Archiv der Pharmazie p. 371 - 376 (1996)
Update date:2022-08-05
Topics: Potent
Zimmermann, Juerg
Caravatti, Giorgio
Mett, Helmut
Meyer, Thomas
Mueller, Marcel
Lydon, Nicholas B.
Fabbro, Doriano
Phenylamino-pyrimidines represent a novel class of inhibitors of the protein kinase C with a high degree of selectivity versus other serine/threonine and tyrosine kinases. Steady state kinetic analysis of N-(3-[1-imidazolyl]-phenyl)-4-(3-pyridyl)-2-pyrimidinamine (5), which showed potent inhibitory activity, revealed competitive kinetics relative to ATP. The adjacent H-bond acceptor of the pyrimidine moiety next to an H-bond donor of the phenylamine was found to be crucial for inhibitory activity. N-(3-Nitro-phenyl)-4-(3-pyridyl)-2-pyrimidinamine (7) preferentially inhibited PKC-α (IC50 = 0.79 μM) and not the other subtypes tested. The inhibition constants of PKC-α and the antiproliferative effect on T24 human bladder carcinoma cells showed a qualitative correlation, although with some exceptions.
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