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- W2078820486 abstract "The degradation of nucleotides is catalyzed by the family of enzymes called nucleoside triphosphate diphosphohydrolases (NTPDases). The aim of this work was to demonstrate the presence of NTPDase in the rat gastric mucosa. The enzyme was found to hydrolyze ATP and ADP at an optimum pH of 8.0 in the presence of Mg2+ and Ca2+. The inhibitors ouabain (0.01-1 mM), N-ethylmaleimide (0.01-4 mM), levamisole (0.10-0.2 mM) and Ap5A (0.03 mM) had no effect on NTPDase 1 activity. Sodium azide (0.03-30 mM), at high concentrations (>0.1 mM), caused a parallel hydrolysis inhibition of ATP and ADP. Suramin (50-300 microM) inhibited ATP and ADP hydrolysis at all concentrations tested. Orthovanadate slightly inhibited (15%) Mg2+ and Ca2+ ATP/ADPase at 100 microM. Lanthanum decreased Mg2+ and Ca2+ ATP/ADPase activities. The presence of NTPDase as ecto-enzyme in the gastric mucosa may have an important role in the extracellular metabolism of nucleotides, suggesting that this enzyme plays a role in the control of acid and pepsin secretion, mucus production, and contractility of the stomach." @default.
- W2078820486 created "2016-06-24" @default.
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- W2078820486 date "2005-07-01" @default.
- W2078820486 modified "2023-09-26" @default.
- W2078820486 title "Characterization of ATP and ADP hydrolysis activity in rat gastric mucosa" @default.
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- W2078820486 doi "https://doi.org/10.1016/j.cellbi.2005.03.010" @default.
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