Linked Life Data

10742290

Source:http://linkedlifedata.com/resource/pubmed/id/10742290

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pubmed-article:10742290pubmed:abstractText1. Tyrosine kinases have been proposed as regulators of voltage-operated calcium channels. The effects of a range of structurally different inhibitors of protein tyrosine kinases (PTK) were examined on voltage-operated calcium channel currents (I(Ba)) and pp60(c-src) kinase (c-src) activity in vitro. 2. I(Ba) was measured in single myocytes isolated from rabbit ear artery by conventional whole cell voltage-clamp techniques. The activity of purified human c-src was measured in vitro using a non-radioactive assay. 3. Bath application of tyrphostin-23 and genistein (non-selective PTK inhibitors), bistyrphostin (a receptor-PTK-selective inhibitor) and PP1 (a src family-selective inhibitor) inhibited I(Ba) in a concentration-dependent manner over a range of test membrane potentials. Intracellular application of peptide-A, a peptide inhibitor of c-src also inhibited currents. Inhibitor potency series against I(Ba) was PP1 > genistein > tyrphostin 23 > bistyrphostin. 4. Tyrphostin-23, genistein, PP1, and peptide-A shifted the steady-state inactivation curves in a hyperpolarized direction without altering their slope. The inhibitors had no significant effects on I(Ba) activation calculated from current-voltage relationships. 5. The agents inhibited c-src activity in a concentration-dependent manner. The order of potency was PP1 > genistein > peptide-A > tyrphostin-23 > bistyrphostin. The IC(50) for inhibition of c-src activity was similar to the IC(50) for inhibition of I(Ba) in all cases. 6. Western blot analysis with a specific antibody to c-src showed the presence of this cytoplasmic tyrosine kinase in rabbit ear artery cells. 7. A range of structurally dissimilar inhibitors of PTKs inhibit I(Ba) and c-src activity with similar potency. These data provide further evidence implicating endogenous c-src in the modulation of L-type calcium channels in vascular smooth muscle cells.lld:pubmed
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pubmed-article:10742290pubmed:authorpubmed-author:HughesA DADlld:pubmed
pubmed-article:10742290pubmed:authorpubmed-author:WijetungeSSlld:pubmed
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pubmed-article:10742290pubmed:articleTitleEffects of protein tyrosine kinase inhibitors on voltage-operated calcium channel currents in vascular smooth muscle cells and pp60(c-src) kinase activity.lld:pubmed
pubmed-article:10742290pubmed:affiliationImperial College School of Medicine, National Heart & Lung Institute, St Mary's Hospital, London W2 1NY, UK. v.wijetunge@ic.ac.uklld:pubmed
pubmed-article:10742290pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10742290pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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