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pubmed-article:11168989pubmed:abstractTextCharacterization of p-hydroxy-hippuric acid as an inhibitor of Ca2+-ATPase in end-stage renal failure. In patients with end-stage renal failure (ESRF), disturbances of Ca2+ metabolism are common. Besides hormonal changes, inhibition of cellular Ca2+-ATPase was postulated to contribute to uremic toxicity. We purified a potent inhibitor of the Ca2+-ATPase from the ultrafiltrate of patients with ESRF by multiple steps of high-performance liquid chromatography to homogeneity, and identified the isolated inhibitor by mass spectrometric methods as p-hydroxy-hippuric acid. The enzyme used for the Ca2+-ATPase assay system was isolated from red blood cells by cross-flow filtration. The activity of the Ca2+-ATPase was measured spectrophotometrically as the difference in hydrolysis of adenosine 5'-triphosphate (ATP) in the presence and absence of Ca2+ with different concentrations of ATP and p-hydroxyhippuric acid. The Ca2+-ATPase was found to be inhibited by p-hydroxy-hippuric acid at a concentration above 11.7 micromol/L. p-Hydroxyhippuric acid inhibited the erythrocyte Ca2+-ATPase by reducing Vmax and increasing the Km value. The EC50 (log mol/L; mean +/- SEM) for p-hydroxy-hippuric acid was calculated as 4.82 +/- 0.14. In conclusion, p-hydroxy-hippuric acid may play a role in disturbed Ca2+ metabolism in end-stage renal failure.lld:pubmed
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pubmed-article:11168989pubmed:paginationS84-8lld:pubmed
pubmed-article:11168989pubmed:dateRevised2010-11-18lld:pubmed
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pubmed-article:11168989pubmed:articleTitleCharacterization of p-hydroxy-hippuric acid as an inhibitor of Ca2+-ATPase in end-stage renal failure.lld:pubmed
pubmed-article:11168989pubmed:affiliationMedizinische Klinik I, Universitäst-Klinik Marienhospital, Ruhr-Universität Bochum, Herne, Germany.lld:pubmed
pubmed-article:11168989pubmed:publicationTypeJournal Articlelld:pubmed
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