Summary
A method for the visualization of the ecto-nucleotidase enzyme activities present on the cell surface, employing 141Ce3+ as a capturing and labelling agent, is described. Phosphate ions precipitated at the cell surface can be detected by coating the cells with an autoradiographic emulsion, followed by light microscopical inspection of the formed silver grains. The activities of ecto-ATPase, ecto-ADPase and 5′-nucleotidase were detected by this approach in four different cell lines. Parallel biochemical measurements of the activities of the corresponding enzymes were carried out in order to validate, evaluate, and optimize the cytochemical detection. The finding that Ce3+ ions are inhibitory to ecto-ATPase provided evidence for the necessity of carefully establishing appropriate reaction conditions for the cytochemical determination of ecto-nucleotidases. The application of this method to the indirect detection of extracellular adenosine production from substrates like ATP has also been documented. It allows a cytochemical determination of adenosine formed through cascade nucleotide dephosphorylation. This newly described method is of high sensitivity and potentially of value for a variety of applications, including not only cytochemistry but also cell biology, and molecular biology studies.
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Culic, O., Lemmens, R., Teuchy, H. et al. Autoradiography-based cytochemical detection of ecto-ATPase, ecto-ADPase, 5′-nucleotidase, and extracellular adenosine production, employing 141Ce3+ as a capturing agent. Histochem J 27, 555–564 (1995). https://doi.org/10.1007/BF00174328
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DOI: https://doi.org/10.1007/BF00174328