Optimization of Metabolic and Renal Clearance in a Series of Indole Acid Direct Activators of 5'-Adenosine Monophosphate-Activated Protein Kinase (AMPK)

J Med Chem. 2018 Mar 22;61(6):2372-2383. doi: 10.1021/acs.jmedchem.7b01641. Epub 2018 Feb 28.

Abstract

Optimization of the pharmacokinetic (PK) properties of a series of activators of adenosine monophosphate-activated protein kinase (AMPK) is described. Derivatives of the previously described 5-aryl-indole-3-carboxylic acid clinical candidate (1) were examined with the goal of reducing glucuronidation rate and minimizing renal excretion. Compounds 10 (PF-06679142) and 14 (PF-06685249) exhibited robust activation of AMPK in rat kidneys as well as desirable oral absorption, low plasma clearance, and negligible renal clearance in preclinical species. A correlation of in vivo renal clearance in rats with in vitro uptake by human and rat renal organic anion transporters (human OAT/rat Oat) was identified. Variation of polar functional groups was critical to mitigate active renal clearance mediated by the Oat3 transporter. Modification of either the 6-chloroindole core to a 4,6-difluoroindole or the 5-phenyl substituent to a substituted 5-(3-pyridyl) group provided improved metabolic stability while minimizing propensity for active transport by OAT3.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • AMP-Activated Protein Kinases / drug effects*
  • Animals
  • Enzyme Activation / drug effects
  • Enzyme Activators / chemical synthesis*
  • Enzyme Activators / pharmacokinetics
  • Enzyme Activators / pharmacology*
  • Humans
  • Indoles / chemical synthesis*
  • Indoles / pharmacokinetics
  • Indoles / pharmacology*
  • Intestinal Absorption
  • Kidney / drug effects
  • Kidney / enzymology
  • Male
  • Models, Molecular
  • Organic Anion Transporters, Sodium-Independent / metabolism
  • Rats
  • Rats, Wistar
  • Structure-Activity Relationship

Substances

  • Enzyme Activators
  • Indoles
  • Organic Anion Transporters, Sodium-Independent
  • organic anion transport protein 3
  • AMP-Activated Protein Kinases