Identification and biochemical studies on novel non-nucleoside inhibitors of the enzyme adenosine kinase.

Published

Journal Article

The enzyme adenosine kinase (AK) plays a key role in the regulation of intracellular and extracellular concentration of adenosine (Ado), which exhibits potent hormonal activity in cardiovascular, nervous and immune systems. In view of the pharmacological effects of Ado, there is much interest in identifying inhibitors of AK, which can augment its tissue-protective effects. In this study, we have screened 1040 compounds from a chemical library of putative kinase inhibitors for their effect on purified human recombinant AK. These studies have identified 8 novel, non-nucleoside AK inhibitors. Four of these compounds (viz. 2-tert-butyl-4H-benzo[1,2,4]thiadiazine-3-thione (2759-0749); N-(5,6-diphenyl-furo[2,3-d]pyrimidin-4-yl)-propionamide (3998-0118); 3-[5,6-Bis-(4-methoxy-phenyl)-furo[2,3-d]pyrimidin-4-ylamino]-propan-1-ol (4072-2732); and 2-[2-(3,4-dihydroxy-phenyl)-5-phenyl-1H-imidazol-4-yl]-fluoren-9-one (8008-6198)), which inhibited human AK in a concentration-dependent manner in a low micromolar range (IC(50) = 0.38 approximately 1.98 microM) were further studied. Kinetic and structural studies on these compounds provide evidence that inhibition of AK by these compounds was competitive with respect to Ado and non-competitive for ATP. All of these compounds also inhibited uptake of Ado and its metabolism in cultured mammalian cells at comparable concentrations indicating their efficient cellular penetrability. These AK inhibitors, whose chemical structures differ significantly from all previously known inhibitors, provide useful lead compounds for identification of more potent but less toxic AK inhibitors that may prove useful for therapeutic purposes.

Full Text

Duke Authors

Cited Authors

  • Park, J; Vaidyanathan, G; Singh, B; Gupta, RS

Published Date

  • April 2007

Published In

Volume / Issue

  • 26 / 3

Start / End Page

  • 203 - 212

PubMed ID

  • 17205396

Pubmed Central ID

  • 17205396

Electronic International Standard Serial Number (EISSN)

  • 1875-8355

International Standard Serial Number (ISSN)

  • 1572-3887

Digital Object Identifier (DOI)

  • 10.1007/s10930-006-9062-z

Language

  • eng