Table 1.

Kinetic parameters of Na-K-ATPase transporters in IEC-18 cells.

	0 Day	1 Day	2 Day	3 Day	4 Day
Vmax (picomole/mg protein·30 S)	742.5 ± 62	714 ± 83.5	718 ± 58.4	713 ± 27.9	733 ± 44.8
Km (mM)	0.68 ± 0.11a	0.61 ± 0.15a	0.39 ± 0.08b	0.37 ± 0.04b	0.33 ± 0.06b

Uptake of ⁸⁶Rb⁺ as a function of varying concentration of extracellular Rb⁺ (RbCl). As extracellular Rb⁺ concentration was increased, uptake of ⁸⁶Rb⁺ was stimulated and subsequently became saturated in all groups. Kinetic parameters [maximal uptake (V_max) and affinity (1/K_m)] were obtained after the analysis of data with GraphPad Prism 7 software (GraphPad Software Inc., San Diego, CA, USA). Values are represented as mean ± SEM, n = 6. Values not sharing common superscripted letters are significantly different at p < 0.01.