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• W2001122572 abstract "The effects of the microtubule stabilizing agent, deuterium oxide, on in vitro rat antral gastrin release were examined under basal conditions and during stimulation with isobutyl methylxanthine and bombesin plus isobutyl methylxanthine. Basal gastrin release from antral mucosal fragments was unaffected by increasing media concentration of deuterium oxide (12.5 to 75% v/v) during 1 h incubations. Gastrin release stimulated by isobutyl methylxanthine (0.1 mM), a potent inhibitor of phosphodiesterase activity, was inhibited completely by 12.5% deuterium oxide. Bombesin (1 X 10(-8) M) in the presence of IBMX (0.1 mM) stimulated gastrin release (29.7 +/- 1.9% of total gastrin). This was significantly greater than gastrin released under control conditions and with IBMX alone: 12.0 +/- 1.1 (P less than 0.001) and 20.2 +/- 2.6% of total gastrin (P less than 0.02), respectively. Partial inhibition of bombesin-IBMX stimulated gastrin release was achieved with 12.5% and 25% deuterium oxide and stimulation of gastrin release was inhibited completely by 50% deuterium oxide. In contrast to these results, gastrin release stimulated by the calcium ionophore A23187 was not inhibited by 50% deuterium oxide. Additional studies were performed to assess reversibility of the effects of deuterium oxide on stimulated gastrin release. Antral tissue exposed to initial culture medium containing deuterium oxide (50%) and bombesin-IBMX for 60 min was exchanged for medium without deuterium oxide. Restimulation of antral tissue during the second hour of culture resulted in gastrin release that was comparable to that observed in cultures not exposed to deuterium oxide during the first hour of culture. Reversibility of the effects of deuterium oxide suggest that a functional alteration in microtubular function is restored by removal of heavy water from the culture medium. Results of these experiments indicate that deuterium oxide is capable of inhibiting gastrin release stimulated by the peptide hormone bombesin and by the phosphodiesterase inhibitor isobutyl methylxanthine. Furthermore, these results suggest that increased levels of intracellular calcium achieved by the action of ionophore A23187 prevent microtubular stabilization by deuterium oxide." @default.
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• W2001122572 title "Effect of deuterium oxide on gastrin release from rat antral mucosal fragments" @default.
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• W2001122572 doi "https://doi.org/10.1016/0167-0115(83)90308-7" @default.
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