Abstract
The inhibitory effect of gallic acid (3,4,5-trihydroxybenzoic acid), and its ester derivatives methyl, propyl, octyl and lauryl has been tested on the tyrosine kinase activity of affinity purified c-Src from human platelets, using the artificial substrate Poly (Glu,Na,Tyr) 4:1. When tested as inhibitor of the autophosphorylation of the enzyme and the phosphorylation of the protein tyrosine phosphatase SHP-1 by c-Src, lauryl gallate was found to be a more potent inhibitor than other widely used protein tyrosine kinase (PTK) inhibitors such as genistein and herbimycin A. However, lauryl gallate did not inhibit the activity of the serine threonine kinases protein kinase A (PKA) and casein kinase II (CKII) from rat brain.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Blood Platelets / drug effects
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Blood Platelets / enzymology*
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CSK Tyrosine-Protein Kinase
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Casein Kinase II
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Cyclic AMP-Dependent Protein Kinases / metabolism
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Gallic Acid / analogs & derivatives*
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Gallic Acid / pharmacology*
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Humans
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Intracellular Signaling Peptides and Proteins
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Phosphorylation
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Protein Serine-Threonine Kinases / metabolism
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Protein Tyrosine Phosphatase, Non-Receptor Type 6
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Protein Tyrosine Phosphatases / metabolism
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Protein-Tyrosine Kinases / antagonists & inhibitors*
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Protein-Tyrosine Kinases / isolation & purification
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Rats
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Rats, Sprague-Dawley
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src-Family Kinases
Substances
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Intracellular Signaling Peptides and Proteins
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lauryl gallate
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Gallic Acid
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Protein-Tyrosine Kinases
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CSK Tyrosine-Protein Kinase
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src-Family Kinases
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CSK protein, human
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Casein Kinase II
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Protein Serine-Threonine Kinases
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Cyclic AMP-Dependent Protein Kinases
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PTPN6 protein, human
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Protein Tyrosine Phosphatase, Non-Receptor Type 6
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Protein Tyrosine Phosphatases
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Ptpn6 protein, rat