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ACTH stimulates fructose 2,6-bisphosphate synthesis and glycolysis in Y-1 adrenal tumor cells.

The effect of ACTH on glycolysis has been studied in Y-1 tumor adrenal cells. ACTH caused a sustained increase in the liberation of lactate as well as a stimulation of both basal and glucose-induced fructose 2,6-bisphosphate content. ACTH produces changes also in the activities of phosphofructokinase-1 and phosphofructokinase-2. The addition of Ca2+ or dibutyryl cyclic AMP did not modify neither lactate production nor fructose 2,6-bisphosphate levels. The results suggest that fructose 2,6-bisphosphate regulates ACTH-induced glycolysis at the phosphofructokinase-1 step, although the biochemical mechanism of phosphofructokinase-2 activation remains elusive.