Unstirred Water Layers and the Kinetics of Organic Cation Transport

Pharmaceutical Research
Takahiro ShibayamaStephen H Wright

Abstract

Unstirred water layers (UWLs) present an unavoidable complication to the measurement of transport kinetics in cultured cells, and the high rates of transport achieved by overexpressing heterologous transporters exacerbate the UWL effect. This study examined the correlation between measured Jmax and Kt values and the effect of manipulating UWL thickness or transport Jmax on the accuracy of experimentally determined kinetics of the multidrug transporters, OCT2 and MATE1. Transport of TEA and MPP was measured in CHO cells that stably expressed human OCT2 or MATE1. UWL thickness was manipulated by vigorous reciprocal shaking. Several methods were used to manipulate maximal transport rates. Vigorous stirring stimulated uptake of OCT2-mediated transport by decreasing apparent Kt (Ktapp) values. Systematic reduction in transport rates was correlated with reduction in Ktapp values. The slope of these relationships indicated a 1500 μm UWL in multiwell plates. Reducing the influence of UWLs (by decreasing either their thickness or the Jmax of substrate transport) reduced Ktapp by 2-fold to >10-fold. Failure to take into account the presence of UWLs in experiments using cultured cells to measure transport kinetics can result in significan...Continue Reading

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Citations

Aug 9, 2016·European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences·Chrysa Daousani, Panos Macheras
Oct 27, 2016·F1000Research·Bruno Stieger, Bruno Hagenbuch
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Jan 11, 2018·Drug Metabolism and Disposition : the Biological Fate of Chemicals·Aqsaa ChaudhryJoe Bentz
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Jul 3, 2019·International Journal of Molecular Sciences·Cheng-Ting ChiMax K Leong
Dec 28, 2018·Environmental Science & Technology·Elisabeth D ChangNic R Bury

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