Abstract
In a preliminary study we reported a significant enhancement of Ca 2+ ATPase activity in sickle cell membranes in the presence of progesterone and testosterone. In this work the reactivity of various classes of steroid hormones with the membranes of hemoglobin variants was investigated. A consistent universal stimulation of Ca 2+ ATPase activity in sickle cell membranes by the different classes of steroid hormones does not appear to correlate with any major structural differences of the hormones or the presence of reactive functional groups. The universal interaction of the hormones with sickle cell membranes probably enhances Ca 2+ efflux through the Ca 2+ ATPase without directly affecting the characteristics of the pump.
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