Fig. 3.

Organic cations and sucrose inhibit cAMP efflux. A and B, inhibition of cAMP efflux in normal (A) and immortalized (B) pituitary cells by complete replacement of bath Na⁺ with NMDG, TMA, and choline. C, inhibition of cAMP efflux in pituitary cells by complete (270 mM sucrose) or partial (75 mM Na⁺ and 120 mM sucrose) replacement of bath Na⁺ with sucrose. Mean ± S.E.M. values are shown in Table 1.