Abstract
Vasoactive intestinal peptide (VIP) was found to cause a dose-dependent decrease in fructose 2,6-bisphosphatase concomitant with an increase in cyclic AMP in cultured HT29 cancer cells from human colon. The maximum effect was a 41% decrease obtained with 10 nM-VIP, and half-maximum effect was obtained with 0.75 nM-VIP. The effect of 2.5 nM-VIP was almost totally counteracted (i.e. fructose 2,6-bisphosphate concentration was restored) by either adrenaline (1 microM) or the alpha 2-adrenergic agonist UK-14304 (1 microM); the alpha 2-agonist clonidine (1 microM) was less efficient, since the VIP effect was decreased by 72% only. The adrenaline effect was totally antagonized by 1 microM-yohimbine. It is concluded that, in the HT29 cancer cells, the fructose 2,6-bisphosphate-producing system is sensitive to variations of cyclic AMP concentration and is under the dual control of VIP and alpha 2-adrenergic receptors.
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