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Effect of gallic acid on alkaline phosphatase and peptidase activities in rat intestine.
Indian J Biochem Biophys ; 2009 Oct; 46(5): 378-382
Article in English | IMSEAR | ID: sea-135220
ABSTRACT
Gallic acid is a normal constituent of many edible foods, thus directly interacts with epithelial tissue in intestine. In the present study, the effect of gallic acid on intestinal alkaline phosphatase (IAP) and peptidase activities in rat intestine was evaluated. Gallic acid (0.27-0.5 mM) inhibited activities of leucine aminopeptidase (LAP) and -glutamyl transpeptidase (-GTP) by over 90%, compared to controls in rat intestine. In contrast, 0.1-0.6 mM gallic acid either had no effect or stimulated the activity of IAP in rat intestine. The observed inhibition of peptidases by gallic acid was reversible in nature. Kinetic analysis revealed no change in Vmax of LAP (0.42-0.44 units/mg protein) and -GTP (0.22-0.24 units/mg protein), while the values of apparent Km were increased 6-7 fold, exhibiting competitive-type of enzyme inhibition by gallic acid. The values of Ki for LAP and -GTP were 0.037 mM and 0.017 mM, respectively. These observations indicate that gallic acid is a potent inhibitor of brush border peptidases, and thus may interfere in the digestion and absorption of proteins in the intestine.
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Full text: Available Index: IMSEAR (South-East Asia) Main subject: Rats / Male / Kinetics / Rats, Wistar / Dose-Response Relationship, Drug / Alkaline Phosphatase / Enzyme Inhibitors / Gallic Acid / Gamma-Glutamyltransferase / Intestines Language: English Journal: Indian J Biochem Biophys Year: 2009 Type: Article

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Full text: Available Index: IMSEAR (South-East Asia) Main subject: Rats / Male / Kinetics / Rats, Wistar / Dose-Response Relationship, Drug / Alkaline Phosphatase / Enzyme Inhibitors / Gallic Acid / Gamma-Glutamyltransferase / Intestines Language: English Journal: Indian J Biochem Biophys Year: 2009 Type: Article