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. 2019 Sep 19;9:13555. doi: 10.1038/s41598-019-49929-w

Figure 4.

Figure 4

Time course of [3H]2-chloroadenosine uptake by PK15-NTD and PK15-hENT4 cells. Cells were incubated at ~22 °C for the specified times with 30 µM [3H]2-chloroadenosine in either pH 7.5 or pH 6.0 buffer in the presence and absence of the indicated inhibitors (Panel a: PK15-NTD ± 10 µM D22, an established hENT4 inhibitor; Panel b: PK15-NTD ± 10 mM adenine; Panel c: PK15-hENT4 ± 50 nM ABT-702, an adenosine kinase inhibitor; Panel d: PK15-hENT4 cells ± 10 mM adenine in the presence of ABT-702. Each point represents the mean ± S.E.M. from 5 experiments conducted in duplicate, and one-phase association curves were fitted to the data as shown. *Denotes a significant difference in uptake in the presence of the modifier (D22, ABT-702, or adenine) versus its absence at the respective pH (Two way ANOVA with Tukey’s multiple comparison test, P < 0.05).