Abstract
Prior studies have shown that ouabain, a cardiac glycoside that inhibits the sodium, potassium adenosine triphosphatase (Na+,K+ ATPase) enzyme, downregulates phytohemagglutinin (PHA)-induced peripheral blood mononuclear cell (PBMNC) proliferation. This study examined and compared the effects of both ouabain and digoxin, a cardiac glycoside used therapeutically in humans, on PBMNC proliferation. Peripheral blood mononuclear cells were isolated from healthy human subjects, incubated for 72 hours with and without PHA (2%) in the presence and absence of ouabain (10(-12) M to 10(-4) M) or digoxin (10(-9) M to 10(-6) M), and pulsed with 3H thymidine. For PHA-stimulated PBMNCs in the ouabain-treated group (n = 10 subjects), the mean (+/-STD) % uptake (% 3H thymidine uptake in absence of ouabain) was 80.5 +/- 6.0 at 10(-12) M ouabain, 73.1 +/- 8.4 at 10(-10) M, 47.89 +/- 13.1 at 10(-8) M, 6.9 +/- 3.2 at 10(-6) M, and 3.4 +/- 1.6 at 10(-4) M. For PHA-stimulated cells in the digoxin-treated group (n = 9 subjects), the mean (+/-STD) % uptake (% 3H thymidine uptake in absence of digoxin) was 89.8 +/- 9.8 at 10(-9) M digoxin, 92.6 +/- 8.2 at 10(-8) M, 54.3 +/- 19.8 at 10(-7) M, and 1.0 +/- 2.4 at 10(-6) M. Repeated measures ANOVA demonstrat...Continue Reading
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