Activation of phosphatidylinositol turnover by neurotensin receptors in the human colonic adenocarcinoma cell line HT29 |
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Affiliation: | Centre de Biochimie du Centre National de la Recherche Scientifique, Faculté des Sciences, Parc Valrose, 06034 Nice Cedex, France |
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Abstract: | Association of neurotensin to its receptor in HT29 cells increases the intracellular concentration of inositol phosphates. A rapid (20–30 s), transient stimulation of inositol trisphosphate (275% of the basal level) and inositol bisphosphate (420%) is first observed, followed by a slower, stable increase in inositol monophosphate (170%). Half-maximal stimulation of the three inositol phosphates was obtained with 50–100 nM neurotensin. These results indicate that neurotensin is able to regulate intracellular Ca2+ levels in HT29 cells by using inositol trisphosphate as a second messenger. |
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