Stimulation by P2X7 receptors of calcium-dependent production of reactive oxygen species (ROS) in rat submandibular glands |
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Authors: | U Fontanils M Seil S Pochet M El Ouaaliti M Garcia-Marcos JP Dehaye A Marino |
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Institution: | 1. Departamento de Bioquimica y Biologia Molecular, Facultad de Ciencias, Universidad del Pais Vasco, 48080 Bilbao, Spain;2. Laboratoire de Chimie biologique et médicale et de Microbiologie pharmaceutique, Institut de Pharmacie, Université libre de Bruxelles, Brussels, Belgium;3. Laboratoire de Physiologie et de Pharmacologie, Institut de Pharmacie, Université libre de Bruxelles, Brussels, Belgium |
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Abstract: | BackgroundAgonists of P2X7 receptors increase the production of reactive oxygen species (ROS) in immunocytes. In this work we tested this response and its effect on mitochondrial inner membrane potential (Δψm) in exocrine glands.MethodsThe production of ROS by rat submandibular glands was investigated by measuring the oxidation of dichlorodihydrofluorescein (DCFH), a fluorescent probe. The Δψm was estimated with tetramethylrhodamine.ResultsActivation of P2X7 receptors by ATP or Bz-ATP increased the production of ROS. This response was not modified by inhibitors of phospholipase A2 or of various kinases. The effect of ATP was calcium-dependent and was blocked by diphenyliodonium, an inhibitor of flavoproteins. It was not affected by rotenone, an inhibitor of the complex I of the mitochondrial electron transfer chain. Scavengers of ROS had no effect on the dissipation of Δψm by ATP.ConclusionsWe conclude that, in rat submandibular glands, P2X7 receptors stimulate in a calcium-dependent manner an oxidase generating ROS, suggesting the involvement of the dual oxidase Duox2. The production of ROS does not contribute to the depolarization of mitochondria by purinergic agonists.General significancePurinergic receptors could be regulators of the bactericidal properties of saliva by promoting both the secretion of peroxidase from acinar cells and by activating Duox2. |
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Keywords: | NADPH oxidase Submandibular glands purinergic receptors Carbachol |
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