Fig. 4. PGE2 exerts a dose-dependent effect on the Na⁺/K⁺ ATPase activity. (A) Dose response study on the effect of exogenous PGE2 (0, 0.1, 1, 10,100,200, and 300 nM) added for 2 hours on the Na⁺/K⁺ ATPase activity. (B) Effect of exogenous PGE2 (100nM; 2hours) on the activity of the Na⁺/K⁺ ATPase. Values are means ± SEM of at least 3 observations. Bars not sharing a common letter are considered significantly different from each other at p< 0.01.