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cAMP and β-adrenergic stimulation of rat alveolar epithelium

Effects on fluid absorption and paracellular permeability

  • Transport Processes, Metabolism and Endocrinology; Kidney, Gastrointestinal Tract, and Exocrine Glands
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Abstract

The absorption of fluid (bicarbonate-buffered Ringer with 10 mmol/l glucose) instilled into rat lung is a Na+-coupled process that takes place through two apical transport systems: an amiloride-sensitive Na+ transport and a Na+-glucose co-transport [5]. Fluid absorption in isolated, perfused rat lungs and the permeability to3H-mannitol of alveolar epithelium were studied in control conditions and during stimulation of the alveolar epithelium by cAMP or isoproterenol. cAMP led to a threefold increase in the rate of fluid absorption and to an increase in the paracellular permeability. A similar response was found following \-adrenergic stimulation obtained with isoproterenol in the perfusate. The increase in fluid transport was due to enhancement of the amiloride-sensitive component of Na+ transport. The Na+-glucose co-transport which accounts for about 60% of fluid absorption in control conditions was depressed, possibly as a consequence of a depolarization of the apical alveolar cell membrane. Fluid absorption was reduced by 40% by apical amiloride (10−4 mol/l) in control lungs and to an even larger extent in isoproterenol-stimulated lungs; it was completely abolished by amiloride in cAMP stimulated lungs. Since the Na+-glucose co-transport was still operative, this suggests that a secretory process was triggered. This was confirmed in experiments in which both kinds of transport were inhibited with a combination of amiloride and glucose-free Ringer. In these conditions fluid balance was zero in unstimulated lungs whilst fluid entry into alveoli was observed in isoproterenol and cAMP stimulated lungs.

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Authors and Affiliations

  1. Faculté Xavier-Bichat, Inserm U82 and Département de Physiologie, F-75018, Paris, France

    Georges Saumon, Guy Basset, Francine Bouchonnet & Christian Crone

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  1. Georges Saumon
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  2. Guy Basset
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  3. Francine Bouchonnet
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  4. Christian Crone
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Saumon, G., Basset, G., Bouchonnet, F. et al. cAMP and β-adrenergic stimulation of rat alveolar epithelium. Pflugers Arch. 410, 464–470 (1987). https://doi.org/10.1007/BF00586526

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  • DOI: https://doi.org/10.1007/BF00586526

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