 2 diabetes mellitus, converts inactive glucocorticoids into bioactive forms, increasing tissue concentrations. We have compared the pharmacokinetic-pharmacodynamic (PK/PD) relationship of target inhibition after acute and repeat administration of inhibitors of 11-HSD1 activity in human, rat and mouse adipose tissue (AT). Experimental ApproachStudies included abdominally obese human volunteers, rats and mice. Two specific 11-HSD1 inhibitors (AZD8329 and COMPOUND-20) were administered as single oral doses or repeat daily doses for 7-9days. 11-HSD1 activity in AT was measured ex vivo by conversion of H-3-cortisone to H-3-cortisol. Key ResultsIn human and rat AT, inhibition of 11-HSD1 activity was lost after repeat dosing of AZD8329, compared with acute administration. Similarly, in rat AT, there was loss of inhibition of 11-HSD1 activity after repeat dosing with COMPOUND-20 with continuous drug cover, but effects were substantially reduced if a drug holiday' period was maintained daily. Inhibition of 11-HSD1 activity was not lost in mouse AT after continuous cover with COMPOUND-20 for 7days. Conclusions and ImplicationsHuman and rat AT, but not mouse AT, exhibited tachyphylaxis for inhibition of 11-HSD1 activity after repeat dosing. Translation of observed efficacy in murine disease models to human for 11-HSD1 inhibitors may be misleading. Investigators of the effects of 11-HSD1 inhibitors should confirm that desired levels of enzyme inhibition in AT can be maintained over time after repeat dosing and not rely on results following a single dose.
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