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- W2040359684 abstract "Enteropathogenic Escherichia coli (EPEC) triggers a large release of adenosine triphosphate (ATP) from host intestinal cells and the extracellular ATP is broken down to adenosine diphosphate (ADP), AMP, and adenosine. Adenosine is a potent secretagogue in the small and large intestine. We suspected that ecto-5'-nucleotidase (CD73, an intestinal enzyme) was a critical enzyme involved in the conversion of AMP to adenosine and in the pathogenesis of EPEC diarrhea. We developed a nonradioactive method for measuring ecto-5'-nucleotidase in cultured T84 cell monolayers based on the detection of phosphate release from 5'-AMP. EPEC infection triggered a release of ecto-5'-nucleotidase from the cell surface into the supernatant medium. EPEC-induced 5'-nucleotidase release was not correlated with host cell death but instead with activation of phosphatidylinositol-specific phospholipase C (PI-PLC). Ecto-5'-nucleotidase was susceptible to inhibition by zinc acetate and by alpha,beta-methylene-adenosine diphosphate (alpha,beta-methylene-ADP). In the Ussing chamber, these inhibitors could reverse the chloride secretory responses triggered by 5'-AMP. In addition, alpha,beta-methylene-ADP and zinc blocked the ability of 5'-AMP to stimulate EPEC growth under nutrient-limited conditions in vitro. Ecto-5'-nucleotidase appears to be the major enzyme responsible for generation of adenosine from adenine nucleotides in the T84 cell line, and inhibitors of ecto-5'-nucleotidase, such as alpha,beta-methylene-ADP and zinc, might be useful for treatment of the watery diarrhea produced by EPEC infection." @default.
- W2040359684 created "2016-06-24" @default.
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- W2040359684 date "2007-05-17" @default.
- W2040359684 modified "2023-09-27" @default.
- W2040359684 title "Ecto-5′-nucleotidase and intestinal ion secretion by enteropathogenic Escherichia coli" @default.
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- W2040359684 doi "https://doi.org/10.1007/s11302-007-9056-0" @default.
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