Uptake and retention of moulting hormones by the integument of crayfish in vitro. III. The possible involvement of Na+/K+-ATPase.

ABSTRACT

The specific uptake of the ecdysteroid [3H]ponasterone A into crayfish hypodermis in vitro is inhibited by increasing concentrations of potassium in the medium. The Na+/K+-ATPase blocker ouabain also decreases uptake of the ecdysteroid. Maximal inhibition of uptake is reached at 5 X 10(-5) M ouabain.