Xanthine oxidase/dehydrogenase is present in human placenta.


Xanthine dehydrogenase/oxidase (XDH, EC, XO, EC produces uric acid, and in the oxidase form also generates the free radical superoxide. Previous reports failed to demonstrate XDH/XO activity in human placenta. Our objective was to determine evidence of XDH/XO in human placenta. We developed a cDNA probe for human XDH/XO and used it to detect mRNA by Northern hybridization. Immunohistochemical localization of the enzyme in placental tissue was performed using a specific antibody for XDH/XO and ABC-peroxidase. Enzyme activity assay was determined by the conversion of [14C] xanthine to [14C] uric acid. mRNA was detected in all placental samples (n = 4). Villous and non-villous trophoblast cells expressed immunohistochemical staining for XOD (n = 4). Enzyme activity was detected in all placentae (n = 6). Despite previous reports, we found mRNA, XDH/XO protein and enzyme activity in human placenta localized to trophoblast cells. Enzyme activity was much lower than in liver. Several conditions in the maternal-fetal unit could potentially increase XDH/XO activity and conversion of the enzyme to its oxidase form.


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@article{Many1996XanthineOI, title={Xanthine oxidase/dehydrogenase is present in human placenta.}, author={Angela Many and A Westerhausen-Larson and Amal Kanbour-Shakir and James M. Roberts}, journal={Placenta}, year={1996}, volume={17 5-6}, pages={361-5} }