Abstract
cAMP levels in Paramecium increased dose dependently after a step increase of [Ca] or [Sr] in the incubation, provided K was present. Two mM Ca or Sr tripled cAMP concentrations within 3 s and induced an increase in forward swimming speed. The increase in cAMP formation was strictly dependent on the Donnan ratio ▪ Na, Li, or tetraethylammonium could not replace K. The data provide evidence for regulation of cAMP in Paramecium by the membrane surface charge as determined specifically by the K:Ca ratio.
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