title: Tyrphostins. 3. Structure-activity relationship studies of alpha-substituted benzylidenemalononitrile 5-S-aryltyrphostins.
abstract: In this study we describe an extension of our previous studies on cis-benzylidenemalononitrile tyrphostins. We have introduced S-aryl substituents in the 5 position (meta vis-a-vis the malononitrile moiety). We find that these compounds are potent blockers of EGFR kinase and its homolog HER-2 kinase. Interestingly, we find that certain S-aryltryphostins discriminate between EGFR and HER-2 kinase in favor of the HER-2 kinase domain by almost 2 orders of magnitude. When examined in intact cells it was found that these selective S-aryltrphostins are equipotent in inhibiting EGF dependent proliferation of NIH 3T3 harboring either the EGF receptor or the chimera EGF/neu (HER1-2). These findings suggest that the antiproliferative activity of these tyrphostins is mainly due to the inhibition of a mitogenic signaling element downstream to the growth receptor kinase.
authors.affiliation: Department of Biological Chemistry, Alexander Silberman Institute of Life Sciences, Hebrew University of Jerusalem, Israel.
authors.forename: A
authors.initials: A
authors.lastname: Gazit
authors.forename: N
authors.initials: N
authors.lastname: Osherov
authors.forename: I
authors.initials: I
authors.lastname: Posner
authors.forename: A
authors.initials: A
authors.lastname: Bar-Sinai
authors.forename: C
authors.initials: C
authors.lastname: Gilon
authors.forename: A
authors.initials: A
authors.lastname: Levitzki
mesh_terms: D016475:3T3 Cells; D000818:Animals; D001597:Benzylidene Compounds / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D001665:Binding Sites; D002455:Cell Division / Q000187:drug effects; D004247:DNA / Q000096:biosynthesis; D004815:Epidermal Growth Factor / Q000494:pharmacology; D066246:ErbB Receptors / Q000037:antagonists & inhibitors / Q000378:metabolism; D051379:Mice; D015394:Molecular Structure; D010766:Phosphorylation; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors; D011518:Proto-Oncogene Proteins / Q000037:antagonists & inhibitors; D018719:Erb-b2 Receptor Tyrosine Kinases; D013329:Structure-Activity Relationship
chemical_list: D001597:Benzylidene Compounds; D004247:DNA; D004815:Epidermal Growth Factor; D066246:ErbB Receptors; D011505:Protein-Tyrosine Kinases; D011518:Proto-Oncogene Proteins; D018719:Erb-b2 Receptor Tyrosine Kinases